$ git clone -n https://src.fedoraproject.org/rpms/python-can.git /var/lib/mock/f40-build-2058818-49150/root/chroot_tmpdir/scmroot/python-can
Cloning into '/var/lib/mock/f40-build-2058818-49150/root/chroot_tmpdir/scmroot/python-can'...
$ git fetch origin 8fed04c5999aeb749f0da818f8ff824317eb8177:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-can
 * [new ref]         8fed04c5999aeb749f0da818f8ff824317eb8177 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8fed04c 4.3.1