$ git clone -n https://src.fedoraproject.org/rpms/ghc-free.git /var/lib/mock/f39-build-2028102-47343/root/chroot_tmpdir/scmroot/ghc-free
Cloning into '/var/lib/mock/f39-build-2028102-47343/root/chroot_tmpdir/scmroot/ghc-free'...
$ git fetch origin d1a4de82b007df747e8785a865d9fb1e84fd8816:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-free
 * [new ref]         d1a4de82b007df747e8785a865d9fb1e84fd8816 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d1a4de8 bump release