$ git clone -n https://src.fedoraproject.org/rpms/python-nbsphinx.git /var/lib/mock/f40-build-2426197-60598/root/chroot_tmpdir/scmroot/python-nbsphinx
Cloning into '/var/lib/mock/f40-build-2426197-60598/root/chroot_tmpdir/scmroot/python-nbsphinx'...
$ git fetch origin 6c87fc19a966afa497dd5d4c5486280d3dfd80c0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-nbsphinx
 * [new ref]         6c87fc19a966afa497dd5d4c5486280d3dfd80c0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6c87fc1 Convert to %autorelease and %autochangelog