$ git clone -n https://src.fedoraproject.org/rpms/xgap.git /var/lib/mock/f40-build-804779-144613/root/chroot_tmpdir/scmroot/xgap
Cloning into '/var/lib/mock/f40-build-804779-144613/root/chroot_tmpdir/scmroot/xgap'...
$ git fetch origin f6a65f282e61f00ff6872b26a7be702732afbb59:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xgap
 * [new ref]         f6a65f282e61f00ff6872b26a7be702732afbb59 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f6a65f2 Remove incompatible-pointer patch for F40