-/* SPDX-License-Identifier: LGPL-2.1+ */
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include "alloc-util.h"
+#include "chase-symlinks.h"
+#include "dirent-util.h"
+#include "env-file.h"
+#include "env-util.h"
#include "fd-util.h"
+#include "fileio.h"
#include "fs-util.h"
#include "macro.h"
#include "os-util.h"
-#include "strv.h"
-#include "fileio.h"
+#include "parse-util.h"
+#include "path-util.h"
+#include "stat-util.h"
#include "string-util.h"
+#include "strv.h"
+#include "utf8.h"
+#include "xattr-util.h"
+
+bool image_name_is_valid(const char *s) {
+ if (!filename_is_valid(s))
+ return false;
+
+ if (string_has_cc(s, NULL))
+ return false;
+
+ if (!utf8_is_valid(s))
+ return false;
+
+ /* Temporary files for atomically creating new files */
+ if (startswith(s, ".#"))
+ return false;
+
+ return true;
+}
-int path_is_os_tree(const char *path) {
+int path_is_extension_tree(const char *path, const char *extension) {
int r;
assert(path);
/* Does the path exist at all? If not, generate an error immediately. This is useful so that a missing root dir
- * always results in -ENOENT, and we can properly distuingish the case where the whole root doesn't exist from
+ * always results in -ENOENT, and we can properly distinguish the case where the whole root doesn't exist from
* the case where just the os-release file is missing. */
if (laccess(path, F_OK) < 0)
return -errno;
- /* We use {/etc|/usr/lib}/os-release as flag file if something is an OS */
- r = open_os_release(path, NULL, NULL);
+ /* We use /usr/lib/extension-release.d/extension-release[.NAME] as flag for something being a system extension,
+ * and {/etc|/usr/lib}/os-release as a flag for something being an OS (when not an extension). */
+ r = open_extension_release(path, extension, NULL, NULL);
if (r == -ENOENT) /* We got nothing */
return 0;
if (r < 0)
return 1;
}
-int open_os_release(const char *root, char **ret_path, int *ret_fd) {
+int open_extension_release(const char *root, const char *extension, char **ret_path, int *ret_fd) {
_cleanup_free_ char *q = NULL;
- const char *p;
- int k;
+ int r, fd;
+
+ if (extension) {
+ const char *extension_full_path;
+
+ if (!image_name_is_valid(extension))
+ return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
+ "The extension name %s is invalid.", extension);
+
+ extension_full_path = strjoina("/usr/lib/extension-release.d/extension-release.", extension);
+ r = chase_symlinks(extension_full_path, root, CHASE_PREFIX_ROOT,
+ ret_path ? &q : NULL,
+ ret_fd ? &fd : NULL);
+ log_full_errno_zerook(LOG_DEBUG, MIN(r, 0), "Checking for %s: %m", extension_full_path);
+
+ /* Cannot find the expected extension-release file? The image filename might have been
+ * mangled on deployment, so fallback to checking for any file in the extension-release.d
+ * directory, and return the first one with a user.extension-release xattr instead.
+ * The user.extension-release.strict xattr is checked to ensure the author of the image
+ * considers it OK if names do not match. */
+ if (r == -ENOENT) {
+ _cleanup_free_ char *extension_release_dir_path = NULL;
+ _cleanup_closedir_ DIR *extension_release_dir = NULL;
+
+ r = chase_symlinks_and_opendir("/usr/lib/extension-release.d/", root, CHASE_PREFIX_ROOT,
+ &extension_release_dir_path, &extension_release_dir);
+ if (r < 0)
+ return log_debug_errno(r, "Cannot open %s/usr/lib/extension-release.d/, ignoring: %m", root);
+
+ r = -ENOENT;
+ FOREACH_DIRENT(de, extension_release_dir, return -errno) {
+ int k;
+
+ if (!IN_SET(de->d_type, DT_REG, DT_UNKNOWN))
+ continue;
+
+ const char *image_name = startswith(de->d_name, "extension-release.");
+ if (!image_name)
+ continue;
- FOREACH_STRING(p, "/etc/os-release", "/usr/lib/os-release") {
- k = chase_symlinks(p, root, CHASE_PREFIX_ROOT|(ret_fd ? CHASE_OPEN : 0), (ret_path ? &q : NULL));
- if (k != -ENOENT)
- break;
+ if (!image_name_is_valid(image_name)) {
+ log_debug("%s/%s is not a valid extension-release file name, ignoring.",
+ extension_release_dir_path, de->d_name);
+ continue;
+ }
+
+ /* We already chased the directory, and checked that
+ * this is a real file, so we shouldn't fail to open it. */
+ _cleanup_close_ int extension_release_fd = openat(dirfd(extension_release_dir),
+ de->d_name,
+ O_PATH|O_CLOEXEC|O_NOFOLLOW);
+ if (extension_release_fd < 0)
+ return log_debug_errno(errno,
+ "Failed to open extension-release file %s/%s: %m",
+ extension_release_dir_path,
+ de->d_name);
+
+ /* Really ensure it is a regular file after we open it. */
+ if (fd_verify_regular(extension_release_fd) < 0) {
+ log_debug("%s/%s is not a regular file, ignoring.", extension_release_dir_path, de->d_name);
+ continue;
+ }
+
+ /* No xattr or cannot parse it? Then skip this. */
+ _cleanup_free_ char *extension_release_xattr = NULL;
+ k = fgetxattr_malloc(extension_release_fd, "user.extension-release.strict", &extension_release_xattr);
+ if (k < 0 && !ERRNO_IS_NOT_SUPPORTED(k) && k != -ENODATA)
+ log_debug_errno(k,
+ "%s/%s: Failed to read 'user.extension-release.strict' extended attribute from file: %m",
+ extension_release_dir_path, de->d_name);
+ if (k < 0) {
+ log_debug("%s/%s does not have user.extension-release.strict xattr, ignoring.", extension_release_dir_path, de->d_name);
+ continue;
+ }
+
+ /* Explicitly set to request strict matching? Skip it. */
+ k = parse_boolean(extension_release_xattr);
+ if (k < 0)
+ log_debug_errno(k,
+ "%s/%s: Failed to parse 'user.extension-release.strict' extended attribute from file: %m",
+ extension_release_dir_path, de->d_name);
+ else if (k > 0)
+ log_debug("%s/%s: 'user.extension-release.strict' attribute is true, ignoring file.",
+ extension_release_dir_path, de->d_name);
+ if (k != 0)
+ continue;
+
+ log_debug("%s/%s: 'user.extension-release.strict' attribute is false…",
+ extension_release_dir_path, de->d_name);
+
+ /* We already found what we were looking for, but there's another candidate?
+ * We treat this as an error, as we want to enforce that there are no ambiguities
+ * in case we are in the fallback path.*/
+ if (r == 0) {
+ r = -ENOTUNIQ;
+ break;
+ }
+
+ r = 0; /* Found it! */
+
+ if (ret_fd)
+ fd = TAKE_FD(extension_release_fd);
+
+ if (ret_path) {
+ q = path_join(extension_release_dir_path, de->d_name);
+ if (!q)
+ return -ENOMEM;
+ }
+ }
+ }
+ } else {
+ const char *p;
+
+ FOREACH_STRING(p, "/etc/os-release", "/usr/lib/os-release") {
+ r = chase_symlinks(p, root, CHASE_PREFIX_ROOT,
+ ret_path ? &q : NULL,
+ ret_fd ? &fd : NULL);
+ if (r != -ENOENT)
+ break;
+ }
}
- if (k < 0)
- return k;
+ if (r < 0)
+ return r;
if (ret_fd) {
int real_fd;
/* Convert the O_PATH fd into a proper, readable one */
- real_fd = fd_reopen(k, O_RDONLY|O_CLOEXEC|O_NOCTTY);
- safe_close(k);
+ real_fd = fd_reopen(fd, O_RDONLY|O_CLOEXEC|O_NOCTTY);
+ safe_close(fd);
if (real_fd < 0)
return real_fd;
return 0;
}
-int fopen_os_release(const char *root, char **ret_path, FILE **ret_file) {
+int fopen_extension_release(const char *root, const char *extension, char **ret_path, FILE **ret_file) {
_cleanup_free_ char *p = NULL;
_cleanup_close_ int fd = -1;
FILE *f;
int r;
if (!ret_file)
- return open_os_release(root, ret_path, NULL);
+ return open_extension_release(root, extension, ret_path, NULL);
- r = open_os_release(root, ret_path ? &p : NULL, &fd);
+ r = open_extension_release(root, extension, ret_path ? &p : NULL, &fd);
if (r < 0)
return r;
- f = fdopen(fd, "re");
+ f = take_fdopen(&fd, "r");
if (!f)
return -errno;
- fd = -1;
-
- *ret_file = f;
if (ret_path)
*ret_path = TAKE_PTR(p);
+ *ret_file = f;
return 0;
}
-int parse_os_release(const char *root, ...) {
+static int parse_release_internal(const char *root, const char *extension, va_list ap) {
_cleanup_fclose_ FILE *f = NULL;
_cleanup_free_ char *p = NULL;
- va_list ap;
int r;
- r = fopen_os_release(root, &p, &f);
+ r = fopen_extension_release(root, extension, &p, &f);
if (r < 0)
return r;
+ return parse_env_filev(f, p, ap);
+}
+
+int _parse_extension_release(const char *root, const char *extension, ...) {
+ va_list ap;
+ int r;
+
+ va_start(ap, extension);
+ r = parse_release_internal(root, extension, ap);
+ va_end(ap);
+
+ return r;
+}
+
+int _parse_os_release(const char *root, ...) {
+ va_list ap;
+ int r;
+
va_start(ap, root);
- r = parse_env_filev(f, p, ap);
+ r = parse_release_internal(root, NULL, ap);
va_end(ap);
return r;
return load_env_file_pairs(f, p, ret);
}
+
+int load_os_release_pairs_with_prefix(const char *root, const char *prefix, char ***ret) {
+ _cleanup_strv_free_ char **os_release_pairs = NULL, **os_release_pairs_prefixed = NULL;
+ char **p, **q;
+ int r;
+
+ r = load_os_release_pairs(root, &os_release_pairs);
+ if (r < 0)
+ return r;
+
+ STRV_FOREACH_PAIR(p, q, os_release_pairs) {
+ char *line;
+
+ /* We strictly return only the four main ID fields and ignore the rest */
+ if (!STR_IN_SET(*p, "ID", "VERSION_ID", "BUILD_ID", "VARIANT_ID"))
+ continue;
+
+ ascii_strlower(*p);
+ line = strjoin(prefix, *p, "=", *q);
+ if (!line)
+ return -ENOMEM;
+ r = strv_consume(&os_release_pairs_prefixed, line);
+ if (r < 0)
+ return r;
+ }
+
+ *ret = TAKE_PTR(os_release_pairs_prefixed);
+
+ return 0;
+}
+
+int load_extension_release_pairs(const char *root, const char *extension, char ***ret) {
+ _cleanup_fclose_ FILE *f = NULL;
+ _cleanup_free_ char *p = NULL;
+ int r;
+
+ r = fopen_extension_release(root, extension, &p, &f);
+ if (r < 0)
+ return r;
+
+ return load_env_file_pairs(f, p, ret);
+}
projects / thirdparty / systemd.git / blobdiff