$ git clone -n https://src.fedoraproject.org/rpms/gir-to-d.git /var/lib/mock/f40-build-798434-141898/root/chroot_tmpdir/scmroot/gir-to-d
Cloning into '/var/lib/mock/f40-build-798434-141898/root/chroot_tmpdir/scmroot/gir-to-d'...
$ git fetch origin 4020f85a4389a8eab6516f745ef2e23825ce554f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gir-to-d
 * [new ref]         4020f85a4389a8eab6516f745ef2e23825ce554f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4020f85 Update to 0.23.2