What you ask for already exists: it's called the tree hash (which can be obtained by doing `git log -n1 --pretty="%T"`). The tree hash is unaffected by history,

What you ask for already exists: it's called the tree hash (which can be obtained by doing `git log -n1 --pretty="%T"`). The tree hash is unaffected by history, so if you for instance revert a commit, the tree hash will also revert. IIRC Julia uses tree hashes rather than commit hashes to track its packages.