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0fef5b0f0b
This reverts commit 1f22621ba3.
As described in the reverted commit, we don't want to get rid of the check
completely. But the check requires opting-in by setting SYSTEMD_IN_INITRD=lenient,
which is cumbersome and doesn't seem to actually happen.
https://bugzilla.redhat.com/show_bug.cgi?id=2137631 is caused by systemd refusing
to treat the system as an initrd because overlayfs is used. Let's revert this
approach and do something that doesn't require opt-in instead.
I don't think it makes sense to keep support for "SYSTEMD_IN_INITRD=lenient" or
"SYSTEMD_IN_INITRD=auto". To get "auto" behaviour, just unset the option. And
"lenient" will be reimplemented as a better check. Thus the changes to the
option interface are completely reverted.
135 lines
3.3 KiB
C
135 lines
3.3 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include "alloc-util.h"
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#include "build.h"
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#include "env-file.h"
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#include "env-util.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "hostname-util.h"
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#include "log.h"
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#include "macro.h"
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#include "parse-util.h"
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#include "stat-util.h"
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#include "string-util.h"
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#include "util.h"
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#include "virt.h"
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int saved_argc = 0;
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char **saved_argv = NULL;
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static int saved_in_initrd = -1;
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int prot_from_flags(int flags) {
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switch (flags & O_ACCMODE) {
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case O_RDONLY:
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return PROT_READ;
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case O_WRONLY:
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return PROT_WRITE;
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case O_RDWR:
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return PROT_READ|PROT_WRITE;
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default:
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return -EINVAL;
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}
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}
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bool in_initrd(void) {
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int r;
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if (saved_in_initrd >= 0)
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return saved_in_initrd;
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/* We make two checks here:
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*
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* 1. the flag file /etc/initrd-release must exist
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* 2. the root file system must be a memory file system
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*
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* The second check is extra paranoia, since misdetecting an
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* initrd can have bad consequences due the initrd
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* emptying when transititioning to the main systemd.
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*/
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r = getenv_bool_secure("SYSTEMD_IN_INITRD");
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if (r < 0 && r != -ENXIO)
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log_debug_errno(r, "Failed to parse $SYSTEMD_IN_INITRD, ignoring: %m");
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if (r >= 0)
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saved_in_initrd = r > 0;
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else
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saved_in_initrd = access("/etc/initrd-release", F_OK) >= 0 &&
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path_is_temporary_fs("/") > 0;
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return saved_in_initrd;
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}
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void in_initrd_force(bool value) {
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saved_in_initrd = value;
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}
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int container_get_leader(const char *machine, pid_t *pid) {
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_cleanup_free_ char *s = NULL, *class = NULL;
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const char *p;
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pid_t leader;
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int r;
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assert(machine);
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assert(pid);
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if (streq(machine, ".host")) {
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*pid = 1;
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return 0;
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}
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if (!hostname_is_valid(machine, 0))
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return -EINVAL;
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p = strjoina("/run/systemd/machines/", machine);
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r = parse_env_file(NULL, p,
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"LEADER", &s,
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"CLASS", &class);
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if (r == -ENOENT)
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return -EHOSTDOWN;
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if (r < 0)
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return r;
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if (!s)
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return -EIO;
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if (!streq_ptr(class, "container"))
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return -EIO;
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r = parse_pid(s, &leader);
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if (r < 0)
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return r;
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if (leader <= 1)
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return -EIO;
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*pid = leader;
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return 0;
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}
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int version(void) {
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printf("systemd " STRINGIFY(PROJECT_VERSION) " (" GIT_VERSION ")\n%s\n",
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systemd_features);
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return 0;
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}
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/* Turn off core dumps but only if we're running outside of a container. */
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void disable_coredumps(void) {
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int r;
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if (detect_container() > 0)
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return;
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r = write_string_file("/proc/sys/kernel/core_pattern", "|/bin/false", WRITE_STRING_FILE_DISABLE_BUFFER);
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if (r < 0)
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log_debug_errno(r, "Failed to turn off coredumps, ignoring: %m");
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}
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