$ git clone -n https://src.fedoraproject.org/rpms/toxcore.git /var/lib/mock/f40-build-795559-140206/root/chroot_tmpdir/scmroot/toxcore
Cloning into '/var/lib/mock/f40-build-795559-140206/root/chroot_tmpdir/scmroot/toxcore'...
$ git fetch origin e4f1ce0decf15a84af5b815364d7dbcf29f72e45:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/toxcore
 * [new ref]         e4f1ce0decf15a84af5b815364d7dbcf29f72e45 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e4f1ce0 Rebuild for libvpx 1.14.x