extern int verbose;
extern char *backup_suffix;
+extern char *backup_dir;
-int make_backup(char *fname)
+extern int am_root;
+extern int preserve_devices;
+extern int preserve_links;
+extern int preserve_hard_links;
+
+/* simple backup creates a backup with a suffix in the same directory */
+static int make_simple_backup(char *fname)
{
char fnamebak[MAXPATHLEN];
if (strlen(fname) + strlen(backup_suffix) > (MAXPATHLEN-1)) {
return 0;
}
- slprintf(fnamebak,sizeof(fnamebak),"%s%s",fname,backup_suffix);
+ snprintf(fnamebak,sizeof(fnamebak),"%s%s",fname,backup_suffix);
if (do_rename(fname,fnamebak) != 0) {
/* cygwin (at least version b19) reports EINVAL */
if (errno != ENOENT && errno != EINVAL) {
- rprintf(FERROR,"rename %s %s : %s\n",fname,fnamebak,strerror(errno));
+ rsyserr(FERROR, errno, "rename %s to backup %s", fname, fnamebak);
return 0;
}
} else if (verbose > 1) {
}
return 1;
}
+
+
+/* recursively make a directory path */
+static int make_dir(char *name, int mask)
+{
+ char newdir [MAXPATHLEN];
+ char *p, *d;
+
+ /* copy pathname over, look for last '/' */
+ for (p = d = newdir; *name; *d++ = *name++)
+ if (*name == '/')
+ p = d;
+ if (p == newdir)
+ return 0;
+ *p = 0;
+
+ /* make the new directory, if that fails then make its parent */
+ while (do_mkdir (newdir, mask) != 0)
+ if ((errno != ENOENT) || !make_dir (newdir, mask))
+ return 0;
+
+ return 1;
+} /* make_dir */
+
+
+/****************************************************************************
+Create a directory given an absolute path, perms based upon another directory
+path
+****************************************************************************/
+static int make_bak_dir(char *fname,char *bak_path)
+{
+ STRUCT_STAT st;
+ STRUCT_STAT *st2;
+ char fullpath[MAXPATHLEN];
+ extern int orig_umask;
+ char *p;
+ char *q;
+
+ while(strncmp(bak_path,"./",2)==0) bak_path += 2;
+
+ if(bak_path[strlen(bak_path)-1]!='/') {
+ snprintf(fullpath,sizeof(fullpath),"%s/",bak_path);
+ } else {
+ snprintf(fullpath,sizeof(fullpath),"%s",bak_path);
+ }
+ p=fullpath;
+ q=&fullpath[strlen(fullpath)]; /* End of bak_path string */
+ strcat(fullpath,fname);
+
+ /* Make the directories */
+ while ((p=strchr(p,'/'))) {
+ *p = 0;
+ if(do_lstat(fullpath,&st)!=0) {
+ do_mkdir(fullpath,0777 & ~orig_umask);
+ if(p>q) {
+ if(do_lstat(q,&st)!=0) {
+ rprintf(FERROR,"make_bak_dir stat %s : %s\n",fullpath,strerror(errno));
+ } else {
+ st2=&st;
+ set_modtime(fullpath,st2->st_mtime);
+ if(do_lchown(fullpath,st2->st_uid,st2->st_gid)!=0) {
+ rprintf(FERROR,"make_bak_dir chown %s : %s\n",fullpath,strerror(errno));
+ };
+ if(do_chmod(fullpath,st2->st_mode)!=0) {
+ rprintf(FERROR,"make_bak_dir failed to set permissions on %s : %s\n",fullpath,strerror(errno));
+ };
+ };
+ }
+ };
+ *p = '/';
+ p++;
+ }
+ return 0;
+}
+
+/* robustly move a file, creating new directory structures if necessary */
+static int robust_move(char *src, char *dst)
+{
+ int keep_trying = 4;
+ int keep_path_extfs = 0;
+ int failed;
+
+ while (keep_trying) {
+ if (keep_path_extfs) {
+ failed = copy_file(src, dst, 0755);
+ if (!failed) {
+ do_unlink(src);
+ }
+ } else {
+ failed = robust_rename (src, dst);
+ }
+
+ if (failed) {
+ if (verbose > 2)
+ rprintf (FERROR, "robust_move failed: %s(%d)\n",
+ strerror (errno), errno);
+ switch (errno) {
+ /* external filesystem */
+ case EXDEV:
+ keep_path_extfs = 1;
+ keep_trying--;
+ break;
+ /* no directory to write to */
+ case ENOENT:
+ make_dir (dst, 0755);
+ keep_trying--;
+ break;
+ default:
+ keep_trying = 0;
+ } /* switch */
+ } else
+ keep_trying = 0;
+ } /* while */
+ return (!failed);
+} /* robust_move */
+
+
+/* if we have a backup_dir, then we get here from make_backup().
+ We will move the file to be deleted into a parallel directory tree */
+static int keep_backup(char *fname)
+{
+
+ static int initialised;
+
+ char keep_name [MAXPATHLEN];
+ STRUCT_STAT st;
+ struct file_struct *file;
+
+ int kept=0;
+ int ret_code;
+
+ if (!initialised) {
+ if (backup_dir[strlen(backup_dir) - 1] == '/')
+ backup_dir[strlen(backup_dir) - 1] = 0;
+ if (verbose > 0)
+ rprintf (FINFO, "backup_dir is %s\n", backup_dir);
+ initialised = 1;
+ }
+
+ /* return if no file to keep */
+#if SUPPORT_LINKS
+ if (do_lstat (fname, &st)) return 1;
+#else
+ if (do_stat (fname, &st)) return 1;
+#endif
+
+ file = make_file(-1, fname, NULL, 1);
+
+ /* the file could have disappeared */
+ if (!file) return 1;
+
+ /* make a complete pathname for backup file */
+ if (strlen(backup_dir) + strlen(fname) > (MAXPATHLEN - 1)) {
+ rprintf (FERROR, "keep_backup filename too long\n");
+ return 0;
+ }
+
+ snprintf(keep_name, sizeof (keep_name), "%s/%s", backup_dir, fname);
+
+
+#ifdef HAVE_MKNOD
+ /* Check to see if this is a device file, or link */
+ if(IS_DEVICE(file->mode)) {
+ if(am_root && preserve_devices) {
+ make_bak_dir(fname,backup_dir);
+ if(do_mknod(keep_name,file->mode,file->rdev)!=0) {
+ rprintf(FERROR,"mknod %s : %s\n",keep_name,strerror(errno));
+ } else {
+ if(verbose>2)
+ rprintf(FINFO,"make_backup : DEVICE %s successful.\n",fname);
+ };
+ };
+ kept=1;
+ do_unlink(fname);
+ };
+#endif
+
+ if(!kept && S_ISDIR(file->mode)) {
+ /* make an empty directory */
+ make_bak_dir(fname,backup_dir);
+ do_mkdir(keep_name,file->mode);
+ ret_code=do_rmdir(fname);
+ if(verbose>2)
+ rprintf(FINFO,"make_backup : RMDIR %s returns %i\n",fname,ret_code);
+ kept=1;
+ };
+
+#if SUPPORT_LINKS
+ if(!kept && preserve_links && S_ISLNK(file->mode)) {
+ extern int safe_symlinks;
+ if (safe_symlinks && unsafe_symlink(file->link, keep_name)) {
+ if (verbose) {
+ rprintf(FINFO,"ignoring unsafe symlink %s -> %s\n",
+ keep_name,file->link);
+ }
+ kept=1;
+ }
+ make_bak_dir(fname,backup_dir);
+ if(do_symlink(file->link,keep_name) != 0) {
+ rprintf(FERROR,"link %s -> %s : %s\n",keep_name,file->link,strerror(errno));
+ };
+ do_unlink(fname);
+ kept=1;
+ };
+#endif
+ if(!kept && preserve_hard_links && check_hard_link(file)) {
+ if(verbose > 1) rprintf(FINFO,"%s is a hard link\n",f_name(file));
+ };
+
+ if(!kept && !S_ISREG(file->mode)) {
+ rprintf(FINFO,"make_bak: skipping non-regular file %s\n",fname);
+ }
+
+ /* move to keep tree if a file */
+ if(!kept) {
+ if (!robust_move (fname, keep_name))
+ rprintf(FERROR, "keep_backup failed %s -> %s : %s\n",
+ fname, keep_name, strerror(errno));
+ };
+ set_perms (keep_name, file, NULL, 0);
+ free_file (file);
+ free (file);
+
+ if (verbose > 1)
+ rprintf (FINFO, "keep_backup %s -> %s\n", fname, keep_name);
+ return 1;
+} /* keep_backup */
+
+
+/* main backup switch routine */
+int make_backup(char *fname)
+{
+ if (backup_dir)
+ return (keep_backup(fname));
+ else
+ return (make_simple_backup(fname));
+}
+
Matt McCutchen's Web Site / rsync / rsync.git / blobdiff