Zbigniew Jędrzejewski-Szmek
254d1313ae
-1 was used everywhere, but -EBADF or -EBADFD started being used in various places. Let's make things consistent in the new style. Note that there are two candidates: EBADF 9 Bad file descriptor EBADFD 77 File descriptor in bad state Since we're initializating the fd, we're just assigning a value that means "no fd yet", so it's just a bad file descriptor, and the first errno fits better. If instead we had a valid file descriptor that became invalid because of some operation or state change, the other errno would fit better. In some places, initialization is dropped if unnecessary.
299 lines
9.8 KiB
C
299 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 "build.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 = -EBADF;
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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 = -EBADF;
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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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