$ git clone -n https://src.fedoraproject.org/rpms/ghc-system-fileio.git /var/lib/mock/f38-build-side-42-init-devel-917809-28734/root/chroot_tmpdir/scmroot/ghc-system-fileio
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-917809-28734/root/chroot_tmpdir/scmroot/ghc-system-fileio'...
$ git fetch origin a4bac680d45115e1c73cb04211cbca8940dbd713:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-system-fileio
 * [new ref]         a4bac680d45115e1c73cb04211cbca8940dbd713 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a4bac68 Convert to %autorelease and %autochangelog