src/import/pull.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   This file is part of systemd.
   4
   5   Copyright 2014 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 "hostname-util.h"
  15 #include "import-util.h"
  16 #include "machine-image.h"
  17 #include "parse-util.h"
  18 #include "pull-raw.h"
  19 #include "pull-tar.h"
  20 #include "signal-util.h"
  21 #include "string-util.h"
  22 #include "verbs.h"
  23 #include "web-util.h"
  24
  25 static bool arg_force = false;
  26 static const char *arg_image_root = "/var/lib/machines";
  27 static ImportVerify arg_verify = IMPORT_VERIFY_SIGNATURE;
  28 static bool arg_settings = true;
  29 static bool arg_roothash = true;
  30
  31 static int interrupt_signal_handler(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
  32         log_notice("Transfer aborted.");
  33         sd_event_exit(sd_event_source_get_event(s), EINTR);
  34         return 0;
  35 }
  36
  37 static void on_tar_finished(TarPull *pull, int error, void *userdata) {
  38         sd_event *event = userdata;
  39         assert(pull);
  40
  41         if (error == 0)
  42                 log_info("Operation completed successfully.");
  43
  44         sd_event_exit(event, abs(error));
  45 }
  46
  47 static int pull_tar(int argc, char *argv[], void *userdata) {
  48         _cleanup_(tar_pull_unrefp) TarPull *pull = NULL;
  49         _cleanup_(sd_event_unrefp) sd_event *event = NULL;
  50         const char *url, *local;
  51         _cleanup_free_ char *l = NULL, *ll = NULL;
  52         int r;
  53
  54         url = argv[1];
  55         if (!http_url_is_valid(url)) {
  56                 log_error("URL '%s' is not valid.", url);
  57                 return -EINVAL;
  58         }
  59
  60         if (argc >= 3)
  61                 local = argv[2];
  62         else {
  63                 r = import_url_last_component(url, &l);
  64                 if (r < 0)
  65                         return log_error_errno(r, "Failed get final component of URL: %m");
  66
  67                 local = l;
  68         }
  69
  70         if (isempty(local) || streq(local, "-"))
  71                 local = NULL;
  72
  73         if (local) {
  74                 r = tar_strip_suffixes(local, &ll);
  75                 if (r < 0)
  76                         return log_oom();
  77
  78                 local = ll;
  79
  80                 if (!machine_name_is_valid(local)) {
  81                         log_error("Local image name '%s' is not valid.", local);
  82                         return -EINVAL;
  83                 }
  84
  85                 if (!arg_force) {
  86                         r = image_find(local, NULL);
  87                         if (r < 0)
  88                                 return log_error_errno(r, "Failed to check whether image '%s' exists: %m", local);
  89                         else if (r > 0) {
  90                                 log_error("Image '%s' already exists.", local);
  91                                 return -EEXIST;
  92                         }
  93                 }
  94
  95                 log_info("Pulling '%s', saving as '%s'.", url, local);
  96         } else
  97                 log_info("Pulling '%s'.", url);
  98
  99         r = sd_event_default(&event);
 100         if (r < 0)
 101                 return log_error_errno(r, "Failed to allocate event loop: %m");
 102
 103         assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, -1) >= 0);
 104         (void) sd_event_add_signal(event, NULL, SIGTERM, interrupt_signal_handler,  NULL);
 105         (void) sd_event_add_signal(event, NULL, SIGINT, interrupt_signal_handler, NULL);
 106
 107         r = tar_pull_new(&pull, event, arg_image_root, on_tar_finished, event);
 108         if (r < 0)
 109                 return log_error_errno(r, "Failed to allocate puller: %m");
 110
 111         r = tar_pull_start(pull, url, local, arg_force, arg_verify, arg_settings);
 112         if (r < 0)
 113                 return log_error_errno(r, "Failed to pull image: %m");
 114
 115         r = sd_event_loop(event);
 116         if (r < 0)
 117                 return log_error_errno(r, "Failed to run event loop: %m");
 118
 119         log_info("Exiting.");
 120         return -r;
 121 }
 122
 123 static void on_raw_finished(RawPull *pull, int error, void *userdata) {
 124         sd_event *event = userdata;
 125         assert(pull);
 126
 127         if (error == 0)
 128                 log_info("Operation completed successfully.");
 129
 130         sd_event_exit(event, abs(error));
 131 }
 132
 133 static int pull_raw(int argc, char *argv[], void *userdata) {
 134         _cleanup_(raw_pull_unrefp) RawPull *pull = NULL;
 135         _cleanup_(sd_event_unrefp) sd_event *event = NULL;
 136         const char *url, *local;
 137         _cleanup_free_ char *l = NULL, *ll = NULL;
 138         int r;
 139
 140         url = argv[1];
 141         if (!http_url_is_valid(url)) {
 142                 log_error("URL '%s' is not valid.", url);
 143                 return -EINVAL;
 144         }
 145
 146         if (argc >= 3)
 147                 local = argv[2];
 148         else {
 149                 r = import_url_last_component(url, &l);
 150                 if (r < 0)
 151                         return log_error_errno(r, "Failed get final component of URL: %m");
 152
 153                 local = l;
 154         }
 155
 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(local, NULL);
 173                         if (r < 0)
 174                                 return log_error_errno(r, "Failed to check whether image '%s' exists: %m", local);
 175                         else if (r > 0) {
 176                                 log_error("Image '%s' already exists.", local);
 177                                 return -EEXIST;
 178                         }
 179                 }
 180
 181                 log_info("Pulling '%s', saving as '%s'.", url, local);
 182         } else
 183                 log_info("Pulling '%s'.", url);
 184
 185         r = sd_event_default(&event);
 186         if (r < 0)
 187                 return log_error_errno(r, "Failed to allocate event loop: %m");
 188
 189         assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, -1) >= 0);
 190         (void) sd_event_add_signal(event, NULL, SIGTERM, interrupt_signal_handler,  NULL);
 191         (void) sd_event_add_signal(event, NULL, SIGINT, interrupt_signal_handler, NULL);
 192
 193         r = raw_pull_new(&pull, event, arg_image_root, on_raw_finished, event);
 194         if (r < 0)
 195                 return log_error_errno(r, "Failed to allocate puller: %m");
 196
 197         r = raw_pull_start(pull, url, local, arg_force, arg_verify, arg_settings, arg_roothash);
 198         if (r < 0)
 199                 return log_error_errno(r, "Failed to pull image: %m");
 200
 201         r = sd_event_loop(event);
 202         if (r < 0)
 203                 return log_error_errno(r, "Failed to run event loop: %m");
 204
 205         log_info("Exiting.");
 206         return -r;
 207 }
 208
 209 static int help(int argc, char *argv[], void *userdata) {
 210
 211         printf("%s [OPTIONS...] {COMMAND} ...\n\n"
 212                "Download container or virtual machine images.\n\n"
 213                "  -h --help                   Show this help\n"
 214                "     --version                Show package version\n"
 215                "     --force                  Force creation of image\n"
 216                "     --verify=MODE            Verify downloaded image, one of: 'no',\n"
 217                "                              'checksum', 'signature'\n"
 218                "     --settings=BOOL          Download settings file with image\n"
 219                "     --roothash=BOOL          Download root hash file with image\n"
 220                "     --image-root=PATH        Image root directory\n\n"
 221                "Commands:\n"
 222                "  tar URL [NAME]              Download a TAR image\n"
 223                "  raw URL [NAME]              Download a RAW image\n",
 224                program_invocation_short_name);
 225
 226         return 0;
 227 }
 228
 229 static int parse_argv(int argc, char *argv[]) {
 230
 231         enum {
 232                 ARG_VERSION = 0x100,
 233                 ARG_FORCE,
 234                 ARG_IMAGE_ROOT,
 235                 ARG_VERIFY,
 236                 ARG_SETTINGS,
 237                 ARG_ROOTHASH,
 238         };
 239
 240         static const struct option options[] = {
 241                 { "help",            no_argument,       NULL, 'h'                 },
 242                 { "version",         no_argument,       NULL, ARG_VERSION         },
 243                 { "force",           no_argument,       NULL, ARG_FORCE           },
 244                 { "image-root",      required_argument, NULL, ARG_IMAGE_ROOT      },
 245                 { "verify",          required_argument, NULL, ARG_VERIFY          },
 246                 { "settings",        required_argument, NULL, ARG_SETTINGS        },
 247                 { "roothash",        required_argument, NULL, ARG_ROOTHASH        },
 248                 {}
 249         };
 250
 251         int c, r;
 252
 253         assert(argc >= 0);
 254         assert(argv);
 255
 256         while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
 257
 258                 switch (c) {
 259
 260                 case 'h':
 261                         return help(0, NULL, NULL);
 262
 263                 case ARG_VERSION:
 264                         return version();
 265
 266                 case ARG_FORCE:
 267                         arg_force = true;
 268                         break;
 269
 270                 case ARG_IMAGE_ROOT:
 271                         arg_image_root = optarg;
 272                         break;
 273
 274                 case ARG_VERIFY:
 275                         arg_verify = import_verify_from_string(optarg);
 276                         if (arg_verify < 0) {
 277                                 log_error("Invalid verification setting '%s'", optarg);
 278                                 return -EINVAL;
 279                         }
 280
 281                         break;
 282
 283                 case ARG_SETTINGS:
 284                         r = parse_boolean(optarg);
 285                         if (r < 0)
 286                                 return log_error_errno(r, "Failed to parse --settings= parameter '%s'", optarg);
 287
 288                         arg_settings = r;
 289                         break;
 290
 291                 case ARG_ROOTHASH:
 292                         r = parse_boolean(optarg);
 293                         if (r < 0)
 294                                 return log_error_errno(r, "Failed to parse --roothash= parameter '%s'", optarg);
 295
 296                         arg_roothash = r;
 297                         break;
 298
 299                 case '?':
 300                         return -EINVAL;
 301
 302                 default:
 303                         assert_not_reached("Unhandled option");
 304                 }
 305
 306         return 1;
 307 }
 308
 309 static int pull_main(int argc, char *argv[]) {
 310
 311         static const Verb verbs[] = {
 312                 { "help", VERB_ANY, VERB_ANY, 0, help     },
 313                 { "tar",  2,        3,        0, pull_tar },
 314                 { "raw",  2,        3,        0, pull_raw },
 315                 {}
 316         };
 317
 318         return dispatch_verb(argc, argv, verbs, NULL);
 319 }
 320
 321 int main(int argc, char *argv[]) {
 322         int r;
 323
 324         setlocale(LC_ALL, "");
 325         log_parse_environment();
 326         log_open();
 327
 328         r = parse_argv(argc, argv);
 329         if (r <= 0)
 330                 goto finish;
 331
 332         (void) ignore_signals(SIGPIPE, -1);
 333
 334         r = pull_main(argc, argv);
 335
 336 finish:
 337         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 338 }