$ git clone -n https://src.fedoraproject.org/rpms/ghc-stringbuilder.git /var/lib/mock/f38-build-side-42-init-devel-917799-28734/root/chroot_tmpdir/scmroot/ghc-stringbuilder
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-917799-28734/root/chroot_tmpdir/scmroot/ghc-stringbuilder'...
$ git fetch origin 8d9d3394a2eb63d771935a557fb854433dbdfa1a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-stringbuilder
 * [new ref]         8d9d3394a2eb63d771935a557fb854433dbdfa1a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8d9d339 Convert to %autorelease and %autochangelog