$ git clone -n https://src.fedoraproject.org/rpms/rust-test-case.git /var/lib/mock/f38-build-side-43-rust-devel-1410672-31421/root/chroot_tmpdir/scmroot/rust-test-case
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1410672-31421/root/chroot_tmpdir/scmroot/rust-test-case'...
$ git fetch origin 25cced970b8339fd57677b1b5d36e35dedf72a15:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-test-case
 * [new ref]         25cced970b8339fd57677b1b5d36e35dedf72a15 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 25cced9 Update to version 2.2.2