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"standby clone": cowardly refuse to clone into an active data directory

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By checking the PID file in the same way pg_ctl does, we can be pretty
much certain whether the target data directory contains an active
PostgreSQL instance.
This commit is contained in:
Ian Barwick
2018-02-07 23:27:45 +09:00
committed by Ian Barwick
parent c7dfe9e040
commit 871d6fdee3
3 changed files with 167 additions and 59 deletions
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45
repmgr-action-standby.c
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@@ -220,6 +220,49 @@ do_standby_clone(void)
param_set(&recovery_conninfo, "application_name", "repmgr");
}
/*
* Do some sanity checks on the proposed data directory; if it exists:
* - check it's openable
* - check if there's an instance running
*
* We do this here so the check can be part of a --dry-run.
*/
switch (check_dir(local_data_directory))
{
case DIR_ERROR:
log_error(_("unable to access specified data directory \"%s\""), local_data_directory);
log_detail("%s", strerror(errno));
exit(ERR_BAD_CONFIG);
break;
case DIR_NOENT:
/*
* directory doesn't exist
* TODO: in --dry-run mode, attempt to create and delete?
*/
break;
case DIR_EMPTY:
/* Present but empty */
break;
case DIR_NOT_EMPTY:
/* Present but not empty */
if (is_pg_dir(local_data_directory))
{
/* even -F/--force is not enough to overwrite an active directory... */
if (is_pg_running(local_data_directory))
{
log_error(_("specified data directory \"%s\" appears to contain a running PostgreSQL instance"),
local_data_directory);
log_hint(_("ensure the target data directory does not contain a running PostgreSQL instance"));
exit(ERR_BAD_CONFIG);
}
}
break;
default:
break;
}
/*
* By default attempt to connect to the source node. This will fail if no
* connection is possible, unless in Barman mode, in which case we can
@@ -279,6 +322,7 @@ do_standby_clone(void)
exit(ERR_BAD_CONFIG);
}
if (upstream_conninfo_found == true)
{
/*
@@ -451,6 +495,7 @@ do_standby_clone(void)
PQfinish(superuser_conn);
}
if (runtime_options.dry_run == true)
{
if (upstream_node_id != UNKNOWN_NODE_ID)