$ git clone -n https://src.fedoraproject.org/rpms/ghc-split.git /var/lib/mock/f40-build-1998336-44230/root/chroot_tmpdir/scmroot/ghc-split
Cloning into '/var/lib/mock/f40-build-1998336-44230/root/chroot_tmpdir/scmroot/ghc-split'...
$ git fetch origin 9fcecf91d03ca844089805aa7c3dee303e6bcdc7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-split
 * [new ref]         9fcecf91d03ca844089805aa7c3dee303e6bcdc7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9fcecf9 bump release