2 * Backup handling code.
4 * Copyright (C) 1999 Andrew Tridgell
5 * Copyright (C) 2003-2007 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 version 2 as
9 * published by the Free Software Foundation.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
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 static int make_bak_dir(char *fullpath)
98 struct file_struct *file;
99 char *rel = fullpath + backup_dir_len;
100 char *end = rel + strlen(rel);
103 while (strncmp(fullpath, "./", 2) == 0)
106 /* Try to find an existing dir, starting from the deepest dir. */
108 if (--p == fullpath) {
114 if (mkdir_defmode(fullpath) == 0)
116 if (errno != ENOENT) {
117 rsyserr(FERROR, errno,
118 "make_bak_dir mkdir %s failed",
119 full_fname(fullpath));
125 /* Make all the dirs that we didn't find on the way here. */
128 /* Try to transfer the directory settings of the
129 * actual dir that the files are coming from. */
130 if (x_stat(rel, &sx.st, NULL) < 0) {
131 rsyserr(FERROR, errno,
132 "make_bak_dir stat %s failed",
136 sx.acc_acl = sx.def_acl = NULL;
138 #ifdef SUPPORT_XATTRS
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(fullpath, file, NULL, NULL, 0);
165 if (mkdir_defmode(fullpath) < 0) {
166 rsyserr(FERROR, errno, "make_bak_dir mkdir %s failed",
167 full_fname(fullpath));
181 /* robustly move a file, creating new directory structures if necessary */
182 static int robust_move(const char *src, char *dst)
184 if (robust_rename(src, dst, NULL, 0755) < 0
185 && (errno != ENOENT || make_bak_dir(dst) < 0
186 || robust_rename(src, dst, NULL, 0755) < 0))
192 /* If we have a --backup-dir, then we get here from make_backup().
193 * We will move the file to be deleted into a parallel directory tree. */
194 static int keep_backup(const char *fname)
197 struct file_struct *file;
202 /* return if no file to keep */
203 if (x_lstat(fname, &sx.st, NULL) < 0)
206 sx.acc_acl = sx.def_acl = NULL;
208 #ifdef SUPPORT_XATTRS
212 if (!(file = make_file(fname, NULL, NULL, 0, NO_FILTERS)))
213 return 1; /* the file could have disappeared */
215 if (!(buf = get_backup_name(fname))) {
221 if (preserve_acls && !S_ISLNK(file->mode)) {
223 cache_acl(file, &sx);
227 #ifdef SUPPORT_XATTRS
228 if (preserve_xattrs) {
229 get_xattr(fname, &sx);
230 cache_xattr(file, &sx);
235 /* Check to see if this is a device file, or link */
236 if ((am_root && preserve_devices && IS_DEVICE(file->mode))
237 || (preserve_specials && IS_SPECIAL(file->mode))) {
238 uint32 *devp = F_RDEV_P(file);
239 dev_t rdev = MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp));
241 if (do_mknod(buf, file->mode, rdev) < 0
242 && (errno != ENOENT || make_bak_dir(buf) < 0
243 || do_mknod(buf, file->mode, rdev) < 0)) {
244 rsyserr(FERROR, errno, "mknod %s failed",
246 } else if (verbose > 2) {
247 rprintf(FINFO, "make_backup: DEVICE %s successful.\n",
254 if (!kept && S_ISDIR(file->mode)) {
255 /* make an empty directory */
256 if (do_mkdir(buf, file->mode) < 0
257 && (errno != ENOENT || make_bak_dir(buf) < 0
258 || do_mkdir(buf, file->mode) < 0)) {
259 rsyserr(FINFO, errno, "mkdir %s failed",
263 ret_code = do_rmdir(fname);
265 rprintf(FINFO, "make_backup: RMDIR %s returns %i\n",
266 full_fname(fname), ret_code);
272 if (!kept && preserve_links && S_ISLNK(file->mode)) {
273 const char *sl = F_SYMLINK(file);
274 if (safe_symlinks && unsafe_symlink(sl, buf)) {
276 rprintf(FINFO, "ignoring unsafe symlink %s -> %s\n",
277 full_fname(buf), sl);
282 if (do_symlink(sl, buf) < 0
283 && (errno != ENOENT || make_bak_dir(buf) < 0
284 || do_symlink(sl, buf) < 0)) {
285 rsyserr(FERROR, errno, "link %s -> \"%s\"",
286 full_fname(buf), sl);
294 if (!kept && !S_ISREG(file->mode)) {
295 rprintf(FINFO, "make_bak: skipping non-regular file %s\n",
301 /* move to keep tree if a file */
303 if (robust_move(fname, buf) != 0) {
304 rsyserr(FERROR, errno, "keep_backup failed: %s -> \"%s\"",
305 full_fname(fname), buf);
306 } else if (sx.st.st_nlink > 1) {
307 /* If someone has hard-linked the file into the backup
308 * dir, rename() might return success but do nothing! */
309 robust_unlink(fname); /* Just in case... */
312 set_file_attrs(buf, file, NULL, fname, 0);
316 rprintf(FINFO, "backed up %s to %s\n",
323 /* main backup switch routine */
324 int make_backup(const char *fname)
327 return keep_backup(fname);
328 return make_simple_backup(fname);