call git as subprocess instead of using the git python API
-rw-r--r-- 6 .gitignore
-rw-r--r-- 18092 COPYING
-rw-r--r-- 5740 build_system.py
-rw-r--r-- 1329 mass-build.conf.kde.sample
-rwxr-xr-x 6855 mass_build.py
-rw-r--r-- 4689 vcs.py