$ git clone -n https://src.fedoraproject.org/rpms/ghc-http-common.git /var/lib/mock/f41-build-839098-159992/root/chroot_tmpdir/scmroot/ghc-http-common
Cloning into '/var/lib/mock/f41-build-839098-159992/root/chroot_tmpdir/scmroot/ghc-http-common'...
$ git fetch origin e43e8d690773b0dc18b355cafc1ee6b3e5197fa6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-http-common
 * [new ref]         e43e8d690773b0dc18b355cafc1ee6b3e5197fa6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e43e8d6 bump release