Merging upstream version 1:4.15.2.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 146 insertions, 0 deletions

diff --git a/lib/chowndir.c b/lib/chowndir.c
new file mode 100644
index 0000000..d31618a
--- /dev/null
+++ b/lib/chowndir.c
@@ -0,0 +1,146 @@
+/*
+ * SPDX-FileCopyrightText: 1992 - 1993, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 2000, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2003 - 2005, Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2010 -     , Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#ident "$Id$"
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include "prototypes.h"
+#include "defines.h"
+#include <fcntl.h>
+#include <stdio.h>
+#include <unistd.h>
+
+static int chown_tree_at (int at_fd,
+                const char *path,
+                uid_t old_uid,
+                uid_t new_uid,
+                gid_t old_gid,
+                gid_t new_gid)
+{
+	DIR *dir;
+	const struct dirent *ent;
+	struct stat dir_sb;
+	int dir_fd, rc = 0;
+
+	dir_fd = openat (at_fd, path, O_RDONLY | O_DIRECTORY | O_NOFOLLOW | O_CLOEXEC);
+	if (dir_fd < 0) {
+		return -1;
+	}
+
+	dir = fdopendir (dir_fd);
+	if (!dir) {
+		(void) close (dir_fd);
+		return -1;
+	}
+
+	/*
+	 * Open the directory and read each entry.  Every entry is tested
+	 * to see if it is a directory, and if so this routine is called
+	 * recursively.  If not, it is checked to see if an ownership
+	 * shall be changed.
+	 */
+	while ((ent = readdir (dir))) {
+		uid_t tmpuid = (uid_t) -1;
+		gid_t tmpgid = (gid_t) -1;
+		struct stat ent_sb;
+
+		/*
+		 * Skip the "." and ".." entries
+		 */
+		if (   (strcmp (ent->d_name, ".") == 0)
+		    || (strcmp (ent->d_name, "..") == 0)) {
+			continue;
+		}
+
+		rc = fstatat (dirfd(dir), ent->d_name, &ent_sb, AT_SYMLINK_NOFOLLOW);
+		if (rc < 0) {
+			break;
+		}
+
+		if (S_ISDIR (ent_sb.st_mode)) {
+			/*
+			 * Do the entire subdirectory.
+			 */
+			rc = chown_tree_at (dirfd(dir), ent->d_name, old_uid, new_uid, old_gid, new_gid);
+			if (0 != rc) {
+				break;
+			}
+		}
+
+		/*
+		 * By default, the IDs are not changed (-1).
+		 *
+		 * If the file is not owned by the user, the owner is not
+		 * changed.
+		 *
+		 * If the file is not group-owned by the group, the
+		 * group-owner is not changed.
+		 */
+		if (((uid_t) -1 == old_uid) || (ent_sb.st_uid == old_uid)) {
+			tmpuid = new_uid;
+		}
+		if (((gid_t) -1 == old_gid) || (ent_sb.st_gid == old_gid)) {
+			tmpgid = new_gid;
+		}
+		if (((uid_t) -1 != tmpuid) || ((gid_t) -1 != tmpgid)) {
+			rc = fchownat (dirfd(dir), ent->d_name, tmpuid, tmpgid, AT_SYMLINK_NOFOLLOW);
+			if (0 != rc) {
+				break;
+			}
+		}
+	}
+
+	/*
+	 * Now do the root of the tree
+	 */
+	if ((0 == rc) && (fstat (dirfd(dir), &dir_sb) == 0)) {
+		uid_t tmpuid = (uid_t) -1;
+		gid_t tmpgid = (gid_t) -1;
+		if (((uid_t) -1 == old_uid) || (dir_sb.st_uid == old_uid)) {
+			tmpuid = new_uid;
+		}
+		if (((gid_t) -1 == old_gid) || (dir_sb.st_gid == old_gid)) {
+			tmpgid = new_gid;
+		}
+		if (((uid_t) -1 != tmpuid) || ((gid_t) -1 != tmpgid)) {
+			rc = fchown (dirfd(dir), tmpuid, tmpgid);
+		}
+	} else {
+		rc = -1;
+	}
+
+	(void) closedir (dir);
+
+	return rc;
+}
+
+/*
+ * chown_tree - change ownership of files in a directory tree
+ *
+ *	chown_dir() walks a directory tree and changes the ownership
+ *	of all files owned by the provided user ID.
+ *
+ *	Only files owned (resp. group-owned) by old_uid (resp. by old_gid)
+ *	will have their ownership (resp. group-ownership) modified, unless
+ *	old_uid (resp. old_gid) is set to -1.
+ *
+ *	new_uid and new_gid can be set to -1 to indicate that no owner or
+ *	group-owner shall be changed.
+ */
+int chown_tree (const char *root,
+                uid_t old_uid,
+                uid_t new_uid,
+                gid_t old_gid,
+                gid_t new_gid)
+{
+	return chown_tree_at (AT_FDCWD, root, old_uid, new_uid, old_gid, new_gid);
+}