src/import/export.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2
   3 #include <getopt.h>
   4 #include <locale.h>
   5
   6 #include "sd-event.h"
   7 #include "sd-id128.h"
   8
   9 #include "alloc-util.h"
  10 #include "export-raw.h"
  11 #include "export-tar.h"
  12 #include "fd-util.h"
  13 #include "fs-util.h"
  14 #include "hostname-util.h"
  15 #include "import-util.h"
  16 #include "machine-image.h"
  17 #include "main-func.h"
  18 #include "signal-util.h"
  19 #include "string-util.h"
  20 #include "verbs.h"
  21
  22 static ImportCompressType arg_compress = IMPORT_COMPRESS_UNKNOWN;
  23
  24 static void determine_compression_from_filename(const char *p) {
  25
  26         if (arg_compress != IMPORT_COMPRESS_UNKNOWN)
  27                 return;
  28
  29         if (!p) {
  30                 arg_compress = IMPORT_COMPRESS_UNCOMPRESSED;
  31                 return;
  32         }
  33
  34         if (endswith(p, ".xz"))
  35                 arg_compress = IMPORT_COMPRESS_XZ;
  36         else if (endswith(p, ".gz"))
  37                 arg_compress = IMPORT_COMPRESS_GZIP;
  38         else if (endswith(p, ".bz2"))
  39                 arg_compress = IMPORT_COMPRESS_BZIP2;
  40         else
  41                 arg_compress = IMPORT_COMPRESS_UNCOMPRESSED;
  42 }
  43
  44 static int interrupt_signal_handler(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
  45         log_notice("Transfer aborted.");
  46         sd_event_exit(sd_event_source_get_event(s), EINTR);
  47         return 0;
  48 }
  49
  50 static void on_tar_finished(TarExport *export, int error, void *userdata) {
  51         sd_event *event = userdata;
  52         assert(export);
  53
  54         if (error == 0)
  55                 log_info("Operation completed successfully.");
  56
  57         sd_event_exit(event, abs(error));
  58 }
  59
  60 static int export_tar(int argc, char *argv[], void *userdata) {
  61         _cleanup_(tar_export_unrefp) TarExport *export = NULL;
  62         _cleanup_(sd_event_unrefp) sd_event *event = NULL;
  63         _cleanup_(image_unrefp) Image *image = NULL;
  64         const char *path = NULL, *local = NULL;
  65         _cleanup_close_ int open_fd = -1;
  66         int r, fd;
  67
  68         if (machine_name_is_valid(argv[1])) {
  69                 r = image_find(IMAGE_MACHINE, argv[1], &image);
  70                 if (r == -ENOENT)
  71                         return log_error_errno(r, "Machine image %s not found.", argv[1]);
  72                 if (r < 0)
  73                         return log_error_errno(r, "Failed to look for machine %s: %m", argv[1]);
  74
  75                 local = image->path;
  76         } else
  77                 local = argv[1];
  78
  79         if (argc >= 3)
  80                 path = argv[2];
  81         path = empty_or_dash_to_null(path);
  82
  83         determine_compression_from_filename(path);
  84
  85         if (path) {
  86                 open_fd = open(path, O_WRONLY|O_CREAT|O_TRUNC|O_CLOEXEC|O_NOCTTY, 0666);
  87                 if (open_fd < 0)
  88                         return log_error_errno(errno, "Failed to open tar image for export: %m");
  89
  90                 fd = open_fd;
  91
  92                 log_info("Exporting '%s', saving to '%s' with compression '%s'.", local, path, import_compress_type_to_string(arg_compress));
  93         } else {
  94                 _cleanup_free_ char *pretty = NULL;
  95
  96                 fd = STDOUT_FILENO;
  97
  98                 (void) fd_get_path(fd, &pretty);
  99                 log_info("Exporting '%s', saving to '%s' with compression '%s'.", local, strna(pretty), import_compress_type_to_string(arg_compress));
 100         }
 101
 102         r = sd_event_default(&event);
 103         if (r < 0)
 104                 return log_error_errno(r, "Failed to allocate event loop: %m");
 105
 106         assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, -1) >= 0);
 107         (void) sd_event_add_signal(event, NULL, SIGTERM, interrupt_signal_handler,  NULL);
 108         (void) sd_event_add_signal(event, NULL, SIGINT, interrupt_signal_handler, NULL);
 109
 110         r = tar_export_new(&export, event, on_tar_finished, event);
 111         if (r < 0)
 112                 return log_error_errno(r, "Failed to allocate exporter: %m");
 113
 114         r = tar_export_start(export, local, fd, arg_compress);
 115         if (r < 0)
 116                 return log_error_errno(r, "Failed to export image: %m");
 117
 118         r = sd_event_loop(event);
 119         if (r < 0)
 120                 return log_error_errno(r, "Failed to run event loop: %m");
 121
 122         log_info("Exiting.");
 123         return -r;
 124 }
 125
 126 static void on_raw_finished(RawExport *export, int error, void *userdata) {
 127         sd_event *event = userdata;
 128         assert(export);
 129
 130         if (error == 0)
 131                 log_info("Operation completed successfully.");
 132
 133         sd_event_exit(event, abs(error));
 134 }
 135
 136 static int export_raw(int argc, char *argv[], void *userdata) {
 137         _cleanup_(raw_export_unrefp) RawExport *export = NULL;
 138         _cleanup_(sd_event_unrefp) sd_event *event = NULL;
 139         _cleanup_(image_unrefp) Image *image = NULL;
 140         const char *path = NULL, *local = NULL;
 141         _cleanup_close_ int open_fd = -1;
 142         int r, fd;
 143
 144         if (machine_name_is_valid(argv[1])) {
 145                 r = image_find(IMAGE_MACHINE, argv[1], &image);
 146                 if (r == -ENOENT)
 147                         return log_error_errno(r, "Machine image %s not found.", argv[1]);
 148                 if (r < 0)
 149                         return log_error_errno(r, "Failed to look for machine %s: %m", argv[1]);
 150
 151                 local = image->path;
 152         } else
 153                 local = argv[1];
 154
 155         if (argc >= 3)
 156                 path = argv[2];
 157         path = empty_or_dash_to_null(path);
 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) fd_get_path(fd, &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                                 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
 257                                                        "Unknown format: %s", optarg);
 258                         break;
 259
 260                 case '?':
 261                         return -EINVAL;
 262
 263                 default:
 264                         assert_not_reached("Unhandled option");
 265                 }
 266
 267         return 1;
 268 }
 269
 270 static int export_main(int argc, char *argv[]) {
 271         static const Verb verbs[] = {
 272                 { "help", VERB_ANY, VERB_ANY, 0, help       },
 273                 { "tar",  2,        3,        0, export_tar },
 274                 { "raw",  2,        3,        0, export_raw },
 275                 {}
 276         };
 277
 278         return dispatch_verb(argc, argv, verbs, NULL);
 279 }
 280
 281 static int run(int argc, char *argv[]) {
 282         int r;
 283
 284         setlocale(LC_ALL, "");
 285         log_parse_environment();
 286         log_open();
 287
 288         r = parse_argv(argc, argv);
 289         if (r <= 0)
 290                 return r;
 291
 292         (void) ignore_signals(SIGPIPE, -1);
 293
 294         return export_main(argc, argv);
 295 }
 296
 297 DEFINE_MAIN_FUNCTION(run);