$ git clone -n https://src.fedoraproject.org/rpms/giac.git /var/lib/mock/f38-build-side-42-init-devel-606030-26249/root/chroot_tmpdir/scmroot/giac
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-606030-26249/root/chroot_tmpdir/scmroot/giac'...
$ git fetch origin 56dfbaef676a213455f17057b5cea02f4cd7148b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/giac
 * [new ref]         56dfbaef676a213455f17057b5cea02f4cd7148b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 56dfbae Update to 1.9.0 sub-37