$ git clone -n https://src.fedoraproject.org/rpms/signon.git /var/lib/mock/f40-build-2157758-50936/root/chroot_tmpdir/scmroot/signon
Cloning into '/var/lib/mock/f40-build-2157758-50936/root/chroot_tmpdir/scmroot/signon'...
$ git fetch origin 5fd21cebeb5b9645d115137ac7e8357ce5bf9f0f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/signon
 * [new ref]         5fd21cebeb5b9645d115137ac7e8357ce5bf9f0f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5fd21ce Remove stale comments and patches