$ git clone -n https://src.fedoraproject.org/rpms/ghc-wai.git /var/lib/mock/f38-build-side-42-init-devel-745686-27658/root/chroot_tmpdir/scmroot/ghc-wai
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-745686-27658/root/chroot_tmpdir/scmroot/ghc-wai'...
$ git fetch origin 8fc8f7eb1c915ce0df3376d75079327330d3fe78:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-wai
 * [new ref]         8fc8f7eb1c915ce0df3376d75079327330d3fe78 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8fc8f7e Convert to %autorelease and %autochangelog