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add a new command "ctdb tfetch" that can read a record straight out of the

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tdb file.

the command automatically strips off the initial ctdb header off the record so it can only be used on ctdb managed tdb files, not on normal tdb files.

(This used to be ctdb commit c3a816e5174abefb5155f65d8faad7b1e831e481)
This commit is contained in:
Ronnie Sahlberg 2010-08-25 10:53:54 +10:00
parent f75b984b71
commit 018063b8eb
1 changed files with 49 additions and 0 deletions
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49
ctdb/tools/ctdb.c
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@ -2933,6 +2933,54 @@ static int control_pfetch(struct ctdb_context *ctdb, int argc, const char **argv
return 0;
}
/*
fetch a record from a tdb-file
*/
static int control_tfetch(struct ctdb_context *ctdb, int argc, const char **argv)
{
const char *tdb_file;
TDB_CONTEXT *tdb;
TDB_DATA key, data;
int fd;
if (argc < 2) {
usage();
}
tdb_file = argv[0];
tdb = tdb_open(tdb_file, 0, 0, O_RDONLY, 0);
if (tdb == NULL) {
DEBUG(DEBUG_ERR,("Failed to open TDB file %s\n", tdb_file));
return -1;
}
key.dptr = discard_const(argv[1]);
key.dsize = strlen(argv[1]);
data = tdb_fetch(tdb, key);
if (data.dptr == NULL || data.dsize < sizeof(struct ctdb_ltdb_header)) {
DEBUG(DEBUG_ERR,("Failed to read record %s from tdb %s\n", argv[1], tdb_file));
tdb_close(tdb);
return -1;
}
tdb_close(tdb);
if (argc == 3) {
fd = open(argv[2], O_WRONLY|O_CREAT|O_TRUNC, 0600);
if (fd == -1) {
DEBUG(DEBUG_ERR,("Failed to open output file %s\n", argv[2]));
return -1;
}
write(fd, data.dptr+sizeof(struct ctdb_ltdb_header), data.dsize-sizeof(struct ctdb_ltdb_header));
close(fd);
} else {
write(1, data.dptr+sizeof(struct ctdb_ltdb_header), data.dsize-sizeof(struct ctdb_ltdb_header));
}
return 0;
}
/*
write a record to a persistent database
*/
@ -4710,6 +4758,7 @@ static const struct {
{ "sync", control_ipreallocate, true, false, "wait until ctdbd has synced all state changes" },
{ "pfetch", control_pfetch, true, false, "fetch a record from a persistent database", "<db> <key> [<file>]" },
{ "pstore", control_pstore, true, false, "write a record to a persistent database", "<db> <key> <file containing record>" },
{ "tfetch", control_tfetch, true, false, "fetch a record from a [c]tdb-file", "<tdb-file> <key> [<file>]" },
};
/*