src/import/import.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   Copyright 2015 Lennart Poettering
   4 ***/
   5
   6 #include <getopt.h>
   7
   8 #include "sd-event.h"
   9 #include "sd-id128.h"
  10
  11 #include "alloc-util.h"
  12 #include "fd-util.h"
  13 #include "fs-util.h"
  14 #include "hostname-util.h"
  15 #include "import-raw.h"
  16 #include "import-tar.h"
  17 #include "import-util.h"
  18 #include "machine-image.h"
  19 #include "signal-util.h"
  20 #include "string-util.h"
  21 #include "verbs.h"
  22
  23 static bool arg_force = false;
  24 static bool arg_read_only = false;
  25 static const char *arg_image_root = "/var/lib/machines";
  26
  27 static int interrupt_signal_handler(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
  28         log_notice("Transfer aborted.");
  29         sd_event_exit(sd_event_source_get_event(s), EINTR);
  30         return 0;
  31 }
  32
  33 static void on_tar_finished(TarImport *import, int error, void *userdata) {
  34         sd_event *event = userdata;
  35         assert(import);
  36
  37         if (error == 0)
  38                 log_info("Operation completed successfully.");
  39
  40         sd_event_exit(event, abs(error));
  41 }
  42
  43 static int import_tar(int argc, char *argv[], void *userdata) {
  44         _cleanup_(tar_import_unrefp) TarImport *import = NULL;
  45         _cleanup_(sd_event_unrefp) sd_event *event = NULL;
  46         const char *path = NULL, *local = NULL;
  47         _cleanup_free_ char *ll = NULL;
  48         _cleanup_close_ int open_fd = -1;
  49         int r, fd;
  50
  51         if (argc >= 2)
  52                 path = argv[1];
  53         if (isempty(path) || streq(path, "-"))
  54                 path = NULL;
  55
  56         if (argc >= 3)
  57                 local = argv[2];
  58         else if (path)
  59                 local = basename(path);
  60         if (isempty(local) || streq(local, "-"))
  61                 local = NULL;
  62
  63         if (local) {
  64                 r = tar_strip_suffixes(local, &ll);
  65                 if (r < 0)
  66                         return log_oom();
  67
  68                 local = ll;
  69
  70                 if (!machine_name_is_valid(local)) {
  71                         log_error("Local image name '%s' is not valid.", local);
  72                         return -EINVAL;
  73                 }
  74
  75                 if (!arg_force) {
  76                         r = image_find(IMAGE_MACHINE, local, NULL);
  77                         if (r < 0) {
  78                                 if (r != -ENOENT)
  79                                         return log_error_errno(r, "Failed to check whether image '%s' exists: %m", local);
  80                         } else {
  81                                 log_error("Image '%s' already exists.", local);
  82                                 return -EEXIST;
  83                         }
  84                 }
  85         } else
  86                 local = "imported";
  87
  88         if (path) {
  89                 open_fd = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY);
  90                 if (open_fd < 0)
  91                         return log_error_errno(errno, "Failed to open tar image to import: %m");
  92
  93                 fd = open_fd;
  94
  95                 log_info("Importing '%s', saving as '%s'.", path, local);
  96         } else {
  97                 _cleanup_free_ char *pretty = NULL;
  98
  99                 fd = STDIN_FILENO;
 100
 101                 (void) readlink_malloc("/proc/self/fd/0", &pretty);
 102                 log_info("Importing '%s', saving as '%s'.", strna(pretty), local);
 103         }
 104
 105         r = sd_event_default(&event);
 106         if (r < 0)
 107                 return log_error_errno(r, "Failed to allocate event loop: %m");
 108
 109         assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, -1) >= 0);
 110         (void) sd_event_add_signal(event, NULL, SIGTERM, interrupt_signal_handler,  NULL);
 111         (void) sd_event_add_signal(event, NULL, SIGINT, interrupt_signal_handler, NULL);
 112
 113         r = tar_import_new(&import, event, arg_image_root, on_tar_finished, event);
 114         if (r < 0)
 115                 return log_error_errno(r, "Failed to allocate importer: %m");
 116
 117         r = tar_import_start(import, fd, local, arg_force, arg_read_only);
 118         if (r < 0)
 119                 return log_error_errno(r, "Failed to import image: %m");
 120
 121         r = sd_event_loop(event);
 122         if (r < 0)
 123                 return log_error_errno(r, "Failed to run event loop: %m");
 124
 125         log_info("Exiting.");
 126         return -r;
 127 }
 128
 129 static void on_raw_finished(RawImport *import, int error, void *userdata) {
 130         sd_event *event = userdata;
 131         assert(import);
 132
 133         if (error == 0)
 134                 log_info("Operation completed successfully.");
 135
 136         sd_event_exit(event, abs(error));
 137 }
 138
 139 static int import_raw(int argc, char *argv[], void *userdata) {
 140         _cleanup_(raw_import_unrefp) RawImport *import = NULL;
 141         _cleanup_(sd_event_unrefp) sd_event *event = NULL;
 142         const char *path = NULL, *local = NULL;
 143         _cleanup_free_ char *ll = NULL;
 144         _cleanup_close_ int open_fd = -1;
 145         int r, fd;
 146
 147         if (argc >= 2)
 148                 path = argv[1];
 149         if (isempty(path) || streq(path, "-"))
 150                 path = NULL;
 151
 152         if (argc >= 3)
 153                 local = argv[2];
 154         else if (path)
 155                 local = basename(path);
 156         if (isempty(local) || streq(local, "-"))
 157                 local = NULL;
 158
 159         if (local) {
 160                 r = raw_strip_suffixes(local, &ll);
 161                 if (r < 0)
 162                         return log_oom();
 163
 164                 local = ll;
 165
 166                 if (!machine_name_is_valid(local)) {
 167                         log_error("Local image name '%s' is not valid.", local);
 168                         return -EINVAL;
 169                 }
 170
 171                 if (!arg_force) {
 172                         r = image_find(IMAGE_MACHINE, local, NULL);
 173                         if (r < 0) {
 174                                 if (r != -ENOENT)
 175                                         return log_error_errno(r, "Failed to check whether image '%s' exists: %m", local);
 176                         } else {
 177                                 log_error("Image '%s' already exists.", local);
 178                                 return -EEXIST;
 179                         }
 180                 }
 181         } else
 182                 local = "imported";
 183
 184         if (path) {
 185                 open_fd = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY);
 186                 if (open_fd < 0)
 187                         return log_error_errno(errno, "Failed to open raw image to import: %m");
 188
 189                 fd = open_fd;
 190
 191                 log_info("Importing '%s', saving as '%s'.", path, local);
 192         } else {
 193                 _cleanup_free_ char *pretty = NULL;
 194
 195                 fd = STDIN_FILENO;
 196
 197                 (void) readlink_malloc("/proc/self/fd/0", &pretty);
 198                 log_info("Importing '%s', saving as '%s'.", strempty(pretty), local);
 199         }
 200
 201         r = sd_event_default(&event);
 202         if (r < 0)
 203                 return log_error_errno(r, "Failed to allocate event loop: %m");
 204
 205         assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, -1) >= 0);
 206         (void) sd_event_add_signal(event, NULL, SIGTERM, interrupt_signal_handler,  NULL);
 207         (void) sd_event_add_signal(event, NULL, SIGINT, interrupt_signal_handler, NULL);
 208
 209         r = raw_import_new(&import, event, arg_image_root, on_raw_finished, event);
 210         if (r < 0)
 211                 return log_error_errno(r, "Failed to allocate importer: %m");
 212
 213         r = raw_import_start(import, fd, local, arg_force, arg_read_only);
 214         if (r < 0)
 215                 return log_error_errno(r, "Failed to import image: %m");
 216
 217         r = sd_event_loop(event);
 218         if (r < 0)
 219                 return log_error_errno(r, "Failed to run event loop: %m");
 220
 221         log_info("Exiting.");
 222         return -r;
 223 }
 224
 225 static int help(int argc, char *argv[], void *userdata) {
 226
 227         printf("%s [OPTIONS...] {COMMAND} ...\n\n"
 228                "Import container or virtual machine images.\n\n"
 229                "  -h --help                   Show this help\n"
 230                "     --version                Show package version\n"
 231                "     --force                  Force creation of image\n"
 232                "     --image-root=PATH        Image root directory\n"
 233                "     --read-only              Create a read-only image\n\n"
 234                "Commands:\n"
 235                "  tar FILE [NAME]             Import a TAR image\n"
 236                "  raw FILE [NAME]             Import a RAW image\n",
 237                program_invocation_short_name);
 238
 239         return 0;
 240 }
 241
 242 static int parse_argv(int argc, char *argv[]) {
 243
 244         enum {
 245                 ARG_VERSION = 0x100,
 246                 ARG_FORCE,
 247                 ARG_IMAGE_ROOT,
 248                 ARG_READ_ONLY,
 249         };
 250
 251         static const struct option options[] = {
 252                 { "help",            no_argument,       NULL, 'h'                 },
 253                 { "version",         no_argument,       NULL, ARG_VERSION         },
 254                 { "force",           no_argument,       NULL, ARG_FORCE           },
 255                 { "image-root",      required_argument, NULL, ARG_IMAGE_ROOT      },
 256                 { "read-only",       no_argument,       NULL, ARG_READ_ONLY       },
 257                 {}
 258         };
 259
 260         int c;
 261
 262         assert(argc >= 0);
 263         assert(argv);
 264
 265         while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
 266
 267                 switch (c) {
 268
 269                 case 'h':
 270                         return help(0, NULL, NULL);
 271
 272                 case ARG_VERSION:
 273                         return version();
 274
 275                 case ARG_FORCE:
 276                         arg_force = true;
 277                         break;
 278
 279                 case ARG_IMAGE_ROOT:
 280                         arg_image_root = optarg;
 281                         break;
 282
 283                 case ARG_READ_ONLY:
 284                         arg_read_only = true;
 285                         break;
 286
 287                 case '?':
 288                         return -EINVAL;
 289
 290                 default:
 291                         assert_not_reached("Unhandled option");
 292                 }
 293
 294         return 1;
 295 }
 296
 297 static int import_main(int argc, char *argv[]) {
 298
 299         static const Verb verbs[] = {
 300                 { "help", VERB_ANY, VERB_ANY, 0, help       },
 301                 { "tar",  2,        3,        0, import_tar },
 302                 { "raw",  2,        3,        0, import_raw },
 303                 {}
 304         };
 305
 306         return dispatch_verb(argc, argv, verbs, NULL);
 307 }
 308
 309 int main(int argc, char *argv[]) {
 310         int r;
 311
 312         setlocale(LC_ALL, "");
 313         log_parse_environment();
 314         log_open();
 315
 316         r = parse_argv(argc, argv);
 317         if (r <= 0)
 318                 goto finish;
 319
 320         (void) ignore_signals(SIGPIPE, -1);
 321
 322         r = import_main(argc, argv);
 323
 324 finish:
 325         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 326 }