Ian Barwick c6ca183247 Convert configuration file parsing to use flex ...

Previously, repmgr was using a very simple ad-hoc string-based parser,
which had various limitations and allowed configuration files to be
created in a way which could cause confusion and/or unexpected
behaviour.

For example, it accepted strings enclosed in single quotes, but treated
strings enclosed in double quotes literally. A node_name defined thusly:

    node_name="somenode"

would result in the literal value '"somenode"' being used, which could
lead to unobvious errors along the lines of:

    no record found for ""somenode""

The configuration file parser has been adapted from the one used by
PostgreSQL itself, so behaves more-or-less identically (though some
functions such as file inclusion are not supported in repmgr).

This makes configuration parsing more robust and consistent;
additionally, error reporting will be more precise.

Note this does mean that some repmgr.conf items previously accepted
as valid by repmgr will now be rejected; in particular this includes
strings containing spaces which are not enclosed in single quotes.

2019-07-03 12:18:01 +09:00

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