I have a shell script that trims old history on a cronjob. This is for
a repo that is used to track reports that have limited "life" (like
logs). Old history is trimmed with grafts pointing to an empty "root"
commit.

Right now, info/graft grows unbound. I am looking for a way to trim
unreachable grafts, I would like to be able to say something like:

 git is-reachable treeish

Grepping through docs and existing code hasn't helped, but perhaps I'm
missing something obvious...

This repository has a couple hundred branches (one per server
tracked). For a single branch, I can picture a relatively easy
approach with git merge-base.

thanks!



m
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