--- /dev/null
+/*
+ * Deletion routines used in rsync.
+ *
+ * Copyright (C) 1996-2000 Andrew Tridgell
+ * Copyright (C) 1996 Paul Mackerras
+ * Copyright (C) 2002 Martin Pool <mbp@samba.org>
+ * Copyright (C) 2003-2009 Wayne Davison
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, visit the http://fsf.org website.
+ */
+
+#include "rsync.h"
+
+extern int am_root;
+extern int make_backups;
+extern int max_delete;
+extern char *backup_dir;
+extern char *backup_suffix;
+extern int backup_suffix_len;
+extern uid_t our_uid;
+extern struct stats stats;
+
+int ignore_perishable = 0;
+int non_perishable_cnt = 0;
+int skipped_deletes = 0;
+
+static inline int is_backup_file(char *fn)
+{
+ int k = strlen(fn) - backup_suffix_len;
+ return k > 0 && strcmp(fn+k, backup_suffix) == 0;
+}
+
+/* The directory is about to be deleted: if DEL_RECURSE is given, delete all
+ * its contents, otherwise just checks for content. Returns DR_SUCCESS or
+ * DR_NOT_EMPTY. Note that fname must point to a MAXPATHLEN buffer! (The
+ * buffer is used for recursion, but returned unchanged.)
+ */
+static enum delret delete_dir_contents(char *fname, uint16 flags)
+{
+ struct file_list *dirlist;
+ enum delret ret;
+ unsigned remainder;
+ void *save_filters;
+ int j, dlen;
+ char *p;
+
+ if (DEBUG_GTE(DEL, 3)) {
+ rprintf(FINFO, "delete_dir_contents(%s) flags=%d\n",
+ fname, flags);
+ }
+
+ dlen = strlen(fname);
+ save_filters = push_local_filters(fname, dlen);
+
+ non_perishable_cnt = 0;
+ dirlist = get_dirlist(fname, dlen, 0);
+ ret = non_perishable_cnt ? DR_NOT_EMPTY : DR_SUCCESS;
+
+ if (!dirlist->used)
+ goto done;
+
+ if (!(flags & DEL_RECURSE)) {
+ ret = DR_NOT_EMPTY;
+ goto done;
+ }
+
+ p = fname + dlen;
+ if (dlen != 1 || *fname != '/')
+ *p++ = '/';
+ remainder = MAXPATHLEN - (p - fname);
+
+ /* We do our own recursion, so make delete_item() non-recursive. */
+ flags = (flags & ~(DEL_RECURSE|DEL_MAKE_ROOM|DEL_NO_UID_WRITE))
+ | DEL_DIR_IS_EMPTY;
+
+ for (j = dirlist->used; j--; ) {
+ struct file_struct *fp = dirlist->files[j];
+
+ if (fp->flags & FLAG_MOUNT_DIR && S_ISDIR(fp->mode)) {
+ if (DEBUG_GTE(DEL, 1)) {
+ rprintf(FINFO,
+ "mount point, %s, pins parent directory\n",
+ f_name(fp, NULL));
+ }
+ ret = DR_NOT_EMPTY;
+ continue;
+ }
+
+ strlcpy(p, fp->basename, remainder);
+ if (!(fp->mode & S_IWUSR) && !am_root && (uid_t)F_OWNER(fp) == our_uid)
+ do_chmod(fname, fp->mode | S_IWUSR);
+ /* Save stack by recursing to ourself directly. */
+ if (S_ISDIR(fp->mode)) {
+ if (delete_dir_contents(fname, flags | DEL_RECURSE) != DR_SUCCESS)
+ ret = DR_NOT_EMPTY;
+ }
+ if (delete_item(fname, fp->mode, flags) != DR_SUCCESS)
+ ret = DR_NOT_EMPTY;
+ }
+
+ fname[dlen] = '\0';
+
+ done:
+ flist_free(dirlist);
+ pop_local_filters(save_filters);
+
+ if (ret == DR_NOT_EMPTY) {
+ rprintf(FINFO, "cannot delete non-empty directory: %s\n",
+ fname);
+ }
+ return ret;
+}
+
+/* Delete a file or directory. If DEL_RECURSE is set in the flags, this will
+ * delete recursively.
+ *
+ * Note that fbuf must point to a MAXPATHLEN buffer if the mode indicates it's
+ * a directory! (The buffer is used for recursion, but returned unchanged.)
+ */
+enum delret delete_item(char *fbuf, uint16 mode, uint16 flags)
+{
+ enum delret ret;
+ char *what;
+ int ok;
+
+ if (DEBUG_GTE(DEL, 2)) {
+ rprintf(FINFO, "delete_item(%s) mode=%o flags=%d\n",
+ fbuf, (int)mode, (int)flags);
+ }
+
+ if (flags & DEL_NO_UID_WRITE)
+ do_chmod(fbuf, mode | S_IWUSR);
+
+ if (S_ISDIR(mode) && !(flags & DEL_DIR_IS_EMPTY)) {
+ int save_uid_ndx = uid_ndx;
+ /* This only happens on the first call to delete_item() since
+ * delete_dir_contents() always calls us w/DEL_DIR_IS_EMPTY. */
+ if (!uid_ndx)
+ uid_ndx = ++file_extra_cnt;
+ ignore_perishable = 1;
+ /* If DEL_RECURSE is not set, this just reports emptiness. */
+ ret = delete_dir_contents(fbuf, flags);
+ ignore_perishable = 0;
+ if (!save_uid_ndx) {
+ --file_extra_cnt;
+ uid_ndx = 0;
+ }
+ if (ret == DR_NOT_EMPTY || ret == DR_AT_LIMIT)
+ goto check_ret;
+ /* OK: try to delete the directory. */
+ }
+
+ if (!(flags & DEL_MAKE_ROOM) && max_delete >= 0 && stats.deleted_files >= max_delete) {
+ skipped_deletes++;
+ return DR_AT_LIMIT;
+ }
+
+ if (S_ISDIR(mode)) {
+ what = "rmdir";
+ ok = do_rmdir(fbuf) == 0;
+ } else if (make_backups > 0 && (backup_dir || !is_backup_file(fbuf))) {
+ what = "make_backup";
+ ok = make_backup(fbuf);
+ } else {
+ what = "unlink";
+ ok = robust_unlink(fbuf) == 0;
+ }
+
+ if (ok) {
+ if (!(flags & DEL_MAKE_ROOM)) {
+ log_delete(fbuf, mode);
+ stats.deleted_files++;
+ if (S_ISREG(mode)) {
+ /* Nothing more to count */
+ } else if (S_ISDIR(mode))
+ stats.deleted_dirs++;
+#ifdef SUPPORT_LINKS
+ else if (S_ISLNK(mode))
+ stats.deleted_symlinks++;
+#endif
+ else if (IS_DEVICE(mode))
+ stats.deleted_symlinks++;
+ else
+ stats.deleted_specials++;
+ }
+ ret = DR_SUCCESS;
+ } else {
+ if (S_ISDIR(mode) && errno == ENOTEMPTY) {
+ rprintf(FINFO, "cannot delete non-empty directory: %s\n",
+ fbuf);
+ ret = DR_NOT_EMPTY;
+ } else if (errno != ENOENT) {
+ rsyserr(FERROR, errno, "delete_file: %s(%s) failed",
+ what, fbuf);
+ ret = DR_FAILURE;
+ } else
+ ret = DR_SUCCESS;
+ }
+
+ check_ret:
+ if (ret != DR_SUCCESS && flags & DEL_MAKE_ROOM) {
+ const char *desc;
+ switch (flags & DEL_MAKE_ROOM) {
+ case DEL_FOR_FILE: desc = "regular file"; break;
+ case DEL_FOR_DIR: desc = "directory"; break;
+ case DEL_FOR_SYMLINK: desc = "symlink"; break;
+ case DEL_FOR_DEVICE: desc = "device file"; break;
+ case DEL_FOR_SPECIAL: desc = "special file"; break;
+ default: exit_cleanup(RERR_UNSUPPORTED); /* IMPOSSIBLE */
+ }
+ rprintf(FERROR_XFER, "could not make way for new %s: %s\n",
+ desc, fbuf);
+ }
+ return ret;
+}
Matt McCutchen's Web Site / rsync / rsync.git / blobdiff