2 * Backup handling code.
4 * Copyright (C) 1999 Andrew Tridgell
5 * Copyright (C) 2003-2009 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) {
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. */
135 if (x_stat(rel, &sx.st, NULL) < 0) {
136 rsyserr(FERROR, errno,
137 "make_bak_dir stat %s failed",
141 sx.acc_acl = sx.def_acl = NULL;
143 #ifdef SUPPORT_XATTRS
146 if (!(file = make_file(rel, NULL, NULL, 0, NO_FILTERS)))
149 if (preserve_acls && !S_ISLNK(file->mode)) {
151 cache_tmp_acl(file, &sx);
155 #ifdef SUPPORT_XATTRS
156 if (preserve_xattrs) {
158 cache_tmp_xattr(file, &sx);
162 set_file_attrs(fbuf, file, NULL, NULL, 0);
167 #ifdef SUPPORT_XATTRS
168 uncache_tmp_xattrs();
176 if (mkdir_defmode(fbuf) < 0) {
177 rsyserr(FERROR, errno, "make_bak_dir mkdir %s failed",
186 /* robustly move a file, creating new directory structures if necessary */
187 static int robust_move(const char *src, char *dst)
189 if (robust_rename(src, dst, NULL, 0755) < 0) {
190 int save_errno = errno ? errno : EINVAL; /* 0 paranoia */
191 if (errno == ENOENT && make_bak_dir(dst) == 0) {
192 if (robust_rename(src, dst, NULL, 0755) < 0)
193 save_errno = errno ? errno : save_errno;
206 /* If we have a --backup-dir, then we get here from make_backup().
207 * We will move the file to be deleted into a parallel directory tree. */
208 static int keep_backup(const char *fname)
211 struct file_struct *file;
213 int save_preserve_xattrs = preserve_xattrs;
217 /* return if no file to keep */
218 if (x_lstat(fname, &sx.st, NULL) < 0)
221 sx.acc_acl = sx.def_acl = NULL;
223 #ifdef SUPPORT_XATTRS
227 if (!(file = make_file(fname, NULL, NULL, 0, NO_FILTERS)))
228 return 1; /* the file could have disappeared */
230 if (!(buf = get_backup_name(fname))) {
235 #ifdef SUPPORT_XATTRS
236 uncache_tmp_xattrs();
242 if (preserve_acls && !S_ISLNK(file->mode)) {
244 cache_tmp_acl(file, &sx);
248 #ifdef SUPPORT_XATTRS
249 if (preserve_xattrs) {
250 get_xattr(fname, &sx);
251 cache_tmp_xattr(file, &sx);
256 /* Check to see if this is a device file, or link */
257 if ((am_root && preserve_devices && IS_DEVICE(file->mode))
258 || (preserve_specials && IS_SPECIAL(file->mode))) {
261 if (do_mknod(buf, file->mode, sx.st.st_rdev) < 0) {
262 save_errno = errno ? errno : EINVAL; /* 0 paranoia */
263 if (errno == ENOENT && make_bak_dir(buf) == 0) {
264 if (do_mknod(buf, file->mode, sx.st.st_rdev) < 0)
265 save_errno = errno ? errno : save_errno;
270 rsyserr(FERROR, save_errno, "mknod %s failed",
275 if (verbose > 2 && save_errno == 0) {
276 rprintf(FINFO, "make_backup: DEVICE %s successful.\n",
283 if (!kept && S_ISDIR(file->mode)) {
284 /* make an empty directory */
285 if (do_mkdir(buf, file->mode) < 0) {
286 int save_errno = errno ? errno : EINVAL; /* 0 paranoia */
287 if (errno == ENOENT && make_bak_dir(buf) == 0) {
288 if (do_mkdir(buf, file->mode) < 0)
289 save_errno = errno ? errno : save_errno;
294 rsyserr(FINFO, save_errno, "mkdir %s failed",
299 ret_code = do_rmdir(fname);
301 rprintf(FINFO, "make_backup: RMDIR %s returns %i\n",
302 full_fname(fname), ret_code);
308 if (!kept && preserve_links && S_ISLNK(file->mode)) {
309 const char *sl = F_SYMLINK(file);
310 if (safe_symlinks && unsafe_symlink(sl, fname)) {
312 rprintf(FINFO, "not backing up unsafe symlink \"%s\" -> \"%s\"\n",
318 if (do_symlink(sl, buf) < 0) {
319 int save_errno = errno ? errno : EINVAL; /* 0 paranoia */
320 if (errno == ENOENT && make_bak_dir(buf) == 0) {
321 if (do_symlink(sl, buf) < 0)
322 save_errno = errno ? errno : save_errno;
327 rsyserr(FERROR, save_errno, "link %s -> \"%s\"",
328 full_fname(buf), sl);
337 if (!kept && !S_ISREG(file->mode)) {
338 rprintf(FINFO, "make_bak: skipping non-regular file %s\n",
344 #ifdef SUPPORT_XATTRS
345 uncache_tmp_xattrs();
350 /* move to keep tree if a file */
352 if (robust_move(fname, buf) != 0) {
353 rsyserr(FERROR, errno, "keep_backup failed: %s -> \"%s\"",
354 full_fname(fname), buf);
355 } else if (sx.st.st_nlink > 1) {
356 /* If someone has hard-linked the file into the backup
357 * dir, rename() might return success but do nothing! */
358 robust_unlink(fname); /* Just in case... */
362 set_file_attrs(buf, file, NULL, fname, 0);
363 preserve_xattrs = save_preserve_xattrs;
368 #ifdef SUPPORT_XATTRS
369 uncache_tmp_xattrs();
373 rprintf(FINFO, "backed up %s to %s\n",
380 /* main backup switch routine */
381 int make_backup(const char *fname)
384 return keep_backup(fname);
385 return make_simple_backup(fname);