-/*
- 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.
-*/
-
-/* backup handling code */
+/*
+ * Backup handling code.
+ *
+ * Copyright (C) 1999 Andrew Tridgell
+ * Copyright (C) 2003-2009 Wayne Davison
+ *
+ * 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 3 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, visit the http://fsf.org website.
+ */
#include "rsync.h"
+#include "ifuncs.h"
-extern int verbose;
+extern int am_root;
+extern int preserve_acls;
+extern int preserve_xattrs;
+extern int preserve_devices;
+extern int preserve_specials;
+extern int preserve_links;
+extern int safe_symlinks;
+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;
+/* make a complete pathname for backup file */
+char *get_backup_name(const char *fname)
+{
+ 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;
+ }
+
+ rprintf(FERROR, "backup filename too long\n");
+ return NULL;
+}
+
+/****************************************************************************
+Create a directory given an absolute path, perms based upon another directory
+path
+****************************************************************************/
+int make_bak_dir(const char *fullpath)
+{
+ char fbuf[MAXPATHLEN], *rel, *end, *p;
+ struct file_struct *file;
+ int len = backup_dir_len;
+ stat_x sx;
+
+ while (*fullpath == '.' && fullpath[1] == '/') {
+ fullpath += 2;
+ len -= 2;
+ }
+
+ if (strlcpy(fbuf, fullpath, sizeof fbuf) >= sizeof fbuf)
+ return -1;
+
+ rel = fbuf + len;
+ end = p = rel + strlen(rel);
+
+ /* Try to find an existing dir, starting from the deepest dir. */
+ while (1) {
+ if (--p == fbuf)
+ return -1;
+ if (*p == '/') {
+ *p = '\0';
+ if (mkdir_defmode(fbuf) == 0)
+ break;
+ if (errno != ENOENT) {
+ rsyserr(FERROR, errno,
+ "make_bak_dir mkdir %s failed",
+ full_fname(fbuf));
+ return -1;
+ }
+ }
+ }
+
+ /* 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. */
+ init_stat_x(&sx);
+ if (x_stat(rel, &sx.st, NULL) < 0) {
+ rsyserr(FERROR, errno,
+ "make_bak_dir stat %s failed",
+ full_fname(rel));
+ } else {
+ if (!(file = make_file(rel, NULL, NULL, 0, NO_FILTERS)))
+ continue;
+#ifdef SUPPORT_ACLS
+ if (preserve_acls && !S_ISLNK(file->mode)) {
+ get_acl(rel, &sx);
+ cache_acl(file, &sx);
+ free_acl(&sx);
+ }
+#endif
+#ifdef SUPPORT_XATTRS
+ if (preserve_xattrs) {
+ get_xattr(rel, &sx);
+ cache_xattr(file, &sx);
+ free_xattr(&sx);
+ }
+#endif
+ set_file_attrs(fbuf, file, NULL, NULL, 0);
+ unmake_file(file);
+ }
+ }
+ *p = '/';
+ p += strlen(p);
+ if (p == end)
+ break;
+ if (mkdir_defmode(fbuf) < 0) {
+ rsyserr(FERROR, errno, "make_bak_dir mkdir %s failed",
+ full_fname(fbuf));
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
+/* Has same return codes as make_backup(). */
+static inline int link_or_rename(const char *from, const char *to,
+ BOOL prefer_rename, STRUCT_STAT *stp)
+{
+ if (S_ISLNK(stp->st_mode)) {
+ if (prefer_rename)
+ goto do_rename;
+#ifndef CAN_HARDLINK_SYMLINK
+ return 0; /* Use copy code. */
+#endif
+ }
+ if (IS_SPECIAL(stp->st_mode) || IS_DEVICE(stp->st_mode)) {
+ if (prefer_rename)
+ goto do_rename;
+#ifndef CAN_HARDLINK_SPECIAL
+ return 0; /* Use copy code. */
+#endif
+ }
+#ifdef SUPPORT_HARD_LINKS
+ if (!S_ISDIR(stp->st_mode)) {
+ if (do_link(from, to) == 0)
+ return 2;
+ return 0;
+ }
+#endif
+ do_rename:
+ if (do_rename(from, to) == 0) {
+ if (stp->st_nlink > 1 && !S_ISDIR(stp->st_mode)) {
+ /* If someone has hard-linked the file into the backup
+ * dir, rename() might return success but do nothing! */
+ robust_unlink(to); /* Just in case... */
+ }
+ return 1;
+ }
+ return 0;
+}
-int make_backup(char *fname)
+/* Hard-link, rename, or copy an item to the backup name. Returns 2 if item
+ * was duplicated into backup area, 1 if item was moved, or 0 for failure.*/
+int make_backup(const char *fname, BOOL prefer_rename)
{
- char fnamebak[MAXPATHLEN];
- if (strlen(fname) + strlen(backup_suffix) > (MAXPATHLEN-1)) {
- rprintf(FERROR,"backup filename too long\n");
+ stat_x sx;
+ struct file_struct *file;
+ int save_preserve_xattrs;
+ char *buf = get_backup_name(fname);
+ int ret = 0;
+
+ if (!buf)
return 0;
+
+ init_stat_x(&sx);
+ /* Return success if no file to keep. */
+ if (x_lstat(fname, &sx.st, NULL) < 0)
+ return 1;
+
+ /* Try a hard-link or a rename first. Using rename is not atomic, but
+ * is more efficient than forcing a copy for larger files when no hard-
+ * linking is possible. */
+ if ((ret = link_or_rename(fname, buf, prefer_rename, &sx.st)) != 0)
+ goto success;
+ if (errno == EEXIST) {
+ STRUCT_STAT bakst;
+ if (do_lstat(buf, &bakst) == 0) {
+ int flags = get_del_for_flag(bakst.st_mode) | DEL_FOR_BACKUP | DEL_RECURSE;
+ if (delete_item(buf, bakst.st_mode, flags) != 0)
+ return 0;
+ }
+ if ((ret = link_or_rename(fname, buf, prefer_rename, &sx.st)) != 0)
+ goto success;
+ } else if (backup_dir && errno == ENOENT) {
+ /* If the backup dir is missing, try again after making it. */
+ if (make_bak_dir(buf) != 0)
+ return 0;
+ if ((ret = link_or_rename(fname, buf, prefer_rename, &sx.st)) != 0)
+ goto success;
+ }
+
+ /* Fall back to making a copy. */
+ if (!(file = make_file(fname, NULL, &sx.st, 0, NO_FILTERS)))
+ return 1; /* the file could have disappeared */
+
+#ifdef SUPPORT_ACLS
+ if (preserve_acls && !S_ISLNK(file->mode)) {
+ get_acl(fname, &sx);
+ cache_acl(file, &sx);
+ free_acl(&sx);
}
+#endif
+#ifdef SUPPORT_XATTRS
+ if (preserve_xattrs) {
+ get_xattr(fname, &sx);
+ cache_xattr(file, &sx);
+ free_xattr(&sx);
+ }
+#endif
- slprintf(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));
+ /* Check to see if this is a device file, or link */
+ if ((am_root && preserve_devices && IS_DEVICE(file->mode))
+ || (preserve_specials && IS_SPECIAL(file->mode))) {
+ int save_errno;
+ if (do_mknod(buf, file->mode, sx.st.st_rdev) < 0) {
+ save_errno = errno ? errno : EINVAL; /* 0 paranoia */
+ if (errno == ENOENT && make_bak_dir(buf) == 0) {
+ if (do_mknod(buf, file->mode, sx.st.st_rdev) < 0)
+ save_errno = errno ? errno : save_errno;
+ else
+ save_errno = 0;
+ }
+ if (save_errno) {
+ rsyserr(FERROR, save_errno, "mknod %s failed",
+ full_fname(buf));
+ }
+ } else
+ save_errno = 0;
+ if (DEBUG_GTE(BACKUP, 1) && save_errno == 0) {
+ rprintf(FINFO, "make_backup: DEVICE %s successful.\n",
+ fname);
+ }
+ ret = 2;
+ }
+
+ if (!ret && S_ISDIR(file->mode)) {
+ int ret_code;
+ /* make an empty directory */
+ if (do_mkdir(buf, file->mode) < 0) {
+ int save_errno = errno ? errno : EINVAL; /* 0 paranoia */
+ if (errno == ENOENT && make_bak_dir(buf) == 0) {
+ if (do_mkdir(buf, file->mode) < 0)
+ save_errno = errno ? errno : save_errno;
+ else
+ save_errno = 0;
+ }
+ if (save_errno) {
+ rsyserr(FINFO, save_errno, "mkdir %s failed",
+ full_fname(buf));
+ }
+ }
+
+ ret_code = do_rmdir(fname);
+ if (DEBUG_GTE(BACKUP, 1)) {
+ rprintf(FINFO, "make_backup: RMDIR %s returns %i\n",
+ full_fname(fname), ret_code);
+ }
+ ret = 2;
+ }
+
+#ifdef SUPPORT_LINKS
+ if (!ret && preserve_links && S_ISLNK(file->mode)) {
+ const char *sl = F_SYMLINK(file);
+ if (safe_symlinks && unsafe_symlink(sl, fname)) {
+ if (INFO_GTE(SYMSAFE, 1)) {
+ rprintf(FINFO, "ignoring unsafe symlink %s -> %s\n",
+ full_fname(buf), sl);
+ }
+ ret = 2;
+ } else {
+ if (do_symlink(sl, buf) < 0) {
+ int save_errno = errno ? errno : EINVAL; /* 0 paranoia */
+ if (errno == ENOENT && make_bak_dir(buf) == 0) {
+ if (do_symlink(sl, buf) < 0)
+ save_errno = errno ? errno : save_errno;
+ else
+ save_errno = 0;
+ }
+ if (save_errno) {
+ rsyserr(FERROR, save_errno, "link %s -> \"%s\"",
+ full_fname(buf), sl);
+ }
+ }
+ ret = 2;
+ }
+ }
+#endif
+
+ if (!ret && !S_ISREG(file->mode)) {
+ rprintf(FINFO, "make_bak: skipping non-regular file %s\n",
+ fname);
+ unmake_file(file);
+ return 2;
+ }
+
+ /* Copy to backup tree if a file. */
+ if (!ret) {
+ if (copy_file(fname, buf, -1, file->mode, 1) < 0) {
+ rsyserr(FERROR, errno, "keep_backup failed: %s -> \"%s\"",
+ full_fname(fname), buf);
+ unmake_file(file);
return 0;
}
- } else if (verbose > 1) {
- rprintf(FINFO,"backed up %s to %s\n",fname,fnamebak);
+ ret = 2;
+ }
+
+ save_preserve_xattrs = preserve_xattrs;
+ preserve_xattrs = 0;
+ set_file_attrs(buf, file, NULL, fname, 0);
+ preserve_xattrs = save_preserve_xattrs;
+
+ unmake_file(file);
+
+ success:
+ if (INFO_GTE(BACKUP, 1)) {
+ rprintf(FINFO, "backed up %s to %s\n",
+ fname, buf);
}
- return 1;
+ return ret;
}