$ git clone -n https://src.fedoraproject.org/rpms/kernelshark.git /var/lib/mock/f40-build-2241538-53664/root/chroot_tmpdir/scmroot/kernelshark
Cloning into '/var/lib/mock/f40-build-2241538-53664/root/chroot_tmpdir/scmroot/kernelshark'...
$ git fetch origin 7df24c87f042fa52e6d6785e75a091d8001e19b3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kernelshark
 * [new ref]         7df24c87f042fa52e6d6785e75a091d8001e19b3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7df24c8 Update to 2.3.0