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https://github.com/samba-team/samba.git
synced 2024-12-27 03:21:53 +03:00
added -v and -s options
-v is used for verify/restore from backup
This commit is contained in:
Andrew Tridgell
parent
96299b6391
commit
1438cd8e50
@ -53,36 +53,37 @@ static int test_fn(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA dbuf, void *state)
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}
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/*
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carefully backup a tdb to %s.bak, validating the contents and
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carefully backup a tdb, validating the contents and
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only doing the backup if its OK
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this function is also used for restore
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*/
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static int backup_tdb(const char *fname)
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static int backup_tdb(const char *old_name, const char *new_name)
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{
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TDB_CONTEXT *tdb;
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TDB_CONTEXT *tdb_new;
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char *tmp_name = NULL;
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char *bak_name = NULL;
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struct stat st;
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int count1, count2;
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asprintf(&tmp_name, "%s.tmp", fname);
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asprintf(&tmp_name, "%s.tmp", new_name);
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/* stat the old tdb to find its permissions */
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if (stat(fname, &st) != 0) {
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perror(fname);
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if (stat(old_name, &st) != 0) {
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perror(old_name);
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return 1;
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}
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/* open the old tdb */
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tdb = tdb_open(fname, 0, 0, O_RDWR, 0);
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tdb = tdb_open(old_name, 0, 0, O_RDWR, 0);
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if (!tdb) {
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printf("Failed to open %s\n", fname);
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printf("Failed to open %s\n", old_name);
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return 1;
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}
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/* create the new tdb */
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unlink(tmp_name);
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tdb_new = tdb_open(tmp_name, 0, TDB_DEFAULT, O_RDWR|O_CREAT|O_EXCL,
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tdb_new = tdb_open(tmp_name, tdb->header.hash_size,
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TDB_DEFAULT, O_RDWR|O_CREAT|O_EXCL,
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st.st_mode & 0777);
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if (!tdb_new) {
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perror(tmp_name);
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@ -92,7 +93,7 @@ static int backup_tdb(const char *fname)
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/* lock the old tdb */
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if (tdb_lockall(tdb) != 0) {
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fprintf(stderr,"Failed to lock %s\n", fname);
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fprintf(stderr,"Failed to lock %s\n", old_name);
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tdb_close(tdb);
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tdb_close(tdb_new);
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unlink(tmp_name);
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@ -105,7 +106,7 @@ static int backup_tdb(const char *fname)
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/* traverse and copy */
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count1 = tdb_traverse(tdb, copy_fn, (void *)tdb_new);
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if (count1 < 0 || failed) {
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fprintf(stderr,"failed to backup %s\n", fname);
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fprintf(stderr,"failed to copy %s\n", old_name);
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tdb_close(tdb);
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tdb_close(tdb_new);
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unlink(tmp_name);
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@ -130,43 +131,120 @@ static int backup_tdb(const char *fname)
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/* traverse the new tdb to confirm */
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count2 = tdb_traverse(tdb_new, test_fn, 0);
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if (count2 != count1) {
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fprintf(stderr,"failed to backup %s\n", fname);
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fprintf(stderr,"failed to copy %s\n", old_name);
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tdb_close(tdb_new);
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unlink(tmp_name);
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free(tmp_name);
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return 1;
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}
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/* make sure the new tdb has reached stable storage */
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fsync(tdb_new->fd);
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/* close the new tdb and rename it to .bak */
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tdb_close(tdb_new);
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asprintf(&bak_name, "%s.bak", fname);
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unlink(bak_name);
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if (rename(tmp_name, bak_name) != 0) {
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perror(bak_name);
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unlink(new_name);
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if (rename(tmp_name, new_name) != 0) {
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perror(new_name);
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free(tmp_name);
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free(bak_name);
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return 1;
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}
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printf("%s : %d records\n", fname, count1);
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printf("%s : %d records\n", old_name, count1);
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free(tmp_name);
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free(bak_name);
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return 0;
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}
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/*
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verify a tdb and if it is corrupt then restore from *.bak
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*/
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static int verify_tdb(const char *fname, const char *bak_name)
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{
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TDB_CONTEXT *tdb;
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int count = -1;
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/* open the tdb */
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tdb = tdb_open(fname, 0, 0, O_RDONLY, 0);
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/* traverse the tdb, then close it */
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if (tdb) {
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count = tdb_traverse(tdb, test_fn, NULL);
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tdb_close(tdb);
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}
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/* count is < 0 means an error */
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if (count < 0) {
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printf("restoring %s\n", fname);
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return backup_tdb(bak_name, fname);
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}
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printf("%s : %d records\n", fname, count);
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return 0;
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}
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static void usage(void)
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{
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printf("Usage: tdbbackup [options] <fname...>\n\n");
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printf(" -h this help message\n");
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printf(" -s suffix set the backup suffix\n");
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printf(" -v veryify mode (restore if corrupt)\n");
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}
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int main(int argc, char *argv[])
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{
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int i;
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int ret = 0;
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int c;
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int verify = 0;
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char *suffix = ".bak";
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extern int optind;
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extern char *optarg;
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if (argc < 2) {
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printf("Usage: tdbbackup [options] <fname...>\n");
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while ((c = getopt(argc, argv, "vhs:")) != -1) {
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switch (c) {
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case 'h':
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usage();
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exit(0);
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case 'v':
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verify = 1;
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break;
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case 's':
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suffix = optarg;
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break;
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}
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}
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argc -= optind;
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argv += optind;
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if (argc < 1) {
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usage();
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exit(1);
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}
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for (i=1; i<argc; i++) {
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if (backup_tdb(argv[i]) != 0) ret = 1;
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for (i=0; i<argc; i++) {
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const char *fname = argv[i];
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char *bak_name = NULL;
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asprintf(&bak_name, "%s%s", fname, suffix);
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if (verify) {
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if (verify_tdb(fname, bak_name) != 0) {
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ret = 1;
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}
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} else {
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if (backup_tdb(fname, bak_name) != 0) {
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ret = 1;
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}
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}
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free(bak_name);
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}
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return ret;
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