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04499a70fb
In general we almost never hit those asserts in production code, so users see them very rarely, if ever. But either way, we just need something that users can pass to the developers. We have quite a few of those asserts, and some have fairly nice messages, but many are like "WTF?" or "???" or "unexpected something". The error that is printed includes the file location, and function name. In almost all functions there's at most one assert, so the function name alone is enough to identify the failure for a developer. So we don't get much extra from the message, and we might just as well drop them. Dropping them makes our code a tiny bit smaller, and most importantly, improves development experience by making it easy to insert such an assert in the code without thinking how to phrase the argument.
298 lines
9.8 KiB
C
298 lines
9.8 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include <getopt.h>
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#include <locale.h>
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#include "sd-event.h"
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#include "sd-id128.h"
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#include "alloc-util.h"
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#include "discover-image.h"
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#include "export-raw.h"
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#include "export-tar.h"
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#include "fd-util.h"
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#include "fs-util.h"
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#include "hostname-util.h"
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#include "import-util.h"
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#include "main-func.h"
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#include "signal-util.h"
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#include "string-util.h"
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#include "verbs.h"
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static ImportCompressType arg_compress = IMPORT_COMPRESS_UNKNOWN;
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static void determine_compression_from_filename(const char *p) {
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if (arg_compress != IMPORT_COMPRESS_UNKNOWN)
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return;
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if (!p) {
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arg_compress = IMPORT_COMPRESS_UNCOMPRESSED;
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return;
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}
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if (endswith(p, ".xz"))
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arg_compress = IMPORT_COMPRESS_XZ;
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else if (endswith(p, ".gz"))
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arg_compress = IMPORT_COMPRESS_GZIP;
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else if (endswith(p, ".bz2"))
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arg_compress = IMPORT_COMPRESS_BZIP2;
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else
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arg_compress = IMPORT_COMPRESS_UNCOMPRESSED;
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}
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static int interrupt_signal_handler(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
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log_notice("Transfer aborted.");
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sd_event_exit(sd_event_source_get_event(s), EINTR);
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return 0;
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}
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static void on_tar_finished(TarExport *export, int error, void *userdata) {
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sd_event *event = userdata;
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assert(export);
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if (error == 0)
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log_info("Operation completed successfully.");
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sd_event_exit(event, abs(error));
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}
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static int export_tar(int argc, char *argv[], void *userdata) {
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_cleanup_(tar_export_unrefp) TarExport *export = NULL;
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_cleanup_(sd_event_unrefp) sd_event *event = NULL;
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_cleanup_(image_unrefp) Image *image = NULL;
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const char *path = NULL, *local = NULL;
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_cleanup_close_ int open_fd = -1;
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int r, fd;
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if (hostname_is_valid(argv[1], 0)) {
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r = image_find(IMAGE_MACHINE, argv[1], NULL, &image);
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if (r == -ENOENT)
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return log_error_errno(r, "Machine image %s not found.", argv[1]);
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if (r < 0)
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return log_error_errno(r, "Failed to look for machine %s: %m", argv[1]);
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local = image->path;
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} else
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local = argv[1];
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if (argc >= 3)
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path = argv[2];
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path = empty_or_dash_to_null(path);
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determine_compression_from_filename(path);
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if (path) {
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open_fd = open(path, O_WRONLY|O_CREAT|O_TRUNC|O_CLOEXEC|O_NOCTTY, 0666);
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if (open_fd < 0)
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return log_error_errno(errno, "Failed to open tar image for export: %m");
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fd = open_fd;
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log_info("Exporting '%s', saving to '%s' with compression '%s'.", local, path, import_compress_type_to_string(arg_compress));
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} else {
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_cleanup_free_ char *pretty = NULL;
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fd = STDOUT_FILENO;
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(void) fd_get_path(fd, &pretty);
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log_info("Exporting '%s', saving to '%s' with compression '%s'.", local, strna(pretty), import_compress_type_to_string(arg_compress));
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}
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r = sd_event_default(&event);
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if (r < 0)
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return log_error_errno(r, "Failed to allocate event loop: %m");
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assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, -1) >= 0);
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(void) sd_event_add_signal(event, NULL, SIGTERM, interrupt_signal_handler, NULL);
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(void) sd_event_add_signal(event, NULL, SIGINT, interrupt_signal_handler, NULL);
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r = tar_export_new(&export, event, on_tar_finished, event);
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if (r < 0)
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return log_error_errno(r, "Failed to allocate exporter: %m");
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r = tar_export_start(export, local, fd, arg_compress);
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if (r < 0)
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return log_error_errno(r, "Failed to export image: %m");
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r = sd_event_loop(event);
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if (r < 0)
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return log_error_errno(r, "Failed to run event loop: %m");
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log_info("Exiting.");
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return -r;
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}
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static void on_raw_finished(RawExport *export, int error, void *userdata) {
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sd_event *event = userdata;
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assert(export);
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if (error == 0)
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log_info("Operation completed successfully.");
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sd_event_exit(event, abs(error));
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}
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static int export_raw(int argc, char *argv[], void *userdata) {
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_cleanup_(raw_export_unrefp) RawExport *export = NULL;
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_cleanup_(sd_event_unrefp) sd_event *event = NULL;
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_cleanup_(image_unrefp) Image *image = NULL;
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const char *path = NULL, *local = NULL;
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_cleanup_close_ int open_fd = -1;
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int r, fd;
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if (hostname_is_valid(argv[1], 0)) {
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r = image_find(IMAGE_MACHINE, argv[1], NULL, &image);
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if (r == -ENOENT)
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return log_error_errno(r, "Machine image %s not found.", argv[1]);
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if (r < 0)
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return log_error_errno(r, "Failed to look for machine %s: %m", argv[1]);
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local = image->path;
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} else
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local = argv[1];
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if (argc >= 3)
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path = argv[2];
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path = empty_or_dash_to_null(path);
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determine_compression_from_filename(path);
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if (path) {
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open_fd = open(path, O_WRONLY|O_CREAT|O_TRUNC|O_CLOEXEC|O_NOCTTY, 0666);
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if (open_fd < 0)
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return log_error_errno(errno, "Failed to open raw image for export: %m");
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fd = open_fd;
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log_info("Exporting '%s', saving to '%s' with compression '%s'.", local, path, import_compress_type_to_string(arg_compress));
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} else {
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_cleanup_free_ char *pretty = NULL;
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fd = STDOUT_FILENO;
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(void) fd_get_path(fd, &pretty);
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log_info("Exporting '%s', saving to '%s' with compression '%s'.", local, strna(pretty), import_compress_type_to_string(arg_compress));
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}
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r = sd_event_default(&event);
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if (r < 0)
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return log_error_errno(r, "Failed to allocate event loop: %m");
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assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, -1) >= 0);
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(void) sd_event_add_signal(event, NULL, SIGTERM, interrupt_signal_handler, NULL);
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(void) sd_event_add_signal(event, NULL, SIGINT, interrupt_signal_handler, NULL);
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r = raw_export_new(&export, event, on_raw_finished, event);
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if (r < 0)
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return log_error_errno(r, "Failed to allocate exporter: %m");
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r = raw_export_start(export, local, fd, arg_compress);
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if (r < 0)
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return log_error_errno(r, "Failed to export image: %m");
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r = sd_event_loop(event);
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if (r < 0)
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return log_error_errno(r, "Failed to run event loop: %m");
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log_info("Exiting.");
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return -r;
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}
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static int help(int argc, char *argv[], void *userdata) {
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printf("%s [OPTIONS...] {COMMAND} ...\n\n"
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"Export container or virtual machine images.\n\n"
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" -h --help Show this help\n"
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" --version Show package version\n"
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" --format=FORMAT Select format\n\n"
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"Commands:\n"
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" tar NAME [FILE] Export a TAR image\n"
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" raw NAME [FILE] Export a RAW image\n",
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program_invocation_short_name);
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return 0;
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}
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static int parse_argv(int argc, char *argv[]) {
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enum {
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ARG_VERSION = 0x100,
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ARG_FORMAT,
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};
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static const struct option options[] = {
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{ "help", no_argument, NULL, 'h' },
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{ "version", no_argument, NULL, ARG_VERSION },
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{ "format", required_argument, NULL, ARG_FORMAT },
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{}
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};
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int c;
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assert(argc >= 0);
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assert(argv);
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while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
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switch (c) {
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case 'h':
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return help(0, NULL, NULL);
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case ARG_VERSION:
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return version();
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case ARG_FORMAT:
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if (streq(optarg, "uncompressed"))
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arg_compress = IMPORT_COMPRESS_UNCOMPRESSED;
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else if (streq(optarg, "xz"))
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arg_compress = IMPORT_COMPRESS_XZ;
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else if (streq(optarg, "gzip"))
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arg_compress = IMPORT_COMPRESS_GZIP;
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else if (streq(optarg, "bzip2"))
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arg_compress = IMPORT_COMPRESS_BZIP2;
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else
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
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"Unknown format: %s", optarg);
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break;
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case '?':
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return -EINVAL;
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default:
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assert_not_reached();
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}
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return 1;
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}
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static int export_main(int argc, char *argv[]) {
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static const Verb verbs[] = {
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{ "help", VERB_ANY, VERB_ANY, 0, help },
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{ "tar", 2, 3, 0, export_tar },
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{ "raw", 2, 3, 0, export_raw },
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{}
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};
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return dispatch_verb(argc, argv, verbs, NULL);
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}
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static int run(int argc, char *argv[]) {
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int r;
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setlocale(LC_ALL, "");
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log_parse_environment();
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log_open();
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r = parse_argv(argc, argv);
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if (r <= 0)
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return r;
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(void) ignore_signals(SIGPIPE);
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return export_main(argc, argv);
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}
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DEFINE_MAIN_FUNCTION(run);
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