New PostgreSQL Buildfarm Client Release

I have just released version 4.15 of the PostgreSQL Buildfarm Client. Here's what's changed:

• support the new location for pg_upgrade
• support running tests of client programs
• support building, installing and running testmodules
• use a default ccache directory
• improve logging when running pg_upgrade tests
• handle odd location of Python3 regression tests
• add timestamp to default log_line_prefix
• make qw() errors in the config file fatal (helps detect errors)
• minor bug fixes for web script settings.
• allow for using linked git directories in non-master branches

The last item might need a little explanation.  Essentially this can reduce quite dramatically the amount of space required if you are building on more than one branch. Instead of keeping, say, 6 checked out repos for the current six tested branches, we keep one and link all the others to it. This works almost exactly the way git-new-workdir does (I stole the logic from there). This doesn't work in a couple of situations: if you are using Windows or if you are using git-reference. In these cases the new setting is simply ignored.

To enable this new setting in an existing installation, do the following after installing the new release:

• in your config file, add this setting:
  git_use_workdirs => 1,
• remove the pgsql directory in each branch directory other than HEAD

Another good thing to do in existing installations would be to add "%m" to the beginning of the log_line_prefix setting in extra_config stanza.

Enjoy!