$ git clone -n https://src.fedoraproject.org/rpms/ghc-constraints.git /var/lib/mock/f38-build-side-42-init-devel-941658-28757/root/chroot_tmpdir/scmroot/ghc-constraints
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-941658-28757/root/chroot_tmpdir/scmroot/ghc-constraints'...
$ git fetch origin 06c96dc4344d317ec82cc46410cf93c8655da36c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-constraints
 * [new ref]         06c96dc4344d317ec82cc46410cf93c8655da36c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 06c96dc move type-equality here from ghc-shelly