1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2010-2012 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
31 #include <sys/statvfs.h>
37 #include "path-util.h"
40 bool path_is_absolute(const char *p) {
44 bool is_path(const char *p) {
45 return !!strchr(p, '/');
48 int path_get_parent(const char *path, char **_r) {
49 const char *e, *a = NULL, *b = NULL, *p;
59 for (e = path; *e; e++) {
61 if (!slash && *e == '/') {
65 } else if (slash && *e != '/')
80 r = strndup(path, p-path);
89 char **path_split_and_make_absolute(const char *p) {
93 l = strv_split(p, ":");
97 if (!path_strv_make_absolute_cwd(l)) {
105 char *path_make_absolute(const char *p, const char *prefix) {
108 /* Makes every item in the list an absolute path by prepending
109 * the prefix, if specified and necessary */
111 if (path_is_absolute(p) || !prefix)
114 return strjoin(prefix, "/", p, NULL);
117 char *path_make_absolute_cwd(const char *p) {
118 _cleanup_free_ char *cwd = NULL;
122 /* Similar to path_make_absolute(), but prefixes with the
123 * current working directory. */
125 if (path_is_absolute(p))
128 cwd = get_current_dir_name();
132 return path_make_absolute(p, cwd);
135 char **path_strv_make_absolute_cwd(char **l) {
138 /* Goes through every item in the string list and makes it
139 * absolute. This works in place and won't rollback any
140 * changes on failure. */
145 t = path_make_absolute_cwd(*s);
156 char **path_strv_canonicalize(char **l) {
164 /* Goes through every item in the string list and canonicalize
165 * the path. This works in place and won't rollback any
166 * changes on failure. */
171 t = path_make_absolute_cwd(*s);
181 u = canonicalize_file_name(t);
187 if (errno == ENOMEM || !errno)
206 char **path_strv_canonicalize_uniq(char **l) {
210 if (!path_strv_canonicalize(l))
216 char *path_kill_slashes(char *path) {
220 /* Removes redundant inner and trailing slashes. Modifies the
221 * passed string in-place.
223 * ///foo///bar/ becomes /foo/bar
226 for (f = path, t = path; *f; f++) {
241 /* Special rule, if we are talking of the root directory, a
242 trailing slash is good */
244 if (t == path && slash)
251 char* path_startswith(const char *path, const char *prefix) {
255 if ((path[0] == '/') != (prefix[0] == '/'))
261 path += strspn(path, "/");
262 prefix += strspn(prefix, "/");
270 a = strcspn(path, "/");
271 b = strcspn(prefix, "/");
276 if (memcmp(path, prefix, a) != 0)
284 bool path_equal(const char *a, const char *b) {
288 if ((a[0] == '/') != (b[0] == '/'))
297 if (*a == 0 && *b == 0)
300 if (*a == 0 || *b == 0)
309 if (memcmp(a, b, j) != 0)
317 int path_is_mount_point(const char *t, bool allow_symlink) {
320 struct file_handle *h;
321 int mount_id, mount_id_parent;
324 /* We are not actually interested in the file handles, but
325 * name_to_handle_at() also passes us the mount ID, hence use
326 * it but throw the handle away */
328 if (path_equal(t, "/"))
331 h = alloca(MAX_HANDLE_SZ);
332 h->handle_bytes = MAX_HANDLE_SZ;
334 r = name_to_handle_at(AT_FDCWD, t, h, &mount_id, allow_symlink ? AT_SYMLINK_FOLLOW : 0);
336 if (errno == ENOSYS || errno == ENOTSUP)
337 /* This kernel or file system does not support
338 * name_to_handle_at(), hence fallback to the
339 * traditional stat() logic */
348 r = path_get_parent(t, &parent);
352 h->handle_bytes = MAX_HANDLE_SZ;
353 r = name_to_handle_at(AT_FDCWD, parent, h, &mount_id_parent, 0);
357 /* The parent can't do name_to_handle_at() but the
358 * directory we are interested in can? If so, it must
359 * be a mount point */
360 if (errno == ENOTSUP)
366 return mount_id != mount_id_parent;
381 r = path_get_parent(t, &parent);
385 r = lstat(parent, &b);
391 return a.st_dev != b.st_dev;
394 int path_is_read_only_fs(const char *path) {
399 if (statvfs(path, &st) < 0)
402 return !!(st.f_flag & ST_RDONLY);
405 int path_is_os_tree(const char *path) {
409 /* We use /etc/os-release as flag file if something is an OS */
411 p = strappenda(path, "/etc/os-release");
414 return r < 0 ? 0 : 1;
417 int find_binary(const char *name, char **filename) {
421 if (strchr(name, '/')) {
424 if (path_is_absolute(name))
427 p = path_make_absolute_cwd(name);
439 * Plain getenv, not secure_getenv, because we want
440 * to actually allow the user to pick the binary.
442 path = getenv("PATH");
446 FOREACH_WORD_SEPARATOR(w, l, path, ":", state) {
449 if (asprintf(&p, "%.*s/%s", (int) l, w, name) < 0)
452 if (access(p, X_OK) < 0) {
457 path_kill_slashes(p);
467 bool paths_check_timestamp(char **paths, usec_t *timestamp, bool update) {
468 bool changed = false;
476 STRV_FOREACH(i, paths) {
480 if (stat(*i, &stats) < 0)
483 u = timespec_load(&stats.st_mtim);
489 log_debug("timestamp of '%s' changed\n", *i);
491 /* update timestamp */