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/*
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 */
#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;
/* simple backup creates a backup with a suffix in the same directory */
static int make_simple_backup(char *fname)
{
char fnamebak[MAXPATHLEN];
if (stringjoin(fnamebak, sizeof fnamebak, fname, backup_suffix, NULL)
>= sizeof fnamebak) {
rprintf(FERROR, "backup filename too long\n");
return 0;
}
if (do_rename(fname, fnamebak) != 0) {
/* cygwin (at least version b19) reports EINVAL */
if (errno != ENOENT && errno != EINVAL) {
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);
}
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) {
rprintf(FERROR,
"make_bak_dir mkdir %s failed: %s\n",
full_fname(fullpath), strerror(errno));
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_lstat(rel, &st) != 0) {
rprintf(FERROR,
"make_bak_dir stat %s failed: %s\n",
full_fname(rel), strerror(errno));
} else {
set_modtime(fullpath, st.st_mtime);
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) {
rprintf(FERROR,
"make_bak_dir mkdir %s failed: %s\n",
full_fname(fullpath), strerror(errno));
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;
int kept = 0;
int ret_code;
/* 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(backup_dir_buf + backup_dir_len, backup_dir_remainder,
fname, backup_suffix, NULL) >= backup_dir_remainder) {
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) {
if (do_mknod(backup_dir_buf, file->mode, file->u.rdev) < 0
&& (errno != ENOENT || make_bak_dir(backup_dir_buf) < 0
|| do_mknod(backup_dir_buf, file->mode, file->u.rdev) < 0)) {
rprintf(FERROR, "mknod %s failed: %s\n",
full_fname(backup_dir_buf), 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 */
if (do_mkdir(backup_dir_buf, file->mode) < 0
&& (errno != ENOENT || make_bak_dir(backup_dir_buf) < 0
|| do_mkdir(backup_dir_buf, file->mode) < 0)) {
rprintf(FINFO, "mkdir %s failed: %s\n",
full_fname(backup_dir_buf), strerror(errno));
}
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)) {
if (safe_symlinks && unsafe_symlink(file->u.link, backup_dir_buf)) {
if (verbose) {
rprintf(FINFO, "ignoring unsafe symlink %s -> %s\n",
full_fname(backup_dir_buf), file->u.link);
}
kept = 1;
}
if (do_symlink(file->u.link, backup_dir_buf) < 0
&& (errno != ENOENT || make_bak_dir(backup_dir_buf) < 0
|| do_symlink(file->u.link, backup_dir_buf) < 0)) {
rprintf(FERROR, "link %s -> %s : %s\n",
full_fname(backup_dir_buf), file->u.link, strerror(errno));
}
do_unlink(fname);
kept = 1;
}
#endif
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, backup_dir_buf) != 0) {
rprintf(FERROR, "keep_backup failed: %s -> \"%s\": %s\n",
full_fname(fname), backup_dir_buf, strerror(errno));
}
}
set_perms(backup_dir_buf, file, NULL, 0);
free(file);
if (verbose > 1)
rprintf(FINFO, "keep_backup %s -> %s\n", fname, backup_dir_buf);
return 1;
}
/* main backup switch routine */
int make_backup(char *fname)
{
if (backup_dir)
return keep_backup(fname);
return make_simple_backup(fname);
}
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