$ git clone -n https://src.fedoraproject.org/rpms/toolbox.git /var/lib/mock/f39-build-1772278-41502/root/chroot_tmpdir/scmroot/toolbox
Cloning into '/var/lib/mock/f39-build-1772278-41502/root/chroot_tmpdir/scmroot/toolbox'...
$ git fetch origin a8d29ef83f5168deab4bf958f608aa27036ae6df:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/toolbox
 * [new ref]         a8d29ef83f5168deab4bf958f608aa27036ae6df -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a8d29ef Silence 'rpminspect --tests=runpath' on i686