$ git clone -n https://src.fedoraproject.org/rpms/lilypond.git /var/lib/mock/f42-build-side-1-3501290-45974/root/chroot_tmpdir/scmroot/lilypond
Cloning into '/var/lib/mock/f42-build-side-1-3501290-45974/root/chroot_tmpdir/scmroot/lilypond'...
$ git fetch origin 6fc1f660891f3965f5903561bfb0bc6cf2420221:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lilypond
 * [new ref]         6fc1f660891f3965f5903561bfb0bc6cf2420221 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6fc1f66 2.25.25