Has anyone experience with this setup: install your software in a git repository. That way you can say something like "version=1.23" on top of the control file

Has anyone experience with this setup: install your software in a git repository. That way you can say something like "version=1.23" on top of the control file (such as a sourcecode file for a scripting language) and the software system checks out that particular version which is on your hard drive. There are obvious drawbacks of the system as where to install the intermediate working directory, but there might be solutions for these problems. That way updates may be much less hassle. If you have for example a python script on your server running doing important things, an update to python might break the script and could cause some trouble. But if you could say for example "uses python=x.y" and the system silently falls back to that version even if a newer version of pyhton is installed, the script is more likely to keep running even on upgrades.