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(-1, fname, NULL, 1);
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", backup_dir, fname, backup_suffix);
216 snprintf(keep_name, sizeof (keep_name), "%s/%s", backup_dir, fname);
221 /* Check to see if this is a device file, or link */
222 if(IS_DEVICE(file->mode)) {
223 if(am_root && preserve_devices) {
224 make_bak_dir(fname,backup_dir);
225 if(do_mknod(keep_name,file->mode,file->rdev)!=0) {
226 rprintf(FERROR,"mknod %s : %s\n",keep_name,strerror(errno));
229 rprintf(FINFO,"make_backup : DEVICE %s successful.\n",fname);
237 if(!kept && S_ISDIR(file->mode)) {
238 /* make an empty directory */
239 make_bak_dir(fname,backup_dir);
240 do_mkdir(keep_name,file->mode);
241 ret_code=do_rmdir(fname);
243 rprintf(FINFO,"make_backup : RMDIR %s returns %i\n",fname,ret_code);
248 if(!kept && preserve_links && S_ISLNK(file->mode)) {
249 extern int safe_symlinks;
250 if (safe_symlinks && unsafe_symlink(file->link, keep_name)) {
252 rprintf(FINFO,"ignoring unsafe symlink %s -> %s\n",
253 keep_name,file->link);
257 make_bak_dir(fname,backup_dir);
258 if(do_symlink(file->link,keep_name) != 0) {
259 rprintf(FERROR,"link %s -> %s : %s\n",keep_name,file->link,strerror(errno));
265 if(!kept && preserve_hard_links && check_hard_link(file)) {
266 if(verbose > 1) rprintf(FINFO,"%s is a hard link\n",f_name(file));
269 if(!kept && !S_ISREG(file->mode)) {
270 rprintf(FINFO,"make_bak: skipping non-regular file %s\n",fname);
273 /* move to keep tree if a file */
275 if (!robust_move (fname, keep_name))
276 rprintf(FERROR, "keep_backup failed %s -> %s : %s\n",
277 fname, keep_name, strerror(errno));
279 set_perms (keep_name, file, NULL, 0);
284 rprintf (FINFO, "keep_backup %s -> %s\n", fname, keep_name);
289 /* main backup switch routine */
290 int make_backup(char *fname)
293 return (keep_backup(fname));
295 return (make_simple_backup(fname));