2 * Backup handling code.
4 * Copyright (C) 1999 Andrew Tridgell
5 * Copyright (C) 2003-2008 Wayne Davison
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 3 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License along
18 * with this program; if not, visit the http://fsf.org website.
25 extern int preserve_acls;
26 extern int preserve_xattrs;
27 extern int preserve_devices;
28 extern int preserve_specials;
29 extern int preserve_links;
30 extern int safe_symlinks;
31 extern int backup_dir_len;
32 extern unsigned int backup_dir_remainder;
33 extern char backup_dir_buf[MAXPATHLEN];
34 extern char *backup_suffix;
35 extern char *backup_dir;
37 /* make a complete pathname for backup file */
38 char *get_backup_name(const char *fname)
41 if (stringjoin(backup_dir_buf + backup_dir_len, backup_dir_remainder,
42 fname, backup_suffix, NULL) < backup_dir_remainder)
43 return backup_dir_buf;
45 if (stringjoin(backup_dir_buf, MAXPATHLEN,
46 fname, backup_suffix, NULL) < MAXPATHLEN)
47 return backup_dir_buf;
50 rprintf(FERROR, "backup filename too long\n");
54 /* simple backup creates a backup with a suffix in the same directory */
55 static int make_simple_backup(const char *fname)
58 const char *fnamebak = get_backup_name(fname);
64 if (do_rename(fname, fnamebak) == 0) {
65 if (INFO_GTE(BACKUP, 1)) {
66 rprintf(FINFO, "backed up %s to %s\n",
71 /* cygwin (at least version b19) reports EINVAL */
72 if (errno == ENOENT || errno == EINVAL)
76 if (errno == EISDIR && do_rmdir(fnamebak) == 0)
78 if (errno == ENOTDIR && do_unlink(fnamebak) == 0)
81 rsyserr(FERROR, rename_errno, "rename %s to backup %s",
91 /****************************************************************************
92 Create a directory given an absolute path, perms based upon another directory
94 ****************************************************************************/
95 int make_bak_dir(const char *fullpath)
97 char fbuf[MAXPATHLEN], *rel, *end, *p;
98 struct file_struct *file;
99 int len = backup_dir_len;
102 while (*fullpath == '.' && fullpath[1] == '/') {
107 if (strlcpy(fbuf, fullpath, sizeof fbuf) >= sizeof fbuf)
111 end = p = rel + strlen(rel);
113 /* Try to find an existing dir, starting from the deepest dir. */
119 if (mkdir_defmode(fbuf) == 0)
121 if (errno != ENOENT) {
122 rsyserr(FERROR, errno,
123 "make_bak_dir mkdir %s failed",
130 /* Make all the dirs that we didn't find on the way here. */
133 /* Try to transfer the directory settings of the
134 * actual dir that the files are coming from. */
136 if (x_stat(rel, &sx.st, NULL) < 0) {
137 rsyserr(FERROR, errno,
138 "make_bak_dir stat %s failed",
141 if (!(file = make_file(rel, NULL, NULL, 0, NO_FILTERS)))
144 if (preserve_acls && !S_ISLNK(file->mode)) {
146 cache_acl(file, &sx);
150 #ifdef SUPPORT_XATTRS
151 if (preserve_xattrs) {
153 cache_xattr(file, &sx);
157 set_file_attrs(fbuf, file, NULL, NULL, 0);
165 if (mkdir_defmode(fbuf) < 0) {
166 rsyserr(FERROR, errno, "make_bak_dir mkdir %s failed",
175 /* robustly move a file, creating new directory structures if necessary */
176 static int robust_move(const char *src, char *dst)
178 if (robust_rename(src, dst, NULL, 0755) < 0) {
179 int save_errno = errno ? errno : EINVAL; /* 0 paranoia */
180 if (errno == ENOENT && make_bak_dir(dst) == 0) {
181 if (robust_rename(src, dst, NULL, 0755) < 0)
182 save_errno = errno ? errno : save_errno;
195 /* If we have a --backup-dir, then we get here from make_backup().
196 * We will move the file to be deleted into a parallel directory tree. */
197 static int keep_backup(const char *fname)
200 struct file_struct *file;
202 int save_preserve_xattrs = preserve_xattrs;
207 /* Return success if no file to keep. */
208 if (x_lstat(fname, &sx.st, NULL) < 0)
211 if (!(file = make_file(fname, NULL, NULL, 0, NO_FILTERS)))
212 return 1; /* the file could have disappeared */
214 if (!(buf = get_backup_name(fname))) {
220 if (preserve_acls && !S_ISLNK(file->mode)) {
222 cache_acl(file, &sx);
226 #ifdef SUPPORT_XATTRS
227 if (preserve_xattrs) {
228 get_xattr(fname, &sx);
229 cache_xattr(file, &sx);
234 /* Check to see if this is a device file, or link */
235 if ((am_root && preserve_devices && IS_DEVICE(file->mode))
236 || (preserve_specials && IS_SPECIAL(file->mode))) {
239 if (do_mknod(buf, file->mode, sx.st.st_rdev) < 0) {
240 save_errno = errno ? errno : EINVAL; /* 0 paranoia */
241 if (errno == ENOENT && make_bak_dir(buf) == 0) {
242 if (do_mknod(buf, file->mode, sx.st.st_rdev) < 0)
243 save_errno = errno ? errno : save_errno;
248 rsyserr(FERROR, save_errno, "mknod %s failed",
253 if (DEBUG_GTE(BACKUP, 1) && save_errno == 0) {
254 rprintf(FINFO, "make_backup: DEVICE %s successful.\n",
261 if (!kept && S_ISDIR(file->mode)) {
262 /* make an empty directory */
263 if (do_mkdir(buf, file->mode) < 0) {
264 int save_errno = errno ? errno : EINVAL; /* 0 paranoia */
265 if (errno == ENOENT && make_bak_dir(buf) == 0) {
266 if (do_mkdir(buf, file->mode) < 0)
267 save_errno = errno ? errno : save_errno;
272 rsyserr(FINFO, save_errno, "mkdir %s failed",
277 ret_code = do_rmdir(fname);
278 if (DEBUG_GTE(BACKUP, 1)) {
279 rprintf(FINFO, "make_backup: RMDIR %s returns %i\n",
280 full_fname(fname), ret_code);
286 if (!kept && preserve_links && S_ISLNK(file->mode)) {
287 const char *sl = F_SYMLINK(file);
288 if (safe_symlinks && unsafe_symlink(sl, buf)) {
289 if (INFO_GTE(SYMSAFE, 1)) {
290 rprintf(FINFO, "ignoring unsafe symlink %s -> %s\n",
291 full_fname(buf), sl);
296 if (do_symlink(sl, buf) < 0) {
297 int save_errno = errno ? errno : EINVAL; /* 0 paranoia */
298 if (errno == ENOENT && make_bak_dir(buf) == 0) {
299 if (do_symlink(sl, buf) < 0)
300 save_errno = errno ? errno : save_errno;
305 rsyserr(FERROR, save_errno, "link %s -> \"%s\"",
306 full_fname(buf), sl);
315 if (!kept && !S_ISREG(file->mode)) {
316 rprintf(FINFO, "make_bak: skipping non-regular file %s\n",
322 /* move to keep tree if a file */
324 if (robust_move(fname, buf) != 0) {
325 rsyserr(FERROR, errno, "keep_backup failed: %s -> \"%s\"",
326 full_fname(fname), buf);
327 } else if (sx.st.st_nlink > 1) {
328 /* If someone has hard-linked the file into the backup
329 * dir, rename() might return success but do nothing! */
330 robust_unlink(fname); /* Just in case... */
334 set_file_attrs(buf, file, NULL, fname, 0);
335 preserve_xattrs = save_preserve_xattrs;
338 if (INFO_GTE(BACKUP, 1)) {
339 rprintf(FINFO, "backed up %s to %s\n",
346 /* main backup switch routine */
347 int make_backup(const char *fname)
350 return keep_backup(fname);
351 return make_simple_backup(fname);