Buildfarm client version 4.15 released

I have just released version 4.15 of the PostgreSQL Buildfarm Client
<http://www.pgbuildfarm.org/downloads/releases/build-farm-4_15.tgz>. It
can be downloaded at
<http://www.pgbuildfarm.org/downloads/releases/build-farm-4_15.tgz>

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!

cheers

andrew