$ git clone -n https://src.fedoraproject.org/rpms/ghc-contravariant.git /var/lib/mock/f38-build-side-42-init-devel-665119-26646/root/chroot_tmpdir/scmroot/ghc-contravariant
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-665119-26646/root/chroot_tmpdir/scmroot/ghc-contravariant'...
$ git fetch origin 7557f633f9536370294a840b744a84005cd655c1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-contravariant
 * [new ref]         7557f633f9536370294a840b744a84005cd655c1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7557f63 Convert to %autorelease and %autochangelog