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 3 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, 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) {
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 static int make_bak_dir(char *fullpath)
97 struct file_struct *file;
98 char *rel = fullpath + backup_dir_len;
99 char *end = rel + strlen(rel);
102 while (strncmp(fullpath, "./", 2) == 0)
105 /* Try to find an existing dir, starting from the deepest dir. */
107 if (--p == fullpath) {
113 if (mkdir_defmode(fullpath) == 0)
115 if (errno != ENOENT) {
116 rsyserr(FERROR, errno,
117 "make_bak_dir mkdir %s failed",
118 full_fname(fullpath));
124 /* Make all the dirs that we didn't find on the way here. */
127 /* Try to transfer the directory settings of the
128 * actual dir that the files are coming from. */
129 if (x_stat(rel, &sx.st, NULL) < 0) {
130 rsyserr(FERROR, errno,
131 "make_bak_dir stat %s failed",
135 sx.acc_acl = sx.def_acl = NULL;
137 #ifdef SUPPORT_XATTRS
140 if (!(file = make_file(rel, NULL, NULL, 0, NO_FILTERS)))
143 if (preserve_acls && !S_ISLNK(file->mode)) {
145 cache_acl(file, &sx);
149 #ifdef SUPPORT_XATTRS
150 if (preserve_xattrs) {
152 cache_xattr(file, &sx);
156 set_file_attrs(fullpath, file, NULL, NULL, 0);
164 if (mkdir_defmode(fullpath) < 0) {
165 rsyserr(FERROR, errno, "make_bak_dir mkdir %s failed",
166 full_fname(fullpath));
180 /* robustly move a file, creating new directory structures if necessary */
181 static int robust_move(const char *src, char *dst)
183 if (robust_rename(src, dst, NULL, 0755) < 0
184 && (errno != ENOENT || make_bak_dir(dst) < 0
185 || robust_rename(src, dst, NULL, 0755) < 0))
191 /* If we have a --backup-dir, then we get here from make_backup().
192 * We will move the file to be deleted into a parallel directory tree. */
193 static int keep_backup(const char *fname)
196 struct file_struct *file;
201 /* return if no file to keep */
202 if (x_lstat(fname, &sx.st, NULL) < 0)
205 sx.acc_acl = sx.def_acl = NULL;
207 #ifdef SUPPORT_XATTRS
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))) {
237 uint32 *devp = F_RDEV_P(file);
238 dev_t rdev = MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp));
240 if (do_mknod(buf, file->mode, rdev) < 0
241 && (errno != ENOENT || make_bak_dir(buf) < 0
242 || do_mknod(buf, file->mode, rdev) < 0)) {
243 rsyserr(FERROR, errno, "mknod %s failed",
245 } else if (verbose > 2) {
246 rprintf(FINFO, "make_backup: DEVICE %s successful.\n",
253 if (!kept && S_ISDIR(file->mode)) {
254 /* make an empty directory */
255 if (do_mkdir(buf, file->mode) < 0
256 && (errno != ENOENT || make_bak_dir(buf) < 0
257 || do_mkdir(buf, file->mode) < 0)) {
258 rsyserr(FINFO, errno, "mkdir %s failed",
262 ret_code = do_rmdir(fname);
264 rprintf(FINFO, "make_backup: RMDIR %s returns %i\n",
265 full_fname(fname), ret_code);
271 if (!kept && preserve_links && S_ISLNK(file->mode)) {
272 const char *sl = F_SYMLINK(file);
273 if (safe_symlinks && unsafe_symlink(sl, buf)) {
275 rprintf(FINFO, "ignoring unsafe symlink %s -> %s\n",
276 full_fname(buf), sl);
281 if (do_symlink(sl, buf) < 0
282 && (errno != ENOENT || make_bak_dir(buf) < 0
283 || do_symlink(sl, buf) < 0)) {
284 rsyserr(FERROR, errno, "link %s -> \"%s\"",
285 full_fname(buf), sl);
293 if (!kept && !S_ISREG(file->mode)) {
294 rprintf(FINFO, "make_bak: skipping non-regular file %s\n",
300 /* move to keep tree if a file */
302 if (robust_move(fname, buf) != 0) {
303 rsyserr(FERROR, errno, "keep_backup failed: %s -> \"%s\"",
304 full_fname(fname), buf);
305 } else if (sx.st.st_nlink > 1) {
306 /* If someone has hard-linked the file into the backup
307 * dir, rename() might return success but do nothing! */
308 robust_unlink(fname); /* Just in case... */
311 set_file_attrs(buf, file, NULL, fname, 0);
315 rprintf(FINFO, "backed up %s to %s\n",
322 /* main backup switch routine */
323 int make_backup(const char *fname)
326 return keep_backup(fname);
327 return make_simple_backup(fname);