$ git clone -n https://src.fedoraproject.org/rpms/pcp.git /var/lib/mock/f41-build-side-1-3070203-38790/root/chroot_tmpdir/scmroot/pcp
Cloning into '/var/lib/mock/f41-build-side-1-3070203-38790/root/chroot_tmpdir/scmroot/pcp'...
$ git fetch origin c930e592ccf44c00dad4ad5872840e77f845dbff:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pcp
 * [new ref]         c930e592ccf44c00dad4ad5872840e77f845dbff -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c930e59 Update to latest community sources