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Systemd/src/portable/portable.c

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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <linux/loop.h>
#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);
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