$ git clone -n https://src.fedoraproject.org/rpms/GoldenCheetah.git /var/lib/mock/f39-build-1970141-43320/root/chroot_tmpdir/scmroot/GoldenCheetah
Cloning into '/var/lib/mock/f39-build-1970141-43320/root/chroot_tmpdir/scmroot/GoldenCheetah'...
$ git fetch origin b63d928fe74229b7d00fdf45fd307a4200b454a0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/GoldenCheetah
 * [new ref]         b63d928fe74229b7d00fdf45fd307a4200b454a0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b63d928 Update to 3.6-1