-/*
+/*
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 unsigned int backup_dir_remainder;
+extern char backup_dir_buf[MAXPATHLEN];
extern char *backup_suffix;
+extern char *backup_dir;
+extern int am_root;
+extern int preserve_devices;
+extern int preserve_links;
+extern int preserve_hard_links;
+extern int orig_umask;
+extern int safe_symlinks;
-int make_backup(char *fname)
+/* make a complete pathname for backup file */
+char *get_backup_name(char *fname)
{
- char fnamebak[MAXPATHLEN];
- if (strlen(fname) + strlen(backup_suffix) > (MAXPATHLEN-1)) {
- rprintf(FERROR,"backup filename too long\n");
- return 0;
+ if (backup_dir) {
+ if (stringjoin(backup_dir_buf + backup_dir_len, backup_dir_remainder,
+ fname, backup_suffix, NULL) < backup_dir_remainder)
+ return backup_dir_buf;
+ } else {
+ if (stringjoin(backup_dir_buf, MAXPATHLEN,
+ fname, backup_suffix, NULL) < MAXPATHLEN)
+ return backup_dir_buf;
}
- slprintf(fnamebak,sizeof(fnamebak),"%s%s",fname,backup_suffix);
- if (do_rename(fname,fnamebak) != 0) {
+ rprintf(FERROR, "backup filename too long\n");
+ return NULL;
+}
+
+/* simple backup creates a backup with a suffix in the same directory */
+static int make_simple_backup(char *fname)
+{
+ int rename_errno;
+ char *fnamebak = get_backup_name(fname);
+
+ if (!fnamebak)
+ return 0;
+
+ while (1) {
+ if (do_rename(fname, fnamebak) == 0) {
+ if (verbose > 1) {
+ rprintf(FINFO, "backed up %s to %s\n",
+ safe_fname(fname),
+ safe_fname(fnamebak));
+ }
+ break;
+ }
/* cygwin (at least version b19) reports EINVAL */
- if (errno != ENOENT && errno != EINVAL) {
- rprintf(FERROR,"rename %s %s : %s\n",fname,fnamebak,strerror(errno));
- return 0;
+ if (errno == ENOENT || errno == EINVAL)
+ break;
+
+ rename_errno = errno;
+ if (errno == EISDIR && do_rmdir(fnamebak) == 0)
+ continue;
+ if (errno == ENOTDIR && do_unlink(fnamebak) == 0)
+ continue;
+
+ rsyserr(FERROR, rename_errno, "rename %s to backup %s",
+ safe_fname(fname), safe_fname(fnamebak));
+ errno = rename_errno;
+ return 0;
+ }
+
+ return 1;
+}
+
+
+/****************************************************************************
+Create a directory given an absolute path, perms based upon another directory
+path
+****************************************************************************/
+static int make_bak_dir(char *fullpath)
+{
+ STRUCT_STAT st;
+ char *rel = fullpath + backup_dir_len;
+ char *end = rel + strlen(rel);
+ char *p = end;
+
+ while (strncmp(fullpath, "./", 2) == 0)
+ fullpath += 2;
+
+ /* Try to find an existing dir, starting from the deepest dir. */
+ while (1) {
+ if (--p == fullpath) {
+ p += strlen(p);
+ goto failure;
+ }
+ if (*p == '/') {
+ *p = '\0';
+ if (do_mkdir(fullpath, 0777 & ~orig_umask) == 0)
+ break;
+ if (errno != ENOENT) {
+ rsyserr(FERROR, errno,
+ "make_bak_dir mkdir %s failed",
+ full_fname(fullpath));
+ goto failure;
+ }
+ }
+ }
+
+ /* Make all the dirs that we didn't find on the way here. */
+ while (1) {
+ if (p >= rel) {
+ /* Try to transfer the directory settings of the
+ * actual dir that the files are coming from. */
+ if (do_stat(rel, &st) < 0) {
+ rsyserr(FERROR, errno,
+ "make_bak_dir stat %s failed",
+ full_fname(rel));
+ } else {
+ do_lchown(fullpath, st.st_uid, st.st_gid);
+ do_chmod(fullpath, st.st_mode);
+ }
+ }
+ *p = '/';
+ p += strlen(p);
+ if (p == end)
+ break;
+ if (do_mkdir(fullpath, 0777 & ~orig_umask) < 0) {
+ rsyserr(FERROR, errno, "make_bak_dir mkdir %s failed",
+ full_fname(fullpath));
+ goto failure;
+ }
+ }
+ return 0;
+
+failure:
+ while (p != end) {
+ *p = '/';
+ p += strlen(p);
+ }
+ return -1;
+}
+
+/* robustly move a file, creating new directory structures if necessary */
+static int robust_move(char *src, char *dst)
+{
+ if (robust_rename(src, dst, 0755) < 0 && (errno != ENOENT
+ || make_bak_dir(dst) < 0 || robust_rename(src, dst, 0755) < 0))
+ return -1;
+ return 0;
+}
+
+
+/* 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)
+{
+ STRUCT_STAT st;
+ struct file_struct *file;
+ char *buf;
+ int kept = 0;
+ int ret_code;
+
+ /* return if no file to keep */
+ if (do_lstat(fname, &st) < 0)
+ return 1;
+
+ if (!(file = make_file(fname, NULL, NO_FILTERS)))
+ return 1; /* the file could have disappeared */
+
+ if (!(buf = get_backup_name(fname)))
+ return 0;
+
+ /* Check to see if this is a device file, or link */
+ if (IS_DEVICE(file->mode)) {
+ if (am_root && preserve_devices) {
+ if (do_mknod(buf, file->mode, file->u.rdev) < 0
+ && (errno != ENOENT || make_bak_dir(buf) < 0
+ || do_mknod(buf, file->mode, file->u.rdev) < 0)) {
+ rsyserr(FERROR, errno, "mknod %s failed",
+ full_fname(buf));
+ } else if (verbose > 2) {
+ rprintf(FINFO,
+ "make_backup: DEVICE %s successful.\n",
+ safe_fname(fname));
+ }
+ }
+ kept = 1;
+ do_unlink(fname);
+ }
+
+ if (!kept && S_ISDIR(file->mode)) {
+ /* make an empty directory */
+ if (do_mkdir(buf, file->mode) < 0
+ && (errno != ENOENT || make_bak_dir(buf) < 0
+ || do_mkdir(buf, file->mode) < 0)) {
+ rsyserr(FINFO, errno, "mkdir %s failed",
+ full_fname(buf));
+ }
+
+ ret_code = do_rmdir(fname);
+ if (verbose > 2) {
+ rprintf(FINFO, "make_backup: RMDIR %s returns %i\n",
+ full_fname(fname), ret_code);
}
- } else if (verbose > 1) {
- rprintf(FINFO,"backed up %s to %s\n",fname,fnamebak);
+ kept = 1;
+ }
+
+#ifdef SUPPORT_LINKS
+ if (!kept && preserve_links && S_ISLNK(file->mode)) {
+ if (safe_symlinks && unsafe_symlink(file->u.link, buf)) {
+ if (verbose) {
+ rprintf(FINFO, "ignoring unsafe symlink %s -> %s\n",
+ full_fname(buf), file->u.link);
+ }
+ kept = 1;
+ }
+ if (do_symlink(file->u.link, buf) < 0
+ && (errno != ENOENT || make_bak_dir(buf) < 0
+ || do_symlink(file->u.link, buf) < 0)) {
+ rsyserr(FERROR, errno, "link %s -> \"%s\"",
+ full_fname(buf), safe_fname(file->u.link));
+ }
+ do_unlink(fname);
+ kept = 1;
+ }
+#endif
+
+ if (!kept && !S_ISREG(file->mode)) {
+ rprintf(FINFO, "make_bak: skipping non-regular file %s\n",
+ safe_fname(fname));
+ return 1;
+ }
+
+ /* move to keep tree if a file */
+ if (!kept) {
+ if (robust_move(fname, buf) != 0) {
+ rsyserr(FERROR, errno, "keep_backup failed: %s -> \"%s\"",
+ full_fname(fname), safe_fname(buf));
+ } else if (st.st_nlink > 1) {
+ /* If someone has hard-linked the file into the backup
+ * dir, rename() might return success but do nothing! */
+ robust_unlink(fname); /* Just in case... */
+ }
+ }
+ set_perms(buf, file, NULL, 0);
+ free(file);
+
+ if (verbose > 1) {
+ rprintf(FINFO, "backed up %s to %s\n",
+ safe_fname(fname), safe_fname(buf));
}
return 1;
}
+
+
+/* main backup switch routine */
+int make_backup(char *fname)
+{
+ if (backup_dir)
+ return keep_backup(fname);
+ return make_simple_backup(fname);
+}