src/import/pull.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 "hostname-util.h"
  10 #include "import-util.h"
  11 #include "machine-image.h"
  12 #include "main-func.h"
  13 #include "parse-util.h"
  14 #include "pull-raw.h"
  15 #include "pull-tar.h"
  16 #include "signal-util.h"
  17 #include "string-util.h"
  18 #include "verbs.h"
  19 #include "web-util.h"
  20
  21 static bool arg_force = false;
  22 static const char *arg_image_root = "/var/lib/machines";
  23 static ImportVerify arg_verify = IMPORT_VERIFY_SIGNATURE;
  24 static bool arg_settings = true;
  25 static bool arg_roothash = true;
  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(TarPull *pull, int error, void *userdata) {
  34         sd_event *event = userdata;
  35         assert(pull);
  36
  37         if (error == 0)
  38                 log_info("Operation completed successfully.");
  39
  40         sd_event_exit(event, abs(error));
  41 }
  42
  43 static int pull_tar(int argc, char *argv[], void *userdata) {
  44         _cleanup_(tar_pull_unrefp) TarPull *pull = NULL;
  45         _cleanup_(sd_event_unrefp) sd_event *event = NULL;
  46         const char *url, *local;
  47         _cleanup_free_ char *l = NULL, *ll = NULL;
  48         int r;
  49
  50         url = argv[1];
  51         if (!http_url_is_valid(url)) {
  52                 log_error("URL '%s' is not valid.", url);
  53                 return -EINVAL;
  54         }
  55
  56         if (argc >= 3)
  57                 local = argv[2];
  58         else {
  59                 r = import_url_last_component(url, &l);
  60                 if (r < 0)
  61                         return log_error_errno(r, "Failed get final component of URL: %m");
  62
  63                 local = l;
  64         }
  65
  66         if (isempty(local) || streq(local, "-"))
  67                 local = NULL;
  68
  69         if (local) {
  70                 r = tar_strip_suffixes(local, &ll);
  71                 if (r < 0)
  72                         return log_oom();
  73
  74                 local = ll;
  75
  76                 if (!machine_name_is_valid(local)) {
  77                         log_error("Local image name '%s' is not valid.", local);
  78                         return -EINVAL;
  79                 }
  80
  81                 if (!arg_force) {
  82                         r = image_find(IMAGE_MACHINE, local, NULL);
  83                         if (r < 0) {
  84                                 if (r != -ENOENT)
  85                                         return log_error_errno(r, "Failed to check whether image '%s' exists: %m", local);
  86                         } else {
  87                                 log_error("Image '%s' already exists.", local);
  88                                 return -EEXIST;
  89                         }
  90                 }
  91
  92                 log_info("Pulling '%s', saving as '%s'.", url, local);
  93         } else
  94                 log_info("Pulling '%s'.", url);
  95
  96         r = sd_event_default(&event);
  97         if (r < 0)
  98                 return log_error_errno(r, "Failed to allocate event loop: %m");
  99
 100         assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, -1) >= 0);
 101         (void) sd_event_add_signal(event, NULL, SIGTERM, interrupt_signal_handler,  NULL);
 102         (void) sd_event_add_signal(event, NULL, SIGINT, interrupt_signal_handler, NULL);
 103
 104         r = tar_pull_new(&pull, event, arg_image_root, on_tar_finished, event);
 105         if (r < 0)
 106                 return log_error_errno(r, "Failed to allocate puller: %m");
 107
 108         r = tar_pull_start(pull, url, local, arg_force, arg_verify, arg_settings);
 109         if (r < 0)
 110                 return log_error_errno(r, "Failed to pull image: %m");
 111
 112         r = sd_event_loop(event);
 113         if (r < 0)
 114                 return log_error_errno(r, "Failed to run event loop: %m");
 115
 116         log_info("Exiting.");
 117         return -r;
 118 }
 119
 120 static void on_raw_finished(RawPull *pull, int error, void *userdata) {
 121         sd_event *event = userdata;
 122         assert(pull);
 123
 124         if (error == 0)
 125                 log_info("Operation completed successfully.");
 126
 127         sd_event_exit(event, abs(error));
 128 }
 129
 130 static int pull_raw(int argc, char *argv[], void *userdata) {
 131         _cleanup_(raw_pull_unrefp) RawPull *pull = NULL;
 132         _cleanup_(sd_event_unrefp) sd_event *event = NULL;
 133         const char *url, *local;
 134         _cleanup_free_ char *l = NULL, *ll = NULL;
 135         int r;
 136
 137         url = argv[1];
 138         if (!http_url_is_valid(url)) {
 139                 log_error("URL '%s' is not valid.", url);
 140                 return -EINVAL;
 141         }
 142
 143         if (argc >= 3)
 144                 local = argv[2];
 145         else {
 146                 r = import_url_last_component(url, &l);
 147                 if (r < 0)
 148                         return log_error_errno(r, "Failed get final component of URL: %m");
 149
 150                 local = l;
 151         }
 152
 153         if (isempty(local) || streq(local, "-"))
 154                 local = NULL;
 155
 156         if (local) {
 157                 r = raw_strip_suffixes(local, &ll);
 158                 if (r < 0)
 159                         return log_oom();
 160
 161                 local = ll;
 162
 163                 if (!machine_name_is_valid(local)) {
 164                         log_error("Local image name '%s' is not valid.", local);
 165                         return -EINVAL;
 166                 }
 167
 168                 if (!arg_force) {
 169                         r = image_find(IMAGE_MACHINE, local, NULL);
 170                         if (r < 0) {
 171                                 if (r != -ENOENT)
 172                                         return log_error_errno(r, "Failed to check whether image '%s' exists: %m", local);
 173                         } else {
 174                                 log_error("Image '%s' already exists.", local);
 175                                 return -EEXIST;
 176                         }
 177                 }
 178
 179                 log_info("Pulling '%s', saving as '%s'.", url, local);
 180         } else
 181                 log_info("Pulling '%s'.", url);
 182
 183         r = sd_event_default(&event);
 184         if (r < 0)
 185                 return log_error_errno(r, "Failed to allocate event loop: %m");
 186
 187         assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, -1) >= 0);
 188         (void) sd_event_add_signal(event, NULL, SIGTERM, interrupt_signal_handler,  NULL);
 189         (void) sd_event_add_signal(event, NULL, SIGINT, interrupt_signal_handler, NULL);
 190
 191         r = raw_pull_new(&pull, event, arg_image_root, on_raw_finished, event);
 192         if (r < 0)
 193                 return log_error_errno(r, "Failed to allocate puller: %m");
 194
 195         r = raw_pull_start(pull, url, local, arg_force, arg_verify, arg_settings, arg_roothash);
 196         if (r < 0)
 197                 return log_error_errno(r, "Failed to pull image: %m");
 198
 199         r = sd_event_loop(event);
 200         if (r < 0)
 201                 return log_error_errno(r, "Failed to run event loop: %m");
 202
 203         log_info("Exiting.");
 204         return -r;
 205 }
 206
 207 static int help(int argc, char *argv[], void *userdata) {
 208
 209         printf("%s [OPTIONS...] {COMMAND} ...\n\n"
 210                "Download container or virtual machine images.\n\n"
 211                "  -h --help                   Show this help\n"
 212                "     --version                Show package version\n"
 213                "     --force                  Force creation of image\n"
 214                "     --verify=MODE            Verify downloaded image, one of: 'no',\n"
 215                "                              'checksum', 'signature'\n"
 216                "     --settings=BOOL          Download settings file with image\n"
 217                "     --roothash=BOOL          Download root hash file with image\n"
 218                "     --image-root=PATH        Image root directory\n\n"
 219                "Commands:\n"
 220                "  tar URL [NAME]              Download a TAR image\n"
 221                "  raw URL [NAME]              Download a RAW image\n",
 222                program_invocation_short_name);
 223
 224         return 0;
 225 }
 226
 227 static int parse_argv(int argc, char *argv[]) {
 228
 229         enum {
 230                 ARG_VERSION = 0x100,
 231                 ARG_FORCE,
 232                 ARG_IMAGE_ROOT,
 233                 ARG_VERIFY,
 234                 ARG_SETTINGS,
 235                 ARG_ROOTHASH,
 236         };
 237
 238         static const struct option options[] = {
 239                 { "help",            no_argument,       NULL, 'h'                 },
 240                 { "version",         no_argument,       NULL, ARG_VERSION         },
 241                 { "force",           no_argument,       NULL, ARG_FORCE           },
 242                 { "image-root",      required_argument, NULL, ARG_IMAGE_ROOT      },
 243                 { "verify",          required_argument, NULL, ARG_VERIFY          },
 244                 { "settings",        required_argument, NULL, ARG_SETTINGS        },
 245                 { "roothash",        required_argument, NULL, ARG_ROOTHASH        },
 246                 {}
 247         };
 248
 249         int c, r;
 250
 251         assert(argc >= 0);
 252         assert(argv);
 253
 254         while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
 255
 256                 switch (c) {
 257
 258                 case 'h':
 259                         return help(0, NULL, NULL);
 260
 261                 case ARG_VERSION:
 262                         return version();
 263
 264                 case ARG_FORCE:
 265                         arg_force = true;
 266                         break;
 267
 268                 case ARG_IMAGE_ROOT:
 269                         arg_image_root = optarg;
 270                         break;
 271
 272                 case ARG_VERIFY:
 273                         arg_verify = import_verify_from_string(optarg);
 274                         if (arg_verify < 0)
 275                                 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
 276                                                        "Invalid verification setting '%s'", optarg);
 277
 278                         break;
 279
 280                 case ARG_SETTINGS:
 281                         r = parse_boolean(optarg);
 282                         if (r < 0)
 283                                 return log_error_errno(r, "Failed to parse --settings= parameter '%s': %m", optarg);
 284
 285                         arg_settings = r;
 286                         break;
 287
 288                 case ARG_ROOTHASH:
 289                         r = parse_boolean(optarg);
 290                         if (r < 0)
 291                                 return log_error_errno(r, "Failed to parse --roothash= parameter '%s': %m", optarg);
 292
 293                         arg_roothash = r;
 294                         break;
 295
 296                 case '?':
 297                         return -EINVAL;
 298
 299                 default:
 300                         assert_not_reached("Unhandled option");
 301                 }
 302
 303         return 1;
 304 }
 305
 306 static int pull_main(int argc, char *argv[]) {
 307         static const Verb verbs[] = {
 308                 { "help", VERB_ANY, VERB_ANY, 0, help     },
 309                 { "tar",  2,        3,        0, pull_tar },
 310                 { "raw",  2,        3,        0, pull_raw },
 311                 {}
 312         };
 313
 314         return dispatch_verb(argc, argv, verbs, NULL);
 315 }
 316
 317 static int run(int argc, char *argv[]) {
 318         int r;
 319
 320         setlocale(LC_ALL, "");
 321         log_parse_environment();
 322         log_open();
 323
 324         r = parse_argv(argc, argv);
 325         if (r <= 0)
 326                 return r;
 327
 328         (void) ignore_signals(SIGPIPE, -1);
 329
 330         return pull_main(argc, argv);
 331 }
 332
 333 DEFINE_MAIN_FUNCTION(run);