New upstream version 4.15.1

lib/remove_tree.c

@@ -0,0 +1,101 @@
+/*
+ * SPDX-FileCopyrightText: 1991 - 1994, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 2001, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2003 - 2006, Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2007 - 2010, Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#ident "$Id$"
+
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <dirent.h>
+#include <unistd.h>
+#include "prototypes.h"
+#include "defines.h"
+
+static int remove_tree_at (int at_fd, const char *path, bool remove_root)
+{
+	DIR *dir;
+	const struct dirent *ent;
+	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 source directory and delete each entry.
+	 */
+	while ((ent = readdir (dir))) {
+		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)) {
+			/*
+			 * Recursively delete this directory.
+			 */
+			if (remove_tree_at (dirfd(dir), ent->d_name, true) != 0) {
+				rc = -1;
+				break;
+			}
+		} else {
+			/*
+			 * Delete the file.
+			 */
+			if (unlinkat (dirfd(dir), ent->d_name, 0) != 0) {
+				rc = -1;
+				break;
+			}
+		}
+	}
+
+	(void) closedir (dir);
+
+	if (remove_root && (0 == rc)) {
+		if (unlinkat (at_fd, path, AT_REMOVEDIR) != 0) {
+			rc = -1;
+		}
+	}
+
+	return rc;
+}
+
+/*
+ * remove_tree - delete a directory tree
+ *
+ *	remove_tree() walks a directory tree and deletes all the files
+ *	and directories.
+ *	At the end, it deletes the root directory itself.
+ */
+int remove_tree (const char *root, bool remove_root)
+{
+	return remove_tree_at (AT_FDCWD, root, remove_root);
+}