diff options
Diffstat (limited to 'src/dissect')
| -rw-r--r-- | src/dissect/dissect.c | 776 |
1 files changed, 776 insertions, 0 deletions
diff --git a/src/dissect/dissect.c b/src/dissect/dissect.c new file mode 100644 index 0000000..dc7e9dc --- /dev/null +++ b/src/dissect/dissect.c @@ -0,0 +1,776 @@ +/* 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 bool arg_json = false; +static JsonFormatFlags arg_json_format_flags = 0; + +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: + if (streq(optarg, "pretty")) { + arg_json = true; + arg_json_format_flags = JSON_FORMAT_PRETTY|JSON_FORMAT_COLOR_AUTO; + } else if (streq(optarg, "short")) { + arg_json = true; + arg_json_format_flags = JSON_FORMAT_NEWLINE; + } else if (streq(optarg, "off")) { + arg_json = false; + arg_json_format_flags = 0; + } else if (streq(optarg, "help")) { + puts("pretty\n" + "short\n" + "off"); + return 0; + } else + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Unknown argument to --json=: %s", optarg); + + 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) + 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) { + char s[FORMAT_BYTES_MAX]; + printf(" Size: %s\n", format_bytes(s, sizeof(s), size)); + } + + if (!arg_json) + 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) { + 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) { + _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); + } else { + r = table_print(t, stdout); + if (r < 0) + return log_error_errno(r, "Failed to dump table: %m"); + } + + 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); |