$ git clone -n https://src.fedoraproject.org/rpms/c4core.git /var/lib/mock/f41-build-847328-163983/root/chroot_tmpdir/scmroot/c4core
Cloning into '/var/lib/mock/f41-build-847328-163983/root/chroot_tmpdir/scmroot/c4core'...
$ git fetch origin cc646733f7c7b8fb2eb1140b18e3f46c0cd0db2a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/c4core
 * [new ref]         cc646733f7c7b8fb2eb1140b18e3f46c0cd0db2a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cc64673 Build as C++14 to match the rapidyaml package