return !!strchr(p, '/');
}
-char *path_get_file_name(const char *p) {
- char *r;
-
- assert(p);
-
- r = strrchr(p, '/');
- if (r)
- 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;
return path_make_absolute(p, cwd);
}
+int path_make_relative(const char *from_dir, const char *to_path, char **_r) {
+ char *r, *p;
+ unsigned n_parents;
+ size_t to_path_len;
+
+ 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;
+
+ *_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++;
+ }
+
+ to_path_len = strlen(to_path);
+
+ r = malloc(n_parents * 3 + to_path_len);
+ if (!r)
+ return -ENOMEM;
+
+ for (p = r; n_parents > 0; n_parents--, p += 3)
+ memcpy(p, "../", 3);
+
+ if (to_path_len > 0)
+ memcpy(p, to_path, to_path_len);
+ else
+ /* "to_path" is a parent directory of "from_dir". Let's remove
+ * the redundant slash from the end of the result. */
+ *(p - 1) = 0;
+
+ *_r = r;
+ return 0;
+}
+
char **path_strv_make_absolute_cwd(char **l) {
char **s;
return l;
}
-char **path_strv_canonicalize(char **l) {
+char **path_strv_canonicalize_absolute(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);
- *s = NULL;
-
- 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);
if (!u) {
- if (errno == ENOENT)
- u = t;
- else {
+ if (errno == ENOENT) {
+ if (prefix) {
+ u = orig;
+ orig = NULL;
+ free(t);
+ } else
+ u = t;
+ } else {
free(t);
- if (errno == ENOMEM || !errno)
+ 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 */
+ u = orig;
+ orig = NULL;
+ }
} else
free(t);
return l;
}
-char **path_strv_canonicalize_uniq(char **l) {
+char **path_strv_canonicalize_absolute_uniq(char **l, const char *prefix) {
+
if (strv_isempty(l))
return l;
- if (!path_strv_canonicalize(l))
+ if (!path_strv_canonicalize_absolute(l, prefix))
return NULL;
return strv_uniq(l);
}
int path_is_mount_point(const char *t, bool allow_symlink) {
- char *parent;
- int r;
- struct file_handle *h;
+
+ union file_handle_union h = {
+ .handle.handle_bytes = MAX_HANDLE_SZ
+ };
+
int mount_id, mount_id_parent;
+ char *parent;
struct stat a, b;
+ int r;
/* 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 (IN_SET(errno, ENOSYS, EOPNOTSUPP))
/* This kernel or file system does not support
* name_to_handle_at(), hence fallback to the
* traditional stat() logic */
if (r < 0)
return r;
- h->handle_bytes = MAX_HANDLE_SZ;
- r = name_to_handle_at(AT_FDCWD, parent, h, &mount_id_parent, 0);
+ h.handle.handle_bytes = MAX_HANDLE_SZ;
+ r = name_to_handle_at(AT_FDCWD, parent, &h.handle, &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)
+ if (errno == EOPNOTSUPP)
return 1;
return -errno;
r = lstat(parent, &b);
free(parent);
-
if (r < 0)
return -errno;
return r < 0 ? 0 : 1;
}
+
+int find_binary(const char *name, char **filename) {
+ assert(name);
+
+ if (strchr(name, '/')) {
+ if (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;
+ char *state, *w;
+ 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(w, l, path, ":", state) {
+ _cleanup_free_ char *p = NULL;
+
+ if (asprintf(&p, "%.*s/%s", (int) l, w, 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) {
+ const char *checker;
+
+ checker = strappenda("fsck.", fstype);
+ return find_binary(checker, NULL);
+}