Friday, August 26, 2016

Local^wBitbucket Pipelines

So a while ago Bitbucket started a Beta program from a new feature called Pipelines, or more appropriately, Bitbucket Pipelines.  Being interested in CI/CD I of course submitted an application right away.  I was accepted, but then found out it only had support for Git.

As you may or may not know, I'm not really a big fan of Git (that flamewar is for another time and place) and prefer Mercurial.  So much so that nearly all of the 300ish repositories I have access to on Bitbucket are Mercurial.  So I was dead in the water and couldn't do anything.

Fast forward a few months and Bitbucket added Mercurial support to Pipelines. SCORE!

I started adding Pipelines support to one of my more simple projects and unfortunately found it extremely tedious to have to push to Bitbucket every time to see if I fixed the build.  So, like any good Open Source developer, I started working on a solution.

Pipelines is built on top of Docker and uses a YAML file to describe how the build works.  I've been using Docker for very long time now (I gave a talk on it in August 2014 for anyone that's curious) so I'm very comfortable with it.  That said, all I really needed to do was take the YAML file and turn it into some docker run commands.

So after a few hours of work I had a working version of what I later named local-pipelines.

It sat that way for awhile until Sean Farley ran into the same issues I did with not being able to test until pushing.  He then proceeded to clean the VCS interaction code and added support for passing environment variables into the pipeline.  His work got me working on it again too so I finally cleaned up the documentation and got it uploaded to pypi.

You can find more information on the overview page or if you're using MacPorts you can find it there as well.

Building libpurple3 on OSX with homebrew

I've spent a far amount of time this week working on making it easier (or even possible in some cases) to build libpurple3 on OSX.  I haven't gotten to Gtk+ yet, so I haven't even tried compiling Pidgin yet.

Typically OSX isn't one of first party supported platforms, but I'm on vacation this week and only have a MacBook at my immediate disposal.  So here we are ;)

Most of the issues have been in the generation of the configure script and landed in PR #103.  But there was a side effect from an earlier PR that became a problem on OSX since homebrew does not have farstream.  PR #107 has been submitted to fix that.

When PR #107 is merged everything should be buildable.  But it does not and will not work out of the box.  Why you ask? Politics!  (of course...)

Homebrew attempts to play things very safe, which is admirable, but a giant pain when you're actually trying to compile something that isn't already in Homebrew.  So we go about making this easier by using a little known feature of Pidgin's build system.

Years ago I got tired of trying to remember what arguments I was passing to and configure.  So like any programmer, I added code that would do it for me!  That code sources a shell script named autogen.args from the directory you invoke from.  So in the root of my build directory I have a file named autogen.args with the following content:

export PKG_CONFIG_PATH=$(brew --prefix libffi)/lib/pkgconfig:$(brew --prefix libxml2)/lib/pkgconfig
CONFIGURE_FLAGS="--disable-gtkui --disable-consoleui --disable-vv --disable-kwallet --disable-meanwhile --disable-avahi --disable-dbus --disable-gnome-keyring --enable-introspection"
As you can see, I'm disabling a ton of stuff to make this build work, but that's not all.  Notice the PKG_CONFIG_PATH environment variable being exported.  This is dealing with Homebrew's policy of staying out of the system's way.  OSX has it's own version of libffi and libxml2 so Homebrew will not install any part of those packages where the system will look for them.  This has the unfortunate side effect of causing weird build failures until you realize this is the problem.

At any rate, I hope this has been helpful to someone :)