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.
24 extern int preserve_acls;
25 extern int preserve_xattrs;
26 extern int preserve_devices;
27 extern int preserve_specials;
28 extern int preserve_links;
29 extern int safe_symlinks;
30 extern int backup_dir_len;
31 extern unsigned int backup_dir_remainder;
32 extern char backup_dir_buf[MAXPATHLEN];
33 extern char *backup_suffix;
34 extern char *backup_dir;
36 /* make a complete pathname for backup file */
37 char *get_backup_name(const char *fname)
40 if (stringjoin(backup_dir_buf + backup_dir_len, backup_dir_remainder,
41 fname, backup_suffix, NULL) < backup_dir_remainder)
42 return backup_dir_buf;
44 if (stringjoin(backup_dir_buf, MAXPATHLEN,
45 fname, backup_suffix, NULL) < MAXPATHLEN)
46 return backup_dir_buf;
49 rprintf(FERROR, "backup filename too long\n");
53 /* simple backup creates a backup with a suffix in the same directory */
54 static int make_simple_backup(const char *fname)
57 const char *fnamebak = get_backup_name(fname);
63 if (do_rename(fname, fnamebak) == 0) {
64 if (INFO_GTE(BACKUP, 1)) {
65 rprintf(FINFO, "backed up %s to %s\n",
70 /* cygwin (at least version b19) reports EINVAL */
71 if (errno == ENOENT || errno == EINVAL)
75 if (errno == EISDIR && do_rmdir(fnamebak) == 0)
77 if (errno == ENOTDIR && do_unlink(fnamebak) == 0)
80 rsyserr(FERROR, rename_errno, "rename %s to backup %s",
90 /****************************************************************************
91 Create a directory given an absolute path, perms based upon another directory
93 ****************************************************************************/
94 int make_bak_dir(const char *fullpath)
96 char fbuf[MAXPATHLEN], *rel, *end, *p;
97 struct file_struct *file;
98 int len = backup_dir_len;
101 while (*fullpath == '.' && fullpath[1] == '/') {
106 if (strlcpy(fbuf, fullpath, sizeof fbuf) >= sizeof fbuf)
110 end = p = rel + strlen(rel);
112 /* Try to find an existing dir, starting from the deepest dir. */
118 if (mkdir_defmode(fbuf) == 0)
120 if (errno != ENOENT) {
121 rsyserr(FERROR, errno,
122 "make_bak_dir mkdir %s failed",
129 /* Make all the dirs that we didn't find on the way here. */
132 /* Try to transfer the directory settings of the
133 * actual dir that the files are coming from. */
134 if (x_stat(rel, &sx.st, NULL) < 0) {
135 rsyserr(FERROR, errno,
136 "make_bak_dir stat %s failed",
140 sx.acc_acl = sx.def_acl = NULL;
142 #ifdef SUPPORT_XATTRS
145 if (!(file = make_file(rel, NULL, NULL, 0, NO_FILTERS)))
148 if (preserve_acls && !S_ISLNK(file->mode)) {
150 cache_acl(file, &sx);
154 #ifdef SUPPORT_XATTRS
155 if (preserve_xattrs) {
157 cache_xattr(file, &sx);
161 set_file_attrs(fbuf, file, NULL, NULL, 0);
169 if (mkdir_defmode(fbuf) < 0) {
170 rsyserr(FERROR, errno, "make_bak_dir mkdir %s failed",
179 /* robustly move a file, creating new directory structures if necessary */
180 static int robust_move(const char *src, char *dst)
182 if (robust_rename(src, dst, NULL, 0755) < 0) {
183 int save_errno = errno ? errno : EINVAL; /* 0 paranoia */
184 if (errno == ENOENT && make_bak_dir(dst) == 0) {
185 if (robust_rename(src, dst, NULL, 0755) < 0)
186 save_errno = errno ? errno : save_errno;
199 /* If we have a --backup-dir, then we get here from make_backup().
200 * We will move the file to be deleted into a parallel directory tree. */
201 static int keep_backup(const char *fname)
204 struct file_struct *file;
206 int save_preserve_xattrs = preserve_xattrs;
210 /* return if no file to keep */
211 if (x_lstat(fname, &sx.st, NULL) < 0)
214 sx.acc_acl = sx.def_acl = NULL;
216 #ifdef SUPPORT_XATTRS
220 if (!(file = make_file(fname, NULL, NULL, 0, NO_FILTERS)))
221 return 1; /* the file could have disappeared */
223 if (!(buf = get_backup_name(fname))) {
229 if (preserve_acls && !S_ISLNK(file->mode)) {
231 cache_acl(file, &sx);
235 #ifdef SUPPORT_XATTRS
236 if (preserve_xattrs) {
237 get_xattr(fname, &sx);
238 cache_xattr(file, &sx);
243 /* Check to see if this is a device file, or link */
244 if ((am_root && preserve_devices && IS_DEVICE(file->mode))
245 || (preserve_specials && IS_SPECIAL(file->mode))) {
248 if (do_mknod(buf, file->mode, sx.st.st_rdev) < 0) {
249 save_errno = errno ? errno : EINVAL; /* 0 paranoia */
250 if (errno == ENOENT && make_bak_dir(buf) == 0) {
251 if (do_mknod(buf, file->mode, sx.st.st_rdev) < 0)
252 save_errno = errno ? errno : save_errno;
257 rsyserr(FERROR, save_errno, "mknod %s failed",
262 if (DEBUG_GTE(BACKUP, 1) && save_errno == 0) {
263 rprintf(FINFO, "make_backup: DEVICE %s successful.\n",
270 if (!kept && S_ISDIR(file->mode)) {
271 /* make an empty directory */
272 if (do_mkdir(buf, file->mode) < 0) {
273 int save_errno = errno ? errno : EINVAL; /* 0 paranoia */
274 if (errno == ENOENT && make_bak_dir(buf) == 0) {
275 if (do_mkdir(buf, file->mode) < 0)
276 save_errno = errno ? errno : save_errno;
281 rsyserr(FINFO, save_errno, "mkdir %s failed",
286 ret_code = do_rmdir(fname);
287 if (DEBUG_GTE(BACKUP, 1)) {
288 rprintf(FINFO, "make_backup: RMDIR %s returns %i\n",
289 full_fname(fname), ret_code);
295 if (!kept && preserve_links && S_ISLNK(file->mode)) {
296 const char *sl = F_SYMLINK(file);
297 if (safe_symlinks && unsafe_symlink(sl, buf)) {
298 if (INFO_GTE(SYMSAFE, 1)) {
299 rprintf(FINFO, "ignoring unsafe symlink %s -> %s\n",
300 full_fname(buf), sl);
305 if (do_symlink(sl, buf) < 0) {
306 int save_errno = errno ? errno : EINVAL; /* 0 paranoia */
307 if (errno == ENOENT && make_bak_dir(buf) == 0) {
308 if (do_symlink(sl, buf) < 0)
309 save_errno = errno ? errno : save_errno;
314 rsyserr(FERROR, save_errno, "link %s -> \"%s\"",
315 full_fname(buf), sl);
324 if (!kept && !S_ISREG(file->mode)) {
325 rprintf(FINFO, "make_bak: skipping non-regular file %s\n",
331 /* move to keep tree if a file */
333 if (robust_move(fname, buf) != 0) {
334 rsyserr(FERROR, errno, "keep_backup failed: %s -> \"%s\"",
335 full_fname(fname), buf);
336 } else if (sx.st.st_nlink > 1) {
337 /* If someone has hard-linked the file into the backup
338 * dir, rename() might return success but do nothing! */
339 robust_unlink(fname); /* Just in case... */
343 set_file_attrs(buf, file, NULL, fname, 0);
344 preserve_xattrs = save_preserve_xattrs;
347 if (INFO_GTE(BACKUP, 1)) {
348 rprintf(FINFO, "backed up %s to %s\n",
355 /* main backup switch routine */
356 int make_backup(const char *fname)
359 return keep_backup(fname);
360 return make_simple_backup(fname);