src/import/pull.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2014 Lennart Poettering
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include <getopt.h>
  21
  22 #include "sd-event.h"
  23
  24 #include "alloc-util.h"
  25 #include "hostname-util.h"
  26 #include "import-util.h"
  27 #include "machine-image.h"
  28 #include "parse-util.h"
  29 #include "pull-raw.h"
  30 #include "pull-tar.h"
  31 #include "signal-util.h"
  32 #include "string-util.h"
  33 #include "verbs.h"
  34 #include "web-util.h"
  35
  36 static bool arg_force = false;
  37 static const char *arg_image_root = "/var/lib/machines";
  38 static ImportVerify arg_verify = IMPORT_VERIFY_SIGNATURE;
  39 static bool arg_settings = true;
  40
  41 static int interrupt_signal_handler(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
  42         log_notice("Transfer aborted.");
  43         sd_event_exit(sd_event_source_get_event(s), EINTR);
  44         return 0;
  45 }
  46
  47 static void on_tar_finished(TarPull *pull, int error, void *userdata) {
  48         sd_event *event = userdata;
  49         assert(pull);
  50
  51         if (error == 0)
  52                 log_info("Operation completed successfully.");
  53
  54         sd_event_exit(event, abs(error));
  55 }
  56
  57 static int pull_tar(int argc, char *argv[], void *userdata) {
  58         _cleanup_(tar_pull_unrefp) TarPull *pull = NULL;
  59         _cleanup_(sd_event_unrefp) sd_event *event = NULL;
  60         const char *url, *local;
  61         _cleanup_free_ char *l = NULL, *ll = NULL;
  62         int r;
  63
  64         url = argv[1];
  65         if (!http_url_is_valid(url)) {
  66                 log_error("URL '%s' is not valid.", url);
  67                 return -EINVAL;
  68         }
  69
  70         if (argc >= 3)
  71                 local = argv[2];
  72         else {
  73                 r = import_url_last_component(url, &l);
  74                 if (r < 0)
  75                         return log_error_errno(r, "Failed get final component of URL: %m");
  76
  77                 local = l;
  78         }
  79
  80         if (isempty(local) || streq(local, "-"))
  81                 local = NULL;
  82
  83         if (local) {
  84                 r = tar_strip_suffixes(local, &ll);
  85                 if (r < 0)
  86                         return log_oom();
  87
  88                 local = ll;
  89
  90                 if (!machine_name_is_valid(local)) {
  91                         log_error("Local image name '%s' is not valid.", local);
  92                         return -EINVAL;
  93                 }
  94
  95                 if (!arg_force) {
  96                         r = image_find(local, NULL);
  97                         if (r < 0)
  98                                 return log_error_errno(r, "Failed to check whether image '%s' exists: %m", local);
  99                         else if (r > 0) {
 100                                 log_error("Image '%s' already exists.", local);
 101                                 return -EEXIST;
 102                         }
 103                 }
 104
 105                 log_info("Pulling '%s', saving as '%s'.", url, local);
 106         } else
 107                 log_info("Pulling '%s'.", url);
 108
 109         r = sd_event_default(&event);
 110         if (r < 0)
 111                 return log_error_errno(r, "Failed to allocate event loop: %m");
 112
 113         assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, -1) >= 0);
 114         (void) sd_event_add_signal(event, NULL, SIGTERM, interrupt_signal_handler,  NULL);
 115         (void) sd_event_add_signal(event, NULL, SIGINT, interrupt_signal_handler, NULL);
 116
 117         r = tar_pull_new(&pull, event, arg_image_root, on_tar_finished, event);
 118         if (r < 0)
 119                 return log_error_errno(r, "Failed to allocate puller: %m");
 120
 121         r = tar_pull_start(pull, url, local, arg_force, arg_verify, arg_settings);
 122         if (r < 0)
 123                 return log_error_errno(r, "Failed to pull image: %m");
 124
 125         r = sd_event_loop(event);
 126         if (r < 0)
 127                 return log_error_errno(r, "Failed to run event loop: %m");
 128
 129         log_info("Exiting.");
 130         return -r;
 131 }
 132
 133 static void on_raw_finished(RawPull *pull, int error, void *userdata) {
 134         sd_event *event = userdata;
 135         assert(pull);
 136
 137         if (error == 0)
 138                 log_info("Operation completed successfully.");
 139
 140         sd_event_exit(event, abs(error));
 141 }
 142
 143 static int pull_raw(int argc, char *argv[], void *userdata) {
 144         _cleanup_(raw_pull_unrefp) RawPull *pull = NULL;
 145         _cleanup_(sd_event_unrefp) sd_event *event = NULL;
 146         const char *url, *local;
 147         _cleanup_free_ char *l = NULL, *ll = NULL;
 148         int r;
 149
 150         url = argv[1];
 151         if (!http_url_is_valid(url)) {
 152                 log_error("URL '%s' is not valid.", url);
 153                 return -EINVAL;
 154         }
 155
 156         if (argc >= 3)
 157                 local = argv[2];
 158         else {
 159                 r = import_url_last_component(url, &l);
 160                 if (r < 0)
 161                         return log_error_errno(r, "Failed get final component of URL: %m");
 162
 163                 local = l;
 164         }
 165
 166         if (isempty(local) || streq(local, "-"))
 167                 local = NULL;
 168
 169         if (local) {
 170                 r = raw_strip_suffixes(local, &ll);
 171                 if (r < 0)
 172                         return log_oom();
 173
 174                 local = ll;
 175
 176                 if (!machine_name_is_valid(local)) {
 177                         log_error("Local image name '%s' is not valid.", local);
 178                         return -EINVAL;
 179                 }
 180
 181                 if (!arg_force) {
 182                         r = image_find(local, NULL);
 183                         if (r < 0)
 184                                 return log_error_errno(r, "Failed to check whether image '%s' exists: %m", local);
 185                         else if (r > 0) {
 186                                 log_error("Image '%s' already exists.", local);
 187                                 return -EEXIST;
 188                         }
 189                 }
 190
 191                 log_info("Pulling '%s', saving as '%s'.", url, local);
 192         } else
 193                 log_info("Pulling '%s'.", url);
 194
 195         r = sd_event_default(&event);
 196         if (r < 0)
 197                 return log_error_errno(r, "Failed to allocate event loop: %m");
 198
 199         assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, -1) >= 0);
 200         (void) sd_event_add_signal(event, NULL, SIGTERM, interrupt_signal_handler,  NULL);
 201         (void) sd_event_add_signal(event, NULL, SIGINT, interrupt_signal_handler, NULL);
 202
 203         r = raw_pull_new(&pull, event, arg_image_root, on_raw_finished, event);
 204         if (r < 0)
 205                 return log_error_errno(r, "Failed to allocate puller: %m");
 206
 207         r = raw_pull_start(pull, url, local, arg_force, arg_verify, arg_settings);
 208         if (r < 0)
 209                 return log_error_errno(r, "Failed to pull image: %m");
 210
 211         r = sd_event_loop(event);
 212         if (r < 0)
 213                 return log_error_errno(r, "Failed to run event loop: %m");
 214
 215         log_info("Exiting.");
 216         return -r;
 217 }
 218
 219 static int help(int argc, char *argv[], void *userdata) {
 220
 221         printf("%s [OPTIONS...] {COMMAND} ...\n\n"
 222                "Download container or virtual machine images.\n\n"
 223                "  -h --help                   Show this help\n"
 224                "     --version                Show package version\n"
 225                "     --force                  Force creation of image\n"
 226                "     --verify=MODE            Verify downloaded image, one of: 'no',\n"
 227                "                              'checksum', 'signature'\n"
 228                "     --settings=BOOL          Download settings file with image\n"
 229                "     --image-root=PATH        Image root directory\n\n"
 230                "Commands:\n"
 231                "  tar URL [NAME]              Download a TAR image\n"
 232                "  raw URL [NAME]              Download a RAW image\n",
 233                program_invocation_short_name);
 234
 235         return 0;
 236 }
 237
 238 static int parse_argv(int argc, char *argv[]) {
 239
 240         enum {
 241                 ARG_VERSION = 0x100,
 242                 ARG_FORCE,
 243                 ARG_IMAGE_ROOT,
 244                 ARG_VERIFY,
 245                 ARG_SETTINGS,
 246         };
 247
 248         static const struct option options[] = {
 249                 { "help",            no_argument,       NULL, 'h'                 },
 250                 { "version",         no_argument,       NULL, ARG_VERSION         },
 251                 { "force",           no_argument,       NULL, ARG_FORCE           },
 252                 { "image-root",      required_argument, NULL, ARG_IMAGE_ROOT      },
 253                 { "verify",          required_argument, NULL, ARG_VERIFY          },
 254                 { "settings",        required_argument, NULL, ARG_SETTINGS        },
 255                 {}
 256         };
 257
 258         int c, r;
 259
 260         assert(argc >= 0);
 261         assert(argv);
 262
 263         while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
 264
 265                 switch (c) {
 266
 267                 case 'h':
 268                         return help(0, NULL, NULL);
 269
 270                 case ARG_VERSION:
 271                         return version();
 272
 273                 case ARG_FORCE:
 274                         arg_force = true;
 275                         break;
 276
 277                 case ARG_IMAGE_ROOT:
 278                         arg_image_root = optarg;
 279                         break;
 280
 281                 case ARG_VERIFY:
 282                         arg_verify = import_verify_from_string(optarg);
 283                         if (arg_verify < 0) {
 284                                 log_error("Invalid verification setting '%s'", optarg);
 285                                 return -EINVAL;
 286                         }
 287
 288                         break;
 289
 290                 case ARG_SETTINGS:
 291                         r = parse_boolean(optarg);
 292                         if (r < 0)
 293                                 return log_error_errno(r, "Failed to parse --settings= parameter '%s'", optarg);
 294
 295                         arg_settings = r;
 296                         break;
 297
 298                 case '?':
 299                         return -EINVAL;
 300
 301                 default:
 302                         assert_not_reached("Unhandled option");
 303                 }
 304
 305         return 1;
 306 }
 307
 308 static int pull_main(int argc, char *argv[]) {
 309
 310         static const Verb verbs[] = {
 311                 { "help", VERB_ANY, VERB_ANY, 0, help     },
 312                 { "tar",  2,        3,        0, pull_tar },
 313                 { "raw",  2,        3,        0, pull_raw },
 314                 {}
 315         };
 316
 317         return dispatch_verb(argc, argv, verbs, NULL);
 318 }
 319
 320 int main(int argc, char *argv[]) {
 321         int r;
 322
 323         setlocale(LC_ALL, "");
 324         log_parse_environment();
 325         log_open();
 326
 327         r = parse_argv(argc, argv);
 328         if (r <= 0)
 329                 goto finish;
 330
 331         (void) ignore_signals(SIGPIPE, -1);
 332
 333         r = pull_main(argc, argv);
 334
 335 finish:
 336         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 337 }