$ git clone -n https://src.fedoraproject.org/rpms/google-benchmark.git /var/lib/mock/f40-build-1932371-25124/root/chroot_tmpdir/scmroot/google-benchmark
Cloning into '/var/lib/mock/f40-build-1932371-25124/root/chroot_tmpdir/scmroot/google-benchmark'...
$ git fetch origin dc03b903293a2cb1e727bc7798282015427ecb49:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/google-benchmark
 * [new ref]         dc03b903293a2cb1e727bc7798282015427ecb49 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dc03b90 Updated to version 1.8.5.