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repmgr witness create --force: overwrite existing data directory

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Per Github #82 (dimitri).
This commit is contained in:
Ian Barwick
2015-09-30 17:01:23 +09:00
parent e115825cd6
commit 75aad9a85e
3 changed files with 48 additions and 7 deletions
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50
check_dir.c
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@@ -23,15 +23,19 @@
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <ftw.h>
/* NB: postgres_fe must be included BEFORE check_dir */
#include <libpq-fe.h>
#include <postgres_fe.h>
#include "check_dir.h"
#include "check_dir.h"
#include "strutil.h"
#include "log.h"
static bool _create_pg_dir(char *dir, bool force, bool for_witness);
static int unlink_dir_callback(const char *fpath, const struct stat *sb, int typeflag, struct FTW *ftwbuf);
/*
* make sure the directory either doesn't exist or is empty
* we use this function to check the new data directory and
@@ -244,6 +248,19 @@ is_pg_dir(char *dir)
bool
create_pg_dir(char *dir, bool force)
{
return _create_pg_dir(dir, force, false);
}
bool
create_witness_pg_dir(char *dir, bool force)
{
return _create_pg_dir(dir, force, true);
}
static bool
_create_pg_dir(char *dir, bool force, bool for_witness)
{
bool pg_dir = false;
@@ -280,12 +297,24 @@ create_pg_dir(char *dir, bool force)
pg_dir = is_pg_dir(dir);
/*
* we use force to reduce the time needed to restore a node which
* turn async after a failover or anything else
*/
if (pg_dir && force)
{
/*
* The witness server does not store any data other than a copy of the
* repmgr metadata, so in --force mode we can simply overwrite the
* directory.
*
* For non-witness servers, we'll leave the data in place, both to reduce
* the risk of unintentional data loss and to make it possible for the
* data directory to be brought up-to-date with rsync.
*/
if (for_witness)
{
log_notice(_("deleting existing data directory \"%s\"\n"), dir);
nftw(dir, unlink_dir_callback, 64, FTW_DEPTH | FTW_PHYS);
}
/* Let it continue */
break;
}
@@ -307,3 +336,14 @@ create_pg_dir(char *dir, bool force)
}
return true;
}
static int
unlink_dir_callback(const char *fpath, const struct stat *sb, int typeflag, struct FTW *ftwbuf)
{
int rv = remove(fpath);
if (rv)
perror(fpath);
return rv;
}