$ git clone -n https://src.fedoraproject.org/rpms/golang-github-wi2l-jettison.git /var/lib/mock/f40-build-2002491-44721/root/chroot_tmpdir/scmroot/golang-github-wi2l-jettison
Cloning into '/var/lib/mock/f40-build-2002491-44721/root/chroot_tmpdir/scmroot/golang-github-wi2l-jettison'...
$ git fetch origin 231756cc2a0fb9ee71a486b12617f28511cb26db:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-wi2l-jettison
 * [new ref]         231756cc2a0fb9ee71a486b12617f28511cb26db -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 231756c Initial import