$ git clone -n https://src.fedoraproject.org/rpms/ghc-pagure.git /var/lib/mock/f41-build-side-1-3103864-39363/root/chroot_tmpdir/scmroot/ghc-pagure
Cloning into '/var/lib/mock/f41-build-side-1-3103864-39363/root/chroot_tmpdir/scmroot/ghc-pagure'...
$ git fetch origin 3b924429b2f20f7deb178f451e3749ee6321bcc1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-pagure
 * [new ref]         3b924429b2f20f7deb178f451e3749ee6321bcc1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3b92442 Added the README