$ git clone -n https://src.fedoraproject.org/rpms/ghc-sandi.git /var/lib/mock/f39-build-1712677-41228/root/chroot_tmpdir/scmroot/ghc-sandi
Cloning into '/var/lib/mock/f39-build-1712677-41228/root/chroot_tmpdir/scmroot/ghc-sandi'...
$ git fetch origin e8511700fea81289ed367c8ff111d017fc6a6071:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-sandi
 * [new ref]         e8511700fea81289ed367c8ff111d017fc6a6071 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e851170 bump release