$ git clone -n https://src.fedoraproject.org/rpms/g4music.git /var/lib/mock/f41-build-side-1-3126801-39526/root/chroot_tmpdir/scmroot/g4music
Cloning into '/var/lib/mock/f41-build-side-1-3126801-39526/root/chroot_tmpdir/scmroot/g4music'...
$ git fetch origin 2e3d77b1efcf8fe2d8dd7d680985ab75a386aa75:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/g4music
 * [new ref]         2e3d77b1efcf8fe2d8dd7d680985ab75a386aa75 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2e3d77b Version 4.2