$ git clone -n https://src.fedoraproject.org/forks/hypersa/rpms/ghc-pretty-show.git /var/lib/mock/f39-build-2218571-52612/root/chroot_tmpdir/scmroot/ghc-pretty-show
Cloning into '/var/lib/mock/f39-build-2218571-52612/root/chroot_tmpdir/scmroot/ghc-pretty-show'...
$ git fetch origin 32e61bc13c74dbc62e031d93e16a1c043e51b594:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/forks/hypersa/rpms/ghc-pretty-show
 * [new ref]         32e61bc13c74dbc62e031d93e16a1c043e51b594 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 32e61bc rv64 rebuild