-/*
- 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) 2003-2008 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"
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;
+ }
-int make_backup(char *fname)
+ 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(const char *fname)
{
- char fnamebak[MAXPATHLEN];
- if (strlen(fname) + strlen(backup_suffix) > (MAXPATHLEN-1)) {
- rprintf(FERROR,"backup filename too long\n");
+ int rename_errno;
+ const char *fnamebak = get_backup_name(fname);
+
+ if (!fnamebak)
return 0;
- }
- slprintf(fnamebak,sizeof(fnamebak),"%s%s",fname,backup_suffix);
- if (do_rename(fname,fnamebak) != 0) {
+ while (1) {
+ if (do_rename(fname, fnamebak) == 0) {
+ if (verbose > 1) {
+ rprintf(FINFO, "backed up %s to %s\n",
+ 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",
+ fname, fnamebak);
+ errno = rename_errno;
+ return 0;
+ }
+
+ return 1;
+}
+
+
+/****************************************************************************
+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. */
+ if (x_stat(rel, &sx.st, NULL) < 0) {
+ rsyserr(FERROR, errno,
+ "make_bak_dir stat %s failed",
+ full_fname(rel));
+ } else {
+#ifdef SUPPORT_ACLS
+ sx.acc_acl = sx.def_acl = NULL;
+#endif
+#ifdef SUPPORT_XATTRS
+ sx.xattr = NULL;
+#endif
+ 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;
}
- } else if (verbose > 1) {
- rprintf(FINFO,"backed up %s to %s\n",fname,fnamebak);
+ }
+
+ return 0;
+}
+
+/* robustly move a file, creating new directory structures if necessary */
+static int robust_move(const char *src, char *dst)
+{
+ if (robust_rename(src, dst, NULL, 0755) < 0) {
+ int save_errno = errno ? errno : EINVAL; /* 0 paranoia */
+ if (errno == ENOENT && make_bak_dir(dst) == 0) {
+ if (robust_rename(src, dst, NULL, 0755) < 0)
+ save_errno = errno ? errno : save_errno;
+ else
+ save_errno = 0;
+ }
+ if (save_errno) {
+ errno = save_errno;
+ 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(const char *fname)
+{
+ stat_x sx;
+ struct file_struct *file;
+ char *buf;
+ int save_preserve_xattrs = preserve_xattrs;
+ int kept = 0;
+ int ret_code;
+
+ /* return if no file to keep */
+ if (x_lstat(fname, &sx.st, NULL) < 0)
+ return 1;
+#ifdef SUPPORT_ACLS
+ sx.acc_acl = sx.def_acl = NULL;
+#endif
+#ifdef SUPPORT_XATTRS
+ sx.xattr = NULL;
+#endif
+
+ if (!(file = make_file(fname, NULL, NULL, 0, NO_FILTERS)))
+ return 1; /* the file could have disappeared */
+
+ if (!(buf = get_backup_name(fname))) {
+ unmake_file(file);
+ return 0;
+ }
+
+#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
+
+ /* 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))) {
+ uint32 *devp = F_RDEV_P(file);
+ dev_t rdev = MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp));
+ do_unlink(buf);
+ if (do_mknod(buf, file->mode, rdev) < 0) {
+ int save_errno = errno ? errno : EINVAL; /* 0 paranoia */
+ if (errno == ENOENT && make_bak_dir(buf) == 0) {
+ if (do_mknod(buf, file->mode, 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 if (verbose > 2) {
+ rprintf(FINFO, "make_backup: DEVICE %s successful.\n",
+ fname);
+ }
+ kept = 1;
+ do_unlink(fname);
+ }
+
+ if (!kept && S_ISDIR(file->mode)) {
+ /* 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 (verbose > 2) {
+ rprintf(FINFO, "make_backup: RMDIR %s returns %i\n",
+ full_fname(fname), ret_code);
+ }
+ kept = 1;
+ }
+
+#ifdef SUPPORT_LINKS
+ if (!kept && preserve_links && S_ISLNK(file->mode)) {
+ const char *sl = F_SYMLINK(file);
+ if (safe_symlinks && unsafe_symlink(sl, buf)) {
+ if (verbose) {
+ rprintf(FINFO, "ignoring unsafe symlink %s -> %s\n",
+ full_fname(buf), sl);
+ }
+ kept = 1;
+ } else {
+ do_unlink(buf);
+ 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);
+ }
+ }
+ do_unlink(fname);
+ kept = 1;
+ }
+ }
+#endif
+
+ if (!kept && !S_ISREG(file->mode)) {
+ rprintf(FINFO, "make_bak: skipping non-regular file %s\n",
+ fname);
+ unmake_file(file);
+ 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), buf);
+ } else if (sx.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... */
+ }
+ }
+ preserve_xattrs = 0;
+ set_file_attrs(buf, file, NULL, fname, 0);
+ preserve_xattrs = save_preserve_xattrs;
+ unmake_file(file);
+
+ if (verbose > 1) {
+ rprintf(FINFO, "backed up %s to %s\n",
+ fname, buf);
}
return 1;
}
+
+
+/* main backup switch routine */
+int make_backup(const char *fname)
+{
+ if (backup_dir)
+ return keep_backup(fname);
+ return make_simple_backup(fname);
+}
Matt McCutchen's Web Site / rsync / rsync.git / blobdiff