Create instructions for Git + Python on Windows

[aaaaalbert]

Our buildscripts require Python and Git to work together. Setting up these on Windows can be tricky, especially regarding how / where Python is added to the $PATH environment variable, is / isn't installed for all users, and so on.

We should perhaps find one or two simple, standardized use cases that we document in a step-by-step tutorial.

[aaaaalbert]

@wecsam, given your Windows shell skills, do you want to take a stab at this issue?

[wecsam]

@aaaaalbert Sure, I'll take a look. Where are the existing buildscripts?

[aaaaalbert]

Cool! The build scripts are here, https://github.com/SeattleTestbed/buildscripts/ . The build instructions are here, https://github.com/SeattleTestbed/docs/blob/master/Contributing/BuildInstructions.md .

There are three issues as far as I can see:

• Python on Windows needs some extra care so that it sets up all PATHs correctly and can be started from the command line. Otherwise, we cannot run Repy.
• Python must also run from within git-bash (which seems to be the most popular way to have a Git CLI on Windows). Otherwise it's a pain to check out all dependencies and build Seattle components for later use (e.g. repy_v2 and seash).
• Related to this, the build scripts must be able to call git. On Unixoid systems, we use Popen, but again there seem to be path issues on Windows.

So we will need Windows-aware installation instructions that make the components work together, and perhaps modifications to the buildscripts too.

[wecsam]

Unlike writing a command to loop through some files, that's not something that I'll be able to do in two minutes. I'll revisit this after final exams.

[aaaaalbert]

Thank you, much appreciated!