Worried about people deleting git repos?
Want to ensure you've got a local copy?
This will do a passable job at solving the problem!
The latest version converts insecure git:// URLs into https:// at clone time. But you might already have a bunch of existing repos with now-unsupported URLs in them.
$ sed -i.bak "s,git://github.com,https://github.com,g" */*/config