$ git clone -n https://src.fedoraproject.org/rpms/ghc-tagged.git /var/lib/mock/f38-build-side-42-init-devel-745549-27658/root/chroot_tmpdir/scmroot/ghc-tagged
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-745549-27658/root/chroot_tmpdir/scmroot/ghc-tagged'...
$ git fetch origin 8c130f30793ddfa0dd6b662fcc429b6c6305035e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-tagged
 * [new ref]         8c130f30793ddfa0dd6b662fcc429b6c6305035e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8c130f3 Convert to %autorelease and %autochangelog