git-get-tar-commit-id < <tarfile>


Acts as a filter, extracting the commit ID stored in archives created by gitlink:git-archive[1]. It reads only the first 1024 bytes of input, thus its runtime is not influenced by the size of <tarfile> very much.

If no commit ID is found, git-get-tar-commit-id quietly exists with a return code of 1. This can happen if <tarfile> had not been created using git-archive or if the first parameter of git-archive had been a tree ID instead of a commit ID or tag.


Written by Rene Scharfe <>


Documentation by Junio C Hamano and the git-list <>.


Part of the gitlink:git[7] suite