$ git clone -n https://src.fedoraproject.org/rpms/python-qt5.git /var/lib/mock/f42-build-side-1-3579933-46816/root/chroot_tmpdir/scmroot/python-qt5
Cloning into '/var/lib/mock/f42-build-side-1-3579933-46816/root/chroot_tmpdir/scmroot/python-qt5'...
$ git fetch origin c73fbe5f0c9026aea9265f900f1b67db195d3bd0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-qt5
 * [new ref]         c73fbe5f0c9026aea9265f900f1b67db195d3bd0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c73fbe5 Rebuild (qt5)