return !!strchr(p, '/');
}
-char *path_get_file_name(const char *p) {
- char *r;
-
- assert(p);
-
- if ((r = strrchr(p, '/')))
- return r + 1;
-
- return (char*) p;
-}
-
int path_get_parent(const char *path, char **_r) {
const char *e, *a = NULL, *b = NULL, *p;
char *r;
char **l;
assert(p);
- if (!(l = strv_split(p, ":")))
+ l = strv_split(p, ":");
+ if (!l)
return NULL;
if (!path_strv_make_absolute_cwd(l)) {
}
char *path_make_absolute_cwd(const char *p) {
- char *cwd, *r;
+ _cleanup_free_ char *cwd = NULL;
assert(p);
if (path_is_absolute(p))
return strdup(p);
- if (!(cwd = get_current_dir_name()))
+ cwd = get_current_dir_name();
+ if (!cwd)
return NULL;
- r = path_make_absolute(p, cwd);
- free(cwd);
+ return strjoin(cwd, "/", p, NULL);
+}
+
+int path_make_relative(const char *from_dir, const char *to_path, char **_r) {
+ char *r, *p;
+ unsigned n_parents;
+
+ assert(from_dir);
+ assert(to_path);
+ assert(_r);
+
+ /* Strips the common part, and adds ".." elements as necessary. */
+
+ if (!path_is_absolute(from_dir))
+ return -EINVAL;
+
+ if (!path_is_absolute(to_path))
+ return -EINVAL;
+
+ /* Skip the common part. */
+ for (;;) {
+ size_t a;
+ size_t b;
+
+ from_dir += strspn(from_dir, "/");
+ to_path += strspn(to_path, "/");
+
+ if (!*from_dir) {
+ if (!*to_path)
+ /* from_dir equals to_path. */
+ r = strdup(".");
+ else
+ /* from_dir is a parent directory of to_path. */
+ r = strdup(to_path);
+
+ if (!r)
+ return -ENOMEM;
+
+ path_kill_slashes(r);
+
+ *_r = r;
+ return 0;
+ }
+
+ if (!*to_path)
+ break;
+
+ a = strcspn(from_dir, "/");
+ b = strcspn(to_path, "/");
+
+ if (a != b)
+ break;
+
+ if (memcmp(from_dir, to_path, a) != 0)
+ break;
+
+ from_dir += a;
+ to_path += b;
+ }
+
+ /* If we're here, then "from_dir" has one or more elements that need to
+ * be replaced with "..". */
+
+ /* Count the number of necessary ".." elements. */
+ for (n_parents = 0;;) {
+ from_dir += strspn(from_dir, "/");
+
+ if (!*from_dir)
+ break;
+
+ from_dir += strcspn(from_dir, "/");
+ n_parents++;
+ }
+
+ r = malloc(n_parents * 3 + strlen(to_path) + 1);
+ if (!r)
+ return -ENOMEM;
+
+ for (p = r; n_parents > 0; n_parents--, p += 3)
+ memcpy(p, "../", 3);
+
+ strcpy(p, to_path);
+ path_kill_slashes(r);
- return r;
+ *_r = r;
+ return 0;
}
char **path_strv_make_absolute_cwd(char **l) {
STRV_FOREACH(s, l) {
char *t;
- if (!(t = path_make_absolute_cwd(*s)))
+ t = path_make_absolute_cwd(*s);
+ if (!t)
return NULL;
free(*s);
return l;
}
-char **path_strv_canonicalize(char **l) {
+char **path_strv_resolve(char **l, const char *prefix) {
char **s;
unsigned k = 0;
bool enomem = false;
STRV_FOREACH(s, l) {
char *t, *u;
+ _cleanup_free_ char *orig = NULL;
- t = path_make_absolute_cwd(*s);
- free(*s);
-
- if (!t) {
- enomem = true;
+ if (!path_is_absolute(*s)) {
+ free(*s);
continue;
}
+ if (prefix) {
+ orig = *s;
+ t = strappend(prefix, orig);
+ if (!t) {
+ enomem = true;
+ continue;
+ }
+ } else
+ t = *s;
+
errno = 0;
u = canonicalize_file_name(t);
- free(t);
-
if (!u) {
- if (errno == ENOMEM || !errno)
- enomem = true;
-
- continue;
- }
+ if (errno == ENOENT) {
+ if (prefix) {
+ u = orig;
+ orig = NULL;
+ free(t);
+ } else
+ u = t;
+ } else {
+ free(t);
+ if (errno == ENOMEM || errno == 0)
+ enomem = true;
+
+ continue;
+ }
+ } else if (prefix) {
+ char *x;
+
+ free(t);
+ x = path_startswith(u, prefix);
+ if (x) {
+ /* restore the slash if it was lost */
+ if (!startswith(x, "/"))
+ *(--x) = '/';
+
+ t = strdup(x);
+ free(u);
+ if (!t) {
+ enomem = true;
+ continue;
+ }
+ u = t;
+ } else {
+ /* canonicalized path goes outside of
+ * prefix, keep the original path instead */
+ free(u);
+ u = orig;
+ orig = NULL;
+ }
+ } else
+ free(t);
l[k++] = u;
}
return l;
}
-char **path_strv_remove_empty(char **l) {
- char **f, **t;
-
- if (!l)
- return NULL;
-
- for (f = t = l; *f; f++) {
+char **path_strv_resolve_uniq(char **l, const char *prefix) {
- if (dir_is_empty(*f) > 0) {
- free(*f);
- continue;
- }
+ if (strv_isempty(l))
+ return l;
- *(t++) = *f;
- }
+ if (!path_strv_resolve(l, prefix))
+ return NULL;
- *t = NULL;
- return l;
+ return strv_uniq(l);
}
char *path_kill_slashes(char *path) {
}
}
+char* path_join(const char *root, const char *path, const char *rest) {
+ assert(path);
+
+ if (!isempty(root))
+ return strjoin(root, endswith(root, "/") ? "" : "/",
+ path[0] == '/' ? path+1 : path,
+ rest ? (endswith(path, "/") ? "" : "/") : NULL,
+ rest && rest[0] == '/' ? rest+1 : rest,
+ NULL);
+ else
+ return strjoin(path,
+ rest ? (endswith(path, "/") ? "" : "/") : NULL,
+ rest && rest[0] == '/' ? rest+1 : rest,
+ NULL);
+}
+
int path_is_mount_point(const char *t, bool allow_symlink) {
- char *parent;
- int r;
- struct file_handle *h;
- int mount_id, mount_id_parent;
+
+ union file_handle_union h = FILE_HANDLE_INIT;
+ int mount_id = -1, mount_id_parent = -1;
+ _cleanup_free_ char *parent = NULL;
struct stat a, b;
+ int r;
+ bool nosupp = false;
/* We are not actually interested in the file handles, but
* name_to_handle_at() also passes us the mount ID, hence use
if (path_equal(t, "/"))
return 1;
- h = alloca(MAX_HANDLE_SZ);
- h->handle_bytes = MAX_HANDLE_SZ;
-
- r = name_to_handle_at(AT_FDCWD, t, h, &mount_id, allow_symlink ? AT_SYMLINK_FOLLOW : 0);
+ r = name_to_handle_at(AT_FDCWD, t, &h.handle, &mount_id, allow_symlink ? AT_SYMLINK_FOLLOW : 0);
if (r < 0) {
- if (errno == ENOSYS || errno == ENOTSUP)
+ if (errno == ENOSYS)
+ /* This kernel does not support name_to_handle_at()
+ * fall back to the traditional stat() logic. */
+ goto fallback;
+ else if (errno == EOPNOTSUPP)
/* This kernel or file system does not support
* name_to_handle_at(), hence fallback to the
* traditional stat() logic */
- goto fallback;
-
- if (errno == ENOENT)
+ nosupp = true;
+ else if (errno == ENOENT)
return 0;
-
- return -errno;
+ else
+ return -errno;
}
r = path_get_parent(t, &parent);
if (r < 0)
return r;
- h->handle_bytes = MAX_HANDLE_SZ;
- r = name_to_handle_at(AT_FDCWD, parent, h, &mount_id_parent, 0);
- free(parent);
-
- if (r < 0) {
- /* The parent can't do name_to_handle_at() but the
- * directory we are interested in can? If so, it must
- * be a mount point */
- if (errno == ENOTSUP)
- return 1;
-
- return -errno;
- }
-
- return mount_id != mount_id_parent;
+ h.handle.handle_bytes = MAX_HANDLE_SZ;
+ r = name_to_handle_at(AT_FDCWD, parent, &h.handle, &mount_id_parent, AT_SYMLINK_FOLLOW);
+ if (r < 0)
+ if (errno == EOPNOTSUPP)
+ if (nosupp)
+ /* Neither parent nor child do name_to_handle_at()?
+ We have no choice but to fall back. */
+ goto fallback;
+ else
+ /* The parent can't do name_to_handle_at() but
+ * the directory we are interested in can?
+ * Or the other way around?
+ * If so, it must be a mount point. */
+ return 1;
+ else
+ return -errno;
+ else
+ return mount_id != mount_id_parent;
fallback:
if (allow_symlink)
return -errno;
}
+ free(parent);
+ parent = NULL;
+
r = path_get_parent(t, &parent);
if (r < 0)
return r;
- r = lstat(parent, &b);
- free(parent);
-
+ r = stat(parent, &b);
if (r < 0)
return -errno;
if (statvfs(path, &st) < 0)
return -errno;
- return !!(st.f_flag & ST_RDONLY);
+ if (st.f_flag & ST_RDONLY)
+ return true;
+
+ /* On NFS, statvfs() might not reflect whether we can actually
+ * write to the remote share. Let's try again with
+ * access(W_OK) which is more reliable, at least sometimes. */
+ if (access(path, W_OK) < 0 && errno == EROFS)
+ return true;
+
+ return false;
+}
+
+int path_is_os_tree(const char *path) {
+ char *p;
+ int r;
+
+ /* We use /usr/lib/os-release as flag file if something is an OS */
+ p = strappenda(path, "/usr/lib/os-release");
+ r = access(p, F_OK);
+
+ if (r >= 0)
+ return 1;
+
+ /* Also check for the old location in /etc, just in case. */
+ p = strappenda(path, "/etc/os-release");
+ r = access(p, F_OK);
+
+ return r >= 0;
+}
+
+int find_binary(const char *name, bool local, char **filename) {
+ assert(name);
+
+ if (is_path(name)) {
+ if (local && access(name, X_OK) < 0)
+ return -errno;
+
+ if (filename) {
+ char *p;
+
+ p = path_make_absolute_cwd(name);
+ if (!p)
+ return -ENOMEM;
+
+ *filename = p;
+ }
+
+ return 0;
+ } else {
+ const char *path;
+ const char *word, *state;
+ size_t l;
+
+ /**
+ * Plain getenv, not secure_getenv, because we want
+ * to actually allow the user to pick the binary.
+ */
+ path = getenv("PATH");
+ if (!path)
+ path = DEFAULT_PATH;
+
+ FOREACH_WORD_SEPARATOR(word, l, path, ":", state) {
+ _cleanup_free_ char *p = NULL;
+
+ if (asprintf(&p, "%.*s/%s", (int) l, word, name) < 0)
+ return -ENOMEM;
+
+ if (access(p, X_OK) < 0)
+ continue;
+
+ if (filename) {
+ *filename = path_kill_slashes(p);
+ p = NULL;
+ }
+
+ return 0;
+ }
+
+ return -ENOENT;
+ }
+}
+
+bool paths_check_timestamp(const char* const* paths, usec_t *timestamp, bool update) {
+ bool changed = false;
+ const char* const* i;
+
+ assert(timestamp);
+
+ if (paths == NULL)
+ return false;
+
+ STRV_FOREACH(i, paths) {
+ struct stat stats;
+ usec_t u;
+
+ if (stat(*i, &stats) < 0)
+ continue;
+
+ u = timespec_load(&stats.st_mtim);
+
+ /* first check */
+ if (*timestamp >= u)
+ continue;
+
+ log_debug("timestamp of '%s' changed", *i);
+
+ /* update timestamp */
+ if (update) {
+ *timestamp = u;
+ changed = true;
+ } else
+ return true;
+ }
+
+ return changed;
+}
+
+int fsck_exists(const char *fstype) {
+ _cleanup_free_ char *p = NULL, *d = NULL;
+ const char *checker;
+ int r;
+
+ checker = strappenda("fsck.", fstype);
+
+ r = find_binary(checker, true, &p);
+ if (r < 0)
+ return r;
+
+ /* An fsck that is linked to /bin/true is a non-existent
+ * fsck */
+
+ r = readlink_malloc(p, &d);
+ if (r >= 0 &&
+ (path_equal(d, "/bin/true") ||
+ path_equal(d, "/usr/bin/true") ||
+ path_equal(d, "/dev/null")))
+ return -ENOENT;
+
+ return 0;
}
~ianmdlvl / elogind.git / blobdiff