$ git clone -n https://src.fedoraproject.org/rpms/ghc-HSH.git /var/lib/mock/f41-build-side-1-2811398-32930/root/chroot_tmpdir/scmroot/ghc-HSH
Cloning into '/var/lib/mock/f41-build-side-1-2811398-32930/root/chroot_tmpdir/scmroot/ghc-HSH'...
$ git fetch origin 35d46648b339906136f498a94a861264ae779aaa:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-HSH
 * [new ref]         35d46648b339906136f498a94a861264ae779aaa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 35d4664 patch openFd has 1 less parameter