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_devices;
26 extern int preserve_specials;
27 extern int preserve_links;
28 extern int safe_symlinks;
29 extern int backup_dir_len;
30 extern unsigned int backup_dir_remainder;
31 extern char backup_dir_buf[MAXPATHLEN];
32 extern char *backup_suffix;
33 extern char *backup_dir;
35 /* make a complete pathname for backup file */
36 char *get_backup_name(const char *fname)
39 if (stringjoin(backup_dir_buf + backup_dir_len, backup_dir_remainder,
40 fname, backup_suffix, NULL) < backup_dir_remainder)
41 return backup_dir_buf;
43 if (stringjoin(backup_dir_buf, MAXPATHLEN,
44 fname, backup_suffix, NULL) < MAXPATHLEN)
45 return backup_dir_buf;
48 rprintf(FERROR, "backup filename too long\n");
52 /* simple backup creates a backup with a suffix in the same directory */
53 static int make_simple_backup(const char *fname)
56 const char *fnamebak = get_backup_name(fname);
62 if (do_rename(fname, fnamebak) == 0) {
64 rprintf(FINFO, "backed up %s to %s\n",
69 /* cygwin (at least version b19) reports EINVAL */
70 if (errno == ENOENT || errno == EINVAL)
74 if (errno == EISDIR && do_rmdir(fnamebak) == 0)
76 if (errno == ENOTDIR && do_unlink(fnamebak) == 0)
79 rsyserr(FERROR, rename_errno, "rename %s to backup %s",
89 /****************************************************************************
90 Create a directory given an absolute path, perms based upon another directory
92 ****************************************************************************/
93 static int make_bak_dir(char *fullpath)
96 char *rel = fullpath + backup_dir_len;
97 char *end = rel + strlen(rel);
100 while (strncmp(fullpath, "./", 2) == 0)
103 /* Try to find an existing dir, starting from the deepest dir. */
105 if (--p == fullpath) {
111 if (mkdir_defmode(fullpath) == 0)
113 if (errno != ENOENT) {
114 rsyserr(FERROR, errno,
115 "make_bak_dir mkdir %s failed",
116 full_fname(fullpath));
122 /* Make all the dirs that we didn't find on the way here. */
125 /* Try to transfer the directory settings of the
126 * actual dir that the files are coming from. */
127 if (do_stat(rel, &st) < 0) {
128 rsyserr(FERROR, errno,
129 "make_bak_dir stat %s failed",
132 do_lchown(fullpath, st.st_uid, st.st_gid);
134 do_chmod(fullpath, st.st_mode);
142 if (mkdir_defmode(fullpath) < 0) {
143 rsyserr(FERROR, errno, "make_bak_dir mkdir %s failed",
144 full_fname(fullpath));
158 /* robustly move a file, creating new directory structures if necessary */
159 static int robust_move(const char *src, char *dst)
161 if (robust_rename(src, dst, NULL, 0755) < 0
162 && (errno != ENOENT || make_bak_dir(dst) < 0
163 || robust_rename(src, dst, NULL, 0755) < 0))
169 /* If we have a --backup-dir, then we get here from make_backup().
170 * We will move the file to be deleted into a parallel directory tree. */
171 static int keep_backup(const char *fname)
174 struct file_struct *file;
179 /* return if no file to keep */
180 if (do_lstat(fname, &st) < 0)
183 if (!(file = make_file(fname, NULL, NULL, 0, NO_FILTERS)))
184 return 1; /* the file could have disappeared */
186 if (!(buf = get_backup_name(fname))) {
191 /* Check to see if this is a device file, or link */
192 if ((am_root && preserve_devices && IS_DEVICE(file->mode))
193 || (preserve_specials && IS_SPECIAL(file->mode))) {
194 uint32 *devp = F_RDEV_P(file);
195 dev_t rdev = MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp));
197 if (do_mknod(buf, file->mode, rdev) < 0
198 && (errno != ENOENT || make_bak_dir(buf) < 0
199 || do_mknod(buf, file->mode, rdev) < 0)) {
200 rsyserr(FERROR, errno, "mknod %s failed",
202 } else if (verbose > 2) {
203 rprintf(FINFO, "make_backup: DEVICE %s successful.\n",
210 if (!kept && S_ISDIR(file->mode)) {
211 /* make an empty directory */
212 if (do_mkdir(buf, file->mode) < 0
213 && (errno != ENOENT || make_bak_dir(buf) < 0
214 || do_mkdir(buf, file->mode) < 0)) {
215 rsyserr(FINFO, errno, "mkdir %s failed",
219 ret_code = do_rmdir(fname);
221 rprintf(FINFO, "make_backup: RMDIR %s returns %i\n",
222 full_fname(fname), ret_code);
228 if (!kept && preserve_links && S_ISLNK(file->mode)) {
229 const char *sl = F_SYMLINK(file);
230 if (safe_symlinks && unsafe_symlink(sl, buf)) {
232 rprintf(FINFO, "ignoring unsafe symlink %s -> %s\n",
233 full_fname(buf), sl);
238 if (do_symlink(sl, buf) < 0
239 && (errno != ENOENT || make_bak_dir(buf) < 0
240 || do_symlink(sl, buf) < 0)) {
241 rsyserr(FERROR, errno, "link %s -> \"%s\"",
242 full_fname(buf), sl);
250 if (!kept && !S_ISREG(file->mode)) {
251 rprintf(FINFO, "make_bak: skipping non-regular file %s\n",
257 /* move to keep tree if a file */
259 if (robust_move(fname, buf) != 0) {
260 rsyserr(FERROR, errno, "keep_backup failed: %s -> \"%s\"",
261 full_fname(fname), buf);
262 } else if (st.st_nlink > 1) {
263 /* If someone has hard-linked the file into the backup
264 * dir, rename() might return success but do nothing! */
265 robust_unlink(fname); /* Just in case... */
268 set_file_attrs(buf, file, NULL, 0);
272 rprintf(FINFO, "backed up %s to %s\n",
279 /* main backup switch routine */
280 int make_backup(const char *fname)
283 return keep_backup(fname);
284 return make_simple_backup(fname);