$ git clone -n https://src.fedoraproject.org/rpms/golang-github-facebook-time.git /var/lib/mock/f40-build-1947298-25184/root/chroot_tmpdir/scmroot/golang-github-facebook-time
Cloning into '/var/lib/mock/f40-build-1947298-25184/root/chroot_tmpdir/scmroot/golang-github-facebook-time'...
$ git fetch origin 9a53a878677de7b76689995b554b168009a97472:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-facebook-time
 * [new ref]         9a53a878677de7b76689995b554b168009a97472 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9a53a87 Update README.md