What's wrong with a continuous integration script in bash? A basic CI script just has to check source control periodically, run the build (make or something sim

What's wrong with a continuous integration script in bash? A basic CI script just has to check source control periodically, run the build (make or something similar) and notify anyone if there's an error and maybe publish the result somewhere. I've done similar with the far less capable batch files. Sure it's not as great as a full on CI server, but it doesn't require the same investment either. For my personal projects I have bash scripts to handle basic CI (compiling and testing), given a bit of time I think I could string cron, make, bash and m4 into a CI server that fits 90%+ of my needs.