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914d1ec171eb0e27ced472aed2d05eae19b265da
systemd/src/tmpfiles/tmpfiles.c
Yu Watanabe 914d1ec171 tmpfiles: fix output value assignment 
Fixes a bug in 7eeda1da90 (v256).
2025-02-28 23:38:02 +09:00

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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <errno.h>
#include <fcntl.h>
#include <fnmatch.h>
#include <getopt.h>
#include <limits.h>
#include <linux/fs.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdlib.h>
#include <sys/file.h>
#include <sysexits.h>
#include <time.h>
#include <unistd.h>
#include "sd-path.h"
#include "acl-util.h"
#include "alloc-util.h"
#include "bitfield.h"
#include "btrfs-util.h"
#include "build.h"
#include "capability-util.h"
#include "chase.h"
#include "chattr-util.h"
#include "conf-files.h"
#include "constants.h"
#include "copy.h"
#include "creds-util.h"
#include "devnum-util.h"
#include "dirent-util.h"
#include "dissect-image.h"
#include "env-util.h"
#include "errno-util.h"
#include "escape.h"
#include "fd-util.h"
#include "fileio.h"
#include "format-util.h"
#include "fs-util.h"
#include "glob-util.h"
#include "hexdecoct.h"
#include "io-util.h"
#include "label-util.h"
#include "log.h"
#include "macro.h"
#include "main-func.h"
#include "missing_syscall.h"
#include "mkdir-label.h"
#include "mount-util.h"
#include "mountpoint-util.h"
#include "offline-passwd.h"
#include "pager.h"
#include "parse-argument.h"
#include "parse-util.h"
#include "path-lookup.h"
#include "path-util.h"
#include "pretty-print.h"
#include "rlimit-util.h"
#include "rm-rf.h"
#include "selinux-util.h"
#include "set.h"
#include "sort-util.h"
#include "specifier.h"
#include "stat-util.h"
#include "stdio-util.h"
#include "string-table.h"
#include "string-util.h"
#include "strv.h"
#include "sysctl-util.h"
#include "terminal-util.h"
#include "umask-util.h"
#include "user-util.h"
#include "virt.h"
#include "xattr-util.h"
/* This reads all files listed in /etc/tmpfiles.d/?*.conf and creates
* them in the file system. This is intended to be used to create
* properly owned directories beneath /tmp, /var/tmp, /run, which are
* volatile and hence need to be recreated on bootup. */
typedef enum OperationMask {
OPERATION_CREATE = 1 << 0,
OPERATION_REMOVE = 1 << 1,
OPERATION_CLEAN = 1 << 2,
OPERATION_PURGE = 1 << 3,
} OperationMask;
typedef enum ItemType {
/* These ones take file names */
CREATE_FILE = 'f',
TRUNCATE_FILE = 'F', /* deprecated: use f+ */
CREATE_DIRECTORY = 'd',
TRUNCATE_DIRECTORY = 'D',
CREATE_SUBVOLUME = 'v',
CREATE_SUBVOLUME_INHERIT_QUOTA = 'q',
CREATE_SUBVOLUME_NEW_QUOTA = 'Q',
CREATE_FIFO = 'p',
CREATE_SYMLINK = 'L',
CREATE_CHAR_DEVICE = 'c',
CREATE_BLOCK_DEVICE = 'b',
COPY_FILES = 'C',
/* These ones take globs */
WRITE_FILE = 'w',
EMPTY_DIRECTORY = 'e',
SET_XATTR = 't',
RECURSIVE_SET_XATTR = 'T',
SET_ACL = 'a',
RECURSIVE_SET_ACL = 'A',
SET_ATTRIBUTE = 'h',
RECURSIVE_SET_ATTRIBUTE = 'H',
IGNORE_PATH = 'x',
IGNORE_DIRECTORY_PATH = 'X',
REMOVE_PATH = 'r',
RECURSIVE_REMOVE_PATH = 'R',
RELABEL_PATH = 'z',
RECURSIVE_RELABEL_PATH = 'Z',
ADJUST_MODE = 'm', /* legacy, 'z' is identical to this */
} ItemType;
typedef enum AgeBy {
AGE_BY_ATIME = 1 << 0,
AGE_BY_BTIME = 1 << 1,
AGE_BY_CTIME = 1 << 2,
AGE_BY_MTIME = 1 << 3,
/* All file timestamp types are checked by default. */
AGE_BY_DEFAULT_FILE = AGE_BY_ATIME | AGE_BY_BTIME | AGE_BY_CTIME | AGE_BY_MTIME,
AGE_BY_DEFAULT_DIR = AGE_BY_ATIME | AGE_BY_BTIME | AGE_BY_MTIME,
} AgeBy;
typedef struct Item {
ItemType type;
char *path;
char *argument;
void *binary_argument; /* set if binary data, in which case it takes precedence over 'argument' */
size_t binary_argument_size;
char **xattrs;
#if HAVE_ACL
acl_t acl_access;
acl_t acl_access_exec;
acl_t acl_default;
#endif
uid_t uid;
gid_t gid;
mode_t mode;
usec_t age;
AgeBy age_by_file, age_by_dir;
dev_t major_minor;
unsigned attribute_value;
unsigned attribute_mask;
bool uid_set:1;
bool gid_set:1;
bool mode_set:1;
bool uid_only_create:1;
bool gid_only_create:1;
bool mode_only_create:1;
bool age_set:1;
bool mask_perms:1;
bool attribute_set:1;
bool keep_first_level:1;
bool append_or_force:1;
bool allow_failure:1;
bool try_replace:1;
bool purge:1;
bool ignore_if_target_missing:1;
OperationMask done;
} Item;
typedef struct ItemArray {
Item *items;
size_t n_items;
struct ItemArray *parent;
Set *children;
} ItemArray;
typedef enum DirectoryType {
DIRECTORY_RUNTIME,
DIRECTORY_STATE,
DIRECTORY_CACHE,
DIRECTORY_LOGS,
_DIRECTORY_TYPE_MAX,
} DirectoryType;
typedef enum {
CREATION_NORMAL,
CREATION_EXISTING,
CREATION_FORCE,
_CREATION_MODE_MAX,
_CREATION_MODE_INVALID = -EINVAL,
} CreationMode;
static CatFlags arg_cat_flags = CAT_CONFIG_OFF;
static bool arg_dry_run = false;
static RuntimeScope arg_runtime_scope = RUNTIME_SCOPE_SYSTEM;
static OperationMask arg_operation = 0;
static bool arg_boot = false;
static bool arg_graceful = false;
static PagerFlags arg_pager_flags = 0;
static char **arg_include_prefixes = NULL;
static char **arg_exclude_prefixes = NULL;
static char *arg_root = NULL;
static char *arg_image = NULL;
static char *arg_replace = NULL;
static ImagePolicy *arg_image_policy = NULL;
#define MAX_DEPTH 256
typedef struct Context {
OrderedHashmap *items;
OrderedHashmap *globs;
Set *unix_sockets;
Hashmap *uid_cache;
Hashmap *gid_cache;
} Context;
STATIC_DESTRUCTOR_REGISTER(arg_include_prefixes, strv_freep);
STATIC_DESTRUCTOR_REGISTER(arg_exclude_prefixes, strv_freep);
STATIC_DESTRUCTOR_REGISTER(arg_root, freep);
STATIC_DESTRUCTOR_REGISTER(arg_image, freep);
STATIC_DESTRUCTOR_REGISTER(arg_image_policy, image_policy_freep);
static const char *const creation_mode_verb_table[_CREATION_MODE_MAX] = {
[CREATION_NORMAL] = "Created",
[CREATION_EXISTING] = "Found existing",
[CREATION_FORCE] = "Created replacement",
};
DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(creation_mode_verb, CreationMode);
static void context_done(Context *c) {
assert(c);
ordered_hashmap_free(c->items);
ordered_hashmap_free(c->globs);
set_free(c->unix_sockets);
hashmap_free(c->uid_cache);
hashmap_free(c->gid_cache);
}
/* Different kinds of errors that mean that information is not available in the environment. */
static bool ERRNO_IS_NEG_NOINFO(intmax_t r) {
return IN_SET(r,
-EUNATCH, /* os-release or machine-id missing */
-ENOMEDIUM, /* machine-id or another file empty */
-ENOPKG, /* machine-id is uninitialized */
-ENXIO); /* env var is unset */
}
static int specifier_directory(
char specifier,
const void *data,
const char *root,
const void *userdata,
char **ret) {
struct table_entry {
uint64_t type;
const char *suffix;
};
static const struct table_entry paths_system[] = {
[DIRECTORY_RUNTIME] = { SD_PATH_SYSTEM_RUNTIME },
[DIRECTORY_STATE] = { SD_PATH_SYSTEM_STATE_PRIVATE },
[DIRECTORY_CACHE] = { SD_PATH_SYSTEM_STATE_CACHE },
[DIRECTORY_LOGS] = { SD_PATH_SYSTEM_STATE_LOGS },
};
static const struct table_entry paths_user[] = {
[DIRECTORY_RUNTIME] = { SD_PATH_USER_RUNTIME },
[DIRECTORY_STATE] = { SD_PATH_USER_STATE_PRIVATE },
[DIRECTORY_CACHE] = { SD_PATH_USER_STATE_CACHE },
[DIRECTORY_LOGS] = { SD_PATH_USER_STATE_PRIVATE, "log" },
};
const struct table_entry *paths;
_cleanup_free_ char *p = NULL;
unsigned i;
int r;
assert_cc(ELEMENTSOF(paths_system) == ELEMENTSOF(paths_user));
paths = arg_runtime_scope == RUNTIME_SCOPE_USER ? paths_user : paths_system;
i = PTR_TO_UINT(data);
assert(i < ELEMENTSOF(paths_system));
r = sd_path_lookup(paths[i].type, paths[i].suffix, &p);
if (r < 0)
return r;
if (arg_root) {
_cleanup_free_ char *j = NULL;
j = path_join(arg_root, p);
if (!j)
return -ENOMEM;
*ret = TAKE_PTR(j);
} else
*ret = TAKE_PTR(p);
return 0;
}
static int log_unresolvable_specifier(const char *filename, unsigned line) {
static bool notified = false;
/* In system mode, this is called when /etc is not fully initialized and some specifiers are
* unresolvable. In user mode, this is called when some variables are not defined. These cases are
* not considered a fatal error, so log at LOG_NOTICE only for the first time and then downgrade this
* to LOG_DEBUG for the rest.
*
* If we're running in a chroot (--root was used or sd_booted() reports that systemd is not running),
* always use LOG_DEBUG. We may be called to initialize a chroot before booting and there is no
* expectation that machine-id and other files will be populated.
*/
int log_level = notified || arg_root || running_in_chroot() > 0 ?
LOG_DEBUG : LOG_NOTICE;
log_syntax(NULL,
log_level,
filename, line, 0,
"Failed to resolve specifier: %s, skipping.",
arg_runtime_scope == RUNTIME_SCOPE_USER ? "Required $XDG_... variable not defined" : "uninitialized /etc/ detected");
if (!notified)
log_full(log_level,
"All rules containing unresolvable specifiers will be skipped.");
notified = true;
return 0;
}
#define log_action(would, doing, fmt, ...) \
log_full(arg_dry_run ? LOG_INFO : LOG_DEBUG, \
fmt, \
arg_dry_run ? (would) : (doing), \
__VA_ARGS__)
static int user_config_paths(char ***ret) {
_cleanup_strv_free_ char **config_dirs = NULL, **data_dirs = NULL;
_cleanup_free_ char *runtime_config = NULL;
int r;
assert(ret);
/* Combined user-specific and global dirs */
r = user_search_dirs("/user-tmpfiles.d", &config_dirs, &data_dirs);
if (r < 0)
return r;
r = xdg_user_runtime_dir("/user-tmpfiles.d", &runtime_config);
if (r < 0 && !ERRNO_IS_NEG_NOINFO(r))
return r;
r = strv_consume(&config_dirs, TAKE_PTR(runtime_config));
if (r < 0)
return r;
r = strv_extend_strv_consume(&config_dirs, TAKE_PTR(data_dirs), /* filter_duplicates = */ true);
if (r < 0)
return r;
r = path_strv_make_absolute_cwd(config_dirs);
if (r < 0)
return r;
*ret = TAKE_PTR(config_dirs);
return 0;
}
static bool needs_purge(ItemType t) {
return IN_SET(t,
CREATE_FILE,
TRUNCATE_FILE,
CREATE_DIRECTORY,
TRUNCATE_DIRECTORY,
CREATE_SUBVOLUME,
CREATE_SUBVOLUME_INHERIT_QUOTA,
CREATE_SUBVOLUME_NEW_QUOTA,
CREATE_FIFO,
CREATE_SYMLINK,
CREATE_CHAR_DEVICE,
CREATE_BLOCK_DEVICE,
COPY_FILES,
WRITE_FILE,
EMPTY_DIRECTORY);
}
static bool needs_glob(ItemType t) {
return IN_SET(t,
WRITE_FILE,
EMPTY_DIRECTORY,
SET_XATTR,
RECURSIVE_SET_XATTR,
SET_ACL,
RECURSIVE_SET_ACL,
SET_ATTRIBUTE,
RECURSIVE_SET_ATTRIBUTE,
IGNORE_PATH,
IGNORE_DIRECTORY_PATH,
REMOVE_PATH,
RECURSIVE_REMOVE_PATH,
RELABEL_PATH,
RECURSIVE_RELABEL_PATH,
ADJUST_MODE);
}
static bool takes_ownership(ItemType t) {
return IN_SET(t,
CREATE_FILE,
TRUNCATE_FILE,
CREATE_DIRECTORY,
TRUNCATE_DIRECTORY,
CREATE_SUBVOLUME,
CREATE_SUBVOLUME_INHERIT_QUOTA,
CREATE_SUBVOLUME_NEW_QUOTA,
CREATE_FIFO,
CREATE_SYMLINK,
CREATE_CHAR_DEVICE,
CREATE_BLOCK_DEVICE,
COPY_FILES,
WRITE_FILE,
EMPTY_DIRECTORY,
IGNORE_PATH,
IGNORE_DIRECTORY_PATH,
REMOVE_PATH,
RECURSIVE_REMOVE_PATH);
}
static bool supports_ignore_if_target_missing(ItemType t) {
return t == CREATE_SYMLINK;
}
static struct Item* find_glob(OrderedHashmap *h, const char *match) {
ItemArray *j;
ORDERED_HASHMAP_FOREACH(j, h)
FOREACH_ARRAY(item, j->items, j->n_items)
if (fnmatch(item->path, match, FNM_PATHNAME|FNM_PERIOD) == 0)
return item;
return NULL;
}
static int load_unix_sockets(Context *c) {
_cleanup_set_free_ Set *sockets = NULL;
_cleanup_fclose_ FILE *f = NULL;
int r;
if (c->unix_sockets)
return 0;
/* We maintain a cache of the sockets we found in /proc/net/unix to speed things up a little. */
f = fopen("/proc/net/unix", "re");
if (!f)
return log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, errno,
"Failed to open /proc/net/unix, ignoring: %m");
/* Skip header */
r = read_line(f, LONG_LINE_MAX, NULL);
if (r < 0)
return log_warning_errno(r, "Failed to skip /proc/net/unix header line: %m");
if (r == 0)
return log_warning_errno(SYNTHETIC_ERRNO(EIO), "Premature end of file reading /proc/net/unix.");
for (;;) {
_cleanup_free_ char *line = NULL;
char *p;
r = read_line(f, LONG_LINE_MAX, &line);
if (r < 0)
return log_warning_errno(r, "Failed to read /proc/net/unix line, ignoring: %m");
if (r == 0) /* EOF */
break;
p = strchr(line, ':');
if (!p)
continue;
if (strlen(p) < 37)
continue;
p += 37;
p += strspn(p, WHITESPACE);
p += strcspn(p, WHITESPACE); /* skip one more word */
p += strspn(p, WHITESPACE);
if (!path_is_absolute(p))
continue;
r = set_put_strdup_full(&sockets, &path_hash_ops_free, p);
if (r < 0)
return log_warning_errno(r, "Failed to add AF_UNIX socket to set, ignoring: %m");
}
c->unix_sockets = TAKE_PTR(sockets);
return 1;
}
static bool unix_socket_alive(Context *c, const char *fn) {
assert(c);
assert(fn);
if (load_unix_sockets(c) < 0)
return true; /* We don't know, so assume yes */
return set_contains(c->unix_sockets, fn);
}
/* Accessors for the argument in binary format */
static const void* item_binary_argument(const Item *i) {
assert(i);
return i->binary_argument ?: i->argument;
}
static size_t item_binary_argument_size(const Item *i) {
assert(i);
return i->binary_argument ? i->binary_argument_size : strlen_ptr(i->argument);
}
static DIR* xopendirat_nomod(int dirfd, const char *path) {
DIR *dir;
dir = xopendirat(dirfd, path, O_NOFOLLOW|O_NOATIME);
if (dir)
return dir;
if (!IN_SET(errno, ENOENT, ELOOP))
log_debug_errno(errno, "Cannot open %sdirectory \"%s\" with O_NOATIME: %m", dirfd == AT_FDCWD ? "" : "sub", path);
if (!ERRNO_IS_PRIVILEGE(errno))
return NULL;
dir = xopendirat(dirfd, path, O_NOFOLLOW);
if (!dir)
log_debug_errno(errno, "Cannot open %sdirectory \"%s\" with or without O_NOATIME: %m", dirfd == AT_FDCWD ? "" : "sub", path);
return dir;
}
static DIR* opendir_nomod(const char *path) {
return xopendirat_nomod(AT_FDCWD, path);
}
static int opendir_and_stat(
const char *path,
DIR **ret,
struct statx *ret_sx,
bool *ret_mountpoint) {
_cleanup_closedir_ DIR *d = NULL;
STRUCT_NEW_STATX_DEFINE(st1);
int r;
assert(path);
assert(ret);
assert(ret_sx);
assert(ret_mountpoint);
/* Do opendir() and statx() on the directory.
* Return 1 if successful, 0 if file doesn't exist or is not a directory,
* negative errno otherwise.
*/
d = opendir_nomod(path);
if (!d) {
bool ignore = IN_SET(errno, ENOENT, ENOTDIR);
r = log_full_errno(ignore ? LOG_DEBUG : LOG_ERR,
errno, "Failed to open directory %s: %m", path);
if (!ignore)
return r;
*ret = NULL;
*ret_sx = (struct statx) {};
*ret_mountpoint = false;
return 0;
}
r = statx_fallback(dirfd(d), "", AT_EMPTY_PATH, STATX_MODE|STATX_INO|STATX_ATIME|STATX_MTIME, &st1.sx);
if (r < 0)
return log_error_errno(r, "statx(%s) failed: %m", path);
if (FLAGS_SET(st1.sx.stx_attributes_mask, STATX_ATTR_MOUNT_ROOT))
*ret_mountpoint = FLAGS_SET(st1.sx.stx_attributes, STATX_ATTR_MOUNT_ROOT);
else {
STRUCT_NEW_STATX_DEFINE(st2);
r = statx_fallback(dirfd(d), "..", 0, STATX_INO, &st2.sx);
if (r < 0)
return log_error_errno(r, "statx(%s/..) failed: %m", path);
*ret_mountpoint = !statx_mount_same(&st1.nsx, &st2.nsx);
}
*ret = TAKE_PTR(d);
*ret_sx = st1.sx;
return 1;
}
static bool needs_cleanup(
nsec_t atime,
nsec_t btime,
nsec_t ctime,
nsec_t mtime,
nsec_t cutoff,
const char *sub_path,
AgeBy age_by,
bool is_dir) {
if (FLAGS_SET(age_by, AGE_BY_MTIME) && mtime != NSEC_INFINITY && mtime >= cutoff) {
/* Follows spelling in stat(1). */
log_debug("%s \"%s\": modify time %s is too new.",
is_dir ? "Directory" : "File",
sub_path,
FORMAT_TIMESTAMP_STYLE(mtime / NSEC_PER_USEC, TIMESTAMP_US));
return false;
}
if (FLAGS_SET(age_by, AGE_BY_ATIME) && atime != NSEC_INFINITY && atime >= cutoff) {
log_debug("%s \"%s\": access time %s is too new.",
is_dir ? "Directory" : "File",
sub_path,
FORMAT_TIMESTAMP_STYLE(atime / NSEC_PER_USEC, TIMESTAMP_US));
return false;
}
/*
* Note: Unless explicitly specified by the user, "ctime" is ignored
* by default for directories, because we change it when deleting.
*/
if (FLAGS_SET(age_by, AGE_BY_CTIME) && ctime != NSEC_INFINITY && ctime >= cutoff) {
log_debug("%s \"%s\": change time %s is too new.",
is_dir ? "Directory" : "File",
sub_path,
FORMAT_TIMESTAMP_STYLE(ctime / NSEC_PER_USEC, TIMESTAMP_US));
return false;
}
if (FLAGS_SET(age_by, AGE_BY_BTIME) && btime != NSEC_INFINITY && btime >= cutoff) {
log_debug("%s \"%s\": birth time %s is too new.",
is_dir ? "Directory" : "File",
sub_path,
FORMAT_TIMESTAMP_STYLE(btime / NSEC_PER_USEC, TIMESTAMP_US));
return false;
}
return true;
}
static int dir_cleanup(
Context *c,
Item *i,
const char *p,
DIR *d,
nsec_t self_atime_nsec,
nsec_t self_mtime_nsec,
nsec_t cutoff_nsec,
dev_t rootdev_major,
dev_t rootdev_minor,
bool mountpoint,
int maxdepth,
bool keep_this_level,
AgeBy age_by_file,
AgeBy age_by_dir) {
bool deleted = false;
int r = 0;
assert(c);
assert(i);
assert(d);
FOREACH_DIRENT_ALL(de, d, break) {
_cleanup_free_ char *sub_path = NULL;
nsec_t atime_nsec, mtime_nsec, ctime_nsec, btime_nsec;
if (dot_or_dot_dot(de->d_name))
continue;
/* If statx() is supported, use it. It's preferable over fstatat() since it tells us
* explicitly where we are looking at a mount point, for free as side information. Determining
* the same information without statx() is hard, see the complexity of path_is_mount_point(),
* and also much slower as it requires a number of syscalls instead of just one. Hence, when
* we have modern statx() we use it instead of fstat() and do proper mount point checks,
* while on older kernels's well do traditional st_dev based detection of mount points.
*
* Using statx() for detecting mount points also has the benefit that we handle weird file
* systems such as overlayfs better where each file is originating from a different
* st_dev. */
STRUCT_STATX_DEFINE(sx);
r = statx_fallback(
dirfd(d), de->d_name,
AT_SYMLINK_NOFOLLOW|AT_NO_AUTOMOUNT,
STATX_TYPE|STATX_MODE|STATX_UID|STATX_ATIME|STATX_MTIME|STATX_CTIME|STATX_BTIME,
&sx);
if (r == -ENOENT)
continue;
if (r < 0) {
/* FUSE, NFS mounts, SELinux might return EACCES */
log_full_errno(r == -EACCES ? LOG_DEBUG : LOG_ERR, r,
"statx(%s/%s) failed: %m", p, de->d_name);
continue;
}
if (FLAGS_SET(sx.stx_attributes_mask, STATX_ATTR_MOUNT_ROOT)) {
/* Yay, we have the mount point API, use it */
if (FLAGS_SET(sx.stx_attributes, STATX_ATTR_MOUNT_ROOT)) {
log_debug("Ignoring \"%s/%s\": different mount points.", p, de->d_name);
continue;
}
} else {
/* So we might have statx() but the STATX_ATTR_MOUNT_ROOT flag is not supported, fall
* back to traditional stx_dev checking. */
if (sx.stx_dev_major != rootdev_major ||
sx.stx_dev_minor != rootdev_minor) {
log_debug("Ignoring \"%s/%s\": different filesystem.", p, de->d_name);
continue;
}
/* Try to detect bind mounts of the same filesystem instance; they do not differ in
* device major/minors. This type of query is not supported on all kernels or
* filesystem types though. */
if (S_ISDIR(sx.stx_mode)) {
int q;
q = is_mount_point_at(dirfd(d), de->d_name, 0);
if (q < 0)
log_debug_errno(q, "Failed to determine whether \"%s/%s\" is a mount point, ignoring: %m", p, de->d_name);
else if (q > 0) {
log_debug("Ignoring \"%s/%s\": different mount of the same filesystem.", p, de->d_name);
continue;
}
}
}
atime_nsec = FLAGS_SET(sx.stx_mask, STATX_ATIME) ? statx_timestamp_load_nsec(&sx.stx_atime) : 0;
mtime_nsec = FLAGS_SET(sx.stx_mask, STATX_MTIME) ? statx_timestamp_load_nsec(&sx.stx_mtime) : 0;
ctime_nsec = FLAGS_SET(sx.stx_mask, STATX_CTIME) ? statx_timestamp_load_nsec(&sx.stx_ctime) : 0;
btime_nsec = FLAGS_SET(sx.stx_mask, STATX_BTIME) ? statx_timestamp_load_nsec(&sx.stx_btime) : 0;
sub_path = path_join(p, de->d_name);
if (!sub_path) {
r = log_oom();
goto finish;
}
/* Is there an item configured for this path? */
if (ordered_hashmap_get(c->items, sub_path)) {
log_debug("Ignoring \"%s\": a separate entry exists.", sub_path);
continue;
}
if (find_glob(c->globs, sub_path)) {
log_debug("Ignoring \"%s\": a separate glob exists.", sub_path);
continue;
}
if (S_ISDIR(sx.stx_mode)) {
_cleanup_closedir_ DIR *sub_dir = NULL;
if (mountpoint &&
streq(de->d_name, "lost+found") &&
sx.stx_uid == 0) {
log_debug("Ignoring directory \"%s\".", sub_path);
continue;
}
if (maxdepth <= 0)
log_warning("Reached max depth on \"%s\".", sub_path);
else {
int q;
sub_dir = xopendirat_nomod(dirfd(d), de->d_name);
if (!sub_dir) {
if (errno != ENOENT)
r = log_warning_errno(errno, "Opening directory \"%s\" failed, ignoring: %m", sub_path);
continue;
}
if (!arg_dry_run &&
flock(dirfd(sub_dir), LOCK_EX|LOCK_NB) < 0) {
log_debug_errno(errno, "Couldn't acquire shared BSD lock on directory \"%s\", skipping: %m", sub_path);
continue;
}
q = dir_cleanup(c, i,
sub_path, sub_dir,
atime_nsec, mtime_nsec, cutoff_nsec,
rootdev_major, rootdev_minor,
false, maxdepth-1, false,
age_by_file, age_by_dir);
if (q < 0)
r = q;
}
/* Note: if you are wondering why we don't support the sticky bit for excluding
* directories from cleaning like we do it for other file system objects: well, the
* sticky bit already has a meaning for directories, so we don't want to overload
* that. */
if (keep_this_level) {
log_debug("Keeping directory \"%s\".", sub_path);
continue;
}
/*
* Check the file timestamps of an entry against the
* given cutoff time; delete if it is older.
*/
if (!needs_cleanup(atime_nsec, btime_nsec, ctime_nsec, mtime_nsec,
cutoff_nsec, sub_path, age_by_dir, true))
continue;
log_action("Would remove", "Removing", "%s directory \"%s\"", sub_path);
if (!arg_dry_run &&
unlinkat(dirfd(d), de->d_name, AT_REMOVEDIR) < 0 &&
!IN_SET(errno, ENOENT, ENOTEMPTY))
r = log_warning_errno(errno, "Failed to remove directory \"%s\", ignoring: %m", sub_path);
} else {
_cleanup_close_ int fd = -EBADF; /* This file descriptor is defined here so that the
* lock that is taken below is only dropped _after_
* the unlink operation has finished. */
/* Skip files for which the sticky bit is set. These are semantics we define, and are
* unknown elsewhere. See XDG_RUNTIME_DIR specification for details. */
if (sx.stx_mode & S_ISVTX) {
log_debug("Skipping \"%s\": sticky bit set.", sub_path);
continue;
}
if (mountpoint &&
S_ISREG(sx.stx_mode) &&
sx.stx_uid == 0 &&
STR_IN_SET(de->d_name,
".journal",
"aquota.user",
"aquota.group")) {
log_debug("Skipping \"%s\".", sub_path);
continue;
}
/* Ignore sockets that are listed in /proc/net/unix */
if (S_ISSOCK(sx.stx_mode) && unix_socket_alive(c, sub_path)) {
log_debug("Skipping \"%s\": live socket.", sub_path);
continue;
}
/* Ignore device nodes */
if (S_ISCHR(sx.stx_mode) || S_ISBLK(sx.stx_mode)) {
log_debug("Skipping \"%s\": a device.", sub_path);
continue;
}
/* Keep files on this level if this was requested */
if (keep_this_level) {
log_debug("Keeping \"%s\".", sub_path);
continue;
}
if (!needs_cleanup(atime_nsec, btime_nsec, ctime_nsec, mtime_nsec,
cutoff_nsec, sub_path, age_by_file, false))
continue;
if (!arg_dry_run) {
fd = xopenat(dirfd(d), de->d_name, O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NOATIME|O_NONBLOCK|O_NOCTTY);
if (fd < 0 && !IN_SET(fd, -ENOENT, -ELOOP))
log_warning_errno(fd, "Opening file \"%s\" failed, proceeding without lock: %m", sub_path);
if (fd >= 0 && flock(fd, LOCK_EX|LOCK_NB) < 0 && errno == EAGAIN) {
log_debug_errno(errno, "Couldn't acquire shared BSD lock on file \"%s\", skipping: %m", sub_path);
continue;
}
}
log_action("Would remove", "Removing", "%s \"%s\"", sub_path);
if (!arg_dry_run &&
unlinkat(dirfd(d), de->d_name, 0) < 0 &&
errno != ENOENT)
r = log_warning_errno(errno, "Failed to remove \"%s\", ignoring: %m", sub_path);
deleted = true;
}
}
finish:
if (deleted && (self_atime_nsec < NSEC_INFINITY || self_mtime_nsec < NSEC_INFINITY)) {
struct timespec ts[2];
log_action("Would restore", "Restoring",
"%s access and modification time on \"%s\": %s, %s",
p,
FORMAT_TIMESTAMP_STYLE(self_atime_nsec / NSEC_PER_USEC, TIMESTAMP_US),
FORMAT_TIMESTAMP_STYLE(self_mtime_nsec / NSEC_PER_USEC, TIMESTAMP_US));
timespec_store_nsec(ts + 0, self_atime_nsec);
timespec_store_nsec(ts + 1, self_mtime_nsec);
/* Restore original directory timestamps */
if (!arg_dry_run &&
futimens(dirfd(d), ts) < 0)
log_warning_errno(errno, "Failed to revert timestamps of '%s', ignoring: %m", p);
}
return r;
}
static bool hardlinks_protected(void) {
static int cached = -1;
int r;
/* Check whether the fs.protected_hardlinks sysctl is on. If we can't determine it we assume its off,
* as that's what the kernel default is.
* Note that we ship 50-default.conf where it is enabled, but better be safe than sorry. */
if (cached >= 0)
return cached;
_cleanup_free_ char *value = NULL;
r = sysctl_read("fs/protected_hardlinks", &value);
if (r < 0) {
log_debug_errno(r, "Failed to read fs.protected_hardlinks sysctl, assuming disabled: %m");
return false;
}
cached = parse_boolean(value);
if (cached < 0)
log_debug_errno(cached, "Failed to parse fs.protected_hardlinks sysctl, assuming disabled: %m");
return cached > 0;
}
static bool hardlink_vulnerable(const struct stat *st) {
assert(st);
return !S_ISDIR(st->st_mode) && st->st_nlink > 1 && !hardlinks_protected();
}
static mode_t process_mask_perms(mode_t mode, mode_t current) {
if ((current & 0111) == 0)
mode &= ~0111;
if ((current & 0222) == 0)
mode &= ~0222;
if ((current & 0444) == 0)
mode &= ~0444;
if (!S_ISDIR(current))
mode &= ~07000; /* remove sticky/sgid/suid bit, unless directory */
return mode;
}
static int fd_set_perms(
Context *c,
Item *i,
int fd,
const char *path,
const struct stat *st,
CreationMode creation) {
bool do_chown, do_chmod;
struct stat stbuf;
mode_t new_mode;
uid_t new_uid;
gid_t new_gid;
int r;
assert(c);
assert(i);
assert(fd >= 0);
assert(path);
if (!i->mode_set && !i->uid_set && !i->gid_set)
goto shortcut;
if (!st) {
if (fstat(fd, &stbuf) < 0)
return log_error_errno(errno, "fstat(%s) failed: %m", path);
st = &stbuf;
}
if (hardlink_vulnerable(st))
return log_error_errno(SYNTHETIC_ERRNO(EPERM),
"Refusing to set permissions on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.",
path);
new_uid = i->uid_set && (creation != CREATION_EXISTING || !i->uid_only_create) ? i->uid : st->st_uid;
new_gid = i->gid_set && (creation != CREATION_EXISTING || !i->gid_only_create) ? i->gid : st->st_gid;
/* Do we need a chown()? */
do_chown = (new_uid != st->st_uid) || (new_gid != st->st_gid);
/* Calculate the mode to apply */
new_mode = i->mode_set && (creation != CREATION_EXISTING || !i->mode_only_create) ?
(i->mask_perms ? process_mask_perms(i->mode, st->st_mode) : i->mode) :
(st->st_mode & 07777);
do_chmod = ((new_mode ^ st->st_mode) & 07777) != 0;
if (do_chmod && do_chown) {
/* Before we issue the chmod() let's reduce the access mode to the common bits of the old and
* the new mode. That way there's no time window where the file exists under the old owner
* with more than the old access modes — and not under the new owner with more than the new
* access modes either. */
if (S_ISLNK(st->st_mode))
log_debug("Skipping temporary mode fix for symlink %s.", path);
else {
mode_t m = new_mode & st->st_mode; /* Mask new mode by old mode */
if (((m ^ st->st_mode) & 07777) == 0)
log_debug("\"%s\" matches temporary mode %o already.", path, m);
else {
log_action("Would temporarily change", "Temporarily changing",
"%s \"%s\" to mode %o", path, m);
if (!arg_dry_run) {
r = fchmod_opath(fd, m);
if (r < 0)
return log_error_errno(r, "fchmod() of %s failed: %m", path);
}
}
}
}
if (do_chown) {
log_action("Would change", "Changing",
"%s \"%s\" to owner "UID_FMT":"GID_FMT, path, new_uid, new_gid);
if (!arg_dry_run &&
fchownat(fd, "",
new_uid != st->st_uid ? new_uid : UID_INVALID,
new_gid != st->st_gid ? new_gid : GID_INVALID,
AT_EMPTY_PATH) < 0)
return log_error_errno(errno, "fchownat() of %s failed: %m", path);
}
/* Now, apply the final mode. We do this in two cases: when the user set a mode explicitly, or after a
* chown(), since chown()'s mangle the access mode in regards to sgid/suid in some conditions. */
if (do_chmod || do_chown) {
if (S_ISLNK(st->st_mode))
log_debug("Skipping mode fix for symlink %s.", path);
else {
log_action("Would change", "Changing", "%s \"%s\" to mode %o", path, new_mode);
if (!arg_dry_run) {
r = fchmod_opath(fd, new_mode);
if (r < 0)
return log_error_errno(r, "fchmod() of %s failed: %m", path);
}
}
}
shortcut:
return label_fix_full(fd, /* inode_path= */ NULL, /* label_path= */ path, 0);
}
static int path_open_parent_safe(const char *path, bool allow_failure) {
_cleanup_free_ char *dn = NULL;
int r, fd;
if (!path_is_normalized(path))
return log_full_errno(allow_failure ? LOG_INFO : LOG_ERR,
SYNTHETIC_ERRNO(EINVAL),
"Failed to open parent of '%s': path not normalized%s.",
path,
allow_failure ? ", ignoring" : "");
r = path_extract_directory(path, &dn);
if (r < 0)
return log_full_errno(allow_failure ? LOG_INFO : LOG_ERR,
r,
"Unable to determine parent directory of '%s'%s: %m",
path,
allow_failure ? ", ignoring" : "");
r = chase(dn, arg_root, allow_failure ? CHASE_SAFE : CHASE_SAFE|CHASE_WARN, NULL, &fd);
if (r == -ENOLINK) /* Unsafe symlink: already covered by CHASE_WARN */
return r;
if (r < 0)
return log_full_errno(allow_failure ? LOG_INFO : LOG_ERR,
r,
"Failed to open path '%s'%s: %m",
dn,
allow_failure ? ", ignoring" : "");
return fd;
}
static int path_open_safe(const char *path) {
int r, fd;
/* path_open_safe() returns a file descriptor opened with O_PATH after
* verifying that the path doesn't contain unsafe transitions, except
* for its final component as the function does not follow symlink. */
assert(path);
if (!path_is_normalized(path))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Failed to open invalid path '%s'.", path);
r = chase(path, arg_root, CHASE_SAFE|CHASE_WARN|CHASE_NOFOLLOW, NULL, &fd);
if (r == -ENOLINK)
return r; /* Unsafe symlink: already covered by CHASE_WARN */
if (r < 0)
return log_error_errno(r, "Failed to open path %s: %m", path);
return fd;
}
static int path_set_perms(
Context *c,
Item *i,
const char *path,
CreationMode creation) {
_cleanup_close_ int fd = -EBADF;
assert(c);
assert(i);
assert(path);
fd = path_open_safe(path);
if (fd < 0)
return fd;
return fd_set_perms(c, i, fd, path, /* st= */ NULL, creation);
}
static int parse_xattrs_from_arg(Item *i) {
const char *p;
int r;
assert(i);
assert_se(p = i->argument);
for (;;) {
_cleanup_free_ char *name = NULL, *value = NULL, *xattr = NULL;
r = extract_first_word(&p, &xattr, NULL, EXTRACT_UNQUOTE|EXTRACT_CUNESCAPE);
if (r < 0)
log_warning_errno(r, "Failed to parse extended attribute '%s', ignoring: %m", p);
if (r <= 0)
break;
r = split_pair(xattr, "=", &name, &value);
if (r < 0) {
log_warning_errno(r, "Failed to parse extended attribute, ignoring: %s", xattr);
continue;
}
if (isempty(name) || isempty(value)) {
log_warning("Malformed extended attribute found, ignoring: %s", xattr);
continue;
}
if (strv_push_pair(&i->xattrs, name, value) < 0)
return log_oom();
name = value = NULL;
}
return 0;
}
static int fd_set_xattrs(
Context *c,
Item *i,
int fd,
const char *path,
const struct stat *st,
CreationMode creation) {
int r;
assert(c);
assert(i);
assert(fd >= 0);
assert(path);
STRV_FOREACH_PAIR(name, value, i->xattrs) {
log_action("Would set", "Setting",
"%s extended attribute '%s=%s' on %s", *name, *value, path);
if (!arg_dry_run) {
r = xsetxattr(fd, /* path = */ NULL, AT_EMPTY_PATH, *name, *value);
if (r < 0)
return log_error_errno(r, "Failed to set extended attribute %s=%s on '%s': %m",
*name, *value, path);
}
}
return 0;
}
static int path_set_xattrs(
Context *c,
Item *i,
const char *path,
CreationMode creation) {
_cleanup_close_ int fd = -EBADF;
assert(c);
assert(i);
assert(path);
fd = path_open_safe(path);
if (fd < 0)
return fd;
return fd_set_xattrs(c, i, fd, path, /* st = */ NULL, creation);
}
static int parse_acls_from_arg(Item *item) {
#if HAVE_ACL
int r;
assert(item);
/* If append_or_force (= modify) is set, we will not modify the acl
* afterwards, so the mask can be added now if necessary. */
r = parse_acl(item->argument, &item->acl_access, &item->acl_access_exec,
&item->acl_default, !item->append_or_force);
if (r < 0)
log_full_errno(arg_graceful && IN_SET(r, -EINVAL, -ENOENT, -ESRCH) ? LOG_DEBUG : LOG_WARNING,
r, "Failed to parse ACL \"%s\", ignoring: %m", item->argument);
#else
log_warning("ACLs are not supported, ignoring.");
#endif
return 0;
}
#if HAVE_ACL
static int parse_acl_cond_exec(
const char *path,
const struct stat *st,
acl_t cond_exec,
acl_t access, /* could be empty (NULL) */
bool append,
acl_t *ret) {
acl_entry_t entry;
acl_permset_t permset;
bool has_exec;
int r;
assert(path);
assert(st);
assert(cond_exec);
assert(ret);
if (!S_ISDIR(st->st_mode)) {
_cleanup_(acl_freep) acl_t old = NULL;
old = acl_get_file(path, ACL_TYPE_ACCESS);
if (!old)
return -errno;
has_exec = false;
for (r = acl_get_entry(old, ACL_FIRST_ENTRY, &entry);
r > 0;
r = acl_get_entry(old, ACL_NEXT_ENTRY, &entry)) {
acl_tag_t tag;
if (acl_get_tag_type(entry, &tag) < 0)
return -errno;
if (tag == ACL_MASK)
continue;
/* If not appending, skip ACL definitions */
if (!append && IN_SET(tag, ACL_USER, ACL_GROUP))
continue;
if (acl_get_permset(entry, &permset) < 0)
return -errno;
r = acl_get_perm(permset, ACL_EXECUTE);
if (r < 0)
return -errno;
if (r > 0) {
has_exec = true;
break;
}
}
if (r < 0)
return -errno;
/* Check if we're about to set the execute bit in acl_access */
if (!has_exec && access) {
for (r = acl_get_entry(access, ACL_FIRST_ENTRY, &entry);
r > 0;
r = acl_get_entry(access, ACL_NEXT_ENTRY, &entry)) {
if (acl_get_permset(entry, &permset) < 0)
return -errno;
r = acl_get_perm(permset, ACL_EXECUTE);
if (r < 0)
return -errno;
if (r > 0) {
has_exec = true;
break;
}
}
if (r < 0)
return -errno;
}
} else
has_exec = true;
_cleanup_(acl_freep) acl_t parsed = access ? acl_dup(access) : acl_init(0);
if (!parsed)
return -errno;
for (r = acl_get_entry(cond_exec, ACL_FIRST_ENTRY, &entry);
r > 0;
r = acl_get_entry(cond_exec, ACL_NEXT_ENTRY, &entry)) {
acl_entry_t parsed_entry;
if (acl_create_entry(&parsed, &parsed_entry) < 0)
return -errno;
if (acl_copy_entry(parsed_entry, entry) < 0)
return -errno;
/* We substituted 'X' with 'x' in parse_acl(), so drop execute bit here if not applicable. */
if (!has_exec) {
if (acl_get_permset(parsed_entry, &permset) < 0)
return -errno;
if (acl_delete_perm(permset, ACL_EXECUTE) < 0)
return -errno;
}
}
if (r < 0)
return -errno;
if (!append) { /* want_mask = true */
r = calc_acl_mask_if_needed(&parsed);
if (r < 0)
return r;
}
*ret = TAKE_PTR(parsed);
return 0;
}
static int path_set_acl(
Context *c,
const char *path,
const char *pretty,
acl_type_t type,
acl_t acl,
bool modify) {
_cleanup_(acl_free_charpp) char *t = NULL;
_cleanup_(acl_freep) acl_t dup = NULL;
int r;
assert(c);
/* Returns 0 for success, positive error if already warned, negative error otherwise. */
if (modify) {
r = acls_for_file(path, type, acl, &dup);
if (r < 0)
return r;
r = calc_acl_mask_if_needed(&dup);
if (r < 0)
return r;
} else {
dup = acl_dup(acl);
if (!dup)
return -errno;
/* the mask was already added earlier if needed */
}
r = add_base_acls_if_needed(&dup, path);
if (r < 0)
return r;
t = acl_to_any_text(dup, NULL, ',', TEXT_ABBREVIATE);
log_action("Would set", "Setting",
"%s %s ACL %s on %s",
type == ACL_TYPE_ACCESS ? "access" : "default",
strna(t), pretty);
if (!arg_dry_run &&
acl_set_file(path, type, dup) < 0) {
if (ERRNO_IS_NOT_SUPPORTED(errno))
/* No error if filesystem doesn't support ACLs. Return negative. */
return -errno;
else
/* Return positive to indicate we already warned */
return -log_error_errno(errno,
"Setting %s ACL \"%s\" on %s failed: %m",
type == ACL_TYPE_ACCESS ? "access" : "default",
strna(t), pretty);
}
return 0;
}
#endif
static int fd_set_acls(
Context *c,
Item *item,
int fd,
const char *path,
const struct stat *st,
CreationMode creation) {
int r = 0;
#if HAVE_ACL
_cleanup_(acl_freep) acl_t access_with_exec_parsed = NULL;
struct stat stbuf;
assert(c);
assert(item);
assert(fd >= 0);
assert(path);
if (!st) {
if (fstat(fd, &stbuf) < 0)
return log_error_errno(errno, "fstat(%s) failed: %m", path);
st = &stbuf;
}
if (hardlink_vulnerable(st))
return log_error_errno(SYNTHETIC_ERRNO(EPERM),
"Refusing to set ACLs on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.",
path);
if (S_ISLNK(st->st_mode)) {
log_debug("Skipping ACL fix for symlink %s.", path);
return 0;
}
if (item->acl_access_exec) {
r = parse_acl_cond_exec(FORMAT_PROC_FD_PATH(fd), st,
item->acl_access_exec,
item->acl_access,
item->append_or_force,
&access_with_exec_parsed);
if (r < 0)
return log_error_errno(r, "Failed to parse conditionalized execute bit for \"%s\": %m", path);
r = path_set_acl(c, FORMAT_PROC_FD_PATH(fd), path, ACL_TYPE_ACCESS, access_with_exec_parsed, item->append_or_force);
} else if (item->acl_access)
r = path_set_acl(c, FORMAT_PROC_FD_PATH(fd), path, ACL_TYPE_ACCESS, item->acl_access, item->append_or_force);
/* set only default acls to folders */
if (r == 0 && item->acl_default && S_ISDIR(st->st_mode))
r = path_set_acl(c, FORMAT_PROC_FD_PATH(fd), path, ACL_TYPE_DEFAULT, item->acl_default, item->append_or_force);
if (ERRNO_IS_NOT_SUPPORTED(r)) {
log_debug_errno(r, "ACLs not supported by file system at %s", path);
return 0;
}
if (r > 0)
return -r; /* already warned in path_set_acl */
if (r < 0)
return log_error_errno(r, "ACL operation on \"%s\" failed: %m", path);
#endif
return r;
}
static int path_set_acls(
Context *c,
Item *item,
const char *path,
CreationMode creation) {
int r = 0;
#if HAVE_ACL
_cleanup_close_ int fd = -EBADF;
assert(c);
assert(item);
assert(path);
fd = path_open_safe(path);
if (fd < 0)
return fd;
r = fd_set_acls(c, item, fd, path, /* st= */ NULL, creation);
#endif
return r;
}
static int parse_attribute_from_arg(Item *item) {
static const struct {
char character;
unsigned value;
} attributes[] = {
{ 'A', FS_NOATIME_FL }, /* do not update atime */
{ 'S', FS_SYNC_FL }, /* Synchronous updates */
{ 'D', FS_DIRSYNC_FL }, /* dirsync behaviour (directories only) */
{ 'a', FS_APPEND_FL }, /* writes to file may only append */
{ 'c', FS_COMPR_FL }, /* Compress file */
{ 'd', FS_NODUMP_FL }, /* do not dump file */
{ 'e', FS_EXTENT_FL }, /* Extents */
{ 'i', FS_IMMUTABLE_FL }, /* Immutable file */
{ 'j', FS_JOURNAL_DATA_FL }, /* Reserved for ext3 */
{ 's', FS_SECRM_FL }, /* Secure deletion */
{ 'u', FS_UNRM_FL }, /* Undelete */
{ 't', FS_NOTAIL_FL }, /* file tail should not be merged */
{ 'T', FS_TOPDIR_FL }, /* Top of directory hierarchies */
{ 'C', FS_NOCOW_FL }, /* Do not cow file */
{ 'P', FS_PROJINHERIT_FL }, /* Inherit the quota project ID */
};
enum {
MODE_ADD,
MODE_DEL,
MODE_SET
} mode = MODE_ADD;
unsigned value = 0, mask = 0;
const char *p;
assert(item);
p = item->argument;
if (p) {
if (*p == '+') {
mode = MODE_ADD;
p++;
} else if (*p == '-') {
mode = MODE_DEL;
p++;
} else if (*p == '=') {
mode = MODE_SET;
p++;
}
}
if (isempty(p) && mode != MODE_SET)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Setting file attribute on '%s' needs an attribute specification.",
item->path);
for (; p && *p ; p++) {
unsigned i, v;
for (i = 0; i < ELEMENTSOF(attributes); i++)
if (*p == attributes[i].character)
break;
if (i >= ELEMENTSOF(attributes))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Unknown file attribute '%c' on '%s'.", *p, item->path);
v = attributes[i].value;
SET_FLAG(value, v, IN_SET(mode, MODE_ADD, MODE_SET));
mask |= v;
}
if (mode == MODE_SET)
mask |= CHATTR_ALL_FL;
assert(mask != 0);
item->attribute_mask = mask;
item->attribute_value = value;
item->attribute_set = true;
return 0;
}
static int fd_set_attribute(
Context *c,
Item *item,
int fd,
const char *path,
const struct stat *st,
CreationMode creation) {
struct stat stbuf;
unsigned f;
int r;
assert(c);
assert(item);
assert(fd >= 0);
assert(path);
if (!item->attribute_set || item->attribute_mask == 0)
return 0;
if (!st) {
if (fstat(fd, &stbuf) < 0)
return log_error_errno(errno, "fstat(%s) failed: %m", path);
st = &stbuf;
}
/* Issuing the file attribute ioctls on device nodes is not safe, as that will be delivered to the
* drivers, not the file system containing the device node. */
if (!S_ISREG(st->st_mode) && !S_ISDIR(st->st_mode))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Setting file flags is only supported on regular files and directories, cannot set on '%s'.",
path);
f = item->attribute_value & item->attribute_mask;
/* Mask away directory-specific flags */
if (!S_ISDIR(st->st_mode))
f &= ~FS_DIRSYNC_FL;
log_action("Would try to set", "Trying to set",
"%s file attributes 0x%08x on %s",
f & item->attribute_mask,
path);
if (!arg_dry_run) {
_cleanup_close_ int procfs_fd = -EBADF;
procfs_fd = fd_reopen(fd, O_RDONLY|O_CLOEXEC|O_NOATIME);
if (procfs_fd < 0)
return log_error_errno(procfs_fd, "Failed to reopen '%s': %m", path);
unsigned previous, current;
r = chattr_full(procfs_fd, NULL, f, item->attribute_mask, &previous, &current, CHATTR_FALLBACK_BITWISE);
if (r == -ENOANO)
log_warning("Cannot set file attributes for '%s', maybe due to incompatibility in specified attributes, "
"previous=0x%08x, current=0x%08x, expected=0x%08x, ignoring.",
path, previous, current, (previous & ~item->attribute_mask) | (f & item->attribute_mask));
else if (r < 0)
log_full_errno(ERRNO_IS_NOT_SUPPORTED(r) ? LOG_DEBUG : LOG_WARNING, r,
"Cannot set file attributes for '%s', value=0x%08x, mask=0x%08x, ignoring: %m",
path, item->attribute_value, item->attribute_mask);
}
return 0;
}
static int path_set_attribute(
Context *c,
Item *item,
const char *path,
CreationMode creation) {
_cleanup_close_ int fd = -EBADF;
assert(c);
assert(item);
if (!item->attribute_set || item->attribute_mask == 0)
return 0;
fd = path_open_safe(path);
if (fd < 0)
return fd;
return fd_set_attribute(c, item, fd, path, /* st= */ NULL, creation);
}
static int write_argument_data(Item *i, int fd, const char *path) {
int r;
assert(i);
assert(fd >= 0);
assert(path);
if (item_binary_argument_size(i) == 0)
return 0;
assert(item_binary_argument(i));
log_action("Would write", "Writing", "%s to \"%s\"", path);
if (!arg_dry_run) {
r = loop_write(fd, item_binary_argument(i), item_binary_argument_size(i));
if (r < 0)
return log_error_errno(r, "Failed to write file \"%s\": %m", path);
}
return 0;
}
static int write_one_file(Context *c, Item *i, const char *path, CreationMode creation) {
_cleanup_close_ int fd = -EBADF, dir_fd = -EBADF;
_cleanup_free_ char *bn = NULL;
int r;
assert(c);
assert(i);
assert(path);
assert(i->type == WRITE_FILE);
r = path_extract_filename(path, &bn);
if (r < 0)
return log_error_errno(r, "Failed to extract filename from path '%s': %m", path);
if (r == O_DIRECTORY)
return log_error_errno(SYNTHETIC_ERRNO(EISDIR), "Cannot open path '%s' for writing, is a directory.", path);
/* Validate the path and keep the fd on the directory for opening the file so we're sure that it
* can't be changed behind our back. */
dir_fd = path_open_parent_safe(path, i->allow_failure);
if (dir_fd < 0)
return dir_fd;
/* Follow symlinks. Open with O_PATH in dry-run mode to make sure we don't use the path inadvertently. */
int flags = O_NONBLOCK | O_CLOEXEC | O_WRONLY | O_NOCTTY | i->append_or_force * O_APPEND | arg_dry_run * O_PATH;
fd = openat(dir_fd, bn, flags, i->mode);
if (fd < 0) {
if (errno == ENOENT) {
log_debug_errno(errno, "Not writing missing file \"%s\": %m", path);
return 0;
}
if (i->allow_failure)
return log_debug_errno(errno, "Failed to open file \"%s\", ignoring: %m", path);
return log_error_errno(errno, "Failed to open file \"%s\": %m", path);
}
/* 'w' is allowed to write into any kind of files. */
r = write_argument_data(i, fd, path);
if (r < 0)
return r;
return fd_set_perms(c, i, fd, path, NULL, creation);
}
static int create_file(
Context *c,
Item *i,
const char *path) {
_cleanup_close_ int fd = -EBADF, dir_fd = -EBADF;
_cleanup_free_ char *bn = NULL;
struct stat stbuf, *st = NULL;
CreationMode creation;
int r = 0;
assert(c);
assert(i);
assert(path);
assert(i->type == CREATE_FILE);
/* 'f' operates on regular files exclusively. */
r = path_extract_filename(path, &bn);
if (r < 0)
return log_error_errno(r, "Failed to extract filename from path '%s': %m", path);
if (r == O_DIRECTORY)
return log_error_errno(SYNTHETIC_ERRNO(EISDIR), "Cannot open path '%s' for writing, is a directory.", path);
if (arg_dry_run) {
log_info("Would create file %s", path);
return 0;
/* The opening of the directory below would fail if it doesn't exist,
* so log and exit before even trying to do that. */
}
/* Validate the path and keep the fd on the directory for opening the file so we're sure that it
* can't be changed behind our back. */
dir_fd = path_open_parent_safe(path, i->allow_failure);
if (dir_fd < 0)
return dir_fd;
WITH_UMASK(0000) {
mac_selinux_create_file_prepare(path, S_IFREG);
fd = RET_NERRNO(openat(dir_fd, bn, O_CREAT|O_EXCL|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode));
mac_selinux_create_file_clear();
}
if (fd < 0) {
/* Even on a read-only filesystem, open(2) returns EEXIST if the file already exists. It
* returns EROFS only if it needs to create the file. */
if (fd != -EEXIST)
return log_error_errno(fd, "Failed to create file %s: %m", path);
/* Re-open the file. At that point it must exist since open(2) failed with EEXIST. We still
* need to check if the perms/mode need to be changed. For read-only filesystems, we let
* fd_set_perms() report the error if the perms need to be modified. */
fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
if (fd < 0)
return log_error_errno(errno, "Failed to reopen file %s: %m", path);
if (fstat(fd, &stbuf) < 0)
return log_error_errno(errno, "stat(%s) failed: %m", path);
if (!S_ISREG(stbuf.st_mode))
return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
"%s exists and is not a regular file.",
path);
st = &stbuf;
creation = CREATION_EXISTING;
} else {
r = write_argument_data(i, fd, path);
if (r < 0)
return r;
creation = CREATION_NORMAL;
}
return fd_set_perms(c, i, fd, path, st, creation);
}
static int truncate_file(
Context *c,
Item *i,
const char *path) {
_cleanup_close_ int fd = -EBADF, dir_fd = -EBADF;
_cleanup_free_ char *bn = NULL;
struct stat stbuf, *st = NULL;
CreationMode creation;
bool erofs = false;
int r = 0;
assert(c);
assert(i);
assert(path);
assert(i->type == TRUNCATE_FILE || (i->type == CREATE_FILE && i->append_or_force));
/* We want to operate on regular file exclusively especially since O_TRUNC is unspecified if the file
* is neither a regular file nor a fifo nor a terminal device. Therefore we first open the file and
* make sure it's a regular one before truncating it. */
r = path_extract_filename(path, &bn);
if (r < 0)
return log_error_errno(r, "Failed to extract filename from path '%s': %m", path);
if (r == O_DIRECTORY)
return log_error_errno(SYNTHETIC_ERRNO(EISDIR), "Cannot open path '%s' for truncation, is a directory.", path);
/* Validate the path and keep the fd on the directory for opening the file so we're sure that it
* can't be changed behind our back. */
dir_fd = path_open_parent_safe(path, i->allow_failure);
if (dir_fd < 0)
return dir_fd;
if (arg_dry_run) {
log_info("Would truncate %s", path);
return 0;
}
creation = CREATION_EXISTING;
fd = RET_NERRNO(openat(dir_fd, bn, O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode));
if (fd == -ENOENT) {
creation = CREATION_NORMAL; /* Didn't work without O_CREATE, try again with */
WITH_UMASK(0000) {
mac_selinux_create_file_prepare(path, S_IFREG);
fd = RET_NERRNO(openat(dir_fd, bn, O_CREAT|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode));
mac_selinux_create_file_clear();
}
}
if (fd < 0) {
if (fd != -EROFS)
return log_error_errno(fd, "Failed to open/create file %s: %m", path);
/* On a read-only filesystem, we don't want to fail if the target is already empty and the
* perms are set. So we still proceed with the sanity checks and let the remaining operations
* fail with EROFS if they try to modify the target file. */
fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
if (fd < 0) {
if (errno == ENOENT)
return log_error_errno(SYNTHETIC_ERRNO(EROFS),
"Cannot create file %s on a read-only file system.",
path);
return log_error_errno(errno, "Failed to reopen file %s: %m", path);
}
erofs = true;
creation = CREATION_EXISTING;
}
if (fstat(fd, &stbuf) < 0)
return log_error_errno(errno, "stat(%s) failed: %m", path);
if (!S_ISREG(stbuf.st_mode))
return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
"%s exists and is not a regular file.",
path);
if (stbuf.st_size > 0) {
if (ftruncate(fd, 0) < 0) {
r = erofs ? -EROFS : -errno;
return log_error_errno(r, "Failed to truncate file %s: %m", path);
}
} else
st = &stbuf;
log_debug("\"%s\" has been created.", path);
if (item_binary_argument(i)) {
r = write_argument_data(i, fd, path);
if (r < 0)
return r;
}
return fd_set_perms(c, i, fd, path, st, creation);
}
static int copy_files(Context *c, Item *i) {
_cleanup_close_ int dfd = -EBADF, fd = -EBADF;
_cleanup_free_ char *bn = NULL;
struct stat st, a;
int r;
log_action("Would copy", "Copying", "%s tree \"%s\" to \"%s\"", i->argument, i->path);
if (arg_dry_run)
return 0;
r = path_extract_filename(i->path, &bn);
if (r < 0)
return log_error_errno(r, "Failed to extract filename from path '%s': %m", i->path);
/* Validate the path and use the returned directory fd for copying the target so we're sure that the
* path can't be changed behind our back. */
dfd = path_open_parent_safe(i->path, i->allow_failure);
if (dfd < 0)
return dfd;
r = copy_tree_at(AT_FDCWD, i->argument,
dfd, bn,
i->uid_set ? i->uid : UID_INVALID,
i->gid_set ? i->gid : GID_INVALID,
COPY_REFLINK | ((i->append_or_force) ? COPY_MERGE : COPY_MERGE_EMPTY) | COPY_MAC_CREATE | COPY_HARDLINKS,
NULL, NULL);
fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
if (fd < 0) {
if (r < 0) /* Look at original error first */
return log_error_errno(r, "Failed to copy files to %s: %m", i->path);
return log_error_errno(errno, "Failed to openat(%s): %m", i->path);
}
if (fstat(fd, &st) < 0)
return log_error_errno(errno, "Failed to fstat(%s): %m", i->path);
if (stat(i->argument, &a) < 0)
return log_error_errno(errno, "Failed to stat(%s): %m", i->argument);
if (((st.st_mode ^ a.st_mode) & S_IFMT) != 0) {
log_debug("Can't copy to %s, file exists already and is of different type", i->path);
return 0;
}
return fd_set_perms(c, i, fd, i->path, &st, _CREATION_MODE_INVALID);
}
static int create_directory_or_subvolume(
const char *path,
mode_t mode,
bool subvol,
bool allow_failure,
struct stat *ret_st,
CreationMode *ret_creation) {
_cleanup_free_ char *bn = NULL;
_cleanup_close_ int pfd = -EBADF;
CreationMode creation;
struct stat st;
int r, fd;
assert(path);
r = path_extract_filename(path, &bn);
if (r < 0)
return log_error_errno(r, "Failed to extract filename from path '%s': %m", path);
pfd = path_open_parent_safe(path, allow_failure);
if (pfd < 0)
return pfd;
if (subvol) {
r = getenv_bool("SYSTEMD_TMPFILES_FORCE_SUBVOL");
if (r < 0) {
if (r != -ENXIO) /* env var is unset */
log_warning_errno(r, "Cannot parse value of $SYSTEMD_TMPFILES_FORCE_SUBVOL, ignoring.");
r = btrfs_is_subvol(empty_to_root(arg_root)) > 0;
}
if (r == 0)
/* Don't create a subvolume unless the root directory is one, too. We do this under
* the assumption that if the root directory is just a plain directory (i.e. very
* lightweight), we shouldn't try to split it up into subvolumes (i.e. more
* heavy-weight). Thus, chroot() environments and suchlike will get a full brtfs
* subvolume set up below their tree only if they specifically set up a btrfs
* subvolume for the root dir too. */
subvol = false;
else {
log_action("Would create", "Creating", "%s btrfs subvolume %s", path);
if (!arg_dry_run)
WITH_UMASK((~mode) & 0777)
r = btrfs_subvol_make(pfd, bn);
else
r = 0;
}
} else
r = 0;
if (!subvol || ERRNO_IS_NEG_NOT_SUPPORTED(r)) {
log_action("Would create", "Creating", "%s directory \"%s\"", path);
if (!arg_dry_run)
WITH_UMASK(0000)
r = mkdirat_label(pfd, bn, mode);
}
if (arg_dry_run)
return 0;
creation = r >= 0 ? CREATION_NORMAL : CREATION_EXISTING;
fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_DIRECTORY|O_PATH);
if (fd < 0) {
/* We couldn't open it because it is not actually a directory? */
if (errno == ENOTDIR)
return log_error_errno(SYNTHETIC_ERRNO(EEXIST), "\"%s\" already exists and is not a directory.", path);
/* Then look at the original error */
if (r < 0)
return log_full_errno(allow_failure ? LOG_INFO : LOG_ERR,
r,
"Failed to create directory or subvolume \"%s\"%s: %m",
path,
allow_failure ? ", ignoring" : "");
return log_error_errno(errno, "Failed to open directory/subvolume we just created '%s': %m", path);
}
if (fstat(fd, &st) < 0)
return log_error_errno(errno, "Failed to fstat(%s): %m", path);
assert(S_ISDIR(st.st_mode)); /* we used O_DIRECTORY above */
log_debug("%s directory \"%s\".", creation_mode_verb_to_string(creation), path);
if (ret_st)
*ret_st = st;
if (ret_creation)
*ret_creation = creation;
return fd;
}
static int create_directory(
Context *c,
Item *i,
const char *path) {
_cleanup_close_ int fd = -EBADF;
CreationMode creation;
struct stat st;
assert(c);
assert(i);
assert(IN_SET(i->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY));
if (arg_dry_run) {
log_info("Would create directory %s", path);
return 0;
}
fd = create_directory_or_subvolume(path, i->mode, /* subvol= */ false, i->allow_failure, &st, &creation);
if (fd == -EEXIST)
return 0;
if (fd < 0)
return fd;
return fd_set_perms(c, i, fd, path, &st, creation);
}
static int create_subvolume(
Context *c,
Item *i,
const char *path) {
_cleanup_close_ int fd = -EBADF;
CreationMode creation;
struct stat st;
int r, q = 0;
assert(c);
assert(i);
assert(IN_SET(i->type, CREATE_SUBVOLUME, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA));
if (arg_dry_run) {
log_info("Would create subvolume %s", path);
return 0;
}
fd = create_directory_or_subvolume(path, i->mode, /* subvol = */ true, i->allow_failure, &st, &creation);
if (fd == -EEXIST)
return 0;
if (fd < 0)
return fd;
if (creation == CREATION_NORMAL &&
IN_SET(i->type, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA)) {
r = btrfs_subvol_auto_qgroup_fd(fd, 0, i->type == CREATE_SUBVOLUME_NEW_QUOTA);
if (r == -ENOTTY)
log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (unsupported fs or dir not a subvolume): %m", i->path);
else if (r == -EROFS)
log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (fs is read-only).", i->path);
else if (r == -ENOTCONN)
log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (quota support is disabled).", i->path);
else if (r < 0)
q = log_error_errno(r, "Failed to adjust quota for subvolume \"%s\": %m", i->path);
else if (r > 0)
log_debug("Adjusted quota for subvolume \"%s\".", i->path);
else if (r == 0)
log_debug("Quota for subvolume \"%s\" already in place, no change made.", i->path);
}
r = fd_set_perms(c, i, fd, path, &st, creation);
if (q < 0) /* prefer the quota change error from above */
return q;
return r;
}
static int empty_directory(
Context *c,
Item *i,
const char *path,
CreationMode creation) {
_cleanup_close_ int fd = -EBADF;
struct stat st;
int r;
assert(c);
assert(i);
assert(i->type == EMPTY_DIRECTORY);
r = chase(path, arg_root, CHASE_SAFE|CHASE_WARN, NULL, &fd);
if (r == -ENOLINK) /* Unsafe symlink: already covered by CHASE_WARN */
return r;
if (r == -ENOENT) {
/* Option "e" operates only on existing objects. Do not print errors about non-existent files
* or directories */
log_debug_errno(r, "Skipping missing directory: %s", path);
return 0;
}
if (r < 0)
return log_error_errno(r, "Failed to open directory '%s': %m", path);
if (fstat(fd, &st) < 0)
return log_error_errno(errno, "Failed to fstat(%s): %m", path);
if (!S_ISDIR(st.st_mode)) {
log_warning("'%s' already exists and is not a directory.", path);
return 0;
}
return fd_set_perms(c, i, fd, path, &st, creation);
}
static int create_device(
Context *c,
Item *i,
mode_t file_type) {
_cleanup_close_ int dfd = -EBADF, fd = -EBADF;
_cleanup_free_ char *bn = NULL;
CreationMode creation;
struct stat st;
int r;
assert(c);
assert(i);
assert(IN_SET(i->type, CREATE_BLOCK_DEVICE, CREATE_CHAR_DEVICE));
assert(IN_SET(file_type, S_IFBLK, S_IFCHR));
r = path_extract_filename(i->path, &bn);
if (r < 0)
return log_error_errno(r, "Failed to extract filename from path '%s': %m", i->path);
if (r == O_DIRECTORY)
return log_error_errno(SYNTHETIC_ERRNO(EISDIR),
"Cannot open path '%s' for creating device node, is a directory.", i->path);
if (arg_dry_run) {
log_info("Would create device node %s", i->path);
return 0;
}
/* Validate the path and use the returned directory fd for copying the target so we're sure that the
* path can't be changed behind our back. */
dfd = path_open_parent_safe(i->path, i->allow_failure);
if (dfd < 0)
return dfd;
WITH_UMASK(0000) {
mac_selinux_create_file_prepare(i->path, file_type);
r = RET_NERRNO(mknodat(dfd, bn, i->mode | file_type, i->major_minor));
mac_selinux_create_file_clear();
}
creation = r >= 0 ? CREATION_NORMAL : CREATION_EXISTING;
/* Try to open the inode via O_PATH, regardless if we could create it or not. Maybe everything is in
* order anyway and we hence can ignore the error to create the device node */
fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
if (fd < 0) {
/* OK, so opening the inode failed, let's look at the original error then. */
if (r < 0) {
if (ERRNO_IS_PRIVILEGE(r))
goto handle_privilege;
return log_error_errno(r, "Failed to create device node '%s': %m", i->path);
}
return log_error_errno(errno, "Failed to open device node '%s' we just created: %m", i->path);
}
if (fstat(fd, &st) < 0)
return log_error_errno(errno, "Failed to fstat(%s): %m", i->path);
if (((st.st_mode ^ file_type) & S_IFMT) != 0) {
if (i->append_or_force) {
fd = safe_close(fd);
WITH_UMASK(0000) {
mac_selinux_create_file_prepare(i->path, file_type);
r = mknodat_atomic(dfd, bn, i->mode | file_type, i->major_minor);
mac_selinux_create_file_clear();
}
if (ERRNO_IS_PRIVILEGE(r))
goto handle_privilege;
if (IN_SET(r, -EISDIR, -EEXIST, -ENOTEMPTY)) {
r = rm_rf_child(dfd, bn, REMOVE_PHYSICAL);
if (r < 0)
return log_error_errno(r, "rm -rf %s failed: %m", i->path);
mac_selinux_create_file_prepare(i->path, file_type);
r = RET_NERRNO(mknodat(dfd, bn, i->mode | file_type, i->major_minor));
mac_selinux_create_file_clear();
}
if (r < 0)
return log_error_errno(r, "Failed to create device node '%s': %m", i->path);
fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
if (fd < 0)
return log_error_errno(errno, "Failed to open device node we just created '%s': %m", i->path);
/* Validate type before change ownership below */
if (fstat(fd, &st) < 0)
return log_error_errno(errno, "Failed to fstat(%s): %m", i->path);
if (((st.st_mode ^ file_type) & S_IFMT) != 0)
return log_error_errno(SYNTHETIC_ERRNO(EBADF),
"Device node we just created is not a device node, refusing.");
creation = CREATION_FORCE;
} else {
log_warning("\"%s\" already exists and is not a device node.", i->path);
return 0;
}
}
log_debug("%s %s device node \"%s\" %u:%u.",
creation_mode_verb_to_string(creation),
i->type == CREATE_BLOCK_DEVICE ? "block" : "char",
i->path, major(i->mode), minor(i->mode));
return fd_set_perms(c, i, fd, i->path, &st, creation);
handle_privilege:
log_debug_errno(r,
"We lack permissions, possibly because of cgroup configuration; "
"skipping creation of device node '%s'.", i->path);
return 0;
}
static int create_fifo(Context *c, Item *i) {
_cleanup_close_ int pfd = -EBADF, fd = -EBADF;
_cleanup_free_ char *bn = NULL;
CreationMode creation;
struct stat st;
int r;
assert(c);
assert(i);
assert(i->type == CREATE_FIFO);
r = path_extract_filename(i->path, &bn);
if (r < 0)
return log_error_errno(r, "Failed to extract filename from path '%s': %m", i->path);
if (r == O_DIRECTORY)
return log_error_errno(SYNTHETIC_ERRNO(EISDIR),
"Cannot open path '%s' for creating FIFO, is a directory.", i->path);
if (arg_dry_run) {
log_info("Would create fifo %s", i->path);
return 0;
}
pfd = path_open_parent_safe(i->path, i->allow_failure);
if (pfd < 0)
return pfd;
WITH_UMASK(0000) {
mac_selinux_create_file_prepare(i->path, S_IFIFO);
r = RET_NERRNO(mkfifoat(pfd, bn, i->mode));
mac_selinux_create_file_clear();
}
creation = r >= 0 ? CREATION_NORMAL : CREATION_EXISTING;
/* Open the inode via O_PATH, regardless if we managed to create it or not. Maybe it is already the FIFO we want */
fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
if (fd < 0) {
if (r < 0)
return log_error_errno(r, "Failed to create FIFO %s: %m", i->path); /* original error! */
return log_error_errno(errno, "Failed to open FIFO we just created %s: %m", i->path);
}
if (fstat(fd, &st) < 0)
return log_error_errno(errno, "Failed to fstat(%s): %m", i->path);
if (!S_ISFIFO(st.st_mode)) {
if (i->append_or_force) {
fd = safe_close(fd);
WITH_UMASK(0000) {
mac_selinux_create_file_prepare(i->path, S_IFIFO);
r = mkfifoat_atomic(pfd, bn, i->mode);
mac_selinux_create_file_clear();
}
if (IN_SET(r, -EISDIR, -EEXIST, -ENOTEMPTY)) {
r = rm_rf_child(pfd, bn, REMOVE_PHYSICAL);
if (r < 0)
return log_error_errno(r, "rm -rf %s failed: %m", i->path);
mac_selinux_create_file_prepare(i->path, S_IFIFO);
r = RET_NERRNO(mkfifoat(pfd, bn, i->mode));
mac_selinux_create_file_clear();
}
if (r < 0)
return log_error_errno(r, "Failed to create FIFO %s: %m", i->path);
fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
if (fd < 0)
return log_error_errno(errno, "Failed to open FIFO we just created '%s': %m", i->path);
/* Validate type before change ownership below */
if (fstat(fd, &st) < 0)
return log_error_errno(errno, "Failed to fstat(%s): %m", i->path);
if (!S_ISFIFO(st.st_mode))
return log_error_errno(SYNTHETIC_ERRNO(EBADF),
"FIFO inode we just created is not a FIFO, refusing.");
creation = CREATION_FORCE;
} else {
log_warning("\"%s\" already exists and is not a FIFO.", i->path);
return 0;
}
}
log_debug("%s fifo \"%s\".", creation_mode_verb_to_string(creation), i->path);
return fd_set_perms(c, i, fd, i->path, &st, creation);
}
static int create_symlink(Context *c, Item *i) {
_cleanup_close_ int pfd = -EBADF, fd = -EBADF;
_cleanup_free_ char *bn = NULL;
CreationMode creation;
struct stat st;
bool good = false;
int r;
assert(c);
assert(i);
if (i->ignore_if_target_missing) {
r = chase(i->argument, arg_root, CHASE_SAFE|CHASE_PREFIX_ROOT|CHASE_NOFOLLOW, /* ret_path = */ NULL, /* ret_fd = */ NULL);
if (r == -ENOENT) {
/* Silently skip over lines where the source file is missing. */
log_info("Symlink source path '%s' does not exist, skipping line.", prefix_roota(arg_root, i->argument));
return 0;
}
if (r < 0)
return log_error_errno(r, "Failed to check if symlink source path '%s' exists: %m", prefix_roota(arg_root, i->argument));
}
r = path_extract_filename(i->path, &bn);
if (r < 0)
return log_error_errno(r, "Failed to extract filename from path '%s': %m", i->path);
if (r == O_DIRECTORY)
return log_error_errno(SYNTHETIC_ERRNO(EISDIR),
"Cannot open path '%s' for creating symlink, is a directory.", i->path);
if (arg_dry_run) {
log_info("Would create symlink %s -> %s", i->path, i->argument);
return 0;
}
pfd = path_open_parent_safe(i->path, i->allow_failure);
if (pfd < 0)
return pfd;
mac_selinux_create_file_prepare(i->path, S_IFLNK);
r = RET_NERRNO(symlinkat(i->argument, pfd, bn));
mac_selinux_create_file_clear();
creation = r >= 0 ? CREATION_NORMAL : CREATION_EXISTING;
fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
if (fd < 0) {
if (r < 0)
return log_error_errno(r, "Failed to create symlink '%s': %m", i->path); /* original error! */
return log_error_errno(errno, "Failed to open symlink we just created '%s': %m", i->path);
}
if (fstat(fd, &st) < 0)
return log_error_errno(errno, "Failed to fstat(%s): %m", i->path);
if (S_ISLNK(st.st_mode)) {
_cleanup_free_ char *x = NULL;
r = readlinkat_malloc(fd, "", &x);
if (r < 0)
return log_error_errno(r, "readlinkat(%s) failed: %m", i->path);
good = streq(x, i->argument);
} else
good = false;
if (!good) {
if (!i->append_or_force) {
log_debug("\"%s\" is not a symlink or does not point to the correct path.", i->path);
return 0;
}
fd = safe_close(fd);
mac_selinux_create_file_prepare(i->path, S_IFLNK);
r = symlinkat_atomic_full(i->argument, pfd, bn, /* make_relative= */ false);
mac_selinux_create_file_clear();
if (IN_SET(r, -EISDIR, -EEXIST, -ENOTEMPTY)) {
r = rm_rf_child(pfd, bn, REMOVE_PHYSICAL);
if (r < 0)
return log_error_errno(r, "rm -rf %s failed: %m", i->path);
mac_selinux_create_file_prepare(i->path, S_IFLNK);
r = RET_NERRNO(symlinkat(i->argument, pfd, i->path));
mac_selinux_create_file_clear();
}
if (r < 0)
return log_error_errno(r, "symlink(%s, %s) failed: %m", i->argument, i->path);
fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
if (fd < 0)
return log_error_errno(errno, "Failed to open symlink we just created '%s': %m", i->path);
/* Validate type before change ownership below */
if (fstat(fd, &st) < 0)
return log_error_errno(errno, "Failed to fstat(%s): %m", i->path);
if (!S_ISLNK(st.st_mode))
return log_error_errno(SYNTHETIC_ERRNO(EBADF), "Symlink we just created is not a symlink, refusing.");
creation = CREATION_FORCE;
}
log_debug("%s symlink \"%s\".", creation_mode_verb_to_string(creation), i->path);
return fd_set_perms(c, i, fd, i->path, &st, creation);
}
typedef int (*action_t)(Context *c, Item *i, const char *path, CreationMode creation);
typedef int (*fdaction_t)(Context *c, Item *i, int fd, const char *path, const struct stat *st, CreationMode creation);
static int item_do(
Context *c,
Item *i,
int fd,
const char *path,
CreationMode creation,
fdaction_t action) {
struct stat st;
int r;
assert(c);
assert(i);
assert(fd >= 0);
assert(path);
assert(action);
if (fstat(fd, &st) < 0) {
r = log_error_errno(errno, "fstat() on file failed: %m");
goto finish;
}
/* This returns the first error we run into, but nevertheless tries to go on */
r = action(c, i, fd, path, &st, creation);
if (S_ISDIR(st.st_mode)) {
_cleanup_closedir_ DIR *d = NULL;
/* The passed 'fd' was opened with O_PATH. We need to convert it into a 'regular' fd before
* reading the directory content. */
d = opendir(FORMAT_PROC_FD_PATH(fd));
if (!d) {
RET_GATHER(r, log_error_errno(errno, "Failed to opendir() '%s': %m", FORMAT_PROC_FD_PATH(fd)));
goto finish;
}
FOREACH_DIRENT_ALL(de, d, RET_GATHER(r, -errno); goto finish) {
_cleanup_close_ int de_fd = -EBADF;
_cleanup_free_ char *de_path = NULL;
if (dot_or_dot_dot(de->d_name))
continue;
de_fd = openat(fd, de->d_name, O_NOFOLLOW|O_CLOEXEC|O_PATH);
if (de_fd < 0) {
if (errno != ENOENT)
RET_GATHER(r, log_error_errno(errno, "Failed to open file '%s': %m", de->d_name));
continue;
}
de_path = path_join(path, de->d_name);
if (!de_path) {
r = log_oom();
goto finish;
}
/* Pass ownership of dirent fd over */
RET_GATHER(r, item_do(c, i, TAKE_FD(de_fd), de_path, CREATION_EXISTING, action));
}
}
finish:
safe_close(fd);
return r;
}
static int glob_item(Context *c, Item *i, action_t action) {
_cleanup_globfree_ glob_t g = {
.gl_opendir = (void *(*)(const char *)) opendir_nomod,
};
int r;
assert(c);
assert(i);
assert(action);
r = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
if (r == -ENOENT)
return 0;
if (r < 0)
return log_error_errno(r, "Failed to glob '%s': %m", i->path);
r = 0;
STRV_FOREACH(fn, g.gl_pathv)
/* We pass CREATION_EXISTING here, since if we are globbing for it, it always has to exist */
RET_GATHER(r, action(c, i, *fn, CREATION_EXISTING));
return r;
}
static int glob_item_recursively(
Context *c,
Item *i,
fdaction_t action) {
_cleanup_globfree_ glob_t g = {
.gl_opendir = (void *(*)(const char *)) opendir_nomod,
};
int r;
assert(c);
assert(i);
assert(action);
r = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
if (r == -ENOENT)
return 0;
if (r < 0)
return log_error_errno(r, "Failed to glob '%s': %m", i->path);
r = 0;
STRV_FOREACH(fn, g.gl_pathv) {
_cleanup_close_ int fd = -EBADF;
/* Make sure we won't trigger/follow file object (such as device nodes, automounts, ...)
* pointed out by 'fn' with O_PATH. Note, when O_PATH is used, flags other than
* O_CLOEXEC, O_DIRECTORY, and O_NOFOLLOW are ignored. */
fd = open(*fn, O_CLOEXEC|O_NOFOLLOW|O_PATH);
if (fd < 0) {
RET_GATHER(r, log_error_errno(errno, "Failed to open '%s': %m", *fn));
continue;
}
RET_GATHER(r, item_do(c, i, TAKE_FD(fd), *fn, CREATION_EXISTING, action));
}
return r;
}
static int rm_if_wrong_type_safe(
mode_t mode,
int parent_fd,
const struct stat *parent_st, /* Only used if follow_links below is true. */
const char *name,
int flags) {
_cleanup_free_ char *parent_name = NULL;
bool follow_links = !FLAGS_SET(flags, AT_SYMLINK_NOFOLLOW);
struct stat st;
int r;
assert(name);
assert((mode & ~S_IFMT) == 0);
assert(!follow_links || parent_st);
assert((flags & ~AT_SYMLINK_NOFOLLOW) == 0);
if (mode == 0)
return 0;
if (!filename_is_valid(name))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "\"%s\" is not a valid filename.", name);
r = fstatat_harder(parent_fd, name, &st, flags, REMOVE_CHMOD | REMOVE_CHMOD_RESTORE);
if (r < 0) {
(void) fd_get_path(parent_fd, &parent_name);
return log_full_errno(r == -ENOENT ? LOG_DEBUG : LOG_ERR, r,
"Failed to stat \"%s/%s\": %m", parent_name ?: "...", name);
}
/* Fail before removing anything if this is an unsafe transition. */
if (follow_links && unsafe_transition(parent_st, &st)) {
(void) fd_get_path(parent_fd, &parent_name);
return log_error_errno(SYNTHETIC_ERRNO(ENOLINK),
"Unsafe transition from \"%s\" to \"%s\".", parent_name ?: "...", name);
}
if ((st.st_mode & S_IFMT) == mode)
return 0;
(void) fd_get_path(parent_fd, &parent_name);
log_notice("Wrong file type 0o%o; rm -rf \"%s/%s\"", st.st_mode & S_IFMT, parent_name ?: "...", name);
/* If the target of the symlink was the wrong type, the link needs to be removed instead of the
* target, so make sure it is identified as a link and not a directory. */
if (follow_links) {
r = fstatat_harder(parent_fd, name, &st, AT_SYMLINK_NOFOLLOW, REMOVE_CHMOD | REMOVE_CHMOD_RESTORE);
if (r < 0)
return log_error_errno(r, "Failed to stat \"%s/%s\": %m", parent_name ?: "...", name);
}
/* Do not remove mount points. */
r = is_mount_point_at(parent_fd, name, follow_links ? AT_SYMLINK_FOLLOW : 0);
if (r < 0)
(void) log_warning_errno(r, "Failed to check if \"%s/%s\" is a mount point: %m; continuing.",
parent_name ?: "...", name);
else if (r > 0)
return log_error_errno(SYNTHETIC_ERRNO(EBUSY),
"Not removing \"%s/%s\" because it is a mount point.", parent_name ?: "...", name);
log_action("Would remove", "Removing", "%s %s/%s", parent_name ?: "...", name);
if (!arg_dry_run) {
if ((st.st_mode & S_IFMT) == S_IFDIR) {
_cleanup_close_ int child_fd = -EBADF;
child_fd = openat(parent_fd, name, O_NOCTTY | O_CLOEXEC | O_DIRECTORY);
if (child_fd < 0)
return log_error_errno(errno, "Failed to open \"%s/%s\": %m", parent_name ?: "...", name);
r = rm_rf_children(TAKE_FD(child_fd), REMOVE_ROOT|REMOVE_SUBVOLUME|REMOVE_PHYSICAL, &st);
if (r < 0)
return log_error_errno(r, "Failed to remove contents of \"%s/%s\": %m", parent_name ?: "...", name);
r = unlinkat_harder(parent_fd, name, AT_REMOVEDIR, REMOVE_CHMOD | REMOVE_CHMOD_RESTORE);
} else
r = unlinkat_harder(parent_fd, name, 0, REMOVE_CHMOD | REMOVE_CHMOD_RESTORE);
if (r < 0)
return log_error_errno(r, "Failed to remove \"%s/%s\": %m", parent_name ?: "...", name);
}
/* This is covered by the log_notice "Wrong file type...".
* It is logged earlier because it gives context to other error messages that might follow. */
return -ENOENT;
}
/* If child_mode is non-zero, rm_if_wrong_type_safe will be executed for the last path component. */
static int mkdir_parents_rm_if_wrong_type(mode_t child_mode, const char *path) {
_cleanup_close_ int parent_fd = -EBADF;
struct stat parent_st;
size_t path_len;
int r;
assert(path);
assert((child_mode & ~S_IFMT) == 0);
path_len = strlen(path);
if (!is_path(path))
/* rm_if_wrong_type_safe already logs errors. */
return rm_if_wrong_type_safe(child_mode, AT_FDCWD, NULL, path, AT_SYMLINK_NOFOLLOW);
if (child_mode != 0 && endswith(path, "/"))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Trailing path separators are only allowed if child_mode is not set; got \"%s\"", path);
/* Get the parent_fd and stat. */
parent_fd = openat(AT_FDCWD, path_is_absolute(path) ? "/" : ".", O_NOCTTY | O_CLOEXEC | O_DIRECTORY);
if (parent_fd < 0)
return log_error_errno(errno, "Failed to open root: %m");
if (fstat(parent_fd, &parent_st) < 0)
return log_error_errno(errno, "Failed to stat root: %m");
/* Check every parent directory in the path, except the last component */
for (const char *e = path;;) {
_cleanup_close_ int next_fd = -EBADF;
char t[path_len + 1];
const char *s;
/* Find the start of the next path component. */
s = e + strspn(e, "/");
/* Find the end of the next path component. */
e = s + strcspn(s, "/");
/* Copy the path component to t so it can be a null terminated string. */
*mempcpy_typesafe(t, s, e - s) = 0;
/* Is this the last component? If so, then check the type */
if (*e == 0)
return rm_if_wrong_type_safe(child_mode, parent_fd, &parent_st, t, AT_SYMLINK_NOFOLLOW);
r = rm_if_wrong_type_safe(S_IFDIR, parent_fd, &parent_st, t, 0);
/* Remove dangling symlinks. */
if (r == -ENOENT)
r = rm_if_wrong_type_safe(S_IFDIR, parent_fd, &parent_st, t, AT_SYMLINK_NOFOLLOW);
if (r == -ENOENT) {
if (!arg_dry_run) {
WITH_UMASK(0000)
r = mkdirat_label(parent_fd, t, 0755);
if (r < 0) {
_cleanup_free_ char *parent_name = NULL;
(void) fd_get_path(parent_fd, &parent_name);
return log_error_errno(r, "Failed to mkdir \"%s\" at \"%s\": %m", t, strnull(parent_name));
}
}
} else if (r < 0)
/* rm_if_wrong_type_safe already logs errors. */
return r;
next_fd = RET_NERRNO(openat(parent_fd, t, O_NOCTTY | O_CLOEXEC | O_DIRECTORY));
if (next_fd < 0) {
_cleanup_free_ char *parent_name = NULL;
(void) fd_get_path(parent_fd, &parent_name);
return log_error_errno(next_fd, "Failed to open \"%s\" at \"%s\": %m", t, strnull(parent_name));
}
r = RET_NERRNO(fstat(next_fd, &parent_st));
if (r < 0) {
_cleanup_free_ char *parent_name = NULL;
(void) fd_get_path(parent_fd, &parent_name);
return log_error_errno(r, "Failed to stat \"%s\" at \"%s\": %m", t, strnull(parent_name));
}
close_and_replace(parent_fd, next_fd);
}
}
static int mkdir_parents_item(Item *i, mode_t child_mode) {
int r;
if (i->try_replace) {
r = mkdir_parents_rm_if_wrong_type(child_mode, i->path);
if (r < 0 && r != -ENOENT)
return r;
} else
WITH_UMASK(0000)
if (!arg_dry_run)
(void) mkdir_parents_label(i->path, 0755);
return 0;
}
static int create_item(Context *c, Item *i) {
int r;
assert(c);
assert(i);
log_debug("Running create action for entry %c %s", (char) i->type, i->path);
switch (i->type) {
case IGNORE_PATH:
case IGNORE_DIRECTORY_PATH:
case REMOVE_PATH:
case RECURSIVE_REMOVE_PATH:
return 0;
case TRUNCATE_FILE:
case CREATE_FILE:
r = mkdir_parents_item(i, S_IFREG);
if (r < 0)
return r;
if ((i->type == CREATE_FILE && i->append_or_force) || i->type == TRUNCATE_FILE)
r = truncate_file(c, i, i->path);
else
r = create_file(c, i, i->path);
if (r < 0)
return r;
break;
case COPY_FILES:
r = mkdir_parents_item(i, 0);
if (r < 0)
return r;
r = copy_files(c, i);
if (r < 0)
return r;
break;
case WRITE_FILE:
r = glob_item(c, i, write_one_file);
if (r < 0)
return r;
break;
case CREATE_DIRECTORY:
case TRUNCATE_DIRECTORY:
r = mkdir_parents_item(i, S_IFDIR);
if (r < 0)
return r;
r = create_directory(c, i, i->path);
if (r < 0)
return r;
break;
case CREATE_SUBVOLUME:
case CREATE_SUBVOLUME_INHERIT_QUOTA:
case CREATE_SUBVOLUME_NEW_QUOTA:
r = mkdir_parents_item(i, S_IFDIR);
if (r < 0)
return r;
r = create_subvolume(c, i, i->path);
if (r < 0)
return r;
break;
case EMPTY_DIRECTORY:
r = glob_item(c, i, empty_directory);
if (r < 0)
return r;
break;
case CREATE_FIFO:
r = mkdir_parents_item(i, S_IFIFO);
if (r < 0)
return r;
r = create_fifo(c, i);
if (r < 0)
return r;
break;
case CREATE_SYMLINK:
r = mkdir_parents_item(i, S_IFLNK);
if (r < 0)
return r;
r = create_symlink(c, i);
if (r < 0)
return r;
break;
case CREATE_BLOCK_DEVICE:
case CREATE_CHAR_DEVICE:
if (have_effective_cap(CAP_MKNOD) <= 0) {
/* In a container we lack CAP_MKNOD. We shouldn't attempt to create the device node in that
* case to avoid noise, and we don't support virtualized devices in containers anyway. */
log_debug("We lack CAP_MKNOD, skipping creation of device node %s.", i->path);
return 0;
}
r = mkdir_parents_item(i, i->type == CREATE_BLOCK_DEVICE ? S_IFBLK : S_IFCHR);
if (r < 0)
return r;
r = create_device(c, i, i->type == CREATE_BLOCK_DEVICE ? S_IFBLK : S_IFCHR);
if (r < 0)
return r;
break;
case ADJUST_MODE:
case RELABEL_PATH:
r = glob_item(c, i, path_set_perms);
if (r < 0)
return r;
break;
case RECURSIVE_RELABEL_PATH:
r = glob_item_recursively(c, i, fd_set_perms);
if (r < 0)
return r;
break;
case SET_XATTR:
r = glob_item(c, i, path_set_xattrs);
if (r < 0)
return r;
break;
case RECURSIVE_SET_XATTR:
r = glob_item_recursively(c, i, fd_set_xattrs);
if (r < 0)
return r;
break;
case SET_ACL:
r = glob_item(c, i, path_set_acls);
if (r < 0)
return r;
break;
case RECURSIVE_SET_ACL:
r = glob_item_recursively(c, i, fd_set_acls);
if (r < 0)
return r;
break;
case SET_ATTRIBUTE:
r = glob_item(c, i, path_set_attribute);
if (r < 0)
return r;
break;
case RECURSIVE_SET_ATTRIBUTE:
r = glob_item_recursively(c, i, fd_set_attribute);
if (r < 0)
return r;
break;
}
return 0;
}
static int remove_recursive(
Context *c,
Item *i,
const char *instance,
bool remove_instance) {
_cleanup_closedir_ DIR *d = NULL;
STRUCT_STATX_DEFINE(sx);
bool mountpoint;
int r;
r = opendir_and_stat(instance, &d, &sx, &mountpoint);
if (r < 0)
return r;
if (r == 0) {
if (remove_instance) {
log_action("Would remove", "Removing", "%s file \"%s\".", instance);
if (!arg_dry_run &&
remove(instance) < 0 &&
errno != ENOENT)
return log_error_errno(errno, "rm %s: %m", instance);
}
return 0;
}
r = dir_cleanup(c, i, instance, d,
/* self_atime_nsec= */ NSEC_INFINITY,
/* self_mtime_nsec= */ NSEC_INFINITY,
/* cutoff_nsec= */ NSEC_INFINITY,
sx.stx_dev_major, sx.stx_dev_minor,
mountpoint,
MAX_DEPTH,
/* keep_this_level= */ false,
/* age_by_file= */ 0,
/* age_by_dir= */ 0);
if (r < 0)
return r;
if (remove_instance) {
log_action("Would remove", "Removing", "%s directory \"%s\".", instance);
if (!arg_dry_run) {
r = RET_NERRNO(rmdir(instance));
if (r < 0) {
bool fatal = !IN_SET(r, -ENOENT, -ENOTEMPTY);
log_full_errno(fatal ? LOG_ERR : LOG_DEBUG, r, "Failed to remove %s: %m", instance);
if (fatal)
return r;
}
}
}
return 0;
}
static int purge_item_instance(Context *c, Item *i, const char *instance, CreationMode creation) {
return remove_recursive(c, i, instance, /* remove_instance= */ true);
}
static int purge_item(Context *c, Item *i) {
assert(i);
if (!needs_purge(i->type))
return 0;
if (!i->purge)
return 0;
log_debug("Running purge action for entry %c %s", (char) i->type, i->path);
if (needs_glob(i->type))
return glob_item(c, i, purge_item_instance);
return purge_item_instance(c, i, i->path, CREATION_EXISTING);
}
static int remove_item_instance(
Context *c,
Item *i,
const char *instance,
CreationMode creation) {
assert(c);
assert(i);
switch (i->type) {
case REMOVE_PATH:
log_action("Would remove", "Removing", "%s \"%s\".", instance);
if (!arg_dry_run &&
remove(instance) < 0 &&
errno != ENOENT)
return log_error_errno(errno, "rm %s: %m", instance);
return 0;
case RECURSIVE_REMOVE_PATH:
return remove_recursive(c, i, instance, /* remove_instance= */ true);
default:
assert_not_reached();
}
}
static int remove_item(Context *c, Item *i) {
assert(c);
assert(i);
log_debug("Running remove action for entry %c %s", (char) i->type, i->path);
switch (i->type) {
case TRUNCATE_DIRECTORY:
return remove_recursive(c, i, i->path, /* remove_instance= */ false);
case REMOVE_PATH:
case RECURSIVE_REMOVE_PATH:
return glob_item(c, i, remove_item_instance);
default:
return 0;
}
}
static char *age_by_to_string(AgeBy ab, bool is_dir) {
static const char ab_map[] = { 'a', 'b', 'c', 'm' };
size_t j = 0;
char *ret;
ret = new(char, ELEMENTSOF(ab_map) + 1);
if (!ret)
return NULL;
for (size_t i = 0; i < ELEMENTSOF(ab_map); i++)
if (BIT_SET(ab, i))
ret[j++] = is_dir ? ascii_toupper(ab_map[i]) : ab_map[i];
ret[j] = 0;
return ret;
}
static int clean_item_instance(
Context *c,
Item *i,
const char* instance,
CreationMode creation) {
assert(i);
if (!i->age_set)
return 0;
usec_t n = now(CLOCK_REALTIME);
if (n < i->age)
return 0;
usec_t cutoff = n - i->age;
_cleanup_closedir_ DIR *d = NULL;
STRUCT_STATX_DEFINE(sx);
bool mountpoint;
int r;
r = opendir_and_stat(instance, &d, &sx, &mountpoint);
if (r <= 0)
return r;
if (DEBUG_LOGGING) {
_cleanup_free_ char *ab_f = NULL, *ab_d = NULL;
ab_f = age_by_to_string(i->age_by_file, false);
if (!ab_f)
return log_oom();
ab_d = age_by_to_string(i->age_by_dir, true);
if (!ab_d)
return log_oom();
log_debug("Cleanup threshold for %s \"%s\" is %s; age-by: %s%s",
mountpoint ? "mount point" : "directory",
instance,
FORMAT_TIMESTAMP_STYLE(cutoff, TIMESTAMP_US),
ab_f, ab_d);
}
return dir_cleanup(c, i, instance, d,
statx_timestamp_load_nsec(&sx.stx_atime),
statx_timestamp_load_nsec(&sx.stx_mtime),
cutoff * NSEC_PER_USEC,
sx.stx_dev_major, sx.stx_dev_minor,
mountpoint,
MAX_DEPTH, i->keep_first_level,
i->age_by_file, i->age_by_dir);
}
static int clean_item(Context *c, Item *i) {
assert(c);
assert(i);
log_debug("Running clean action for entry %c %s", (char) i->type, i->path);
switch (i->type) {
case CREATE_DIRECTORY:
case TRUNCATE_DIRECTORY:
case CREATE_SUBVOLUME:
case CREATE_SUBVOLUME_INHERIT_QUOTA:
case CREATE_SUBVOLUME_NEW_QUOTA:
case COPY_FILES:
clean_item_instance(c, i, i->path, CREATION_EXISTING);
return 0;
case EMPTY_DIRECTORY:
case IGNORE_PATH:
case IGNORE_DIRECTORY_PATH:
return glob_item(c, i, clean_item_instance);
default:
return 0;
}
}
static int process_item(
Context *c,
Item *i,
OperationMask operation) {
OperationMask todo;
_cleanup_free_ char *_path = NULL;
const char *path;
int r;
assert(c);
assert(i);
todo = operation & ~i->done;
if (todo == 0) /* Everything already done? */
return 0;
i->done |= operation;
path = i->path;
if (string_is_glob(path)) {
/* We can't easily check whether a glob matches any autofs path, so let's do the check only
* for the non-glob part. */
r = glob_non_glob_prefix(path, &_path);
if (r < 0 && r != -ENOENT)
return log_debug_errno(r, "Failed to deglob path: %m");
if (r >= 0)
path = _path;
}
r = chase(path, arg_root, CHASE_NO_AUTOFS|CHASE_NONEXISTENT|CHASE_WARN, NULL, NULL);
if (r == -EREMOTE) {
log_notice_errno(r, "Skipping %s", i->path); /* We log the configured path, to not confuse the user. */
return 0;
}
if (r < 0)
log_debug_errno(r, "Failed to determine whether '%s' is below autofs, ignoring: %m", i->path);
r = FLAGS_SET(operation, OPERATION_CREATE) ? create_item(c, i) : 0;
/* Failure can only be tolerated for create */
if (i->allow_failure)
r = 0;
RET_GATHER(r, FLAGS_SET(operation, OPERATION_REMOVE) ? remove_item(c, i) : 0);
RET_GATHER(r, FLAGS_SET(operation, OPERATION_CLEAN) ? clean_item(c, i) : 0);
RET_GATHER(r, FLAGS_SET(operation, OPERATION_PURGE) ? purge_item(c, i) : 0);
return r;
}
static int process_item_array(
Context *c,
ItemArray *array,
OperationMask operation) {
int r = 0;
assert(c);
assert(array);
/* Create any parent first. */
if (FLAGS_SET(operation, OPERATION_CREATE) && array->parent)
r = process_item_array(c, array->parent, operation & OPERATION_CREATE);
/* Clean up all children first */
if ((operation & (OPERATION_REMOVE|OPERATION_CLEAN|OPERATION_PURGE)) && !set_isempty(array->children)) {
ItemArray *cc;
SET_FOREACH(cc, array->children)
RET_GATHER(r, process_item_array(c, cc, operation & (OPERATION_REMOVE|OPERATION_CLEAN|OPERATION_PURGE)));
}
FOREACH_ARRAY(item, array->items, array->n_items)
RET_GATHER(r, process_item(c, item, operation));
return r;
}
static void item_free_contents(Item *i) {
assert(i);
free(i->path);
free(i->argument);
free(i->binary_argument);
strv_free(i->xattrs);
#if HAVE_ACL
if (i->acl_access)
acl_free(i->acl_access);
if (i->acl_access_exec)
acl_free(i->acl_access_exec);
if (i->acl_default)
acl_free(i->acl_default);
#endif
}
static ItemArray* item_array_free(ItemArray *a) {
if (!a)
return NULL;
FOREACH_ARRAY(item, a->items, a->n_items)
item_free_contents(item);
set_free(a->children);
free(a->items);
return mfree(a);
}
static int item_compare(const Item *a, const Item *b) {
/* Make sure that the ownership taking item is put first, so
* that we first create the node, and then can adjust it */
if (takes_ownership(a->type) && !takes_ownership(b->type))
return -1;
if (!takes_ownership(a->type) && takes_ownership(b->type))
return 1;
return CMP(a->type, b->type);
}
static bool item_compatible(const Item *a, const Item *b) {
assert(a);
assert(b);
assert(streq(a->path, b->path));
if (takes_ownership(a->type) && takes_ownership(b->type))
/* check if the items are the same */
return memcmp_nn(item_binary_argument(a), item_binary_argument_size(a),
item_binary_argument(b), item_binary_argument_size(b)) == 0 &&
a->uid_set == b->uid_set &&
a->uid == b->uid &&
a->uid_only_create == b->uid_only_create &&
a->gid_set == b->gid_set &&
a->gid == b->gid &&
a->gid_only_create == b->gid_only_create &&
a->mode_set == b->mode_set &&
a->mode == b->mode &&
a->mode_only_create == b->mode_only_create &&
a->age_set == b->age_set &&
a->age == b->age &&
a->age_by_file == b->age_by_file &&
a->age_by_dir == b->age_by_dir &&
a->mask_perms == b->mask_perms &&
a->keep_first_level == b->keep_first_level &&
a->major_minor == b->major_minor;
return true;
}
static bool should_include_path(const char *path) {
STRV_FOREACH(prefix, arg_exclude_prefixes)
if (path_startswith(path, *prefix)) {
log_debug("Entry \"%s\" matches exclude prefix \"%s\", skipping.",
path, *prefix);
return false;
}
STRV_FOREACH(prefix, arg_include_prefixes)
if (path_startswith(path, *prefix)) {
log_debug("Entry \"%s\" matches include prefix \"%s\".", path, *prefix);
return true;
}
/* no matches, so we should include this path only if we have no allow list at all */
if (strv_isempty(arg_include_prefixes))
return true;
log_debug("Entry \"%s\" does not match any include prefix, skipping.", path);
return false;
}
static int specifier_expansion_from_arg(const Specifier *specifier_table, Item *i) {
int r;
assert(i);
if (!i->argument)
return 0;
switch (i->type) {
case COPY_FILES:
case CREATE_SYMLINK:
case CREATE_FILE:
case TRUNCATE_FILE:
case WRITE_FILE: {
_cleanup_free_ char *unescaped = NULL, *resolved = NULL;
ssize_t l;
l = cunescape(i->argument, 0, &unescaped);
if (l < 0)
return log_error_errno(l, "Failed to unescape parameter to write: %s", i->argument);
r = specifier_printf(unescaped, PATH_MAX-1, specifier_table, arg_root, NULL, &resolved);
if (r < 0)
return r;
return free_and_replace(i->argument, resolved);
}
case SET_XATTR:
case RECURSIVE_SET_XATTR:
STRV_FOREACH(xattr, i->xattrs) {
_cleanup_free_ char *resolved = NULL;
r = specifier_printf(*xattr, SIZE_MAX, specifier_table, arg_root, NULL, &resolved);
if (r < 0)
return r;
free_and_replace(*xattr, resolved);
}
return 0;
default:
return 0;
}
}
static int patch_var_run(const char *fname, unsigned line, char **path) {
const char *k;
char *n;
assert(path);
assert(*path);
/* Optionally rewrites lines referencing /var/run/, to use /run/ instead. Why bother? tmpfiles merges
* lines in some cases and detects conflicts in others. If files/directories are specified through
* two equivalent lines this is problematic as neither case will be detected. Ideally we'd detect
* these cases by resolving symlinks early, but that's precisely not what we can do here as this code
* very likely is running very early on, at a time where the paths in question are not available yet,
* or even more importantly, our own tmpfiles rules might create the paths that are intermediary to
* the listed paths. We can't really cover the generic case, but the least we can do is cover the
* specific case of /var/run vs. /run, as /var/run is a legacy name for /run only, and we explicitly
* document that and require that on systemd systems the former is a symlink to the latter. Moreover
* files below this path are by far the primary use case for tmpfiles.d/. */
k = path_startswith(*path, "/var/run/");
if (isempty(k)) /* Don't complain about paths other than under /var/run,
* and not about /var/run itself either. */
return 0;
n = path_join("/run", k);
if (!n)
return log_oom();
/* Also log about this briefly. We do so at LOG_NOTICE level, as we fixed up the situation
* automatically, hence there's no immediate need for action by the user. However, in the interest of
* making things less confusing to the user, let's still inform the user that these snippets should
* really be updated. */
log_syntax(NULL, LOG_NOTICE, fname, line, 0,
"Line references path below legacy directory /var/run/, updating %s → %s; please update the tmpfiles.d/ drop-in file accordingly.",
*path, n);
free_and_replace(*path, n);
return 0;
}
static int find_uid(const char *user, uid_t *ret_uid, Hashmap **cache) {
int r;
assert(user);
assert(ret_uid);
/* First: parse as numeric UID string */
r = parse_uid(user, ret_uid);
if (r >= 0)
return r;
/* Second: pass to NSS if we are running "online" */
if (!arg_root)
return get_user_creds(&user, ret_uid, NULL, NULL, NULL, 0);
/* Third, synthesize "root" unconditionally */
if (streq(user, "root")) {
*ret_uid = 0;
return 0;
}
/* Fourth: use fgetpwent() to read /etc/passwd directly, if we are "offline" */
return name_to_uid_offline(arg_root, user, ret_uid, cache);
}
static int find_gid(const char *group, gid_t *ret_gid, Hashmap **cache) {
int r;
assert(group);
assert(ret_gid);
/* First: parse as numeric GID string */
r = parse_gid(group, ret_gid);
if (r >= 0)
return r;
/* Second: pass to NSS if we are running "online" */
if (!arg_root)
return get_group_creds(&group, ret_gid, 0);
/* Third, synthesize "root" unconditionally */
if (streq(group, "root")) {
*ret_gid = 0;
return 0;
}
/* Fourth: use fgetgrent() to read /etc/group directly, if we are "offline" */
return name_to_gid_offline(arg_root, group, ret_gid, cache);
}
static int parse_age_by_from_arg(const char *age_by_str, Item *item) {
AgeBy ab_f = 0, ab_d = 0;
static const struct {
char age_by_chr;
AgeBy age_by_flag;
} age_by_types[] = {
{ 'a', AGE_BY_ATIME },
{ 'b', AGE_BY_BTIME },
{ 'c', AGE_BY_CTIME },
{ 'm', AGE_BY_MTIME },
};
assert(age_by_str);
assert(item);
if (isempty(age_by_str))
return -EINVAL;
for (const char *s = age_by_str; *s != 0; s++) {
size_t i;
/* Ignore whitespace. */
if (strchr(WHITESPACE, *s))
continue;
for (i = 0; i < ELEMENTSOF(age_by_types); i++) {
/* Check lower-case for files, upper-case for directories. */
if (*s == age_by_types[i].age_by_chr) {
ab_f |= age_by_types[i].age_by_flag;
break;
} else if (*s == ascii_toupper(age_by_types[i].age_by_chr)) {
ab_d |= age_by_types[i].age_by_flag;
break;
}
}
/* Invalid character. */
if (i >= ELEMENTSOF(age_by_types))
return -EINVAL;
}
/* No match. */
if (ab_f == 0 && ab_d == 0)
return -EINVAL;
item->age_by_file = ab_f > 0 ? ab_f : AGE_BY_DEFAULT_FILE;
item->age_by_dir = ab_d > 0 ? ab_d : AGE_BY_DEFAULT_DIR;
return 0;
}
static bool is_duplicated_item(ItemArray *existing, const Item *i) {
assert(existing);
assert(i);
FOREACH_ARRAY(e, existing->items, existing->n_items) {
if (item_compatible(e, i))
continue;
/* Only multiple 'w+' lines for the same path are allowed. */
if (e->type != WRITE_FILE || !e->append_or_force ||
i->type != WRITE_FILE || !i->append_or_force)
return true;
}
return false;
}
static int parse_line(
const char *fname,
unsigned line,
const char *buffer,
bool *invalid_config,
void *context) {
Context *c = ASSERT_PTR(context);
_cleanup_free_ char *action = NULL, *mode = NULL, *user = NULL, *group = NULL, *age = NULL, *path = NULL;
_cleanup_(item_free_contents) Item i = {
/* The "age-by" argument considers all file timestamp types by default. */
.age_by_file = AGE_BY_DEFAULT_FILE,
.age_by_dir = AGE_BY_DEFAULT_DIR,
};
ItemArray *existing;
OrderedHashmap *h;
bool append_or_force = false, boot = false, allow_failure = false, try_replace = false,
unbase64 = false, from_cred = false, missing_user_or_group = false, purge = false,
ignore_if_target_missing = false;
int r;
assert(fname);
assert(line >= 1);
assert(buffer);
const Specifier specifier_table[] = {
{ 'h', specifier_user_home, NULL },
{ 'C', specifier_directory, UINT_TO_PTR(DIRECTORY_CACHE) },
{ 'L', specifier_directory, UINT_TO_PTR(DIRECTORY_LOGS) },
{ 'S', specifier_directory, UINT_TO_PTR(DIRECTORY_STATE) },
{ 't', specifier_directory, UINT_TO_PTR(DIRECTORY_RUNTIME) },
COMMON_SYSTEM_SPECIFIERS,
COMMON_CREDS_SPECIFIERS(arg_runtime_scope),
COMMON_TMP_SPECIFIERS,
{}
};
r = extract_many_words(
&buffer,
NULL,
EXTRACT_UNQUOTE | EXTRACT_CUNESCAPE,
&action,
&path,
&mode,
&user,
&group,
&age);
if (r < 0) {
if (IN_SET(r, -EINVAL, -EBADSLT))
/* invalid quoting and such or an unknown specifier */
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to parse line: %m");
} else if (r < 2) {
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Syntax error.");
}
if (!empty_or_dash(buffer)) {
i.argument = strdup(buffer);
if (!i.argument)
return log_oom();
}
if (isempty(action)) {
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
"Command too short '%s'.", action);
}
for (int pos = 1; action[pos]; pos++)
if (action[pos] == '!' && !boot)
boot = true;
else if (action[pos] == '+' && !append_or_force)
append_or_force = true;
else if (action[pos] == '-' && !allow_failure)
allow_failure = true;
else if (action[pos] == '=' && !try_replace)
try_replace = true;
else if (action[pos] == '~' && !unbase64)
unbase64 = true;
else if (action[pos] == '^' && !from_cred)
from_cred = true;
else if (action[pos] == '$' && !purge)
purge = true;
else if (action[pos] == '?' && !ignore_if_target_missing)
ignore_if_target_missing = true;
else {
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
"Unknown modifiers in command: %s", action);
}
if (boot && !arg_boot) {
log_syntax(NULL, LOG_DEBUG, fname, line, 0,
"Ignoring entry %s \"%s\" because --boot is not specified.", action, path);
return 0;
}
i.type = action[0];
i.append_or_force = append_or_force;
i.allow_failure = allow_failure;
i.try_replace = try_replace;
i.purge = purge;
i.ignore_if_target_missing = ignore_if_target_missing;
r = specifier_printf(path, PATH_MAX-1, specifier_table, arg_root, NULL, &i.path);
if (ERRNO_IS_NEG_NOINFO(r))
return log_unresolvable_specifier(fname, line);
if (r < 0) {
if (IN_SET(r, -EINVAL, -EBADSLT))
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, r,
"Failed to replace specifiers in '%s': %m", path);
}
r = patch_var_run(fname, line, &i.path);
if (r < 0)
return r;
if (!path_is_absolute(i.path)) {
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
"Path '%s' not absolute.", i.path);
}
path_simplify(i.path);
switch (i.type) {
case CREATE_DIRECTORY:
case CREATE_SUBVOLUME:
case CREATE_SUBVOLUME_INHERIT_QUOTA:
case CREATE_SUBVOLUME_NEW_QUOTA:
case EMPTY_DIRECTORY:
case TRUNCATE_DIRECTORY:
case CREATE_FIFO:
case IGNORE_PATH:
case IGNORE_DIRECTORY_PATH:
case REMOVE_PATH:
case RECURSIVE_REMOVE_PATH:
case ADJUST_MODE:
case RELABEL_PATH:
case RECURSIVE_RELABEL_PATH:
if (i.argument)
log_syntax(NULL, LOG_WARNING, fname, line, 0,
"%c lines don't take argument fields, ignoring.", (char) i.type);
break;
case CREATE_FILE:
case TRUNCATE_FILE:
break;
case CREATE_SYMLINK:
if (unbase64) {
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
"base64 decoding not supported for symlink targets.");
}
break;
case WRITE_FILE:
if (!i.argument) {
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
"Write file requires argument.");
}
break;
case COPY_FILES:
if (unbase64) {
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
"base64 decoding not supported for copy sources.");
}
break;
case CREATE_CHAR_DEVICE:
case CREATE_BLOCK_DEVICE:
if (unbase64) {
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
"base64 decoding not supported for device node creation.");
}
if (!i.argument) {
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
"Device file requires argument.");
}
r = parse_devnum(i.argument, &i.major_minor);
if (r < 0) {
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, r,
"Can't parse device file major/minor '%s'.", i.argument);
}
break;
case SET_XATTR:
case RECURSIVE_SET_XATTR:
if (unbase64) {
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
"base64 decoding not supported for extended attributes.");
}
if (!i.argument) {
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
"Set extended attribute requires argument.");
}
r = parse_xattrs_from_arg(&i);
if (r < 0)
return r;
break;
case SET_ACL:
case RECURSIVE_SET_ACL:
if (unbase64) {
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
"base64 decoding not supported for ACLs.");
}
if (!i.argument) {
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
"Set ACLs requires argument.");
}
r = parse_acls_from_arg(&i);
if (r < 0)
return r;
break;
case SET_ATTRIBUTE:
case RECURSIVE_SET_ATTRIBUTE:
if (unbase64) {
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
"base64 decoding not supported for file attributes.");
}
if (!i.argument) {
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
"Set file attribute requires argument.");
}
r = parse_attribute_from_arg(&i);
if (IN_SET(r, -EINVAL, -EBADSLT))
*invalid_config = true;
if (r < 0)
return r;
break;
default:
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
"Unknown command type '%c'.", (char) i.type);
}
if (i.purge && !needs_purge(i.type)) {
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
"Purge flag '$' combined with line type '%c' which does not support purging.", (char) i.type);
}
if (i.ignore_if_target_missing && !supports_ignore_if_target_missing(i.type)) {
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
"Modifier '?' combined with line type '%c' which does not support this modifier.", (char) i.type);
}
if (!should_include_path(i.path))
return 0;
if (!unbase64) {
/* Do specifier expansion except if base64 mode is enabled */
r = specifier_expansion_from_arg(specifier_table, &i);
if (ERRNO_IS_NEG_NOINFO(r))
return log_unresolvable_specifier(fname, line);
if (r < 0) {
if (IN_SET(r, -EINVAL, -EBADSLT))
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, r,
"Failed to substitute specifiers in argument: %m");
}
}
switch (i.type) {
case CREATE_SYMLINK:
if (!i.argument) {
i.argument = path_join("/usr/share/factory", i.path);
if (!i.argument)
return log_oom();
}
break;
case COPY_FILES:
if (!i.argument) {
i.argument = path_join("/usr/share/factory", i.path);
if (!i.argument)
return log_oom();
} else if (!path_is_absolute(i.argument)) {
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
"Source path '%s' is not absolute.", i.argument);
}
if (!empty_or_root(arg_root)) {
char *p;
p = path_join(arg_root, i.argument);
if (!p)
return log_oom();
free_and_replace(i.argument, p);
}
path_simplify(i.argument);
if (access_nofollow(i.argument, F_OK) == -ENOENT) {
/* Silently skip over lines where the source file is missing. */
log_syntax(NULL, LOG_DEBUG, fname, line, 0,
"Copy source path '%s' does not exist, skipping line.", i.argument);
return 0;
}
break;
default:
break;
}
if (from_cred) {
if (!i.argument)
return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EINVAL),
"Reading from credential requested, but no credential name specified.");
if (!credential_name_valid(i.argument))
return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EINVAL),
"Credential name not valid: %s", i.argument);
r = read_credential(i.argument, &i.binary_argument, &i.binary_argument_size);
if (IN_SET(r, -ENXIO, -ENOENT)) {
/* Silently skip over lines that have no credentials passed */
log_syntax(NULL, LOG_DEBUG, fname, line, 0,
"Credential '%s' not specified, skipping line.", i.argument);
return 0;
}
if (r < 0)
return log_error_errno(r, "Failed to read credential '%s': %m", i.argument);
}
/* If base64 decoding is requested, do so now */
if (unbase64 && item_binary_argument(&i)) {
_cleanup_free_ void *data = NULL;
size_t data_size = 0;
r = unbase64mem_full(item_binary_argument(&i), item_binary_argument_size(&i), /* secure = */ false,
&data, &data_size);
if (r < 0)
return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to base64 decode specified argument '%s': %m", i.argument);
free_and_replace(i.binary_argument, data);
i.binary_argument_size = data_size;
}
if (!empty_or_root(arg_root)) {
char *p;
p = path_join(arg_root, i.path);
if (!p)
return log_oom();
free_and_replace(i.path, p);
}
if (!empty_or_dash(user)) {
const char *u;
u = startswith(user, ":");
if (u)
i.uid_only_create = true;
else
u = user;
r = find_uid(u, &i.uid, &c->uid_cache);
if (r == -ESRCH && arg_graceful) {
log_syntax(NULL, LOG_DEBUG, fname, line, r,
"%s: user '%s' not found, not adjusting ownership.", i.path, u);
missing_user_or_group = true;
} else if (r < 0) {
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to resolve user '%s': %m", u);
} else
i.uid_set = true;
}
if (!empty_or_dash(group)) {
const char *g;
g = startswith(group, ":");
if (g)
i.gid_only_create = true;
else
g = group;
r = find_gid(g, &i.gid, &c->gid_cache);
if (r == -ESRCH && arg_graceful) {
log_syntax(NULL, LOG_DEBUG, fname, line, r,
"%s: group '%s' not found, not adjusting ownership.", i.path, g);
missing_user_or_group = true;
} else if (r < 0) {
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to resolve group '%s': %m", g);
} else
i.gid_set = true;
}
if (!empty_or_dash(mode)) {
const char *mm;
unsigned m;
for (mm = mode;; mm++)
if (*mm == '~')
i.mask_perms = true;
else if (*mm == ':')
i.mode_only_create = true;
else
break;
r = parse_mode(mm, &m);
if (r < 0) {
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, r, "Invalid mode '%s'.", mode);
}
i.mode = m;
i.mode_set = true;
} else
i.mode = IN_SET(i.type,
CREATE_DIRECTORY,
TRUNCATE_DIRECTORY,
CREATE_SUBVOLUME,
CREATE_SUBVOLUME_INHERIT_QUOTA,
CREATE_SUBVOLUME_NEW_QUOTA) ? 0755 : 0644;
if (missing_user_or_group && (i.mode & ~0777) != 0) {
/* Refuse any special bits for nodes where we couldn't resolve the ownership properly. */
mode_t adjusted = i.mode & 0777;
log_syntax(NULL, LOG_INFO, fname, line, 0,
"Changing mode 0%o to 0%o because of changed ownership.", i.mode, adjusted);
i.mode = adjusted;
}
if (!empty_or_dash(age)) {
const char *a = age;
_cleanup_free_ char *seconds = NULL, *age_by = NULL;
if (*a == '~') {
i.keep_first_level = true;
a++;
}
/* Format: "age-by:age"; where age-by is "[abcmABCM]+". */
r = split_pair(a, ":", &age_by, &seconds);
if (r == -ENOMEM)
return log_oom();
if (r < 0 && r != -EINVAL)
return log_error_errno(r, "Failed to parse age-by for '%s': %m", age);
if (r >= 0) {
/* We found a ":", parse the "age-by" part. */
r = parse_age_by_from_arg(age_by, &i);
if (r == -ENOMEM)
return log_oom();
if (r < 0) {
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, r, "Invalid age-by '%s'.", age_by);
}
/* For parsing the "age" part, after the ":". */
a = seconds;
}
r = parse_sec(a, &i.age);
if (r < 0) {
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, r, "Invalid age '%s'.", a);
}
i.age_set = true;
}
h = needs_glob(i.type) ? c->globs : c->items;
existing = ordered_hashmap_get(h, i.path);
if (existing) {
if (is_duplicated_item(existing, &i)) {
log_syntax(NULL, LOG_NOTICE, fname, line, 0,
"Duplicate line for path \"%s\", ignoring.", i.path);
return 0;
}
} else {
existing = new0(ItemArray, 1);
if (!existing)
return log_oom();
r = ordered_hashmap_put(h, i.path, existing);
if (r < 0) {
free(existing);
return log_oom();
}
}
if (!GREEDY_REALLOC(existing->items, existing->n_items + 1))
return log_oom();
existing->items[existing->n_items++] = TAKE_STRUCT(i);
/* Sort item array, to enforce stable ordering of application */
typesafe_qsort(existing->items, existing->n_items, item_compare);
return 0;
}
static int cat_config(char **config_dirs, char **args) {
_cleanup_strv_free_ char **files = NULL;
int r;
r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, NULL);
if (r < 0)
return r;
pager_open(arg_pager_flags);
return cat_files(NULL, files, arg_cat_flags);
}
static int exclude_default_prefixes(void) {
int r;
/* Provide an easy way to exclude virtual/memory file systems from what we do here. Useful in
* combination with --root= where we probably don't want to apply stuff to these dirs as they are
* likely over-mounted if the root directory is actually used, and it wouldbe less than ideal to have
* all kinds of files created/adjusted underneath these mount points. */
r = strv_extend_many(
&arg_exclude_prefixes,
"/dev",
"/proc",
"/run",
"/sys");
if (r < 0)
return log_oom();
strv_uniq(arg_exclude_prefixes);
return 0;
}
static int help(void) {
_cleanup_free_ char *link = NULL;
int r;
r = terminal_urlify_man("systemd-tmpfiles", "8", &link);
if (r < 0)
return log_oom();
printf("%1$s COMMAND [OPTIONS...] [CONFIGURATION FILE...]\n"
"\n%2$sCreate, delete, and clean up files and directories.%4$s\n"
"\n%3$sCommands:%4$s\n"
" --create Create and adjust files and directories\n"
" --clean Clean up files and directories\n"
" --remove Remove files and directories marked for removal\n"
" --purge Delete files and directories marked for creation in\n"
" specified configuration files (careful!)\n"
" --cat-config Show configuration files\n"
" --tldr Show non-comment parts of configuration files\n"
" -h --help Show this help\n"
" --version Show package version\n"
"\n%3$sOptions:%4$s\n"
" --user Execute user configuration\n"
" --boot Execute actions only safe at boot\n"
" --graceful Quietly ignore unknown users or groups\n"
" --prefix=PATH Only apply rules with the specified prefix\n"
" --exclude-prefix=PATH Ignore rules with the specified prefix\n"
" -E Ignore rules prefixed with /dev, /proc, /run, /sys\n"
" --root=PATH Operate on an alternate filesystem root\n"
" --image=PATH Operate on disk image as filesystem root\n"
" --image-policy=POLICY Specify disk image dissection policy\n"
" --replace=PATH Treat arguments as replacement for PATH\n"
" --dry-run Just print what would be done\n"
" --no-pager Do not pipe output into a pager\n"
"\nSee the %5$s for details.\n",
program_invocation_short_name,
ansi_highlight(),
ansi_underline(),
ansi_normal(),
link);
return 0;
}
static int parse_argv(int argc, char *argv[]) {
enum {
ARG_VERSION = 0x100,
ARG_CAT_CONFIG,
ARG_TLDR,
ARG_USER,
ARG_CREATE,
ARG_CLEAN,
ARG_REMOVE,
ARG_PURGE,
ARG_BOOT,
ARG_GRACEFUL,
ARG_PREFIX,
ARG_EXCLUDE_PREFIX,
ARG_ROOT,
ARG_IMAGE,
ARG_IMAGE_POLICY,
ARG_REPLACE,
ARG_DRY_RUN,
ARG_NO_PAGER,
};
static const struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "user", no_argument, NULL, ARG_USER },
{ "version", no_argument, NULL, ARG_VERSION },
{ "cat-config", no_argument, NULL, ARG_CAT_CONFIG },
{ "tldr", no_argument, NULL, ARG_TLDR },
{ "create", no_argument, NULL, ARG_CREATE },
{ "clean", no_argument, NULL, ARG_CLEAN },
{ "remove", no_argument, NULL, ARG_REMOVE },
{ "purge", no_argument, NULL, ARG_PURGE },
{ "boot", no_argument, NULL, ARG_BOOT },
{ "graceful", no_argument, NULL, ARG_GRACEFUL },
{ "prefix", required_argument, NULL, ARG_PREFIX },
{ "exclude-prefix", required_argument, NULL, ARG_EXCLUDE_PREFIX },
{ "root", required_argument, NULL, ARG_ROOT },
{ "image", required_argument, NULL, ARG_IMAGE },
{ "image-policy", required_argument, NULL, ARG_IMAGE_POLICY },
{ "replace", required_argument, NULL, ARG_REPLACE },
{ "dry-run", no_argument, NULL, ARG_DRY_RUN },
{ "no-pager", no_argument, NULL, ARG_NO_PAGER },
{}
};
int c, r;
assert(argc >= 0);
assert(argv);
while ((c = getopt_long(argc, argv, "hE", options, NULL)) >= 0)
switch (c) {
case 'h':
return help();
case ARG_VERSION:
return version();
case ARG_CAT_CONFIG:
arg_cat_flags = CAT_CONFIG_ON;
break;
case ARG_TLDR:
arg_cat_flags = CAT_TLDR;
break;
case ARG_USER:
arg_runtime_scope = RUNTIME_SCOPE_USER;
break;
case ARG_CREATE:
arg_operation |= OPERATION_CREATE;
break;
case ARG_CLEAN:
arg_operation |= OPERATION_CLEAN;
break;
case ARG_REMOVE:
arg_operation |= OPERATION_REMOVE;
break;
case ARG_BOOT:
arg_boot = true;
break;
case ARG_PURGE:
arg_operation |= OPERATION_PURGE;
break;
case ARG_GRACEFUL:
arg_graceful = true;
break;
case ARG_PREFIX:
if (strv_extend(&arg_include_prefixes, optarg) < 0)
return log_oom();
break;
case ARG_EXCLUDE_PREFIX:
if (strv_extend(&arg_exclude_prefixes, optarg) < 0)
return log_oom();
break;
case ARG_ROOT:
r = parse_path_argument(optarg, /* suppress_root= */ false, &arg_root);
if (r < 0)
return r;
break;
case ARG_IMAGE:
#ifdef STANDALONE
return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
"This systemd-tmpfiles version is compiled without support for --image=.");
#else
r = parse_path_argument(optarg, /* suppress_root= */ false, &arg_image);
if (r < 0)
return r;
#endif
/* Imply -E here since it makes little sense to create files persistently in the /run mountpoint of a disk image */
_fallthrough_;
case 'E':
r = exclude_default_prefixes();
if (r < 0)
return r;
break;
case ARG_IMAGE_POLICY:
r = parse_image_policy_argument(optarg, &arg_image_policy);
if (r < 0)
return r;
break;
case ARG_REPLACE:
if (!path_is_absolute(optarg))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"The argument to --replace= must be an absolute path.");
if (!endswith(optarg, ".conf"))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"The argument to --replace= must have the extension '.conf'.");
arg_replace = optarg;
break;
case ARG_DRY_RUN:
arg_dry_run = true;
break;
case ARG_NO_PAGER:
arg_pager_flags |= PAGER_DISABLE;
break;
case '?':
return -EINVAL;
default:
assert_not_reached();
}
if (arg_operation == 0 && arg_cat_flags == CAT_CONFIG_OFF)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"You need to specify at least one of --clean, --create, --remove, or --purge.");
if (FLAGS_SET(arg_operation, OPERATION_PURGE) && optind >= argc)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Refusing --purge without specification of a configuration file.");
if (arg_replace && arg_cat_flags != CAT_CONFIG_OFF)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Option --replace= is not supported with --cat-config/--tldr.");
if (arg_replace && optind >= argc)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"When --replace= is given, some configuration items must be specified.");
if (arg_root && arg_runtime_scope == RUNTIME_SCOPE_USER)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Combination of --user and --root= is not supported.");
if (arg_image && arg_root)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Please specify either --root= or --image=, the combination of both is not supported.");
return 1;
}
static int read_config_file(
Context *c,
char **config_dirs,
const char *fn,
bool ignore_enoent,
bool *invalid_config) {
ItemArray *ia;
int r = 0;
assert(c);
assert(fn);
r = conf_file_read(arg_root, (const char**) config_dirs, fn,
parse_line, c, ignore_enoent, invalid_config);
if (r <= 0)
return r;
/* we have to determine age parameter for each entry of type X */
ORDERED_HASHMAP_FOREACH(ia, c->globs)
FOREACH_ARRAY(i, ia->items, ia->n_items) {
ItemArray *ja;
Item *candidate_item = NULL;
if (i->type != IGNORE_DIRECTORY_PATH)
continue;
ORDERED_HASHMAP_FOREACH(ja, c->items)
FOREACH_ARRAY(j, ja->items, ja->n_items) {
if (!IN_SET(j->type, CREATE_DIRECTORY,
TRUNCATE_DIRECTORY,
CREATE_SUBVOLUME,
CREATE_SUBVOLUME_INHERIT_QUOTA,
CREATE_SUBVOLUME_NEW_QUOTA))
continue;
if (path_equal(j->path, i->path)) {
candidate_item = j;
break;
}
if (candidate_item
? (path_startswith(j->path, candidate_item->path) && fnmatch(i->path, j->path, FNM_PATHNAME | FNM_PERIOD) == 0)
: path_startswith(i->path, j->path) != NULL)
candidate_item = j;
}
if (candidate_item && candidate_item->age_set) {
i->age = candidate_item->age;
i->age_set = true;
}
}
return r;
}
static int parse_arguments(
Context *c,
char **config_dirs,
char **args,
bool *invalid_config) {
int r;
assert(c);
STRV_FOREACH(arg, args) {
r = read_config_file(c, config_dirs, *arg, false, invalid_config);
if (r < 0)
return r;
}
return 0;
}
static int read_config_files(
Context *c,
char **config_dirs,
char **args,
bool *invalid_config) {
_cleanup_strv_free_ char **files = NULL;
_cleanup_free_ char *p = NULL;
int r;
assert(c);
r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, &p);
if (r < 0)
return r;
STRV_FOREACH(f, files)
if (p && path_equal(*f, p)) {
log_debug("Parsing arguments at position \"%s\"%s", *f, special_glyph(SPECIAL_GLYPH_ELLIPSIS));
r = parse_arguments(c, config_dirs, args, invalid_config);
if (r < 0)
return r;
} else
/* Just warn, ignore result otherwise.
* read_config_file() has some debug output, so no need to print anything. */
(void) read_config_file(c, config_dirs, *f, true, invalid_config);
return 0;
}
static int read_credential_lines(Context *c, bool *invalid_config) {
_cleanup_free_ char *j = NULL;
const char *d;
int r;
assert(c);
r = get_credentials_dir(&d);
if (r == -ENXIO)
return 0;
if (r < 0)
return log_error_errno(r, "Failed to get credentials directory: %m");
j = path_join(d, "tmpfiles.extra");
if (!j)
return log_oom();
(void) read_config_file(c, /* config_dirs= */ NULL, j, /* ignore_enoent= */ true, invalid_config);
return 0;
}
static int link_parent(Context *c, ItemArray *a) {
const char *path;
char *prefix;
int r;
assert(c);
assert(a);
/* Finds the closest "parent" item array for the specified item array. Then registers the specified
* item array as child of it, and fills the parent in, linking them both ways. This allows us to
* later create parents before their children, and clean up/remove children before their parents.
*/
if (a->n_items <= 0)
return 0;
path = a->items[0].path;
prefix = newa(char, strlen(path) + 1);
PATH_FOREACH_PREFIX(prefix, path) {
ItemArray *j;
j = ordered_hashmap_get(c->items, prefix);
if (!j)
j = ordered_hashmap_get(c->globs, prefix);
if (j) {
r = set_ensure_put(&j->children, NULL, a);
if (r < 0)
return log_oom();
a->parent = j;
return 1;
}
}
return 0;
}
DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(item_array_hash_ops, char, string_hash_func, string_compare_func,
ItemArray, item_array_free);
static int run(int argc, char *argv[]) {
#ifndef STANDALONE
_cleanup_(loop_device_unrefp) LoopDevice *loop_device = NULL;
_cleanup_(umount_and_freep) char *mounted_dir = NULL;
#endif
_cleanup_strv_free_ char **config_dirs = NULL;
_cleanup_(context_done) Context c = {};
bool invalid_config = false;
ItemArray *a;
enum {
PHASE_PURGE,
PHASE_REMOVE_AND_CLEAN,
PHASE_CREATE,
_PHASE_MAX
} phase;
int r;
r = parse_argv(argc, argv);
if (r <= 0)
return r;
log_setup();
/* We require /proc/ for a lot of our operations, i.e. for adjusting access modes, for anything
* SELinux related, for recursive operation, for xattr, acl and chattr handling, for btrfs stuff and
* a lot more. It's probably the majority of invocations where /proc/ is required. Since people
* apparently invoke it without anyway and are surprised about the failures, let's catch this early
* and output a nice and friendly warning. */
if (proc_mounted() == 0)
return log_error_errno(SYNTHETIC_ERRNO(ENOSYS),
"/proc/ is not mounted, but required for successful operation of systemd-tmpfiles. "
"Please mount /proc/. Alternatively, consider using the --root= or --image= switches.");
/* Descending down file system trees might take a lot of fds */
(void) rlimit_nofile_bump(HIGH_RLIMIT_NOFILE);
switch (arg_runtime_scope) {
case RUNTIME_SCOPE_USER:
r = user_config_paths(&config_dirs);
if (r < 0)
return log_error_errno(r, "Failed to initialize configuration directory list: %m");
break;
case RUNTIME_SCOPE_SYSTEM:
config_dirs = strv_new(CONF_PATHS("tmpfiles.d"));
if (!config_dirs)
return log_oom();
break;
default:
assert_not_reached();
}
if (DEBUG_LOGGING) {
_cleanup_free_ char *t = NULL;
STRV_FOREACH(i, config_dirs) {
_cleanup_free_ char *j = NULL;
j = path_join(arg_root, *i);
if (!j)
return log_oom();
if (!strextend(&t, "\n\t", j))
return log_oom();
}
log_debug("Looking for configuration files in (higher priority first):%s", t);
}
if (arg_cat_flags != CAT_CONFIG_OFF)
return cat_config(config_dirs, argv + optind);
umask(0022);
r = mac_init();
if (r < 0)
return r;
#ifndef STANDALONE
if (arg_image) {
assert(!arg_root);
r = mount_image_privately_interactively(
arg_image,
arg_image_policy,
DISSECT_IMAGE_GENERIC_ROOT |
DISSECT_IMAGE_REQUIRE_ROOT |
DISSECT_IMAGE_VALIDATE_OS |
DISSECT_IMAGE_RELAX_VAR_CHECK |
DISSECT_IMAGE_FSCK |
DISSECT_IMAGE_GROWFS |
DISSECT_IMAGE_ALLOW_USERSPACE_VERITY,
&mounted_dir,
/* ret_dir_fd= */ NULL,
&loop_device);
if (r < 0)
return r;
arg_root = strdup(mounted_dir);
if (!arg_root)
return log_oom();
}
#else
assert(!arg_image);
#endif
c.items = ordered_hashmap_new(&item_array_hash_ops);
c.globs = ordered_hashmap_new(&item_array_hash_ops);
if (!c.items || !c.globs)
return log_oom();
/* If command line arguments are specified along with --replace=, read all configuration files and
* insert the positional arguments at the specified place. Otherwise, if command line arguments are
* specified, execute just them, and finally, without --replace= or any positional arguments, just
* read configuration and execute it. */
if (arg_replace || optind >= argc)
r = read_config_files(&c, config_dirs, argv + optind, &invalid_config);
else
r = parse_arguments(&c, config_dirs, argv + optind, &invalid_config);
if (r < 0)
return r;
r = read_credential_lines(&c, &invalid_config);
if (r < 0)
return r;
/* Let's now link up all child/parent relationships */
ORDERED_HASHMAP_FOREACH(a, c.items) {
r = link_parent(&c, a);
if (r < 0)
return r;
}
ORDERED_HASHMAP_FOREACH(a, c.globs) {
r = link_parent(&c, a);
if (r < 0)
return r;
}
/* If multiple operations are requested, let's first run the remove/clean operations, and only then
* the create operations. i.e. that we first clean out the platform we then build on. */
for (phase = 0; phase < _PHASE_MAX; phase++) {
OperationMask op;
if (phase == PHASE_PURGE)
op = arg_operation & OPERATION_PURGE;
else if (phase == PHASE_REMOVE_AND_CLEAN)
op = arg_operation & (OPERATION_REMOVE|OPERATION_CLEAN);
else if (phase == PHASE_CREATE)
op = arg_operation & OPERATION_CREATE;
else
assert_not_reached();
if (op == 0) /* Nothing requested in this phase */
continue;
/* The non-globbing ones usually create things, hence we apply them first */
ORDERED_HASHMAP_FOREACH(a, c.items)
RET_GATHER(r, process_item_array(&c, a, op));
/* The globbing ones usually alter things, hence we apply them second. */
ORDERED_HASHMAP_FOREACH(a, c.globs)
RET_GATHER(r, process_item_array(&c, a, op));
}
if (ERRNO_IS_NEG_RESOURCE(r))
return r;
if (invalid_config)
return EX_DATAERR;
if (r < 0)
return EX_CANTCREAT;
return 0;
}
DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(run);
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