From 3.1.4 `repmgr` will behave like other PostgreSQL utilities
when handling database connection parameters, in particular
accepting a conninfo string and honouring libpq connection defaults.
Removed the existing keyword array which has a fixed, limited number
of parameters and replace it with a dynamic array which can be
used to store as many parameters as reported by libpq.
repmgr disallows socket connections anyway (the whole point of providing
the host is to connect to a remote machine) so don't show that as
a fallback default in the -?/--help output.
This matches the behaviour of other PostgreSQL utilities such as pg_basebackup,
psql et al.
Note that unlike psql, but like pg_basebackup, repmgr does not accept a
"left-over" parameter as a conninfo string; this could be added later.
Parameters specified in the conninfo string will override any parameters
supplied correcly (e.g. `-d "host=foo"` will override `-h bar`).
Having successfully connected to the primary, we can use the actual parameters
reported by libpq to create "primary_conninfo", rather than the limited
subset previously defined by repmgr. Assuming that the user can
pass a conninfo string to repmgr (see following commit), this makes it
possible to provide other connection parameters, e.g. related to
SSL usage.
This commit introduces three new options:
- start_command
- stop_command
- restart_command
If these are set, repmgr will issue the specified command instead
of the default pg_ctl commands
If the pidfile is still there after apparent shutdown, or we're
unable to access the server at all, something has gone wrong and
the switchover should be aborted.
If a connection attempt fails, keep pinging the server until it
finally away, or the timeout kicks in.
Addresses issue reported in GitHub #188 and previously noted in
repmgr.c
This enables the switchover operation to function if the remote server
(current primary) has a different binary directory to the current
server, and addresses the issue reported in GitHub #172.
Otherwise the monitoring table's 'last_wal_standby_location' will stay at
the location of the last streaming WAL received.
This complements the bugfix applied in e814c1120e.
