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-rw-r--r--src/basic/mkdir.c166
1 files changed, 166 insertions, 0 deletions
diff --git a/src/basic/mkdir.c b/src/basic/mkdir.c
new file mode 100644
index 0000000..4bb65d5
--- /dev/null
+++ b/src/basic/mkdir.c
@@ -0,0 +1,166 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include <errno.h>
+#include <stdbool.h>
+#include <string.h>
+#include <sys/stat.h>
+
+#include "alloc-util.h"
+#include "fs-util.h"
+#include "macro.h"
+#include "mkdir.h"
+#include "path-util.h"
+#include "stat-util.h"
+#include "stdio-util.h"
+#include "user-util.h"
+
+int mkdir_safe_internal(const char *path, mode_t mode, uid_t uid, gid_t gid, MkdirFlags flags, mkdir_func_t _mkdir) {
+ struct stat st;
+ int r;
+
+ assert(_mkdir != mkdir);
+
+ if (_mkdir(path, mode) >= 0) {
+ r = chmod_and_chown(path, mode, uid, gid);
+ if (r < 0)
+ return r;
+ }
+
+ if (lstat(path, &st) < 0)
+ return -errno;
+
+ if ((flags & MKDIR_FOLLOW_SYMLINK) && S_ISLNK(st.st_mode)) {
+ _cleanup_free_ char *p = NULL;
+
+ r = chase_symlinks(path, NULL, CHASE_NONEXISTENT, &p);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ return mkdir_safe_internal(p, mode, uid, gid,
+ flags & ~MKDIR_FOLLOW_SYMLINK,
+ _mkdir);
+
+ if (lstat(p, &st) < 0)
+ return -errno;
+ }
+
+ if (!S_ISDIR(st.st_mode)) {
+ log_full(flags & MKDIR_WARN_MODE ? LOG_WARNING : LOG_DEBUG,
+ "Path \"%s\" already exists and is not a directory, refusing.", path);
+ return -ENOTDIR;
+ }
+ if ((st.st_mode & 0007) > (mode & 0007) ||
+ (st.st_mode & 0070) > (mode & 0070) ||
+ (st.st_mode & 0700) > (mode & 0700)) {
+ log_full(flags & MKDIR_WARN_MODE ? LOG_WARNING : LOG_DEBUG,
+ "Directory \"%s\" already exists, but has mode %04o that is too permissive (%04o was requested), refusing.",
+ path, st.st_mode & 0777, mode);
+ return -EEXIST;
+ }
+ if ((uid != UID_INVALID && st.st_uid != uid) ||
+ (gid != GID_INVALID && st.st_gid != gid)) {
+ char u[DECIMAL_STR_MAX(uid_t)] = "-", g[DECIMAL_STR_MAX(gid_t)] = "-";
+
+ if (uid != UID_INVALID)
+ xsprintf(u, UID_FMT, uid);
+ if (gid != UID_INVALID)
+ xsprintf(g, GID_FMT, gid);
+ log_full(flags & MKDIR_WARN_MODE ? LOG_WARNING : LOG_DEBUG,
+ "Directory \"%s\" already exists, but is owned by "UID_FMT":"GID_FMT" (%s:%s was requested), refusing.",
+ path, st.st_uid, st.st_gid, u, g);
+ return -EEXIST;
+ }
+
+ return 0;
+}
+
+int mkdir_errno_wrapper(const char *pathname, mode_t mode) {
+ if (mkdir(pathname, mode) < 0)
+ return -errno;
+ return 0;
+}
+
+int mkdirat_errno_wrapper(int dirfd, const char *pathname, mode_t mode) {
+ if (mkdirat(dirfd, pathname, mode) < 0)
+ return -errno;
+ return 0;
+}
+
+int mkdir_safe(const char *path, mode_t mode, uid_t uid, gid_t gid, MkdirFlags flags) {
+ return mkdir_safe_internal(path, mode, uid, gid, flags, mkdir_errno_wrapper);
+}
+
+int mkdir_parents_internal(const char *prefix, const char *path, mode_t mode, mkdir_func_t _mkdir) {
+ const char *p, *e;
+ int r;
+
+ assert(path);
+ assert(_mkdir != mkdir);
+
+ if (prefix && !path_startswith(path, prefix))
+ return -ENOTDIR;
+
+ /* return immediately if directory exists */
+ e = strrchr(path, '/');
+ if (!e)
+ return -EINVAL;
+
+ if (e == path)
+ return 0;
+
+ p = strndupa(path, e - path);
+ r = is_dir(p, true);
+ if (r > 0)
+ return 0;
+ if (r == 0)
+ return -ENOTDIR;
+
+ /* create every parent directory in the path, except the last component */
+ p = path + strspn(path, "/");
+ for (;;) {
+ char t[strlen(path) + 1];
+
+ e = p + strcspn(p, "/");
+ p = e + strspn(e, "/");
+
+ /* Is this the last component? If so, then we're done */
+ if (*p == 0)
+ return 0;
+
+ memcpy(t, path, e - path);
+ t[e-path] = 0;
+
+ if (prefix && path_startswith(prefix, t))
+ continue;
+
+ r = _mkdir(t, mode);
+ if (r < 0 && r != -EEXIST)
+ return r;
+ }
+}
+
+int mkdir_parents(const char *path, mode_t mode) {
+ return mkdir_parents_internal(NULL, path, mode, mkdir_errno_wrapper);
+}
+
+int mkdir_p_internal(const char *prefix, const char *path, mode_t mode, mkdir_func_t _mkdir) {
+ int r;
+
+ /* Like mkdir -p */
+
+ assert(_mkdir != mkdir);
+
+ r = mkdir_parents_internal(prefix, path, mode, _mkdir);
+ if (r < 0)
+ return r;
+
+ r = _mkdir(path, mode);
+ if (r < 0 && (r != -EEXIST || is_dir(path, true) <= 0))
+ return r;
+
+ return 0;
+}
+
+int mkdir_p(const char *path, mode_t mode) {
+ return mkdir_p_internal(NULL, path, mode, mkdir_errno_wrapper);
+}