/* SPDX-License-Identifier: LGPL-2.1-or-later */ #include #include "bus-common-errors.h" #include "bus-error.h" #include "bus-locator.h" #include "chase.h" #include "conf-files.h" #include "copy.h" #include "data-fd-util.h" #include "constants.h" #include "dirent-util.h" #include "discover-image.h" #include "dissect-image.h" #include "env-file.h" #include "env-util.h" #include "errno-list.h" #include "escape.h" #include "extension-util.h" #include "fd-util.h" #include "fileio.h" #include "fs-util.h" #include "install.h" #include "io-util.h" #include "locale-util.h" #include "loop-util.h" #include "mkdir.h" #include "nulstr-util.h" #include "os-util.h" #include "path-lookup.h" #include "portable.h" #include "process-util.h" #include "selinux-util.h" #include "set.h" #include "signal-util.h" #include "socket-util.h" #include "sort-util.h" #include "string-table.h" #include "strv.h" #include "tmpfile-util.h" #include "user-util.h" /* Markers used in the first line of our 20-portable.conf unit file drop-in to determine, that a) the unit file was * dropped there by the portable service logic and b) for which image it was dropped there. */ #define PORTABLE_DROPIN_MARKER_BEGIN "# Drop-in created for image '" #define PORTABLE_DROPIN_MARKER_END "', do not edit." static bool prefix_match(const char *unit, const char *prefix) { const char *p; p = startswith(unit, prefix); if (!p) return false; /* Only respect prefixes followed by dash or dot or when there's a complete match */ return IN_SET(*p, '-', '.', '@', 0); } static bool unit_match(const char *unit, char **matches) { const char *dot; dot = strrchr(unit, '.'); if (!dot) return false; if (!STR_IN_SET(dot, ".service", ".socket", ".target", ".timer", ".path")) return false; /* Empty match expression means: everything */ if (strv_isempty(matches)) return true; /* Otherwise, at least one needs to match */ STRV_FOREACH(i, matches) if (prefix_match(unit, *i)) return true; return false; } static PortableMetadata *portable_metadata_new(const char *name, const char *path, const char *selinux_label, int fd) { PortableMetadata *m; m = malloc0(offsetof(PortableMetadata, name) + strlen(name) + 1); if (!m) return NULL; /* In case of a layered attach, we want to remember which image the unit came from */ if (path) { m->image_path = strdup(path); if (!m->image_path) return mfree(m); } /* The metadata file might have SELinux labels, we need to carry them and reapply them */ if (!isempty(selinux_label)) { m->selinux_label = strdup(selinux_label); if (!m->selinux_label) { free(m->image_path); return mfree(m); } } strcpy(m->name, name); m->fd = fd; return TAKE_PTR(m); } PortableMetadata *portable_metadata_unref(PortableMetadata *i) { if (!i) return NULL; safe_close(i->fd); free(i->source); free(i->image_path); free(i->selinux_label); return mfree(i); } static int compare_metadata(PortableMetadata *const *x, PortableMetadata *const *y) { return strcmp((*x)->name, (*y)->name); } int portable_metadata_hashmap_to_sorted_array(Hashmap *unit_files, PortableMetadata ***ret) { _cleanup_free_ PortableMetadata **sorted = NULL; PortableMetadata *item; size_t k = 0; sorted = new(PortableMetadata*, hashmap_size(unit_files)); if (!sorted) return -ENOMEM; HASHMAP_FOREACH(item, unit_files) sorted[k++] = item; assert(k == hashmap_size(unit_files)); typesafe_qsort(sorted, k, compare_metadata); *ret = TAKE_PTR(sorted); return 0; } static int send_one_fd_iov_with_data_fd( int socket_fd, const struct iovec *iov, size_t iovlen, int fd) { _cleanup_close_ int data_fd = -EBADF; assert(iov || iovlen == 0); assert(socket_fd >= 0); assert(fd >= 0); data_fd = copy_data_fd(fd); if (data_fd < 0) return data_fd; return send_one_fd_iov(socket_fd, data_fd, iov, iovlen, 0); } DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(portable_metadata_hash_ops, char, string_hash_func, string_compare_func, PortableMetadata, portable_metadata_unref); static int extract_now( const char *where, char **matches, const char *image_name, bool path_is_extension, bool relax_extension_release_check, int socket_fd, PortableMetadata **ret_os_release, Hashmap **ret_unit_files) { _cleanup_hashmap_free_ Hashmap *unit_files = NULL; _cleanup_(portable_metadata_unrefp) PortableMetadata *os_release = NULL; _cleanup_(lookup_paths_free) LookupPaths paths = {}; _cleanup_close_ int os_release_fd = -EBADF; _cleanup_free_ char *os_release_path = NULL; const char *os_release_id; int r; /* Extracts the metadata from a directory tree 'where'. Extracts two kinds of information: the /etc/os-release * data, and all unit files matching the specified expression. Note that this function is called in two very * different but also similar contexts. When the tool gets invoked on a directory tree, we'll process it * directly, and in-process, and thus can return the requested data directly, via 'ret_os_release' and * 'ret_unit_files'. However, if the tool is invoked on a raw disk image — which needs to be mounted first — we * are invoked in a child process with private mounts and then need to send the collected data to our * parent. To handle both cases in one call this function also gets a 'socket_fd' parameter, which when >= 0 is * used to send the data to the parent. */ assert(where); /* First, find os-release/extension-release and send it upstream (or just save it). */ if (path_is_extension) { os_release_id = strjoina("/usr/lib/extension-release.d/extension-release.", image_name); r = open_extension_release(where, IMAGE_SYSEXT, image_name, relax_extension_release_check, &os_release_path, &os_release_fd); } else { os_release_id = "/etc/os-release"; r = open_os_release(where, &os_release_path, &os_release_fd); } if (r < 0) log_debug_errno(r, "Couldn't acquire %s file, ignoring: %m", path_is_extension ? "extension-release " : "os-release"); else { if (socket_fd >= 0) { struct iovec iov[] = { IOVEC_MAKE_STRING(os_release_id), IOVEC_MAKE((char *)"\0", sizeof(char)), }; r = send_one_fd_iov_with_data_fd(socket_fd, iov, ELEMENTSOF(iov), os_release_fd); if (r < 0) return log_debug_errno(r, "Failed to send os-release file: %m"); } if (ret_os_release) { os_release = portable_metadata_new(os_release_id, NULL, NULL, os_release_fd); if (!os_release) return -ENOMEM; os_release_fd = -EBADF; os_release->source = TAKE_PTR(os_release_path); } } /* Then, send unit file data to the parent (or/and add it to the hashmap). For that we use our usual unit * discovery logic. Note that we force looking inside of /lib/systemd/system/ for units too, as the * image might have a legacy split-usr layout. */ r = lookup_paths_init(&paths, RUNTIME_SCOPE_SYSTEM, LOOKUP_PATHS_SPLIT_USR, where); if (r < 0) return log_debug_errno(r, "Failed to acquire lookup paths: %m"); unit_files = hashmap_new(&portable_metadata_hash_ops); if (!unit_files) return -ENOMEM; STRV_FOREACH(i, paths.search_path) { _cleanup_free_ char *resolved = NULL; _cleanup_closedir_ DIR *d = NULL; r = chase_and_opendir(*i, where, 0, &resolved, &d); if (r < 0) { log_debug_errno(r, "Failed to open unit path '%s', ignoring: %m", *i); continue; } FOREACH_DIRENT(de, d, return log_debug_errno(errno, "Failed to read directory: %m")) { _cleanup_(portable_metadata_unrefp) PortableMetadata *m = NULL; _cleanup_(mac_selinux_freep) char *con = NULL; _cleanup_close_ int fd = -EBADF; struct stat st; if (!unit_name_is_valid(de->d_name, UNIT_NAME_ANY)) continue; if (!unit_match(de->d_name, matches)) continue; /* Filter out duplicates */ if (hashmap_get(unit_files, de->d_name)) continue; if (!IN_SET(de->d_type, DT_LNK, DT_REG)) continue; fd = openat(dirfd(d), de->d_name, O_CLOEXEC|O_RDONLY); if (fd < 0) { log_debug_errno(errno, "Failed to open unit file '%s', ignoring: %m", de->d_name); continue; } /* Reject empty files, just in case */ if (fstat(fd, &st) < 0) { log_debug_errno(errno, "Failed to stat unit file '%s', ignoring: %m", de->d_name); continue; } if (st.st_size <= 0) { log_debug("Unit file '%s' is empty, ignoring.", de->d_name); continue; } #if HAVE_SELINUX /* The units will be copied on the host's filesystem, so if they had a SELinux label * we have to preserve it. Copy it out so that it can be applied later. */ r = fgetfilecon_raw(fd, &con); if (r < 0 && !ERRNO_IS_XATTR_ABSENT(errno)) log_debug_errno(errno, "Failed to get SELinux file context from '%s', ignoring: %m", de->d_name); #endif if (socket_fd >= 0) { struct iovec iov[] = { IOVEC_MAKE_STRING(de->d_name), IOVEC_MAKE((char *)"\0", sizeof(char)), IOVEC_MAKE_STRING(strempty(con)), }; r = send_one_fd_iov_with_data_fd(socket_fd, iov, ELEMENTSOF(iov), fd); if (r < 0) return log_debug_errno(r, "Failed to send unit metadata to parent: %m"); } m = portable_metadata_new(de->d_name, where, con, fd); if (!m) return -ENOMEM; fd = -EBADF; m->source = path_join(resolved, de->d_name); if (!m->source) return -ENOMEM; r = hashmap_put(unit_files, m->name, m); if (r < 0) return log_debug_errno(r, "Failed to add unit to hashmap: %m"); m = NULL; } } if (ret_os_release) *ret_os_release = TAKE_PTR(os_release); if (ret_unit_files) *ret_unit_files = TAKE_PTR(unit_files); return 0; } static int portable_extract_by_path( const char *path, bool path_is_extension, bool relax_extension_release_check, char **matches, const ImagePolicy *image_policy, PortableMetadata **ret_os_release, Hashmap **ret_unit_files, sd_bus_error *error) { _cleanup_hashmap_free_ Hashmap *unit_files = NULL; _cleanup_(portable_metadata_unrefp) PortableMetadata* os_release = NULL; _cleanup_(loop_device_unrefp) LoopDevice *d = NULL; int r; assert(path); r = loop_device_make_by_path(path, O_RDONLY, /* sector_size= */ UINT32_MAX, LO_FLAGS_PARTSCAN, LOCK_SH, &d); if (r == -EISDIR) { _cleanup_free_ char *image_name = NULL; /* We can't turn this into a loop-back block device, and this returns EISDIR? Then this is a directory * tree and not a raw device. It's easy then. */ r = path_extract_filename(path, &image_name); if (r < 0) return log_error_errno(r, "Failed to extract image name from path '%s': %m", path); r = extract_now(path, matches, image_name, path_is_extension, /* relax_extension_release_check= */ false, -1, &os_release, &unit_files); if (r < 0) return r; } else if (r < 0) return log_debug_errno(r, "Failed to set up loopback device for %s: %m", path); else { _cleanup_(dissected_image_unrefp) DissectedImage *m = NULL; _cleanup_(rmdir_and_freep) char *tmpdir = NULL; _cleanup_close_pair_ int seq[2] = PIPE_EBADF; _cleanup_(sigkill_waitp) pid_t child = 0; /* We now have a loopback block device, let's fork off a child in its own mount namespace, mount it * there, and extract the metadata we need. The metadata is sent from the child back to us. */ BLOCK_SIGNALS(SIGCHLD); r = mkdtemp_malloc("/tmp/inspect-XXXXXX", &tmpdir); if (r < 0) return log_debug_errno(r, "Failed to create temporary directory: %m"); r = dissect_loop_device( d, /* verity= */ NULL, /* mount_options= */ NULL, image_policy, DISSECT_IMAGE_READ_ONLY | DISSECT_IMAGE_GENERIC_ROOT | DISSECT_IMAGE_REQUIRE_ROOT | DISSECT_IMAGE_DISCARD_ON_LOOP | DISSECT_IMAGE_RELAX_VAR_CHECK | DISSECT_IMAGE_USR_NO_ROOT | DISSECT_IMAGE_ADD_PARTITION_DEVICES | DISSECT_IMAGE_PIN_PARTITION_DEVICES, &m); if (r == -ENOPKG) sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Couldn't identify a suitable partition table or file system in '%s'.", path); else if (r == -EADDRNOTAVAIL) sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "No root partition for specified root hash found in '%s'.", path); else if (r == -ENOTUNIQ) sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Multiple suitable root partitions found in image '%s'.", path); else if (r == -ENXIO) sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "No suitable root partition found in image '%s'.", path); else if (r == -EPROTONOSUPPORT) sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Device '%s' is loopback block device with partition scanning turned off, please turn it on.", path); if (r < 0) return r; if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, seq) < 0) return log_debug_errno(errno, "Failed to allocated SOCK_SEQPACKET socket: %m"); r = safe_fork("(sd-dissect)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_NEW_MOUNTNS|FORK_MOUNTNS_SLAVE|FORK_LOG, &child); if (r < 0) return r; if (r == 0) { DissectImageFlags flags = DISSECT_IMAGE_READ_ONLY; seq[0] = safe_close(seq[0]); if (path_is_extension) flags |= DISSECT_IMAGE_VALIDATE_OS_EXT | (relax_extension_release_check ? DISSECT_IMAGE_RELAX_EXTENSION_CHECK : 0); else flags |= DISSECT_IMAGE_VALIDATE_OS; r = dissected_image_mount(m, tmpdir, UID_INVALID, UID_INVALID, flags); if (r < 0) { log_debug_errno(r, "Failed to mount dissected image: %m"); goto child_finish; } r = extract_now(tmpdir, matches, m->image_name, path_is_extension, relax_extension_release_check, seq[1], NULL, NULL); child_finish: _exit(r < 0 ? EXIT_FAILURE : EXIT_SUCCESS); } seq[1] = safe_close(seq[1]); unit_files = hashmap_new(&portable_metadata_hash_ops); if (!unit_files) return -ENOMEM; for (;;) { _cleanup_(portable_metadata_unrefp) PortableMetadata *add = NULL; _cleanup_close_ int fd = -EBADF; /* We use NAME_MAX space for the SELinux label here. The kernel currently enforces no limit, but * according to suggestions from the SELinux people this will change and it will probably be * identical to NAME_MAX. For now we use that, but this should be updated one day when the final * limit is known. */ char iov_buffer[PATH_MAX + NAME_MAX + 2]; struct iovec iov = IOVEC_MAKE(iov_buffer, sizeof(iov_buffer)); ssize_t n = receive_one_fd_iov(seq[0], &iov, 1, 0, &fd); if (n == -EIO) break; if (n < 0) return log_debug_errno(n, "Failed to receive item: %m"); iov_buffer[n] = 0; /* We can't really distinguish a zero-length datagram without any fds from EOF (both are signalled the * same way by recvmsg()). Hence, accept either as end notification. */ if (isempty(iov_buffer) && fd < 0) break; if (isempty(iov_buffer) || fd < 0) return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "Invalid item sent from child."); /* Given recvmsg cannot be used with multiple io vectors if you don't know the size in advance, * use a marker to separate the name and the optional SELinux context. */ char *selinux_label = memchr(iov_buffer, 0, n); assert(selinux_label); selinux_label++; add = portable_metadata_new(iov_buffer, path, selinux_label, fd); if (!add) return -ENOMEM; fd = -EBADF; /* Note that we do not initialize 'add->source' here, as the source path is not usable here as * it refers to a path only valid in the short-living namespaced child process we forked * here. */ if (PORTABLE_METADATA_IS_UNIT(add)) { r = hashmap_put(unit_files, add->name, add); if (r < 0) return log_debug_errno(r, "Failed to add item to unit file list: %m"); add = NULL; } else if (PORTABLE_METADATA_IS_OS_RELEASE(add) || PORTABLE_METADATA_IS_EXTENSION_RELEASE(add)) { assert(!os_release); os_release = TAKE_PTR(add); } else assert_not_reached(); } r = wait_for_terminate_and_check("(sd-dissect)", child, 0); if (r < 0) return r; child = 0; } if (!os_release) return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Image '%s' lacks %s data, refusing.", path, path_is_extension ? "extension-release" : "os-release"); if (ret_unit_files) *ret_unit_files = TAKE_PTR(unit_files); if (ret_os_release) *ret_os_release = TAKE_PTR(os_release); return 0; } static int extract_image_and_extensions( const char *name_or_path, char **matches, char **extension_image_paths, bool validate_sysext, bool relax_extension_release_check, const ImagePolicy *image_policy, Image **ret_image, OrderedHashmap **ret_extension_images, OrderedHashmap **ret_extension_releases, PortableMetadata **ret_os_release, Hashmap **ret_unit_files, char ***ret_valid_prefixes, sd_bus_error *error) { _cleanup_free_ char *id = NULL, *version_id = NULL, *sysext_level = NULL; _cleanup_(portable_metadata_unrefp) PortableMetadata *os_release = NULL; _cleanup_ordered_hashmap_free_ OrderedHashmap *extension_images = NULL, *extension_releases = NULL; _cleanup_hashmap_free_ Hashmap *unit_files = NULL; _cleanup_strv_free_ char **valid_prefixes = NULL; _cleanup_(image_unrefp) Image *image = NULL; Image *ext; int r; assert(name_or_path); r = image_find_harder(IMAGE_PORTABLE, name_or_path, NULL, &image); if (r < 0) return r; if (!strv_isempty(extension_image_paths)) { extension_images = ordered_hashmap_new(&image_hash_ops); if (!extension_images) return -ENOMEM; if (ret_extension_releases) { extension_releases = ordered_hashmap_new(&portable_metadata_hash_ops); if (!extension_releases) return -ENOMEM; } STRV_FOREACH(p, extension_image_paths) { _cleanup_(image_unrefp) Image *new = NULL; r = image_find_harder(IMAGE_PORTABLE, *p, NULL, &new); if (r < 0) return r; r = ordered_hashmap_put(extension_images, new->name, new); if (r < 0) return r; TAKE_PTR(new); } } r = portable_extract_by_path( image->path, /* path_is_extension= */ false, /* relax_extension_release_check= */ false, matches, image_policy, &os_release, &unit_files, error); if (r < 0) return r; /* If we are layering extension images on top of a runtime image, check that the os-release and * extension-release metadata match, otherwise reject it immediately as invalid, or it will fail when * the units are started. Also, collect valid portable prefixes if caller requested that. */ if (validate_sysext || ret_valid_prefixes) { _cleanup_free_ char *prefixes = NULL; r = parse_env_file_fd(os_release->fd, os_release->name, "ID", &id, "VERSION_ID", &version_id, "SYSEXT_LEVEL", &sysext_level, "PORTABLE_PREFIXES", &prefixes); if (r < 0) return r; if (isempty(id)) return sd_bus_error_set_errnof(error, SYNTHETIC_ERRNO(ESTALE), "Image %s os-release metadata lacks the ID field", name_or_path); if (prefixes) { valid_prefixes = strv_split(prefixes, WHITESPACE); if (!valid_prefixes) return -ENOMEM; } } ORDERED_HASHMAP_FOREACH(ext, extension_images) { _cleanup_(portable_metadata_unrefp) PortableMetadata *extension_release_meta = NULL; _cleanup_hashmap_free_ Hashmap *extra_unit_files = NULL; _cleanup_strv_free_ char **extension_release = NULL; const char *e; r = portable_extract_by_path( ext->path, /* path_is_extension= */ true, relax_extension_release_check, matches, image_policy, &extension_release_meta, &extra_unit_files, error); if (r < 0) return r; r = hashmap_move(unit_files, extra_unit_files); if (r < 0) return r; if (!validate_sysext && !ret_valid_prefixes && !ret_extension_releases) continue; r = load_env_file_pairs_fd(extension_release_meta->fd, extension_release_meta->name, &extension_release); if (r < 0) return r; if (validate_sysext) { r = extension_release_validate(ext->path, id, version_id, sysext_level, "portable", extension_release, IMAGE_SYSEXT); if (r == 0) return sd_bus_error_set_errnof(error, SYNTHETIC_ERRNO(ESTALE), "Image %s extension-release metadata does not match the root's", ext->path); if (r < 0) return sd_bus_error_set_errnof(error, r, "Failed to compare image %s extension-release metadata with the root's os-release: %m", ext->path); } e = strv_env_pairs_get(extension_release, "PORTABLE_PREFIXES"); if (e) { _cleanup_strv_free_ char **l = NULL; l = strv_split(e, WHITESPACE); if (!l) return -ENOMEM; r = strv_extend_strv(&valid_prefixes, l, true); if (r < 0) return r; } if (ret_extension_releases) { r = ordered_hashmap_put(extension_releases, ext->name, extension_release_meta); if (r < 0) return r; TAKE_PTR(extension_release_meta); } } strv_sort(valid_prefixes); if (ret_image) *ret_image = TAKE_PTR(image); if (ret_extension_images) *ret_extension_images = TAKE_PTR(extension_images); if (ret_extension_releases) *ret_extension_releases = TAKE_PTR(extension_releases); if (ret_os_release) *ret_os_release = TAKE_PTR(os_release); if (ret_unit_files) *ret_unit_files = TAKE_PTR(unit_files); if (ret_valid_prefixes) *ret_valid_prefixes = TAKE_PTR(valid_prefixes); return 0; } int portable_extract( const char *name_or_path, char **matches, char **extension_image_paths, const ImagePolicy *image_policy, PortableFlags flags, PortableMetadata **ret_os_release, OrderedHashmap **ret_extension_releases, Hashmap **ret_unit_files, char ***ret_valid_prefixes, sd_bus_error *error) { _cleanup_(portable_metadata_unrefp) PortableMetadata *os_release = NULL; _cleanup_ordered_hashmap_free_ OrderedHashmap *extension_images = NULL, *extension_releases = NULL; _cleanup_hashmap_free_ Hashmap *unit_files = NULL; _cleanup_strv_free_ char **valid_prefixes = NULL; _cleanup_(image_unrefp) Image *image = NULL; int r; assert(name_or_path); r = extract_image_and_extensions( name_or_path, matches, extension_image_paths, /* validate_sysext= */ false, /* relax_extension_release_check= */ FLAGS_SET(flags, PORTABLE_FORCE_SYSEXT), image_policy, &image, &extension_images, &extension_releases, &os_release, &unit_files, ret_valid_prefixes ? &valid_prefixes : NULL, error); if (r < 0) return r; if (hashmap_isempty(unit_files)) { _cleanup_free_ char *extensions = strv_join(extension_image_paths, ", "); if (!extensions) return -ENOMEM; return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Couldn't find any matching unit files in image '%s%s%s', refusing.", image->path, isempty(extensions) ? "" : "' or any of its extensions '", isempty(extensions) ? "" : extensions); } if (ret_os_release) *ret_os_release = TAKE_PTR(os_release); if (ret_extension_releases) *ret_extension_releases = TAKE_PTR(extension_releases); if (ret_unit_files) *ret_unit_files = TAKE_PTR(unit_files); if (ret_valid_prefixes) *ret_valid_prefixes = TAKE_PTR(valid_prefixes); return 0; } static int unit_file_is_active( sd_bus *bus, const char *name, sd_bus_error *error) { static const char *const active_states[] = { "activating", "active", "reloading", "deactivating", NULL, }; int r; if (!bus) return false; /* If we are looking at a plain or instance things are easy, we can just query the state */ if (unit_name_is_valid(name, UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE)) { _cleanup_free_ char *path = NULL, *buf = NULL; path = unit_dbus_path_from_name(name); if (!path) return -ENOMEM; r = sd_bus_get_property_string( bus, "org.freedesktop.systemd1", path, "org.freedesktop.systemd1.Unit", "ActiveState", error, &buf); if (r < 0) return log_debug_errno(r, "Failed to retrieve unit state: %s", bus_error_message(error, r)); return strv_contains((char**) active_states, buf); } /* Otherwise we need to enumerate. But let's build the most restricted query we can */ if (unit_name_is_valid(name, UNIT_NAME_TEMPLATE)) { _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL, *reply = NULL; const char *at, *prefix, *joined; r = bus_message_new_method_call(bus, &m, bus_systemd_mgr, "ListUnitsByPatterns"); if (r < 0) return r; r = sd_bus_message_append_strv(m, (char**) active_states); if (r < 0) return r; at = strchr(name, '@'); assert(at); prefix = strndupa_safe(name, at + 1 - name); joined = strjoina(prefix, "*", at + 1); r = sd_bus_message_append_strv(m, STRV_MAKE(joined)); if (r < 0) return r; r = sd_bus_call(bus, m, 0, error, &reply); if (r < 0) return log_debug_errno(r, "Failed to list units: %s", bus_error_message(error, r)); r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_ARRAY, "(ssssssouso)"); if (r < 0) return r; r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_STRUCT, "ssssssouso"); if (r < 0) return r; return r > 0; } return -EINVAL; } static int portable_changes_add( PortableChange **changes, size_t *n_changes, int type_or_errno, /* PORTABLE_COPY, PORTABLE_SYMLINK, … if positive, or errno if negative */ const char *path, const char *source) { _cleanup_free_ char *p = NULL, *s = NULL; PortableChange *c; assert(path); assert(!changes == !n_changes); if (type_or_errno >= 0) assert(type_or_errno < _PORTABLE_CHANGE_TYPE_MAX); else assert(type_or_errno >= -ERRNO_MAX); if (!changes) return 0; c = reallocarray(*changes, *n_changes + 1, sizeof(PortableChange)); if (!c) return -ENOMEM; *changes = c; p = strdup(path); if (!p) return -ENOMEM; path_simplify(p); if (source) { s = strdup(source); if (!s) return -ENOMEM; path_simplify(s); } c[(*n_changes)++] = (PortableChange) { .type_or_errno = type_or_errno, .path = TAKE_PTR(p), .source = TAKE_PTR(s), }; return 0; } static int portable_changes_add_with_prefix( PortableChange **changes, size_t *n_changes, int type_or_errno, const char *prefix, const char *path, const char *source) { _cleanup_free_ char *path_buf = NULL, *source_buf = NULL; assert(path); assert(!changes == !n_changes); if (!changes) return 0; if (prefix) { path_buf = path_join(prefix, path); if (!path_buf) return -ENOMEM; path = path_buf; if (source) { source_buf = path_join(prefix, source); if (!source_buf) return -ENOMEM; source = source_buf; } } return portable_changes_add(changes, n_changes, type_or_errno, path, source); } void portable_changes_free(PortableChange *changes, size_t n_changes) { size_t i; assert(changes || n_changes == 0); for (i = 0; i < n_changes; i++) { free(changes[i].path); free(changes[i].source); } free(changes); } static const char *root_setting_from_image(ImageType type) { return IN_SET(type, IMAGE_DIRECTORY, IMAGE_SUBVOLUME) ? "RootDirectory=" : "RootImage="; } static const char *extension_setting_from_image(ImageType type) { return IN_SET(type, IMAGE_DIRECTORY, IMAGE_SUBVOLUME) ? "ExtensionDirectories=" : "ExtensionImages="; } static int make_marker_text(const char *image_path, OrderedHashmap *extension_images, char **ret_text) { _cleanup_free_ char *text = NULL, *escaped_image_path = NULL; Image *ext; assert(image_path); assert(ret_text); escaped_image_path = xescape(image_path, ":"); if (!escaped_image_path) return -ENOMEM; /* If the image is layered, include all layers in the marker as a colon-separated * list of paths, so that we can do exact matches on removal. */ text = strjoin(PORTABLE_DROPIN_MARKER_BEGIN, escaped_image_path); if (!text) return -ENOMEM; ORDERED_HASHMAP_FOREACH(ext, extension_images) { _cleanup_free_ char *escaped = NULL; escaped = xescape(ext->path, ":"); if (!escaped) return -ENOMEM; if (!strextend(&text, ":", escaped)) return -ENOMEM; } if (!strextend(&text, PORTABLE_DROPIN_MARKER_END "\n")) return -ENOMEM; *ret_text = TAKE_PTR(text); return 0; } static int append_release_log_fields( char **text, const PortableMetadata *release, ImageClass type, const char *field_name) { static const char *const field_versions[_IMAGE_CLASS_MAX][4]= { [IMAGE_PORTABLE] = { "IMAGE_VERSION", "VERSION_ID", "BUILD_ID", NULL }, [IMAGE_SYSEXT] = { "SYSEXT_IMAGE_VERSION", "SYSEXT_VERSION_ID", "SYSEXT_BUILD_ID", NULL }, }; static const char *const field_ids[_IMAGE_CLASS_MAX][3]= { [IMAGE_PORTABLE] = { "IMAGE_ID", "ID", NULL }, [IMAGE_SYSEXT] = { "SYSEXT_IMAGE_ID", "SYSEXT_ID", NULL }, }; _cleanup_strv_free_ char **fields = NULL; const char *id = NULL, *version = NULL; int r; assert(IN_SET(type, IMAGE_PORTABLE, IMAGE_SYSEXT)); assert(!strv_isempty((char *const *)field_ids[type])); assert(!strv_isempty((char *const *)field_versions[type])); assert(field_name); assert(text); if (!release) return 0; /* Nothing to do. */ r = load_env_file_pairs_fd(release->fd, release->name, &fields); if (r < 0) return log_debug_errno(r, "Failed to parse '%s': %m", release->name); /* Find an ID first, in order of preference from more specific to less specific: IMAGE_ID -> ID */ id = strv_find_first_field((char *const *)field_ids[type], fields); /* Then the version, same logic, prefer the more specific one */ version = strv_find_first_field((char *const *)field_versions[type], fields); /* If there's no valid version to be found, simply omit it. */ if (!id && !version) return 0; if (!strextend(text, "LogExtraFields=", field_name, "=", strempty(id), id && version ? "_" : "", strempty(version), "\n")) return -ENOMEM; return 0; } static int install_chroot_dropin( const char *image_path, ImageType type, OrderedHashmap *extension_images, OrderedHashmap *extension_releases, const PortableMetadata *m, const PortableMetadata *os_release, const char *dropin_dir, PortableFlags flags, char **ret_dropin, PortableChange **changes, size_t *n_changes) { _cleanup_free_ char *text = NULL, *dropin = NULL; int r; assert(image_path); assert(m); assert(dropin_dir); dropin = path_join(dropin_dir, "20-portable.conf"); if (!dropin) return -ENOMEM; r = make_marker_text(image_path, extension_images, &text); if (r < 0) return log_debug_errno(r, "Failed to generate marker string for portable drop-in: %m"); if (endswith(m->name, ".service")) { const char *root_type; _cleanup_free_ char *base_name = NULL; Image *ext; root_type = root_setting_from_image(type); r = path_extract_filename(m->image_path ?: image_path, &base_name); if (r < 0) return log_debug_errno(r, "Failed to extract basename from '%s': %m", m->image_path ?: image_path); if (!strextend(&text, "\n" "[Service]\n", root_type, image_path, "\n" "Environment=PORTABLE=", base_name, "\n" "LogExtraFields=PORTABLE=", base_name, "\n")) return -ENOMEM; /* If we have a single image then PORTABLE= will point to it, so we add * PORTABLE_NAME_AND_VERSION= with the os-release fields and we are done. But if we have * extensions, PORTABLE= will point to the image where the current unit was found in. So we * also list PORTABLE_ROOT= and PORTABLE_ROOT_NAME_AND_VERSION= for the base image, and * PORTABLE_EXTENSION= and PORTABLE_EXTENSION_NAME_AND_VERSION= for each extension, so that * all needed metadata is available. */ if (ordered_hashmap_isempty(extension_images)) r = append_release_log_fields(&text, os_release, IMAGE_PORTABLE, "PORTABLE_NAME_AND_VERSION"); else { _cleanup_free_ char *root_base_name = NULL; r = path_extract_filename(image_path, &root_base_name); if (r < 0) return log_debug_errno(r, "Failed to extract basename from '%s': %m", image_path); if (!strextend(&text, "Environment=PORTABLE_ROOT=", root_base_name, "\n", "LogExtraFields=PORTABLE_ROOT=", root_base_name, "\n")) return -ENOMEM; r = append_release_log_fields(&text, os_release, IMAGE_PORTABLE, "PORTABLE_ROOT_NAME_AND_VERSION"); } if (r < 0) return r; if (m->image_path && !path_equal(m->image_path, image_path)) ORDERED_HASHMAP_FOREACH(ext, extension_images) { _cleanup_free_ char *extension_base_name = NULL; r = path_extract_filename(ext->path, &extension_base_name); if (r < 0) return log_debug_errno(r, "Failed to extract basename from '%s': %m", ext->path); if (!strextend(&text, "\n", extension_setting_from_image(ext->type), ext->path, /* With --force tell PID1 to avoid enforcing that the image and * extension-release. have to match. */ !IN_SET(type, IMAGE_DIRECTORY, IMAGE_SUBVOLUME) && FLAGS_SET(flags, PORTABLE_FORCE_SYSEXT) ? ":x-systemd.relax-extension-release-check\n" : "\n", /* In PORTABLE= we list the 'main' image name for this unit * (the image where the unit was extracted from), but we are * stacking multiple images, so list those too. */ "LogExtraFields=PORTABLE_EXTENSION=", extension_base_name, "\n")) return -ENOMEM; /* Look for image/version identifiers in the extension release files. We * look for all possible IDs, but typically only 1 or 2 will be set, so * the number of fields added shouldn't be too large. We prefix the DDI * name to the value, so that we can add the same field multiple times and * still be able to identify what applies to what. */ r = append_release_log_fields(&text, ordered_hashmap_get(extension_releases, ext->name), IMAGE_SYSEXT, "PORTABLE_EXTENSION_NAME_AND_VERSION"); if (r < 0) return r; } } r = write_string_file(dropin, text, WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_ATOMIC|WRITE_STRING_FILE_SYNC); if (r < 0) return log_debug_errno(r, "Failed to write '%s': %m", dropin); (void) portable_changes_add(changes, n_changes, PORTABLE_WRITE, dropin, NULL); if (ret_dropin) *ret_dropin = TAKE_PTR(dropin); return 0; } static int install_profile_dropin( const char *image_path, const PortableMetadata *m, const char *dropin_dir, const char *profile, PortableFlags flags, char **ret_dropin, PortableChange **changes, size_t *n_changes) { _cleanup_free_ char *dropin = NULL, *from = NULL; int r; assert(image_path); assert(m); assert(dropin_dir); if (!profile) return 0; r = find_portable_profile(profile, m->name, &from); if (r < 0) { if (r != -ENOENT) return log_debug_errno(errno, "Profile '%s' is not accessible: %m", profile); log_debug_errno(errno, "Skipping link to profile '%s', as it does not exist: %m", profile); return 0; } dropin = path_join(dropin_dir, "10-profile.conf"); if (!dropin) return -ENOMEM; if (flags & PORTABLE_PREFER_COPY) { r = copy_file_atomic(from, dropin, 0644, COPY_REFLINK|COPY_FSYNC); if (r < 0) return log_debug_errno(r, "Failed to copy %s %s %s: %m", from, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), dropin); (void) portable_changes_add(changes, n_changes, PORTABLE_COPY, dropin, from); } else { if (symlink(from, dropin) < 0) return log_debug_errno(errno, "Failed to link %s %s %s: %m", from, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), dropin); (void) portable_changes_add(changes, n_changes, PORTABLE_SYMLINK, dropin, from); } if (ret_dropin) *ret_dropin = TAKE_PTR(dropin); return 0; } static const char *attached_path(const LookupPaths *paths, PortableFlags flags) { const char *where; assert(paths); if (flags & PORTABLE_RUNTIME) where = paths->runtime_attached; else where = paths->persistent_attached; assert(where); return where; } static int attach_unit_file( const LookupPaths *paths, const char *image_path, ImageType type, OrderedHashmap *extension_images, OrderedHashmap *extension_releases, const PortableMetadata *m, const PortableMetadata *os_release, const char *profile, PortableFlags flags, PortableChange **changes, size_t *n_changes) { _cleanup_(unlink_and_freep) char *chroot_dropin = NULL, *profile_dropin = NULL; _cleanup_(rmdir_and_freep) char *dropin_dir = NULL; _cleanup_free_ char *path = NULL; const char *where; int r; assert(paths); assert(image_path); assert(m); assert(PORTABLE_METADATA_IS_UNIT(m)); where = attached_path(paths, flags); (void) mkdir_parents(where, 0755); if (mkdir(where, 0755) < 0) { if (errno != EEXIST) return log_debug_errno(errno, "Failed to create attach directory %s: %m", where); } else (void) portable_changes_add(changes, n_changes, PORTABLE_MKDIR, where, NULL); path = path_join(where, m->name); if (!path) return -ENOMEM; dropin_dir = strjoin(path, ".d"); if (!dropin_dir) return -ENOMEM; if (mkdir(dropin_dir, 0755) < 0) { if (errno != EEXIST) return log_debug_errno(errno, "Failed to create drop-in directory %s: %m", dropin_dir); } else (void) portable_changes_add(changes, n_changes, PORTABLE_MKDIR, dropin_dir, NULL); /* We install the drop-ins first, and the actual unit file last to achieve somewhat atomic behaviour if PID 1 * is reloaded while we are creating things here: as long as only the drop-ins exist the unit doesn't exist at * all for PID 1. */ r = install_chroot_dropin(image_path, type, extension_images, extension_releases, m, os_release, dropin_dir, flags, &chroot_dropin, changes, n_changes); if (r < 0) return r; r = install_profile_dropin(image_path, m, dropin_dir, profile, flags, &profile_dropin, changes, n_changes); if (r < 0) return r; if ((flags & PORTABLE_PREFER_SYMLINK) && m->source) { if (symlink(m->source, path) < 0) return log_debug_errno(errno, "Failed to symlink unit file '%s': %m", path); (void) portable_changes_add(changes, n_changes, PORTABLE_SYMLINK, path, m->source); } else { _cleanup_(unlink_and_freep) char *tmp = NULL; _cleanup_close_ int fd = -EBADF; (void) mac_selinux_create_file_prepare_label(path, m->selinux_label); fd = open_tmpfile_linkable(path, O_WRONLY|O_CLOEXEC, &tmp); mac_selinux_create_file_clear(); /* Clear immediately in case of errors */ if (fd < 0) return log_debug_errno(fd, "Failed to create unit file '%s': %m", path); r = copy_bytes(m->fd, fd, UINT64_MAX, COPY_REFLINK); if (r < 0) return log_debug_errno(r, "Failed to copy unit file '%s': %m", path); if (fchmod(fd, 0644) < 0) return log_debug_errno(errno, "Failed to change unit file access mode for '%s': %m", path); r = link_tmpfile(fd, tmp, path, LINK_TMPFILE_SYNC); if (r < 0) return log_debug_errno(r, "Failed to install unit file '%s': %m", path); tmp = mfree(tmp); (void) portable_changes_add(changes, n_changes, PORTABLE_COPY, path, m->source); } /* All is established now, now let's disable any rollbacks */ chroot_dropin = mfree(chroot_dropin); profile_dropin = mfree(profile_dropin); dropin_dir = mfree(dropin_dir); return 0; } static int image_symlink( const char *image_path, PortableFlags flags, char **ret) { const char *fn, *where; char *joined = NULL; assert(image_path); assert(ret); fn = last_path_component(image_path); if (flags & PORTABLE_RUNTIME) where = "/run/portables/"; else where = "/etc/portables/"; joined = strjoin(where, fn); if (!joined) return -ENOMEM; *ret = joined; return 0; } static int install_image_symlink( const char *image_path, PortableFlags flags, PortableChange **changes, size_t *n_changes) { _cleanup_free_ char *sl = NULL; int r; assert(image_path); /* If the image is outside of the image search also link it into it, so that it can be found with short image * names and is listed among the images. */ if (image_in_search_path(IMAGE_PORTABLE, NULL, image_path)) return 0; r = image_symlink(image_path, flags, &sl); if (r < 0) return log_debug_errno(r, "Failed to generate image symlink path: %m"); (void) mkdir_parents(sl, 0755); if (symlink(image_path, sl) < 0) return log_debug_errno(errno, "Failed to link %s %s %s: %m", image_path, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), sl); (void) portable_changes_add(changes, n_changes, PORTABLE_SYMLINK, sl, image_path); return 0; } static int install_image_and_extensions_symlinks( const Image *image, OrderedHashmap *extension_images, PortableFlags flags, PortableChange **changes, size_t *n_changes) { Image *ext; int r; assert(image); ORDERED_HASHMAP_FOREACH(ext, extension_images) { r = install_image_symlink(ext->path, flags, changes, n_changes); if (r < 0) return r; } r = install_image_symlink(image->path, flags, changes, n_changes); if (r < 0) return r; return 0; } static bool prefix_matches_compatible(char **matches, char **valid_prefixes) { /* Checks if all 'matches' are included in the list of 'valid_prefixes' */ STRV_FOREACH(m, matches) if (!strv_contains(valid_prefixes, *m)) return false; return true; } int portable_attach( sd_bus *bus, const char *name_or_path, char **matches, const char *profile, char **extension_image_paths, const ImagePolicy *image_policy, PortableFlags flags, PortableChange **changes, size_t *n_changes, sd_bus_error *error) { _cleanup_ordered_hashmap_free_ OrderedHashmap *extension_images = NULL, *extension_releases = NULL; _cleanup_(portable_metadata_unrefp) PortableMetadata *os_release = NULL; _cleanup_hashmap_free_ Hashmap *unit_files = NULL; _cleanup_(lookup_paths_free) LookupPaths paths = {}; _cleanup_strv_free_ char **valid_prefixes = NULL; _cleanup_(image_unrefp) Image *image = NULL; PortableMetadata *item; int r; r = extract_image_and_extensions( name_or_path, matches, extension_image_paths, /* validate_sysext= */ true, /* relax_extension_release_check= */ FLAGS_SET(flags, PORTABLE_FORCE_SYSEXT), image_policy, &image, &extension_images, &extension_releases, &os_release, &unit_files, &valid_prefixes, error); if (r < 0) return r; if (valid_prefixes && !prefix_matches_compatible(matches, valid_prefixes)) { _cleanup_free_ char *matches_joined = NULL, *extensions_joined = NULL, *valid_prefixes_joined = NULL; matches_joined = strv_join(matches, "', '"); if (!matches_joined) return -ENOMEM; extensions_joined = strv_join(extension_image_paths, ", "); if (!extensions_joined) return -ENOMEM; valid_prefixes_joined = strv_join(valid_prefixes, ", "); if (!valid_prefixes_joined) return -ENOMEM; return sd_bus_error_setf( error, SD_BUS_ERROR_INVALID_ARGS, "Selected matches '%s' are not compatible with portable service image '%s%s%s', refusing. (Acceptable prefix matches are: %s)", matches_joined, image->path, isempty(extensions_joined) ? "" : "' or any of its extensions '", strempty(extensions_joined), valid_prefixes_joined); } if (hashmap_isempty(unit_files)) { _cleanup_free_ char *extensions_joined = strv_join(extension_image_paths, ", "); if (!extensions_joined) return -ENOMEM; return sd_bus_error_setf( error, SD_BUS_ERROR_INVALID_ARGS, "Couldn't find any matching unit files in image '%s%s%s', refusing.", image->path, isempty(extensions_joined) ? "" : "' or any of its extensions '", strempty(extensions_joined)); } r = lookup_paths_init(&paths, RUNTIME_SCOPE_SYSTEM, /* flags= */ 0, NULL); if (r < 0) return r; if (!FLAGS_SET(flags, PORTABLE_REATTACH) && !FLAGS_SET(flags, PORTABLE_FORCE_ATTACH)) HASHMAP_FOREACH(item, unit_files) { r = unit_file_exists(RUNTIME_SCOPE_SYSTEM, &paths, item->name); if (r < 0) return sd_bus_error_set_errnof(error, r, "Failed to determine whether unit '%s' exists on the host: %m", item->name); if (r > 0) return sd_bus_error_setf(error, BUS_ERROR_UNIT_EXISTS, "Unit file '%s' exists on the host already, refusing.", item->name); r = unit_file_is_active(bus, item->name, error); if (r < 0) return r; if (r > 0) return sd_bus_error_setf(error, BUS_ERROR_UNIT_EXISTS, "Unit file '%s' is active already, refusing.", item->name); } HASHMAP_FOREACH(item, unit_files) { r = attach_unit_file(&paths, image->path, image->type, extension_images, extension_releases, item, os_release, profile, flags, changes, n_changes); if (r < 0) return sd_bus_error_set_errnof(error, r, "Failed to attach unit '%s': %m", item->name); } /* We don't care too much for the image symlink, it's just a convenience thing, it's not necessary for proper * operation otherwise. */ (void) install_image_and_extensions_symlinks(image, extension_images, flags, changes, n_changes); return 0; } static bool marker_matches_images(const char *marker, const char *name_or_path, char **extension_image_paths) { _cleanup_strv_free_ char **root_and_extensions = NULL; const char *a; int r; assert(marker); assert(name_or_path); /* If extensions were used when attaching, the marker will be a colon-separated * list of images/paths. We enforce strict 1:1 matching, so that we are sure * we are detaching exactly what was attached. * For each image, starting with the root, we look for a token in the marker, * and return a negative answer on any non-matching combination. */ root_and_extensions = strv_new(name_or_path); if (!root_and_extensions) return -ENOMEM; r = strv_extend_strv(&root_and_extensions, extension_image_paths, false); if (r < 0) return r; STRV_FOREACH(image_name_or_path, root_and_extensions) { _cleanup_free_ char *image = NULL; r = extract_first_word(&marker, &image, ":", EXTRACT_UNQUOTE|EXTRACT_RETAIN_ESCAPE); if (r < 0) return log_debug_errno(r, "Failed to parse marker: %s", marker); if (r == 0) return false; a = last_path_component(image); if (image_name_is_valid(*image_name_or_path)) { const char *e, *underscore; /* We shall match against an image name. In that case let's compare the last component, and optionally * allow either a suffix of ".raw" or a series of "/". * But allow matching on a different version of the same image, when a "_" is used as a separator. */ underscore = strchr(*image_name_or_path, '_'); if (underscore) { if (strneq(a, *image_name_or_path, underscore - *image_name_or_path)) continue; return false; } e = startswith(a, *image_name_or_path); if (!e) return false; if(!(e[strspn(e, "/")] == 0 || streq(e, ".raw"))) return false; } else { const char *b, *underscore; size_t l; /* We shall match against a path. Let's ignore any prefix here though, as often there are many ways to * reach the same file. However, in this mode, let's validate any file suffix. * But also ensure that we don't fail if both components don't have a '/' at all * (strcspn returns the full length of the string in that case, which might not * match as the versions might differ). */ l = strcspn(a, "/"); b = last_path_component(*image_name_or_path); if ((a[l] != '/') != !strchr(b, '/')) /* One is a directory, the other is not */ return false; if (a[l] != 0 && strcspn(b, "/") != l) return false; underscore = strchr(b, '_'); if (underscore) l = underscore - b; else { /* Either component could be versioned */ underscore = strchr(a, '_'); if (underscore) l = underscore - a; } if (!strneq(a, b, l)) return false; } } return true; } static int test_chroot_dropin( DIR *d, const char *where, const char *fname, const char *name_or_path, char **extension_image_paths, char **ret_marker) { _cleanup_free_ char *line = NULL, *marker = NULL; _cleanup_fclose_ FILE *f = NULL; _cleanup_close_ int fd = -EBADF; const char *p, *e, *k; int r; assert(d); assert(where); assert(fname); /* We recognize unis created from portable images via the drop-in we created for them */ p = strjoina(fname, ".d/20-portable.conf"); fd = openat(dirfd(d), p, O_RDONLY|O_CLOEXEC); if (fd < 0) { if (errno == ENOENT) return 0; return log_debug_errno(errno, "Failed to open %s/%s: %m", where, p); } r = take_fdopen_unlocked(&fd, "r", &f); if (r < 0) return log_debug_errno(r, "Failed to convert file handle: %m"); r = read_line(f, LONG_LINE_MAX, &line); if (r < 0) return log_debug_errno(r, "Failed to read from %s/%s: %m", where, p); e = startswith(line, PORTABLE_DROPIN_MARKER_BEGIN); if (!e) return 0; k = endswith(e, PORTABLE_DROPIN_MARKER_END); if (!k) return 0; marker = strndup(e, k - e); if (!marker) return -ENOMEM; if (!name_or_path) r = true; else r = marker_matches_images(marker, name_or_path, extension_image_paths); if (ret_marker) *ret_marker = TAKE_PTR(marker); return r; } int portable_detach( sd_bus *bus, const char *name_or_path, char **extension_image_paths, PortableFlags flags, PortableChange **changes, size_t *n_changes, sd_bus_error *error) { _cleanup_(lookup_paths_free) LookupPaths paths = {}; _cleanup_set_free_ Set *unit_files = NULL, *markers = NULL; _cleanup_free_ char *extensions = NULL; _cleanup_closedir_ DIR *d = NULL; const char *where, *item; int ret = 0; int r; assert(name_or_path); r = lookup_paths_init(&paths, RUNTIME_SCOPE_SYSTEM, /* flags= */ 0, NULL); if (r < 0) return r; where = attached_path(&paths, flags); d = opendir(where); if (!d) { if (errno == ENOENT) goto not_found; return log_debug_errno(errno, "Failed to open '%s' directory: %m", where); } FOREACH_DIRENT(de, d, return log_debug_errno(errno, "Failed to enumerate '%s' directory: %m", where)) { _cleanup_free_ char *marker = NULL, *unit_name = NULL; const char *dot; /* When a portable service is enabled with "portablectl --copy=symlink --enable --now attach", * and is disabled with "portablectl --enable --now detach", which calls DisableUnitFilesWithFlags * DBus method, the main unit file is removed, but its drop-ins are not. Hence, here we need * to list both main unit files and drop-in directories (without the main unit files). */ dot = endswith(de->d_name, ".d"); if (dot) unit_name = strndup(de->d_name, dot - de->d_name); else unit_name = strdup(de->d_name); if (!unit_name) return -ENOMEM; if (!unit_name_is_valid(unit_name, UNIT_NAME_ANY)) continue; /* Filter out duplicates */ if (set_contains(unit_files, unit_name)) continue; if (dot ? !IN_SET(de->d_type, DT_LNK, DT_DIR) : !IN_SET(de->d_type, DT_LNK, DT_REG)) continue; r = test_chroot_dropin(d, where, unit_name, name_or_path, extension_image_paths, &marker); if (r < 0) return r; if (r == 0) continue; if (!FLAGS_SET(flags, PORTABLE_REATTACH) && !FLAGS_SET(flags, PORTABLE_FORCE_ATTACH)) { r = unit_file_is_active(bus, unit_name, error); if (r < 0) return r; if (r > 0) return sd_bus_error_setf(error, BUS_ERROR_UNIT_EXISTS, "Unit file '%s' is active, can't detach.", unit_name); } r = set_ensure_consume(&unit_files, &string_hash_ops_free, TAKE_PTR(unit_name)); if (r < 0) return log_oom_debug(); for (const char *p = marker;;) { _cleanup_free_ char *image = NULL; r = extract_first_word(&p, &image, ":", EXTRACT_UNESCAPE_SEPARATORS|EXTRACT_RETAIN_ESCAPE); if (r < 0) return log_debug_errno(r, "Failed to parse marker: %s", p); if (r == 0) break; if (path_is_absolute(image) && !image_in_search_path(IMAGE_PORTABLE, NULL, image)) { r = set_ensure_consume(&markers, &path_hash_ops_free, TAKE_PTR(image)); if (r < 0) return r; } } } if (set_isempty(unit_files)) goto not_found; SET_FOREACH(item, unit_files) { _cleanup_free_ char *md = NULL; if (unlinkat(dirfd(d), item, 0) < 0) { log_debug_errno(errno, "Can't remove unit file %s/%s: %m", where, item); if (errno != ENOENT && ret >= 0) ret = -errno; } else portable_changes_add_with_prefix(changes, n_changes, PORTABLE_UNLINK, where, item, NULL); FOREACH_STRING(suffix, ".d/10-profile.conf", ".d/20-portable.conf") { _cleanup_free_ char *dropin = NULL; dropin = strjoin(item, suffix); if (!dropin) return -ENOMEM; if (unlinkat(dirfd(d), dropin, 0) < 0) { log_debug_errno(errno, "Can't remove drop-in %s/%s: %m", where, dropin); if (errno != ENOENT && ret >= 0) ret = -errno; } else portable_changes_add_with_prefix(changes, n_changes, PORTABLE_UNLINK, where, dropin, NULL); } md = strjoin(item, ".d"); if (!md) return -ENOMEM; if (unlinkat(dirfd(d), md, AT_REMOVEDIR) < 0) { log_debug_errno(errno, "Can't remove drop-in directory %s/%s: %m", where, md); if (errno != ENOENT && ret >= 0) ret = -errno; } else portable_changes_add_with_prefix(changes, n_changes, PORTABLE_UNLINK, where, md, NULL); } /* Now, also drop any image symlink, for images outside of the sarch path */ SET_FOREACH(item, markers) { _cleanup_free_ char *sl = NULL; struct stat st; r = image_symlink(item, flags, &sl); if (r < 0) { log_debug_errno(r, "Failed to determine image symlink for '%s', ignoring: %m", item); continue; } if (lstat(sl, &st) < 0) { log_debug_errno(errno, "Failed to stat '%s', ignoring: %m", sl); continue; } if (!S_ISLNK(st.st_mode)) { log_debug("Image '%s' is not a symlink, ignoring.", sl); continue; } if (unlink(sl) < 0) { log_debug_errno(errno, "Can't remove image symlink '%s': %m", sl); if (errno != ENOENT && ret >= 0) ret = -errno; } else portable_changes_add(changes, n_changes, PORTABLE_UNLINK, sl, NULL); } /* Try to remove the unit file directory, if we can */ if (rmdir(where) >= 0) portable_changes_add(changes, n_changes, PORTABLE_UNLINK, where, NULL); return ret; not_found: extensions = strv_join(extension_image_paths, ", "); if (!extensions) return -ENOMEM; r = sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_UNIT, "No unit files associated with '%s%s%s' found attached to the system. Image not attached?", name_or_path, isempty(extensions) ? "" : "' or any of its extensions '", isempty(extensions) ? "" : extensions); return log_debug_errno(r, "%s", error->message); } static int portable_get_state_internal( sd_bus *bus, const char *name_or_path, char **extension_image_paths, PortableFlags flags, PortableState *ret, sd_bus_error *error) { _cleanup_(lookup_paths_free) LookupPaths paths = {}; bool found_enabled = false, found_running = false; _cleanup_set_free_ Set *unit_files = NULL; _cleanup_closedir_ DIR *d = NULL; const char *where; int r; assert(name_or_path); assert(ret); r = lookup_paths_init(&paths, RUNTIME_SCOPE_SYSTEM, /* flags= */ 0, NULL); if (r < 0) return r; where = attached_path(&paths, flags); d = opendir(where); if (!d) { if (errno == ENOENT) { /* If the 'attached' directory doesn't exist at all, then we know for sure this image isn't attached. */ *ret = PORTABLE_DETACHED; return 0; } return log_debug_errno(errno, "Failed to open '%s' directory: %m", where); } FOREACH_DIRENT(de, d, return log_debug_errno(errno, "Failed to enumerate '%s' directory: %m", where)) { UnitFileState state; if (!unit_name_is_valid(de->d_name, UNIT_NAME_ANY)) continue; /* Filter out duplicates */ if (set_contains(unit_files, de->d_name)) continue; if (!IN_SET(de->d_type, DT_LNK, DT_REG)) continue; r = test_chroot_dropin(d, where, de->d_name, name_or_path, extension_image_paths, NULL); if (r < 0) return r; if (r == 0) continue; r = unit_file_lookup_state(RUNTIME_SCOPE_SYSTEM, &paths, de->d_name, &state); if (r < 0) return log_debug_errno(r, "Failed to determine unit file state of '%s': %m", de->d_name); if (!IN_SET(state, UNIT_FILE_STATIC, UNIT_FILE_DISABLED, UNIT_FILE_LINKED, UNIT_FILE_LINKED_RUNTIME)) found_enabled = true; r = unit_file_is_active(bus, de->d_name, error); if (r < 0) return r; if (r > 0) found_running = true; r = set_put_strdup(&unit_files, de->d_name); if (r < 0) return log_debug_errno(r, "Failed to add unit name '%s' to set: %m", de->d_name); } *ret = found_running ? (!set_isempty(unit_files) && (flags & PORTABLE_RUNTIME) ? PORTABLE_RUNNING_RUNTIME : PORTABLE_RUNNING) : found_enabled ? (flags & PORTABLE_RUNTIME ? PORTABLE_ENABLED_RUNTIME : PORTABLE_ENABLED) : !set_isempty(unit_files) ? (flags & PORTABLE_RUNTIME ? PORTABLE_ATTACHED_RUNTIME : PORTABLE_ATTACHED) : PORTABLE_DETACHED; return 0; } int portable_get_state( sd_bus *bus, const char *name_or_path, char **extension_image_paths, PortableFlags flags, PortableState *ret, sd_bus_error *error) { PortableState state; int r; assert(name_or_path); assert(ret); /* We look for matching units twice: once in the regular directories, and once in the runtime directories — but * the latter only if we didn't find anything in the former. */ r = portable_get_state_internal(bus, name_or_path, extension_image_paths, flags & ~PORTABLE_RUNTIME, &state, error); if (r < 0) return r; if (state == PORTABLE_DETACHED) { r = portable_get_state_internal(bus, name_or_path, extension_image_paths, flags | PORTABLE_RUNTIME, &state, error); if (r < 0) return r; } *ret = state; return 0; } int portable_get_profiles(char ***ret) { assert(ret); return conf_files_list_nulstr(ret, NULL, NULL, CONF_FILES_DIRECTORY|CONF_FILES_BASENAME|CONF_FILES_FILTER_MASKED, PORTABLE_PROFILE_DIRS); } static const char* const portable_change_type_table[_PORTABLE_CHANGE_TYPE_MAX] = { [PORTABLE_COPY] = "copy", [PORTABLE_MKDIR] = "mkdir", [PORTABLE_SYMLINK] = "symlink", [PORTABLE_UNLINK] = "unlink", [PORTABLE_WRITE] = "write", }; DEFINE_STRING_TABLE_LOOKUP(portable_change_type, int); static const char* const portable_state_table[_PORTABLE_STATE_MAX] = { [PORTABLE_DETACHED] = "detached", [PORTABLE_ATTACHED] = "attached", [PORTABLE_ATTACHED_RUNTIME] = "attached-runtime", [PORTABLE_ENABLED] = "enabled", [PORTABLE_ENABLED_RUNTIME] = "enabled-runtime", [PORTABLE_RUNNING] = "running", [PORTABLE_RUNNING_RUNTIME] = "running-runtime", }; DEFINE_STRING_TABLE_LOOKUP(portable_state, PortableState);