This being hardcoded isn't the best. Inferring it is possible but also sucks:

 - for people hacking on spark they'll have a full blown git checkout, and to figure out the SHA they'd either hardcode it to something, or you'd want to execute a `git rev-parse HEAD` to figure out the SHA. No guarantees it would be on packserv anyways
 - for people running autospark inside starscream the packserv compile script puts a `GIT_SHA` file in the root with the sha the package was compiled with, so `starscream/spark/current/GIT_SHA` would have the sha in question handy.

:/