$ git clone -n https://src.fedoraproject.org/rpms/ghc-gi-glib.git /var/lib/mock/f40-build-800265-142890/root/chroot_tmpdir/scmroot/ghc-gi-glib
Cloning into '/var/lib/mock/f40-build-800265-142890/root/chroot_tmpdir/scmroot/ghc-gi-glib'...
$ git fetch origin d66110290ea686f3eaddbacf1b85b1b9b8f3b8c3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-gi-glib
 * [new ref]         d66110290ea686f3eaddbacf1b85b1b9b8f3b8c3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d661102 Add a temporary override to CFLAGS