src/import/export.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <getopt.h>
   4
   5 #include "sd-event.h"
   6 #include "sd-id128.h"
   7
   8 #include "alloc-util.h"
   9 #include "export-raw.h"
  10 #include "export-tar.h"
  11 #include "fd-util.h"
  12 #include "fs-util.h"
  13 #include "hostname-util.h"
  14 #include "import-util.h"
  15 #include "machine-image.h"
  16 #include "signal-util.h"
  17 #include "string-util.h"
  18 #include "verbs.h"
  19
  20 static ImportCompressType arg_compress = IMPORT_COMPRESS_UNKNOWN;
  21
  22 static void determine_compression_from_filename(const char *p) {
  23
  24         if (arg_compress != IMPORT_COMPRESS_UNKNOWN)
  25                 return;
  26
  27         if (!p) {
  28                 arg_compress = IMPORT_COMPRESS_UNCOMPRESSED;
  29                 return;
  30         }
  31
  32         if (endswith(p, ".xz"))
  33                 arg_compress = IMPORT_COMPRESS_XZ;
  34         else if (endswith(p, ".gz"))
  35                 arg_compress = IMPORT_COMPRESS_GZIP;
  36         else if (endswith(p, ".bz2"))
  37                 arg_compress = IMPORT_COMPRESS_BZIP2;
  38         else
  39                 arg_compress = IMPORT_COMPRESS_UNCOMPRESSED;
  40 }
  41
  42 static int interrupt_signal_handler(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
  43         log_notice("Transfer aborted.");
  44         sd_event_exit(sd_event_source_get_event(s), EINTR);
  45         return 0;
  46 }
  47
  48 static void on_tar_finished(TarExport *export, int error, void *userdata) {
  49         sd_event *event = userdata;
  50         assert(export);
  51
  52         if (error == 0)
  53                 log_info("Operation completed successfully.");
  54
  55         sd_event_exit(event, abs(error));
  56 }
  57
  58 static int export_tar(int argc, char *argv[], void *userdata) {
  59         _cleanup_(tar_export_unrefp) TarExport *export = NULL;
  60         _cleanup_(sd_event_unrefp) sd_event *event = NULL;
  61         _cleanup_(image_unrefp) Image *image = NULL;
  62         const char *path = NULL, *local = NULL;
  63         _cleanup_close_ int open_fd = -1;
  64         int r, fd;
  65
  66         if (machine_name_is_valid(argv[1])) {
  67                 r = image_find(IMAGE_MACHINE, argv[1], &image);
  68                 if (r == -ENOENT)
  69                         return log_error_errno(r, "Machine image %s not found.", argv[1]);
  70                 if (r < 0)
  71                         return log_error_errno(r, "Failed to look for machine %s: %m", argv[1]);
  72
  73                 local = image->path;
  74         } else
  75                 local = argv[1];
  76
  77         if (argc >= 3)
  78                 path = argv[2];
  79         if (isempty(path) || streq(path, "-"))
  80                 path = NULL;
  81
  82         determine_compression_from_filename(path);
  83
  84         if (path) {
  85                 open_fd = open(path, O_WRONLY|O_CREAT|O_TRUNC|O_CLOEXEC|O_NOCTTY, 0666);
  86                 if (open_fd < 0)
  87                         return log_error_errno(errno, "Failed to open tar image for export: %m");
  88
  89                 fd = open_fd;
  90
  91                 log_info("Exporting '%s', saving to '%s' with compression '%s'.", local, path, import_compress_type_to_string(arg_compress));
  92         } else {
  93                 _cleanup_free_ char *pretty = NULL;
  94
  95                 fd = STDOUT_FILENO;
  96
  97                 (void) readlink_malloc("/proc/self/fd/1", &pretty);
  98                 log_info("Exporting '%s', saving to '%s' with compression '%s'.", local, strna(pretty), import_compress_type_to_string(arg_compress));
  99         }
 100
 101         r = sd_event_default(&event);
 102         if (r < 0)
 103                 return log_error_errno(r, "Failed to allocate event loop: %m");
 104
 105         assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, -1) >= 0);
 106         (void) sd_event_add_signal(event, NULL, SIGTERM, interrupt_signal_handler,  NULL);
 107         (void) sd_event_add_signal(event, NULL, SIGINT, interrupt_signal_handler, NULL);
 108
 109         r = tar_export_new(&export, event, on_tar_finished, event);
 110         if (r < 0)
 111                 return log_error_errno(r, "Failed to allocate exporter: %m");
 112
 113         r = tar_export_start(export, local, fd, arg_compress);
 114         if (r < 0)
 115                 return log_error_errno(r, "Failed to export image: %m");
 116
 117         r = sd_event_loop(event);
 118         if (r < 0)
 119                 return log_error_errno(r, "Failed to run event loop: %m");
 120
 121         log_info("Exiting.");
 122         return -r;
 123 }
 124
 125 static void on_raw_finished(RawExport *export, int error, void *userdata) {
 126         sd_event *event = userdata;
 127         assert(export);
 128
 129         if (error == 0)
 130                 log_info("Operation completed successfully.");
 131
 132         sd_event_exit(event, abs(error));
 133 }
 134
 135 static int export_raw(int argc, char *argv[], void *userdata) {
 136         _cleanup_(raw_export_unrefp) RawExport *export = NULL;
 137         _cleanup_(sd_event_unrefp) sd_event *event = NULL;
 138         _cleanup_(image_unrefp) Image *image = NULL;
 139         const char *path = NULL, *local = NULL;
 140         _cleanup_close_ int open_fd = -1;
 141         int r, fd;
 142
 143         if (machine_name_is_valid(argv[1])) {
 144                 r = image_find(IMAGE_MACHINE, argv[1], &image);
 145                 if (r == -ENOENT)
 146                         return log_error_errno(r, "Machine image %s not found.", argv[1]);
 147                 if (r < 0)
 148                         return log_error_errno(r, "Failed to look for machine %s: %m", argv[1]);
 149
 150                 local = image->path;
 151         } else
 152                 local = argv[1];
 153
 154         if (argc >= 3)
 155                 path = argv[2];
 156         if (isempty(path) || streq(path, "-"))
 157                 path = NULL;
 158
 159         determine_compression_from_filename(path);
 160
 161         if (path) {
 162                 open_fd = open(path, O_WRONLY|O_CREAT|O_TRUNC|O_CLOEXEC|O_NOCTTY, 0666);
 163                 if (open_fd < 0)
 164                         return log_error_errno(errno, "Failed to open raw image for export: %m");
 165
 166                 fd = open_fd;
 167
 168                 log_info("Exporting '%s', saving to '%s' with compression '%s'.", local, path, import_compress_type_to_string(arg_compress));
 169         } else {
 170                 _cleanup_free_ char *pretty = NULL;
 171
 172                 fd = STDOUT_FILENO;
 173
 174                 (void) readlink_malloc("/proc/self/fd/1", &pretty);
 175                 log_info("Exporting '%s', saving to '%s' with compression '%s'.", local, strna(pretty), import_compress_type_to_string(arg_compress));
 176         }
 177
 178         r = sd_event_default(&event);
 179         if (r < 0)
 180                 return log_error_errno(r, "Failed to allocate event loop: %m");
 181
 182         assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, -1) >= 0);
 183         (void) sd_event_add_signal(event, NULL, SIGTERM, interrupt_signal_handler,  NULL);
 184         (void) sd_event_add_signal(event, NULL, SIGINT, interrupt_signal_handler, NULL);
 185
 186         r = raw_export_new(&export, event, on_raw_finished, event);
 187         if (r < 0)
 188                 return log_error_errno(r, "Failed to allocate exporter: %m");
 189
 190         r = raw_export_start(export, local, fd, arg_compress);
 191         if (r < 0)
 192                 return log_error_errno(r, "Failed to export image: %m");
 193
 194         r = sd_event_loop(event);
 195         if (r < 0)
 196                 return log_error_errno(r, "Failed to run event loop: %m");
 197
 198         log_info("Exiting.");
 199         return -r;
 200 }
 201
 202 static int help(int argc, char *argv[], void *userdata) {
 203
 204         printf("%s [OPTIONS...] {COMMAND} ...\n\n"
 205                "Export container or virtual machine images.\n\n"
 206                "  -h --help                    Show this help\n"
 207                "     --version                 Show package version\n"
 208                "     --format=FORMAT           Select format\n\n"
 209                "Commands:\n"
 210                "  tar NAME [FILE]              Export a TAR image\n"
 211                "  raw NAME [FILE]              Export a RAW image\n",
 212                program_invocation_short_name);
 213
 214         return 0;
 215 }
 216
 217 static int parse_argv(int argc, char *argv[]) {
 218
 219         enum {
 220                 ARG_VERSION = 0x100,
 221                 ARG_FORMAT,
 222         };
 223
 224         static const struct option options[] = {
 225                 { "help",    no_argument,       NULL, 'h'         },
 226                 { "version", no_argument,       NULL, ARG_VERSION },
 227                 { "format",  required_argument, NULL, ARG_FORMAT  },
 228                 {}
 229         };
 230
 231         int c;
 232
 233         assert(argc >= 0);
 234         assert(argv);
 235
 236         while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
 237
 238                 switch (c) {
 239
 240                 case 'h':
 241                         return help(0, NULL, NULL);
 242
 243                 case ARG_VERSION:
 244                         return version();
 245
 246                 case ARG_FORMAT:
 247                         if (streq(optarg, "uncompressed"))
 248                                 arg_compress = IMPORT_COMPRESS_UNCOMPRESSED;
 249                         else if (streq(optarg, "xz"))
 250                                 arg_compress = IMPORT_COMPRESS_XZ;
 251                         else if (streq(optarg, "gzip"))
 252                                 arg_compress = IMPORT_COMPRESS_GZIP;
 253                         else if (streq(optarg, "bzip2"))
 254                                 arg_compress = IMPORT_COMPRESS_BZIP2;
 255                         else {
 256                                 log_error("Unknown format: %s", optarg);
 257                                 return -EINVAL;
 258                         }
 259                         break;
 260
 261                 case '?':
 262                         return -EINVAL;
 263
 264                 default:
 265                         assert_not_reached("Unhandled option");
 266                 }
 267
 268         return 1;
 269 }
 270
 271 static int export_main(int argc, char *argv[]) {
 272
 273         static const Verb verbs[] = {
 274                 { "help", VERB_ANY, VERB_ANY, 0, help       },
 275                 { "tar",  2,        3,        0, export_tar },
 276                 { "raw",  2,        3,        0, export_raw },
 277                 {}
 278         };
 279
 280         return dispatch_verb(argc, argv, verbs, NULL);
 281 }
 282
 283 int main(int argc, char *argv[]) {
 284         int r;
 285
 286         setlocale(LC_ALL, "");
 287         log_parse_environment();
 288         log_open();
 289
 290         r = parse_argv(argc, argv);
 291         if (r <= 0)
 292                 goto finish;
 293
 294         (void) ignore_signals(SIGPIPE, -1);
 295
 296         r = export_main(argc, argv);
 297
 298 finish:
 299         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 300 }