mirror of
https://github.com/systemd/systemd.git
synced 2024-12-23 21:35:11 +03:00
138 lines
3.2 KiB
C
138 lines
3.2 KiB
C
/*
|
|
Unix SMB/CIFS implementation.
|
|
low level tdb backup and restore utility
|
|
Copyright (C) Andrew Tridgell 2002
|
|
|
|
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.
|
|
*/
|
|
|
|
/*
|
|
|
|
This program is meant for backup/restore of tdb databases. Typical usage would be:
|
|
tdbbackup *.tdb
|
|
when Samba shuts down cleanly, which will make a backup of all the local databases
|
|
to *.bak files. Then on Samba startup you would use:
|
|
tdbbackup -v *.tdb
|
|
and this will check the databases for corruption and if corruption is detected then
|
|
the backup will be restored.
|
|
|
|
You may also like to do a backup on a regular basis while Samba is
|
|
running, perhaps using cron.
|
|
|
|
The reason this program is needed is to cope with power failures
|
|
while Samba is running. A power failure could lead to database
|
|
corruption and Samba will then not start correctly.
|
|
|
|
Note that many of the databases in Samba are transient and thus
|
|
don't need to be backed up, so you can optimise the above a little
|
|
by only running the backup on the critical databases.
|
|
|
|
*/
|
|
|
|
#include <errno.h>
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <fcntl.h>
|
|
#include <unistd.h>
|
|
#include <string.h>
|
|
#include <fcntl.h>
|
|
#include <time.h>
|
|
#include <sys/mman.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/time.h>
|
|
#include <ctype.h>
|
|
#include <signal.h>
|
|
#include "tdb.h"
|
|
#include "tdbback.h"
|
|
|
|
/*
|
|
see if one file is newer than another
|
|
*/
|
|
static int file_newer(const char *fname1, const char *fname2)
|
|
{
|
|
struct stat st1, st2;
|
|
if (stat(fname1, &st1) != 0) {
|
|
return 0;
|
|
}
|
|
if (stat(fname2, &st2) != 0) {
|
|
return 1;
|
|
}
|
|
return (st1.st_mtime > st2.st_mtime);
|
|
}
|
|
|
|
static void usage(void)
|
|
{
|
|
printf("Usage: tdbbackup [options] <fname...>\n\n");
|
|
printf(" -h this help message\n");
|
|
printf(" -s suffix set the backup suffix\n");
|
|
printf(" -v verify mode (restore if corrupt)\n");
|
|
}
|
|
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
int i;
|
|
int ret = 0;
|
|
int c;
|
|
int verify = 0;
|
|
const char *suffix = ".bak";
|
|
extern int optind;
|
|
extern char *optarg;
|
|
|
|
while ((c = getopt(argc, argv, "vhs:")) != -1) {
|
|
switch (c) {
|
|
case 'h':
|
|
usage();
|
|
exit(0);
|
|
case 'v':
|
|
verify = 1;
|
|
break;
|
|
case 's':
|
|
suffix = optarg;
|
|
break;
|
|
}
|
|
}
|
|
|
|
argc -= optind;
|
|
argv += optind;
|
|
|
|
if (argc < 1) {
|
|
usage();
|
|
exit(1);
|
|
}
|
|
|
|
for (i=0; i<argc; i++) {
|
|
const char *fname = argv[i];
|
|
char *bak_name;
|
|
|
|
bak_name = add_suffix(fname, suffix);
|
|
|
|
if (verify) {
|
|
if (verify_tdb(fname, bak_name) != 0) {
|
|
ret = 1;
|
|
}
|
|
} else {
|
|
if (file_newer(fname, bak_name) &&
|
|
backup_tdb(fname, bak_name) != 0) {
|
|
ret = 1;
|
|
}
|
|
}
|
|
|
|
free(bak_name);
|
|
}
|
|
|
|
return ret;
|
|
}
|