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Systemd/src/dissect/dissect.c

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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <fcntl.h>
#include <getopt.h>
#include <linux/loop.h>
#include <stdio.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
#include "architecture.h"
#include "copy.h"
#include "dissect-image.h"
#include "fd-util.h"
#include "fileio.h"
#include "format-table.h"
#include "format-util.h"
#include "fs-util.h"
#include "hexdecoct.h"
#include "log.h"
#include "loop-util.h"
#include "main-func.h"
#include "mkdir.h"
#include "mount-util.h"
#include "namespace-util.h"
#include "parse-util.h"
#include "path-util.h"
#include "pretty-print.h"
#include "stat-util.h"
#include "string-util.h"
#include "strv.h"
#include "terminal-util.h"
#include "tmpfile-util.h"
#include "user-util.h"
#include "util.h"
static enum {
ACTION_DISSECT,
ACTION_MOUNT,
ACTION_COPY_FROM,
ACTION_COPY_TO,
} arg_action = ACTION_DISSECT;
static const char *arg_image = NULL;
static const char *arg_path = NULL;
static const char *arg_source = NULL;
static const char *arg_target = NULL;
static DissectImageFlags arg_flags = DISSECT_IMAGE_REQUIRE_ROOT|DISSECT_IMAGE_DISCARD_ON_LOOP|DISSECT_IMAGE_RELAX_VAR_CHECK|DISSECT_IMAGE_FSCK;
static VeritySettings arg_verity_settings = VERITY_SETTINGS_DEFAULT;
static JsonFormatFlags arg_json_format_flags = JSON_FORMAT_OFF;
STATIC_DESTRUCTOR_REGISTER(arg_verity_settings, verity_settings_done);
static int help(void) {
_cleanup_free_ char *link = NULL;
int r;
r = terminal_urlify_man("systemd-dissect", "1", &link);
if (r < 0)
return log_oom();
printf("%1$s [OPTIONS...] IMAGE\n"
"%1$s [OPTIONS...] --mount IMAGE PATH\n"
"%1$s [OPTIONS...] --copy-from IMAGE PATH [TARGET]\n"
"%1$s [OPTIONS...] --copy-to IMAGE [SOURCE] PATH\n\n"
"%5$sDissect a file system OS image.%6$s\n\n"
"%3$sOptions:%4$s\n"
" -r --read-only Mount read-only\n"
" --fsck=BOOL Run fsck before mounting\n"
" --mkdir Make mount directory before mounting, if missing\n"
" --discard=MODE Choose 'discard' mode (disabled, loop, all, crypto)\n"
" --root-hash=HASH Specify root hash for verity\n"
" --root-hash-sig=SIG Specify pkcs7 signature of root hash for verity\n"
" as a DER encoded PKCS7, either as a path to a file\n"
" or as an ASCII base64 encoded string prefixed by\n"
" 'base64:'\n"
" --verity-data=PATH Specify data file with hash tree for verity if it is\n"
" not embedded in IMAGE\n"
" --json=pretty|short|off\n"
" Generate JSON output\n"
"\n%3$sCommands:%4$s\n"
" -h --help Show this help\n"
" --version Show package version\n"
" -m --mount Mount the image to the specified directory\n"
" -M Shortcut for --mount --mkdir\n"
" -x --copy-from Copy files from image to host\n"
" -a --copy-to Copy files from host to image\n"
"\nSee the %2$s for details.\n"
, program_invocation_short_name
, link
, ansi_underline(), ansi_normal()
, ansi_highlight(), ansi_normal());
return 0;
}
static int parse_argv(int argc, char *argv[]) {
enum {
ARG_VERSION = 0x100,
ARG_DISCARD,
ARG_FSCK,
ARG_ROOT_HASH,
ARG_ROOT_HASH_SIG,
ARG_VERITY_DATA,
ARG_MKDIR,
ARG_JSON,
};
static const struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, ARG_VERSION },
{ "mount", no_argument, NULL, 'm' },
{ "read-only", no_argument, NULL, 'r' },
{ "discard", required_argument, NULL, ARG_DISCARD },
{ "fsck", required_argument, NULL, ARG_FSCK },
{ "root-hash", required_argument, NULL, ARG_ROOT_HASH },
{ "root-hash-sig", required_argument, NULL, ARG_ROOT_HASH_SIG },
{ "verity-data", required_argument, NULL, ARG_VERITY_DATA },
{ "mkdir", no_argument, NULL, ARG_MKDIR },
{ "copy-from", no_argument, NULL, 'x' },
{ "copy-to", no_argument, NULL, 'a' },
{ "json", required_argument, NULL, ARG_JSON },
{}
};
int c, r;
assert(argc >= 0);
assert(argv);
while ((c = getopt_long(argc, argv, "hmrMxa", options, NULL)) >= 0) {
switch (c) {
case 'h':
return help();
case ARG_VERSION:
return version();
case 'm':
arg_action = ACTION_MOUNT;
break;
case ARG_MKDIR:
arg_flags |= DISSECT_IMAGE_MKDIR;
break;
case 'M':
/* Shortcut combination of the above two */
arg_action = ACTION_MOUNT;
arg_flags |= DISSECT_IMAGE_MKDIR;
break;
case 'x':
arg_action = ACTION_COPY_FROM;
arg_flags |= DISSECT_IMAGE_READ_ONLY;
break;
case 'a':
arg_action = ACTION_COPY_TO;
break;
case 'r':
arg_flags |= DISSECT_IMAGE_READ_ONLY;
break;
case ARG_DISCARD: {
DissectImageFlags flags;
if (streq(optarg, "disabled"))
flags = 0;
else if (streq(optarg, "loop"))
flags = DISSECT_IMAGE_DISCARD_ON_LOOP;
else if (streq(optarg, "all"))
flags = DISSECT_IMAGE_DISCARD_ON_LOOP | DISSECT_IMAGE_DISCARD;
else if (streq(optarg, "crypt"))
flags = DISSECT_IMAGE_DISCARD_ANY;
else if (streq(optarg, "list")) {
puts("disabled\n"
"all\n"
"crypt\n"
"loop");
return 0;
} else
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Unknown --discard= parameter: %s",
optarg);
arg_flags = (arg_flags & ~DISSECT_IMAGE_DISCARD_ANY) | flags;
break;
}
case ARG_ROOT_HASH: {
_cleanup_free_ void *p = NULL;
size_t l;
r = unhexmem(optarg, strlen(optarg), &p, &l);
if (r < 0)
return log_error_errno(r, "Failed to parse root hash '%s': %m", optarg);
if (l < sizeof(sd_id128_t))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Root hash must be at least 128bit long: %s", optarg);
free_and_replace(arg_verity_settings.root_hash, p);
arg_verity_settings.root_hash_size = l;
break;
}
case ARG_ROOT_HASH_SIG: {
char *value;
size_t l;
void *p;
if ((value = startswith(optarg, "base64:"))) {
r = unbase64mem(value, strlen(value), &p, &l);
if (r < 0)
return log_error_errno(r, "Failed to parse root hash signature '%s': %m", optarg);
} else {
r = read_full_file(optarg, (char**) &p, &l);
if (r < 0)
return log_error_errno(r, "Failed to read root hash signature file '%s': %m", optarg);
}
free_and_replace(arg_verity_settings.root_hash_sig, p);
arg_verity_settings.root_hash_sig_size = l;
break;
}
case ARG_VERITY_DATA:
r = parse_path_argument_and_warn(optarg, false, &arg_verity_settings.data_path);
if (r < 0)
return r;
break;
case ARG_FSCK:
r = parse_boolean(optarg);
if (r < 0)
return log_error_errno(r, "Failed to parse --fsck= parameter: %s", optarg);
SET_FLAG(arg_flags, DISSECT_IMAGE_FSCK, r);
break;
case ARG_JSON:
r = json_parse_cmdline_parameter_and_warn(optarg, &arg_json_format_flags);
if (r <= 0)
return r;
break;
case '?':
return -EINVAL;
default:
assert_not_reached("Unhandled option");
}
}
switch (arg_action) {
case ACTION_DISSECT:
if (optind + 1 != argc)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Expected an image file path as only argument.");
arg_image = argv[optind];
arg_flags |= DISSECT_IMAGE_READ_ONLY;
break;
case ACTION_MOUNT:
if (optind + 2 != argc)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Expected an image file path and mount point path as only arguments.");
arg_image = argv[optind];
arg_path = argv[optind + 1];
break;
case ACTION_COPY_FROM:
if (argc < optind + 2 || argc > optind + 3)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Expected an image file path, a source path and an optional destination path as only arguments.");
arg_image = argv[optind];
arg_source = argv[optind + 1];
arg_target = argc > optind + 2 ? argv[optind + 2] : "-" /* this means stdout */ ;
arg_flags |= DISSECT_IMAGE_READ_ONLY;
break;
case ACTION_COPY_TO:
if (argc < optind + 2 || argc > optind + 3)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Expected an image file path, an optional source path and a destination path as only arguments.");
arg_image = argv[optind];
if (argc > optind + 2) {
arg_source = argv[optind + 1];
arg_target = argv[optind + 2];
} else {
arg_source = "-"; /* this means stdin */
arg_target = argv[optind + 1];
}
break;
default:
assert_not_reached("Unknown action.");
}
return 1;
}
static int strv_pair_to_json(char **l, JsonVariant **ret) {
_cleanup_strv_free_ char **jl = NULL;
char **a, **b;
STRV_FOREACH_PAIR(a, b, l) {
char *j;
j = strjoin(*a, "=", *b);
if (!j)
return log_oom();
if (strv_consume(&jl, j) < 0)
return log_oom();
}
return json_variant_new_array_strv(ret, jl);
}
static int action_dissect(DissectedImage *m, LoopDevice *d) {
_cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
_cleanup_(table_unrefp) Table *t = NULL;
uint64_t size = UINT64_MAX;
int r;
assert(m);
assert(d);
if (arg_json_format_flags & JSON_FORMAT_OFF)
printf(" Name: %s\n", basename(arg_image));
if (ioctl(d->fd, BLKGETSIZE64, &size) < 0)
log_debug_errno(errno, "Failed to query size of loopback device: %m");
else if (arg_json_format_flags & JSON_FORMAT_OFF) {
char s[FORMAT_BYTES_MAX];
printf(" Size: %s\n", format_bytes(s, sizeof(s), size));
}
if (arg_json_format_flags & JSON_FORMAT_OFF)
putc('\n', stdout);
r = dissected_image_acquire_metadata(m);
if (r == -ENXIO)
return log_error_errno(r, "No root partition discovered.");
if (r == -EUCLEAN)
return log_error_errno(r, "File system check of image failed.");
if (r == -EMEDIUMTYPE)
log_warning_errno(r, "Not a valid OS image, no os-release file included. Proceeding anyway.");
else if (r == -EUNATCH)
log_warning_errno(r, "OS image is encrypted, proceeding without showing OS image metadata.");
else if (r == -EBUSY)
log_warning_errno(r, "OS image is currently in use, proceeding without showing OS image metadata.");
else if (r < 0)
return log_error_errno(r, "Failed to acquire image metadata: %m");
else if (arg_json_format_flags & JSON_FORMAT_OFF) {
if (m->hostname)
printf(" Hostname: %s\n", m->hostname);
if (!sd_id128_is_null(m->machine_id))
printf("Machine ID: " SD_ID128_FORMAT_STR "\n", SD_ID128_FORMAT_VAL(m->machine_id));
if (!strv_isempty(m->machine_info)) {
char **p, **q;
STRV_FOREACH_PAIR(p, q, m->machine_info)
printf("%s %s=%s\n",
p == m->machine_info ? "Mach. Info:" : " ",
*p, *q);
}
if (!strv_isempty(m->os_release)) {
char **p, **q;
STRV_FOREACH_PAIR(p, q, m->os_release)
printf("%s %s=%s\n",
p == m->os_release ? "OS Release:" : " ",
*p, *q);
}
if (m->hostname ||
!sd_id128_is_null(m->machine_id) ||
!strv_isempty(m->machine_info) ||
!strv_isempty(m->os_release))
putc('\n', stdout);
} else {
_cleanup_(json_variant_unrefp) JsonVariant *mi = NULL, *osr = NULL;
if (!strv_isempty(m->machine_info)) {
r = strv_pair_to_json(m->machine_info, &mi);
if (r < 0)
return log_oom();
}
if (!strv_isempty(m->os_release)) {
r = strv_pair_to_json(m->os_release, &osr);
if (r < 0)
return log_oom();
}
r = json_build(&v, JSON_BUILD_OBJECT(
JSON_BUILD_PAIR("name", JSON_BUILD_STRING(basename(arg_image))),
JSON_BUILD_PAIR("size", JSON_BUILD_INTEGER(size)),
JSON_BUILD_PAIR_CONDITION(m->hostname, "hostname", JSON_BUILD_STRING(m->hostname)),
JSON_BUILD_PAIR_CONDITION(!sd_id128_is_null(m->machine_id), "machineId", JSON_BUILD_ID128(m->machine_id)),
JSON_BUILD_PAIR_CONDITION(mi, "machineInfo", JSON_BUILD_VARIANT(mi)),
JSON_BUILD_PAIR_CONDITION(osr, "osRelease", JSON_BUILD_VARIANT(osr))));
if (r < 0)
return log_oom();
}
t = table_new("rw", "designator", "partition uuid", "fstype", "architecture", "verity", "node", "partno");
if (!t)
return log_oom();
(void) table_set_empty_string(t, "-");
(void) table_set_align_percent(t, table_get_cell(t, 0, 7), 100);
for (PartitionDesignator i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) {
DissectedPartition *p = m->partitions + i;
if (!p->found)
continue;
r = table_add_many(
t,
TABLE_STRING, p->rw ? "rw" : "ro",
TABLE_STRING, partition_designator_to_string(i));
if (r < 0)
return table_log_add_error(r);
if (sd_id128_is_null(p->uuid))
r = table_add_cell(t, NULL, TABLE_EMPTY, NULL);
else
r = table_add_cell(t, NULL, TABLE_UUID, &p->uuid);
if (r < 0)
return table_log_add_error(r);
r = table_add_many(
t,
TABLE_STRING, p->fstype,
TABLE_STRING, architecture_to_string(p->architecture));
if (r < 0)
return table_log_add_error(r);
if (arg_verity_settings.data_path)
r = table_add_cell(t, NULL, TABLE_STRING, "external");
else if (dissected_image_can_do_verity(m, i))
r = table_add_cell(t, NULL, TABLE_STRING, yes_no(dissected_image_has_verity(m, i)));
else
r = table_add_cell(t, NULL, TABLE_EMPTY, NULL);
if (r < 0)
return table_log_add_error(r);
if (p->partno < 0) /* no partition table, naked file system */ {
r = table_add_cell(t, NULL, TABLE_STRING, arg_image);
if (r < 0)
return table_log_add_error(r);
r = table_add_cell(t, NULL, TABLE_EMPTY, NULL);
} else {
r = table_add_cell(t, NULL, TABLE_STRING, p->node);
if (r < 0)
return table_log_add_error(r);
r = table_add_cell(t, NULL, TABLE_INT, &p->partno);
}
if (r < 0)
return table_log_add_error(r);
}
if (arg_json_format_flags & JSON_FORMAT_OFF) {
r = table_print(t, stdout);
if (r < 0)
return table_log_print_error(r);
} else {
_cleanup_(json_variant_unrefp) JsonVariant *jt = NULL;
r = table_to_json(t, &jt);
if (r < 0)
return log_error_errno(r, "Failed to convert table to JSON: %m");
r = json_variant_set_field(&v, "mounts", jt);
if (r < 0)
return log_oom();
json_variant_dump(v, arg_json_format_flags, stdout, NULL);
}
return 0;
}
static int action_mount(DissectedImage *m, LoopDevice *d) {
_cleanup_(decrypted_image_unrefp) DecryptedImage *di = NULL;
int r;
assert(m);
assert(d);
r = dissected_image_decrypt_interactively(
m, NULL,
&arg_verity_settings,
arg_flags,
&di);
if (r < 0)
return r;
r = dissected_image_mount_and_warn(m, arg_path, UID_INVALID, arg_flags);
if (r < 0)
return r;
if (di) {
r = decrypted_image_relinquish(di);
if (r < 0)
return log_error_errno(r, "Failed to relinquish DM devices: %m");
}
loop_device_relinquish(d);
return 0;
}
static int action_copy(DissectedImage *m, LoopDevice *d) {
_cleanup_(umount_and_rmdir_and_freep) char *mounted_dir = NULL;
_cleanup_(decrypted_image_unrefp) DecryptedImage *di = NULL;
_cleanup_(rmdir_and_freep) char *created_dir = NULL;
_cleanup_free_ char *temp = NULL;
int r;
assert(m);
assert(d);
r = dissected_image_decrypt_interactively(
m, NULL,
&arg_verity_settings,
arg_flags,
&di);
if (r < 0)
return r;
r = detach_mount_namespace();
if (r < 0)
return log_error_errno(r, "Failed to detach mount namespace: %m");
r = tempfn_random_child(NULL, program_invocation_short_name, &temp);
if (r < 0)
return log_error_errno(r, "Failed to generate temporary mount directory: %m");
r = mkdir_p(temp, 0700);
if (r < 0)
return log_error_errno(r, "Failed to create mount point: %m");
created_dir = TAKE_PTR(temp);
r = dissected_image_mount_and_warn(m, created_dir, UID_INVALID, arg_flags);
if (r < 0)
return r;
mounted_dir = TAKE_PTR(created_dir);
if (di) {
r = decrypted_image_relinquish(di);
if (r < 0)
return log_error_errno(r, "Failed to relinquish DM devices: %m");
}
loop_device_relinquish(d);
if (arg_action == ACTION_COPY_FROM) {
_cleanup_close_ int source_fd = -1, target_fd = -1;
source_fd = chase_symlinks_and_open(arg_source, mounted_dir, CHASE_PREFIX_ROOT|CHASE_WARN, O_RDONLY|O_CLOEXEC|O_NOCTTY, NULL);
if (source_fd < 0)
return log_error_errno(source_fd, "Failed to open source path '%s' in image '%s': %m", arg_source, arg_image);
/* Copying to stdout? */
if (streq(arg_target, "-")) {
r = copy_bytes(source_fd, STDOUT_FILENO, (uint64_t) -1, COPY_REFLINK);
if (r < 0)
return log_error_errno(r, "Failed to copy bytes from %s in mage '%s' to stdout: %m", arg_source, arg_image);
/* When we copy to stdou we don't copy any attributes (i.e. no access mode, no ownership, no xattr, no times) */
return 0;
}
/* Try to copy as directory? */
r = copy_directory_fd(source_fd, arg_target, COPY_REFLINK|COPY_MERGE_EMPTY|COPY_SIGINT|COPY_HARDLINKS);
if (r >= 0)
return 0;
if (r != -ENOTDIR)
return log_error_errno(r, "Failed to copy %s in image '%s' to '%s': %m", arg_source, arg_image, arg_target);
r = fd_verify_regular(source_fd);
if (r == -EISDIR)
return log_error_errno(r, "Target '%s' exists already and is not a directory.", arg_target);
if (r < 0)
return log_error_errno(r, "Source path %s in image '%s' is neither regular file nor directory, refusing: %m", arg_source, arg_image);
/* Nah, it's a plain file! */
target_fd = open(arg_target, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, 0600);
if (target_fd < 0)
return log_error_errno(errno, "Failed to create regular file at target path '%s': %m", arg_target);
r = copy_bytes(source_fd, target_fd, (uint64_t) -1, COPY_REFLINK);
if (r < 0)
return log_error_errno(r, "Failed to copy bytes from %s in mage '%s' to '%s': %m", arg_source, arg_image, arg_target);
(void) copy_xattr(source_fd, target_fd);
(void) copy_access(source_fd, target_fd);
(void) copy_times(source_fd, target_fd, 0);
/* When this is a regular file we don't copy ownership! */
} else {
_cleanup_close_ int source_fd = -1, target_fd = -1;
_cleanup_close_ int dfd = -1;
_cleanup_free_ char *dn = NULL;
assert(arg_action == ACTION_COPY_TO);
dn = dirname_malloc(arg_target);
if (!dn)
return log_oom();
r = chase_symlinks(dn, mounted_dir, CHASE_PREFIX_ROOT|CHASE_WARN, NULL, &dfd);
if (r < 0)
return log_error_errno(r, "Failed to open '%s': %m", dn);
/* Are we reading from stdin? */
if (streq(arg_source, "-")) {
target_fd = openat(dfd, basename(arg_target), O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY|O_EXCL, 0644);
if (target_fd < 0)
return log_error_errno(errno, "Failed to open target file '%s': %m", arg_target);
r = copy_bytes(STDIN_FILENO, target_fd, (uint64_t) -1, COPY_REFLINK);
if (r < 0)
return log_error_errno(r, "Failed to copy bytes from stdin to '%s' in image '%s': %m", arg_target, arg_image);
/* When we copy from stdin we don't copy any attributes (i.e. no access mode, no ownership, no xattr, no times) */
return 0;
}
source_fd = open(arg_source, O_RDONLY|O_CLOEXEC|O_NOCTTY);
if (source_fd < 0)
return log_error_errno(source_fd, "Failed to open source path '%s': %m", arg_source);
r = fd_verify_regular(source_fd);
if (r < 0) {
if (r != -EISDIR)
return log_error_errno(r, "Source '%s' is neither regular file nor directory: %m", arg_source);
/* We are looking at a directory. */
target_fd = openat(dfd, basename(arg_target), O_RDONLY|O_DIRECTORY|O_CLOEXEC);
if (target_fd < 0) {
if (errno != ENOENT)
return log_error_errno(errno, "Failed to open destination '%s': %m", arg_target);
r = copy_tree_at(source_fd, ".", dfd, basename(arg_target), UID_INVALID, GID_INVALID, COPY_REFLINK|COPY_REPLACE|COPY_SIGINT|COPY_HARDLINKS);
} else
r = copy_tree_at(source_fd, ".", target_fd, ".", UID_INVALID, GID_INVALID, COPY_REFLINK|COPY_REPLACE|COPY_SIGINT|COPY_HARDLINKS);
if (r < 0)
return log_error_errno(r, "Failed to copy '%s' to '%s' in image '%s': %m", arg_source, arg_target, arg_image);
return 0;
}
/* We area looking at a regular file */
target_fd = openat(dfd, basename(arg_target), O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY|O_EXCL, 0600);
if (target_fd < 0)
return log_error_errno(errno, "Failed to open target file '%s': %m", arg_target);
r = copy_bytes(source_fd, target_fd, (uint64_t) -1, COPY_REFLINK);
if (r < 0)
return log_error_errno(r, "Failed to copy bytes from '%s' to '%s' in image '%s': %m", arg_source, arg_target, arg_image);
(void) copy_xattr(source_fd, target_fd);
(void) copy_access(source_fd, target_fd);
(void) copy_times(source_fd, target_fd, 0);
/* When this is a regular file we don't copy ownership! */
}
return 0;
}
static int run(int argc, char *argv[]) {
_cleanup_(dissected_image_unrefp) DissectedImage *m = NULL;
_cleanup_(loop_device_unrefp) LoopDevice *d = NULL;
int r;
log_parse_environment();
log_open();
r = parse_argv(argc, argv);
if (r <= 0)
return r;
r = verity_settings_load(
&arg_verity_settings,
arg_image, NULL, NULL);
if (r < 0)
return log_error_errno(r, "Failed to read verity artifacts for %s: %m", arg_image);
if (arg_verity_settings.data_path)
arg_flags |= DISSECT_IMAGE_NO_PARTITION_TABLE; /* We only support Verity per file system,
* hence if there's external Verity data
* available we turn off partition table
* support */
r = loop_device_make_by_path(
arg_image,
FLAGS_SET(arg_flags, DISSECT_IMAGE_READ_ONLY) ? O_RDONLY : O_RDWR,
FLAGS_SET(arg_flags, DISSECT_IMAGE_NO_PARTITION_TABLE) ? 0 : LO_FLAGS_PARTSCAN,
&d);
if (r < 0)
return log_error_errno(r, "Failed to set up loopback device: %m");
r = dissect_image_and_warn(
d->fd,
arg_image,
&arg_verity_settings,
NULL,
arg_flags,
&m);
if (r < 0)
return r;
switch (arg_action) {
case ACTION_DISSECT:
r = action_dissect(m, d);
break;
case ACTION_MOUNT:
r = action_mount(m, d);
break;
case ACTION_COPY_FROM:
case ACTION_COPY_TO:
r = action_copy(m, d);
break;
default:
assert_not_reached("Unknown action.");
}
return r;
}
DEFINE_MAIN_FUNCTION(run);
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