$ git clone -n https://src.fedoraproject.org/rpms/phd2.git /var/lib/mock/f40-build-2248818-53964/root/chroot_tmpdir/scmroot/phd2
Cloning into '/var/lib/mock/f40-build-2248818-53964/root/chroot_tmpdir/scmroot/phd2'...
$ git fetch origin 77e6896cf6b8398cb60a516b399d8606cd01e48a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/phd2
 * [new ref]         77e6896cf6b8398cb60a516b399d8606cd01e48a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 77e6896 Update to 2.6.13 (fedora#2255705)