Initial commands

[ianthomas23]

As a guide to what we should work on initially, I think our use case should be one of someone learning git for the first time with a local repo (so no git clone or git fetch or git push yet). So something like:

cd some_dir
git init .
echo Hello > file.txt
git add file.txt
git status
git commit -a -m "Added some file"
git log
git checkout -b newbranch
echo blah blah >> file.txt
git commit -a -m "More words"
git log
git checkout main
git merge newbranch

This intentionally avoids the complexity of network access, accepting user input from stdin, and opening a separate editor. Eventually we will have to do these of course.

This workflow will require some git config so that there is a valid user name and email to associate with commits. This is awkward when used in cockle as there isn't a persisted home directory so writing to $HOME/.gitconfig won't work. Probably we can put the .gitconfig in the shared /drive directory so that it is persisted between sessions, so our implementation should be able to read a .gitconfig from an arbitrary directory, probably specified by an environment variable. I expect normal git supports some env var for this anyway so we just need to do the same?