52ef5dd798
Let's clean up hostname_is_valid() a bit: let's turn the second boolean argument into a more explanatory flags field, and add a flag that accepts the special name ".host" as valid. This is useful for the container logic, where the special hostname ".host" refers to the "root container", i.e. the host system itself, and can be specified at various places. let's also get rid of machine_name_is_valid(). It was just an alias, which is confusing and even more so now that we have the flags param.
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 "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 "machine-image.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], &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], &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("Unhandled option");
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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, -1);
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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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