git gc executionīehind the scenes git gc actually executes a bundle of other internal subcommands like git prune, git repack, git pack and git rerere.
It sets how long a stale working tree will be preserved before being deleted. Optional variable that defaults to "3 months ago". These values will help clarify the rest of git gc responsibility. What does git gc actually do?īefore execution, git gc first checks several git configvalues. git/objects/pack directory within a repository.
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Packs are like zip files of Git bjects and live in the. When Git identifies a group of similar objects it will compress them into a 'pack'. In addition to detached commit clean up, git gc will also perform compression on stored Git Objects, freeing up precious disk space. A detached commit can still be checked out, cherry picked, and examined through the git log. In an effort to preserve history and avoid data loss Git will not delete detached commits. Git commits can become inaccessible when performing history altering commands like git resets or git rebase. One type of Git garbage is orphaned or inaccessible commits. Git repositories accumulate various types of garbage.
Garbage collection in interpreted languages is used to recover memory that has become inaccessible to the executing program. Garbage collection is a concept that originates from interpreted programming languages which do dynamic memory allocation. Executing git gc is literally telling Git to clean up the mess it's made in the current repository. The git gc command is a repository maintenance command.