$ git clone -n https://src.fedoraproject.org/rpms/rust-tar.git /var/lib/mock/f45-build-45315-822/root/chroot_tmpdir/scmroot/rust-tar
Cloning into '/var/lib/mock/f45-build-45315-822/root/chroot_tmpdir/scmroot/rust-tar'...
$ git fetch origin 6f51ddd021ff67b1d6ea8b534d5027dcb1550ae5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-tar
 * [new ref]         6f51ddd021ff67b1d6ea8b534d5027dcb1550ae5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6f51ddd Allow astral-tokio-tar 0.7 for testing