-/*
+/*
Copyright (C) Andrew Tridgell 1999
-
+
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
-
+
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
-
+
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#include "rsync.h"
extern int verbose;
+extern int backup_suffix_len;
+extern int backup_dir_len;
extern char *backup_suffix;
+extern char *backup_dir;
+extern struct file_struct **hlink_list;
+extern int am_root;
+extern int preserve_devices;
+extern int preserve_links;
+extern int preserve_hard_links;
+extern int orig_umask;
-int make_backup(char *fname)
+/* 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)) {
- rprintf(FERROR,"backup filename too long\n");
+
+ if (stringjoin(fnamebak, sizeof fnamebak, fname, backup_suffix, NULL)
+ >= sizeof fnamebak) {
+ rprintf(FERROR, "backup filename too long\n");
return 0;
}
- slprintf(fnamebak,sizeof(fnamebak),"%s%s",fname,backup_suffix);
- if (do_rename(fname,fnamebak) != 0) {
+ 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) {
- rprintf(FINFO,"backed up %s to %s\n",fname,fnamebak);
+ rprintf(FINFO, "backed up %s to %s\n", fname, fnamebak);
+ }
+ 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];
+ char *p;
+ char *q;
+
+ while(strncmp(bak_path, "./", 2) == 0) bak_path += 2;
+
+ if (pathjoin(fullpath, sizeof fullpath, bak_path, fname)
+ >= sizeof fullpath) {
+ rprintf(FERROR, "backup dirname too long\n");
+ return 0;
+ }
+ p = fullpath;
+ q = fullpath + strlen(bak_path);
+ if (*q == '/')
+ q++; /* Point past the middle '/' added by pathjoin(). */
+
+ /* Make the directories */
+ while ((p = strchr(p, '/')) != NULL) {
+ *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 failed: %s\n",
+ full_fname(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 failed: %s\n",
+ full_fname(fullpath), strerror(errno));
+ }
+ if (do_chmod(fullpath, st2->st_mode) != 0) {
+ rprintf(FERROR, "make_bak_dir failed to set permissions on %s: %s\n",
+ full_fname(fullpath), strerror(errno));
+ }
+ }
+ }
+ }
+ *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) {
+ case EXDEV: /* external filesystem */
+ keep_path_extfs = 1;
+ keep_trying--;
+ break;
+ case ENOENT: /* no directory to write to */
+ make_dir(dst, 0700);
+ keep_trying--;
+ break;
+ default:
+ keep_trying = 0;
+ break;
+ }
+ } 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_len && backup_dir[backup_dir_len - 1] == '/')
+ backup_dir[--backup_dir_len] = '\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(fname, NULL, NO_EXCLUDES);
+
+ /* the file could have disappeared */
+ if (!file) return 1;
+
+ /* make a complete pathname for backup file */
+ if (stringjoin(keep_name, sizeof keep_name,
+ backup_dir, "/", fname, backup_suffix, NULL)
+ >= sizeof keep_name) {
+ rprintf(FERROR, "keep_backup filename too long\n");
+ return 0;
+ }
+
+#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->u.rdev) != 0) {
+ rprintf(FERROR, "mknod %s failed: %s\n",
+ full_fname(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",
+ full_fname(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->u.link, keep_name)) {
+ if (verbose) {
+ rprintf(FINFO, "ignoring unsafe symlink %s -> %s\n",
+ full_fname(keep_name), file->u.link);
+ }
+ kept = 1;
+ }
+ make_bak_dir(fname, backup_dir);
+ if (do_symlink(file->u.link, keep_name) != 0) {
+ rprintf(FERROR, "link %s -> %s : %s\n",
+ full_fname(keep_name), file->u.link, strerror(errno));
+ }
+ do_unlink(fname);
+ kept = 1;
+ }
+#endif
+ if (!kept && preserve_hard_links && file->link_u.links
+ && hlink_list[file->F_HLINDEX] != 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",
+ full_fname(fname), keep_name, strerror(errno));
+ }
+ }
+ set_perms(keep_name, file, NULL, 0);
+ 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);
+ return make_simple_backup(fname);
}
Matt McCutchen's Web Site / rsync / rsync.git / blobdiff