310 lines
10 KiB
C
310 lines
10 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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/***
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This file is part of systemd.
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Copyright 2016 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <fcntl.h>
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#include <stdio.h>
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#include <getopt.h>
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#include "architecture.h"
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#include "dissect-image.h"
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#include "hexdecoct.h"
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#include "log.h"
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#include "loop-util.h"
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#include "string-util.h"
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#include "strv.h"
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#include "user-util.h"
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#include "util.h"
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static enum {
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ACTION_DISSECT,
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ACTION_MOUNT,
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} arg_action = ACTION_DISSECT;
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static const char *arg_image = NULL;
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static const char *arg_path = NULL;
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static DissectImageFlags arg_flags = DISSECT_IMAGE_REQUIRE_ROOT|DISSECT_IMAGE_DISCARD_ON_LOOP;
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static void *arg_root_hash = NULL;
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static size_t arg_root_hash_size = 0;
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static void help(void) {
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printf("%s [OPTIONS...] IMAGE\n"
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"%s [OPTIONS...] --mount IMAGE PATH\n"
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"Dissect a file system OS image.\n\n"
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" -h --help Show this help\n"
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" --version Show package version\n"
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" -m --mount Mount the image to the specified directory\n"
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" -r --read-only Mount read-only\n"
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" --discard=MODE Choose 'discard' mode (disabled, loop, all, crypto)\n"
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" --root-hash=HASH Specify root hash for verity\n",
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program_invocation_short_name,
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program_invocation_short_name);
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}
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static int parse_argv(int argc, char *argv[]) {
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enum {
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ARG_VERSION = 0x100,
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ARG_DISCARD,
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ARG_ROOT_HASH,
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};
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static const struct option options[] = {
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{ "help", no_argument, NULL, 'h' },
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{ "version", no_argument, NULL, ARG_VERSION },
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{ "mount", no_argument, NULL, 'm' },
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{ "read-only", no_argument, NULL, 'r' },
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{ "discard", required_argument, NULL, ARG_DISCARD },
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{ "root-hash", required_argument, NULL, ARG_ROOT_HASH },
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{}
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};
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int c, r;
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assert(argc >= 0);
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assert(argv);
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while ((c = getopt_long(argc, argv, "hmr", options, NULL)) >= 0) {
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switch (c) {
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case 'h':
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help();
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return 0;
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case ARG_VERSION:
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return version();
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case 'm':
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arg_action = ACTION_MOUNT;
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break;
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case 'r':
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arg_flags |= DISSECT_IMAGE_READ_ONLY;
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break;
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case ARG_DISCARD: {
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DissectImageFlags flags;
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if (streq(optarg, "disabled"))
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flags = 0;
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else if (streq(optarg, "loop"))
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flags = DISSECT_IMAGE_DISCARD_ON_LOOP;
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else if (streq(optarg, "all"))
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flags = DISSECT_IMAGE_DISCARD_ON_LOOP | DISSECT_IMAGE_DISCARD;
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else if (streq(optarg, "crypt"))
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flags = DISSECT_IMAGE_DISCARD_ANY;
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else {
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log_error("Unknown --discard= parameter: %s", optarg);
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return -EINVAL;
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}
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arg_flags = (arg_flags & ~DISSECT_IMAGE_DISCARD_ANY) | flags;
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break;
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}
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case ARG_ROOT_HASH: {
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void *p;
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size_t l;
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r = unhexmem(optarg, strlen(optarg), &p, &l);
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if (r < 0)
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return log_error_errno(r, "Failed to parse root hash: %s", optarg);
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if (l < sizeof(sd_id128_t)) {
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log_error("Root hash must be at least 128bit long: %s", optarg);
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free(p);
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return -EINVAL;
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}
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free(arg_root_hash);
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arg_root_hash = p;
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arg_root_hash_size = l;
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break;
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}
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case '?':
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return -EINVAL;
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default:
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assert_not_reached("Unhandled option");
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}
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}
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switch (arg_action) {
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case ACTION_DISSECT:
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if (optind + 1 != argc) {
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log_error("Expected a file path as only argument.");
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return -EINVAL;
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}
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arg_image = argv[optind];
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arg_flags |= DISSECT_IMAGE_READ_ONLY;
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break;
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case ACTION_MOUNT:
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if (optind + 2 != argc) {
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log_error("Expected a file path and mount point path as only arguments.");
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return -EINVAL;
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}
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arg_image = argv[optind];
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arg_path = argv[optind + 1];
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break;
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default:
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assert_not_reached("Unknown action.");
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}
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return 1;
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}
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int main(int argc, char *argv[]) {
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_cleanup_(loop_device_unrefp) LoopDevice *d = NULL;
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_cleanup_(decrypted_image_unrefp) DecryptedImage *di = NULL;
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_cleanup_(dissected_image_unrefp) DissectedImage *m = NULL;
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int r;
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log_parse_environment();
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log_open();
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r = parse_argv(argc, argv);
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if (r <= 0)
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goto finish;
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r = loop_device_make_by_path(arg_image, (arg_flags & DISSECT_IMAGE_READ_ONLY) ? O_RDONLY : O_RDWR, &d);
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if (r < 0) {
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log_error_errno(r, "Failed to set up loopback device: %m");
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goto finish;
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}
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if (!arg_root_hash) {
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r = root_hash_load(arg_image, &arg_root_hash, &arg_root_hash_size);
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if (r < 0) {
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log_error_errno(r, "Failed to read root hash file for %s: %m", arg_image);
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goto finish;
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}
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}
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r = dissect_image_and_warn(d->fd, arg_image, arg_root_hash, arg_root_hash_size, arg_flags, &m);
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if (r < 0)
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goto finish;
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switch (arg_action) {
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case ACTION_DISSECT: {
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unsigned i;
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for (i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) {
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DissectedPartition *p = m->partitions + i;
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int k;
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if (!p->found)
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continue;
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printf("Found %s '%s' partition",
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p->rw ? "writable" : "read-only",
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partition_designator_to_string(i));
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if (!sd_id128_is_null(p->uuid))
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printf(" (UUID " SD_ID128_FORMAT_STR ")", SD_ID128_FORMAT_VAL(p->uuid));
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if (p->fstype)
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printf(" of type %s", p->fstype);
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if (p->architecture != _ARCHITECTURE_INVALID)
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printf(" for %s", architecture_to_string(p->architecture));
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k = PARTITION_VERITY_OF(i);
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if (k >= 0)
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printf(" %s verity", m->partitions[k].found ? "with" : "without");
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if (p->partno >= 0)
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printf(" on partition #%i", p->partno);
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if (p->node)
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printf(" (%s)", p->node);
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putchar('\n');
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}
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r = dissected_image_acquire_metadata(m);
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if (r < 0) {
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log_error_errno(r, "Failed to acquire image metadata: %m");
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goto finish;
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}
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if (m->hostname)
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printf(" Hostname: %s\n", m->hostname);
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if (!sd_id128_is_null(m->machine_id))
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printf("Machine ID: " SD_ID128_FORMAT_STR "\n", SD_ID128_FORMAT_VAL(m->machine_id));
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if (!strv_isempty(m->machine_info)) {
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char **p, **q;
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STRV_FOREACH_PAIR(p, q, m->machine_info)
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printf("%s %s=%s\n",
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p == m->machine_info ? "Mach. Info:" : " ",
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*p, *q);
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}
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if (!strv_isempty(m->os_release)) {
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char **p, **q;
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STRV_FOREACH_PAIR(p, q, m->os_release)
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printf("%s %s=%s\n",
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p == m->os_release ? "OS Release:" : " ",
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*p, *q);
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}
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break;
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}
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case ACTION_MOUNT:
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r = dissected_image_decrypt_interactively(m, NULL, arg_root_hash, arg_root_hash_size, arg_flags, &di);
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if (r < 0)
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goto finish;
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r = dissected_image_mount(m, arg_path, UID_INVALID, arg_flags);
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if (r < 0) {
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log_error_errno(r, "Failed to mount image: %m");
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goto finish;
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}
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if (di) {
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r = decrypted_image_relinquish(di);
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if (r < 0) {
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log_error_errno(r, "Failed to relinquish DM devices: %m");
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goto finish;
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}
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}
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loop_device_relinquish(d);
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break;
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default:
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assert_not_reached("Unknown action.");
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}
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finish:
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free(arg_root_hash);
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return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
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}
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