$ git clone -n https://src.fedoraproject.org/rpms/g4music.git /var/lib/mock/f41-build-side-1-2635859-26164/root/chroot_tmpdir/scmroot/g4music
Cloning into '/var/lib/mock/f41-build-side-1-2635859-26164/root/chroot_tmpdir/scmroot/g4music'...
$ git fetch origin f17f4781cfd6c6c514d9c6787048f4ad774291cd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/g4music
 * [new ref]         f17f4781cfd6c6c514d9c6787048f4ad774291cd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f17f478 Version 3.9.1