src/import/import.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   This file is part of systemd.
   4
   5   Copyright 2015 Lennart Poettering
   6 ***/
   7
   8 #include <getopt.h>
   9
  10 #include "sd-event.h"
  11 #include "sd-id128.h"
  12
  13 #include "alloc-util.h"
  14 #include "fd-util.h"
  15 #include "fs-util.h"
  16 #include "hostname-util.h"
  17 #include "import-raw.h"
  18 #include "import-tar.h"
  19 #include "import-util.h"
  20 #include "machine-image.h"
  21 #include "signal-util.h"
  22 #include "string-util.h"
  23 #include "verbs.h"
  24
  25 static bool arg_force = false;
  26 static bool arg_read_only = false;
  27 static const char *arg_image_root = "/var/lib/machines";
  28
  29 static int interrupt_signal_handler(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
  30         log_notice("Transfer aborted.");
  31         sd_event_exit(sd_event_source_get_event(s), EINTR);
  32         return 0;
  33 }
  34
  35 static void on_tar_finished(TarImport *import, int error, void *userdata) {
  36         sd_event *event = userdata;
  37         assert(import);
  38
  39         if (error == 0)
  40                 log_info("Operation completed successfully.");
  41
  42         sd_event_exit(event, abs(error));
  43 }
  44
  45 static int import_tar(int argc, char *argv[], void *userdata) {
  46         _cleanup_(tar_import_unrefp) TarImport *import = NULL;
  47         _cleanup_(sd_event_unrefp) sd_event *event = NULL;
  48         const char *path = NULL, *local = NULL;
  49         _cleanup_free_ char *ll = NULL;
  50         _cleanup_close_ int open_fd = -1;
  51         int r, fd;
  52
  53         if (argc >= 2)
  54                 path = argv[1];
  55         if (isempty(path) || streq(path, "-"))
  56                 path = NULL;
  57
  58         if (argc >= 3)
  59                 local = argv[2];
  60         else if (path)
  61                 local = basename(path);
  62         if (isempty(local) || streq(local, "-"))
  63                 local = NULL;
  64
  65         if (local) {
  66                 r = tar_strip_suffixes(local, &ll);
  67                 if (r < 0)
  68                         return log_oom();
  69
  70                 local = ll;
  71
  72                 if (!machine_name_is_valid(local)) {
  73                         log_error("Local image name '%s' is not valid.", local);
  74                         return -EINVAL;
  75                 }
  76
  77                 if (!arg_force) {
  78                         r = image_find(local, NULL);
  79                         if (r < 0)
  80                                 return log_error_errno(r, "Failed to check whether image '%s' exists: %m", local);
  81                         else if (r > 0) {
  82                                 log_error("Image '%s' already exists.", local);
  83                                 return -EEXIST;
  84                         }
  85                 }
  86         } else
  87                 local = "imported";
  88
  89         if (path) {
  90                 open_fd = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY);
  91                 if (open_fd < 0)
  92                         return log_error_errno(errno, "Failed to open tar image to import: %m");
  93
  94                 fd = open_fd;
  95
  96                 log_info("Importing '%s', saving as '%s'.", path, local);
  97         } else {
  98                 _cleanup_free_ char *pretty = NULL;
  99
 100                 fd = STDIN_FILENO;
 101
 102                 (void) readlink_malloc("/proc/self/fd/0", &pretty);
 103                 log_info("Importing '%s', saving as '%s'.", strna(pretty), local);
 104         }
 105
 106         r = sd_event_default(&event);
 107         if (r < 0)
 108                 return log_error_errno(r, "Failed to allocate event loop: %m");
 109
 110         assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, -1) >= 0);
 111         (void) sd_event_add_signal(event, NULL, SIGTERM, interrupt_signal_handler,  NULL);
 112         (void) sd_event_add_signal(event, NULL, SIGINT, interrupt_signal_handler, NULL);
 113
 114         r = tar_import_new(&import, event, arg_image_root, on_tar_finished, event);
 115         if (r < 0)
 116                 return log_error_errno(r, "Failed to allocate importer: %m");
 117
 118         r = tar_import_start(import, fd, local, arg_force, arg_read_only);
 119         if (r < 0)
 120                 return log_error_errno(r, "Failed to import image: %m");
 121
 122         r = sd_event_loop(event);
 123         if (r < 0)
 124                 return log_error_errno(r, "Failed to run event loop: %m");
 125
 126         log_info("Exiting.");
 127         return -r;
 128 }
 129
 130 static void on_raw_finished(RawImport *import, int error, void *userdata) {
 131         sd_event *event = userdata;
 132         assert(import);
 133
 134         if (error == 0)
 135                 log_info("Operation completed successfully.");
 136
 137         sd_event_exit(event, abs(error));
 138 }
 139
 140 static int import_raw(int argc, char *argv[], void *userdata) {
 141         _cleanup_(raw_import_unrefp) RawImport *import = NULL;
 142         _cleanup_(sd_event_unrefp) sd_event *event = NULL;
 143         const char *path = NULL, *local = NULL;
 144         _cleanup_free_ char *ll = NULL;
 145         _cleanup_close_ int open_fd = -1;
 146         int r, fd;
 147
 148         if (argc >= 2)
 149                 path = argv[1];
 150         if (isempty(path) || streq(path, "-"))
 151                 path = NULL;
 152
 153         if (argc >= 3)
 154                 local = argv[2];
 155         else if (path)
 156                 local = basename(path);
 157         if (isempty(local) || streq(local, "-"))
 158                 local = NULL;
 159
 160         if (local) {
 161                 r = raw_strip_suffixes(local, &ll);
 162                 if (r < 0)
 163                         return log_oom();
 164
 165                 local = ll;
 166
 167                 if (!machine_name_is_valid(local)) {
 168                         log_error("Local image name '%s' is not valid.", local);
 169                         return -EINVAL;
 170                 }
 171
 172                 if (!arg_force) {
 173                         r = image_find(local, NULL);
 174                         if (r < 0)
 175                                 return log_error_errno(r, "Failed to check whether image '%s' exists: %m", local);
 176                         else if (r > 0) {
 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'.", 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 }