-Does something not yet documented.
-
-
-OPTIONS
--------
---option::
- Some option not yet documented.
-
-<args>...::
- Some argument not yet documented.
+Acts as a filter, extracting the commit ID stored in archives created by
+git-tar-tree. 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-tar-tree or if the first parameter of git-tar-tree had been
+a tree ID instead of a commit ID or tag.