$ git clone -n https://src.fedoraproject.org/rpms/g4music.git /var/lib/mock/f42-build-887426-188286/root/chroot_tmpdir/scmroot/g4music
Cloning into '/var/lib/mock/f42-build-887426-188286/root/chroot_tmpdir/scmroot/g4music'...
$ git fetch origin c54b421376be1a5069d6925d8724667536f7add0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/g4music
 * [new ref]         c54b421376be1a5069d6925d8724667536f7add0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c54b421 Version 4.3.1