2 Copyright (C) Andrew Tridgell 1999
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 /* backup handling code */
24 extern int suffix_specified;
25 extern char *backup_suffix;
26 extern char *backup_dir;
30 extern int preserve_devices;
31 extern int preserve_links;
32 extern int preserve_hard_links;
34 /* simple backup creates a backup with a suffix in the same directory */
35 static int make_simple_backup(char *fname)
37 char fnamebak[MAXPATHLEN];
38 if (strlen(fname) + strlen(backup_suffix) > (MAXPATHLEN-1)) {
39 rprintf(FERROR, "backup filename too long\n");
43 snprintf(fnamebak, sizeof(fnamebak), "%s%s", fname, backup_suffix);
44 if (do_rename(fname, fnamebak) != 0) {
45 /* cygwin (at least version b19) reports EINVAL */
46 if (errno != ENOENT && errno != EINVAL) {
47 rsyserr(FERROR, errno, "rename %s to backup %s", fname, fnamebak);
50 } else if (verbose > 1) {
51 rprintf(FINFO, "backed up %s to %s\n", fname, fnamebak);
57 /* recursively make a directory path */
58 static int make_dir(char *name, int mask)
60 char newdir [MAXPATHLEN];
63 /* copy pathname over, look for last '/' */
64 for (p = d = newdir; *name; *d++ = *name++)
71 /* make the new directory, if that fails then make its parent */
72 while (do_mkdir (newdir, mask) != 0)
73 if ((errno != ENOENT) || !make_dir (newdir, mask))
80 /****************************************************************************
81 Create a directory given an absolute path, perms based upon another directory
83 ****************************************************************************/
84 static int make_bak_dir(char *fname, char *bak_path)
88 char fullpath[MAXPATHLEN];
89 extern int orig_umask;
93 while(strncmp(bak_path, "./", 2) == 0) bak_path += 2;
95 if(bak_path[strlen(bak_path)-1] != '/') {
96 snprintf(fullpath, sizeof(fullpath), "%s/", bak_path);
98 snprintf(fullpath, sizeof(fullpath), "%s", bak_path);
101 q = &fullpath[strlen(fullpath)]; /* End of bak_path string */
102 strcat(fullpath, fname);
104 /* Make the directories */
105 while ((p = strchr(p, '/'))) {
107 if(do_lstat(fullpath, &st) != 0) {
108 do_mkdir(fullpath, 0777 & ~orig_umask);
110 if(do_lstat(q, &st) != 0) {
111 rprintf(FERROR, "make_bak_dir stat %s : %s\n", fullpath, strerror(errno));
114 set_modtime(fullpath, st2->st_mtime);
115 if(do_lchown(fullpath, st2->st_uid, st2->st_gid) != 0) {
116 rprintf(FERROR, "make_bak_dir chown %s : %s\n", fullpath, strerror(errno));
118 if(do_chmod(fullpath, st2->st_mode) != 0) {
119 rprintf(FERROR, "make_bak_dir failed to set permissions on %s : %s\n", fullpath, strerror(errno));
130 /* robustly move a file, creating new directory structures if necessary */
131 static int robust_move(char *src, char *dst)
134 int keep_path_extfs = 0;
137 while (keep_trying) {
138 if (keep_path_extfs) {
139 failed = copy_file(src, dst, 0755);
144 failed = robust_rename (src, dst);
149 rprintf (FERROR, "robust_move failed: %s(%d)\n",
150 strerror (errno), errno);
152 /* external filesystem */
157 /* no directory to write to */
159 make_dir (dst, 0755);
172 /* if we have a backup_dir, then we get here from make_backup().
173 We will move the file to be deleted into a parallel directory tree */
174 static int keep_backup(char *fname)
177 static int initialised;
179 char keep_name [MAXPATHLEN];
181 struct file_struct *file;
187 if (backup_dir[strlen(backup_dir) - 1] == '/')
188 backup_dir[strlen(backup_dir) - 1] = 0;
190 rprintf (FINFO, "backup_dir is %s\n", backup_dir);
194 /* return if no file to keep */
196 if (do_lstat (fname, &st)) return 1;
198 if (do_stat (fname, &st)) return 1;
201 file = make_file(fname, NULL, NO_EXCLUDES);
203 /* the file could have disappeared */
206 /* make a complete pathname for backup file */
207 if (strlen(backup_dir) + strlen(fname) +
208 (suffix_specified ? strlen(backup_suffix) : 0) > (MAXPATHLEN - 1)) {
209 rprintf (FERROR, "keep_backup filename too long\n");
213 if (suffix_specified) {
214 snprintf(keep_name, sizeof (keep_name), "%s/%s%s",
215 backup_dir, fname, backup_suffix);
217 snprintf(keep_name, sizeof (keep_name), "%s/%s",
223 /* Check to see if this is a device file, or link */
224 if(IS_DEVICE(file->mode)) {
225 if(am_root && preserve_devices) {
226 make_bak_dir(fname, backup_dir);
227 if(do_mknod(keep_name, file->mode, file->rdev) != 0) {
228 rprintf(FERROR, "mknod %s : %s\n",
229 keep_name, strerror(errno));
230 } else if(verbose>2) {
231 rprintf(FINFO, "make_backup : DEVICE %s successful.\n", fname);
239 if(!kept && S_ISDIR(file->mode)) {
240 /* make an empty directory */
241 make_bak_dir(fname, backup_dir);
242 do_mkdir(keep_name, file->mode);
243 ret_code = do_rmdir(fname);
246 rprintf(FINFO, "make_backup : RMDIR %s returns %i\n",
253 if(!kept && preserve_links && S_ISLNK(file->mode)) {
254 extern int safe_symlinks;
255 if (safe_symlinks && unsafe_symlink(file->link, keep_name)) {
257 rprintf(FINFO, "ignoring unsafe symlink %s -> %s\n",
258 keep_name, file->link);
262 make_bak_dir(fname, backup_dir);
263 if(do_symlink(file->link, keep_name) != 0) {
264 rprintf(FERROR, "link %s -> %s : %s\n",
265 keep_name, file->link, strerror(errno));
271 if(!kept && preserve_hard_links && check_hard_link(file)) {
273 rprintf(FINFO, "%s is a hard link\n", f_name(file));
276 if(!kept && !S_ISREG(file->mode)) {
277 rprintf(FINFO, "make_bak: skipping non-regular file %s\n",
281 /* move to keep tree if a file */
283 if (!robust_move (fname, keep_name)) {
284 rprintf(FERROR, "keep_backup failed %s -> %s : %s\n",
285 fname, keep_name, strerror(errno));
288 set_perms (keep_name, file, NULL, 0);
293 rprintf (FINFO, "keep_backup %s -> %s\n", fname, keep_name);
298 /* main backup switch routine */
299 int make_backup(char *fname)
302 return (keep_backup(fname));
304 return (make_simple_backup(fname));