$ git clone -n https://src.fedoraproject.org/rpms/pie.git /var/lib/mock/f42-build-side-1-3583024-46887/root/chroot_tmpdir/scmroot/pie
Cloning into '/var/lib/mock/f42-build-side-1-3583024-46887/root/chroot_tmpdir/scmroot/pie'...
$ git fetch origin b631897760b728865a8e2d86025fb6ed37752322:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pie
 * [new ref]         b631897760b728865a8e2d86025fb6ed37752322 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b631897 v1.0.0