$ git clone -n https://src.fedoraproject.org/rpms/golang-github-google-cmp.git /var/lib/mock/f40-build-2198745-51704/root/chroot_tmpdir/scmroot/golang-github-google-cmp
Cloning into '/var/lib/mock/f40-build-2198745-51704/root/chroot_tmpdir/scmroot/golang-github-google-cmp'...
$ git fetch origin 6baea50edc26b0df2969272bbc55e0e2e7b42b2d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-google-cmp
 * [new ref]         6baea50edc26b0df2969272bbc55e0e2e7b42b2d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6baea50 Update to 0.6.0 - Closes rhbz#2243233