/* SPDX-License-Identifier: LGPL-2.1-or-later */ #include #include "bus-common-errors.h" #include "bus-error.h" #include "conf-files.h" #include "copy.h" #include "def.h" #include "dirent-util.h" #include "dissect-image.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 "machine-image.h" #include "mkdir.h" #include "nulstr-util.h" #include "os-util.h" #include "path-lookup.h" #include "portable.h" #include "process-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" static const char profile_dirs[] = CONF_PATHS_NULSTR("systemd/portable/profile"); /* 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; char **i; 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, int fd) { PortableMetadata *m; m = malloc0(offsetof(PortableMetadata, name) + strlen(name) + 1); if (!m) return NULL; strcpy(m->name, name); m->fd = fd; return m; } PortableMetadata *portable_metadata_unref(PortableMetadata *i) { if (!i) return NULL; safe_close(i->fd); free(i->source); 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_item( int socket_fd, const char *name, int fd) { CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(int))) control = {}; struct iovec iovec; struct msghdr mh = { .msg_control = &control, .msg_controllen = sizeof(control), .msg_iov = &iovec, .msg_iovlen = 1, }; struct cmsghdr *cmsg; _cleanup_close_ int data_fd = -1; assert(socket_fd >= 0); assert(name); assert(fd >= 0); data_fd = fd_duplicate_data_fd(fd); if (data_fd < 0) return data_fd; cmsg = CMSG_FIRSTHDR(&mh); cmsg->cmsg_level = SOL_SOCKET; cmsg->cmsg_type = SCM_RIGHTS; cmsg->cmsg_len = CMSG_LEN(sizeof(int)); memcpy(CMSG_DATA(cmsg), &data_fd, sizeof(int)); iovec = IOVEC_MAKE_STRING(name); if (sendmsg(socket_fd, &mh, MSG_NOSIGNAL) < 0) return -errno; return 0; } static int recv_item( int socket_fd, char **ret_name, int *ret_fd) { CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(int))) control; char buffer[PATH_MAX+2]; struct iovec iov = IOVEC_INIT(buffer, sizeof(buffer)-1); struct msghdr mh = { .msg_control = &control, .msg_controllen = sizeof(control), .msg_iov = &iov, .msg_iovlen = 1, }; struct cmsghdr *cmsg; _cleanup_close_ int found_fd = -1; char *copy; ssize_t n; assert(socket_fd >= 0); assert(ret_name); assert(ret_fd); n = recvmsg_safe(socket_fd, &mh, MSG_CMSG_CLOEXEC); if (n < 0) return (int) n; CMSG_FOREACH(cmsg, &mh) { if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SCM_RIGHTS) { if (cmsg->cmsg_len == CMSG_LEN(sizeof(int))) { assert(found_fd < 0); found_fd = *(int*) CMSG_DATA(cmsg); break; } cmsg_close_all(&mh); return -EIO; } } buffer[n] = 0; copy = strdup(buffer); if (!copy) return -ENOMEM; *ret_name = copy; *ret_fd = TAKE_FD(found_fd); return 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, 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 = -1; _cleanup_free_ char *os_release_path = NULL; char **i; 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 /etc/os-release and send it upstream (or just save it). */ r = open_os_release(where, &os_release_path, &os_release_fd); if (r < 0) log_debug_errno(r, "Couldn't acquire os-release file, ignoring: %m"); else { if (socket_fd >= 0) { r = send_item(socket_fd, "/etc/os-release", 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("/etc/os-release", os_release_fd); if (!os_release) return -ENOMEM; os_release_fd = -1; 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 we mightbe * compiled for a split-usr system but the image might be a legacy-usr one. */ r = lookup_paths_init(&paths, UNIT_FILE_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; struct dirent *de; r = chase_symlinks_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_close_ int fd = -1; 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; dirent_ensure_type(d, de); 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; } if (socket_fd >= 0) { r = send_item(socket_fd, de->d_name, fd); if (r < 0) return log_debug_errno(r, "Failed to send unit metadata to parent: %m"); } m = portable_metadata_new(de->d_name, fd); if (!m) return -ENOMEM; fd = -1; 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, char **matches, 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, LO_FLAGS_PARTSCAN, &d); if (r == -EISDIR) { /* 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 = extract_now(path, matches, -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: %m"); else { _cleanup_(dissected_image_unrefp) DissectedImage *m = NULL; _cleanup_(rmdir_and_freep) char *tmpdir = NULL; _cleanup_(close_pairp) int seq[2] = { -1, -1 }; _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_image(d->fd, NULL, NULL, DISSECT_IMAGE_READ_ONLY|DISSECT_IMAGE_REQUIRE_ROOT|DISSECT_IMAGE_DISCARD_ON_LOOP|DISSECT_IMAGE_RELAX_VAR_CHECK, &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) { seq[0] = safe_close(seq[0]); r = dissected_image_mount(m, tmpdir, UID_INVALID, DISSECT_IMAGE_READ_ONLY|DISSECT_IMAGE_VALIDATE_OS); if (r < 0) { log_debug_errno(r, "Failed to mount dissected image: %m"); goto child_finish; } r = extract_now(tmpdir, matches, 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_free_ char *name = NULL; _cleanup_close_ int fd = -1; r = recv_item(seq[0], &name, &fd); if (r < 0) return log_debug_errno(r, "Failed to receive item: %m"); /* 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(name) && fd < 0) break; if (isempty(name) || fd < 0) return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "Invalid item sent from child."); add = portable_metadata_new(name, fd); if (!add) return -ENOMEM; fd = -1; /* 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)) { assert(!os_release); os_release = TAKE_PTR(add); } else assert_not_reached("Unexpected metadata item from child."); } 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 os-release data, refusing.", path); if (hashmap_isempty(unit_files)) return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Couldn't find any matching unit files in image '%s', refusing.", path); if (ret_unit_files) *ret_unit_files = TAKE_PTR(unit_files); if (ret_os_release) *ret_os_release = TAKE_PTR(os_release); return 0; } int portable_extract( const char *name_or_path, char **matches, PortableMetadata **ret_os_release, Hashmap **ret_unit_files, sd_bus_error *error) { _cleanup_(image_unrefp) Image *image = NULL; int r; assert(name_or_path); r = image_find_harder(IMAGE_PORTABLE, name_or_path, &image); if (r < 0) return r; return portable_extract_by_path(image->path, matches, ret_os_release, ret_unit_files, error); } 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 = sd_bus_message_new_method_call( bus, &m, "org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "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(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, PortableChangeType type, const char *path, const char *source) { _cleanup_free_ char *p = NULL, *s = NULL; PortableChange *c; assert(path); assert(!changes == !n_changes); 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, false); if (source) { s = strdup(source); if (!s) return -ENOMEM; path_simplify(s, false); } c[(*n_changes)++] = (PortableChange) { .type = type, .path = TAKE_PTR(p), .source = TAKE_PTR(s), }; return 0; } static int portable_changes_add_with_prefix( PortableChange **changes, size_t *n_changes, PortableChangeType type, const char *prefix, const char *path, const char *source) { assert(path); assert(!changes == !n_changes); if (!changes) return 0; if (prefix) { path = prefix_roota(prefix, path); if (source) source = prefix_roota(prefix, source); } return portable_changes_add(changes, n_changes, type, 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 int install_chroot_dropin( const char *image_path, ImageType type, const PortableMetadata *m, const char *dropin_dir, 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; text = strjoin(PORTABLE_DROPIN_MARKER_BEGIN, image_path, PORTABLE_DROPIN_MARKER_END "\n"); if (!text) return -ENOMEM; if (endswith(m->name, ".service")) { const char *os_release_source; if (access("/etc/os-release", F_OK) < 0) { if (errno != ENOENT) return log_debug_errno(errno, "Failed to check if /etc/os-release exists: %m"); os_release_source = "/usr/lib/os-release"; } else os_release_source = "/etc/os-release"; if (!strextend(&text, "\n" "[Service]\n", IN_SET(type, IMAGE_DIRECTORY, IMAGE_SUBVOLUME) ? "RootDirectory=" : "RootImage=", image_path, "\n" "Environment=PORTABLE=", basename(image_path), "\n" "BindReadOnlyPaths=", os_release_source, ":/run/host/os-release\n" "LogExtraFields=PORTABLE=", basename(image_path), "\n")) return -ENOMEM; } r = write_string_file(dropin, text, WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_ATOMIC); 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 find_profile(const char *name, const char *unit, char **ret) { const char *p, *dot; assert(name); assert(ret); assert_se(dot = strrchr(unit, '.')); NULSTR_FOREACH(p, profile_dirs) { _cleanup_free_ char *joined; joined = strjoin(p, "/", name, "/", dot + 1, ".conf"); if (!joined) return -ENOMEM; if (laccess(joined, F_OK) >= 0) { *ret = TAKE_PTR(joined); return 0; } if (errno != ENOENT) return -errno; } return -ENOENT; } 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_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, 0, 0, COPY_REFLINK); if (r < 0) return log_debug_errno(r, "Failed to copy %s %s %s: %m", from, special_glyph(SPECIAL_GLYPH_ARROW), 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), 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, const PortableMetadata *m, 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; const char *where, *path; 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 -errno; } else (void) portable_changes_add(changes, n_changes, PORTABLE_MKDIR, where, NULL); path = prefix_roota(where, m->name); dropin_dir = strjoin(path, ".d"); if (!dropin_dir) return -ENOMEM; if (mkdir(dropin_dir, 0755) < 0) { if (errno != EEXIST) return -errno; } 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, m, dropin_dir, &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 = -1; fd = open_tmpfile_linkable(path, O_WRONLY|O_CLOEXEC, &tmp); 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); 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, 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), sl); (void) portable_changes_add(changes, n_changes, PORTABLE_SYMLINK, sl, image_path); return 0; } int portable_attach( sd_bus *bus, const char *name_or_path, char **matches, const char *profile, PortableFlags flags, PortableChange **changes, size_t *n_changes, sd_bus_error *error) { _cleanup_hashmap_free_ Hashmap *unit_files = NULL; _cleanup_(lookup_paths_free) LookupPaths paths = {}; _cleanup_(image_unrefp) Image *image = NULL; PortableMetadata *item; int r; assert(name_or_path); r = image_find_harder(IMAGE_PORTABLE, name_or_path, &image); if (r < 0) return r; r = portable_extract_by_path(image->path, matches, NULL, &unit_files, error); if (r < 0) return r; r = lookup_paths_init(&paths, UNIT_FILE_SYSTEM, LOOKUP_PATHS_SPLIT_USR, NULL); if (r < 0) return r; HASHMAP_FOREACH(item, unit_files) { r = unit_file_exists(UNIT_FILE_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, item, profile, flags, changes, n_changes); if (r < 0) return r; } /* 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_symlink(image->path, flags, changes, n_changes); return 0; } static bool marker_matches_image(const char *marker, const char *name_or_path) { const char *a; assert(marker); assert(name_or_path); a = last_path_component(marker); if (image_name_is_valid(name_or_path)) { const char *e; /* 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 "/". */ e = startswith(a, name_or_path); if (!e) return false; return e[strspn(e, "/")] == 0 || streq(e, ".raw"); } else { const char *b; 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. */ l = strcspn(a, "/"); b = last_path_component(name_or_path); if (strcspn(b, "/") != l) return false; return memcmp(a, b, l) == 0; } } static int test_chroot_dropin( DIR *d, const char *where, const char *fname, const char *name_or_path, char **ret_marker) { _cleanup_free_ char *line = NULL, *marker = NULL; _cleanup_fclose_ FILE *f = NULL; _cleanup_close_ int fd = -1; 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_image(marker, name_or_path); if (ret_marker) *ret_marker = TAKE_PTR(marker); return r; } int portable_detach( sd_bus *bus, const char *name_or_path, 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_closedir_ DIR *d = NULL; const char *where, *item; struct dirent *de; int ret = 0; int r; assert(name_or_path); r = lookup_paths_init(&paths, UNIT_FILE_SYSTEM, LOOKUP_PATHS_SPLIT_USR, 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; 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; dirent_ensure_type(d, de); if (!IN_SET(de->d_type, DT_LNK, DT_REG)) continue; r = test_chroot_dropin(d, where, de->d_name, name_or_path, &marker); if (r < 0) return r; if (r == 0) continue; r = unit_file_lookup_state(UNIT_FILE_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_RUNTIME, UNIT_FILE_LINKED_RUNTIME)) return sd_bus_error_setf(error, BUS_ERROR_UNIT_EXISTS, "Unit file '%s' is in state '%s', can't detach.", de->d_name, unit_file_state_to_string(state)); r = unit_file_is_active(bus, de->d_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.", de->d_name); 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); if (path_is_absolute(marker) && !image_in_search_path(IMAGE_PORTABLE, marker)) { r = set_ensure_consume(&markers, &path_hash_ops_free, TAKE_PTR(marker)); if (r < 0) return r; } } if (set_isempty(unit_files)) goto not_found; SET_FOREACH(item, unit_files) { _cleanup_free_ char *md = NULL; const char *suffix; 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: log_debug("No unit files associated with '%s' found. Image not attached?", name_or_path); return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_UNIT, "No unit files associated with '%s' found. Image not attached?", name_or_path); } static int portable_get_state_internal( sd_bus *bus, const char *name_or_path, 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; struct dirent *de; int r; assert(name_or_path); assert(ret); r = lookup_paths_init(&paths, UNIT_FILE_SYSTEM, LOOKUP_PATHS_SPLIT_USR, 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; dirent_ensure_type(d, de); if (!IN_SET(de->d_type, DT_LNK, DT_REG)) continue; r = test_chroot_dropin(d, where, de->d_name, name_or_path, NULL); if (r < 0) return r; if (r == 0) continue; r = unit_file_lookup_state(UNIT_FILE_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, 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, flags & ~PORTABLE_RUNTIME, &state, error); if (r < 0) return r; if (state == PORTABLE_DETACHED) { r = portable_get_state_internal(bus, name_or_path, 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, 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, PortableChangeType); 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);