$ git clone -n https://src.fedoraproject.org/rpms/python-sphinxcontrib-github-alt.git /var/lib/mock/f42-build-3408478-45145/root/chroot_tmpdir/scmroot/python-sphinxcontrib-github-alt
Cloning into '/var/lib/mock/f42-build-3408478-45145/root/chroot_tmpdir/scmroot/python-sphinxcontrib-github-alt'...
$ git fetch origin e3ce25ca0fc3c5831e78cc4d9658487d5db25c99:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-sphinxcontrib-github-alt
 * [new ref]         e3ce25ca0fc3c5831e78cc4d9658487d5db25c99 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e3ce25c Orphaned for 6+ weeks