$ git clone -n https://src.fedoraproject.org/rpms/kf6-qqc2-desktop-style.git /var/lib/mock/f42-build-side-1-3573619-46768/root/chroot_tmpdir/scmroot/kf6-qqc2-desktop-style
Cloning into '/var/lib/mock/f42-build-side-1-3573619-46768/root/chroot_tmpdir/scmroot/kf6-qqc2-desktop-style'...
$ git fetch origin 3df87faa677c28dac97776a183c3c4a588dc12a9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-qqc2-desktop-style
 * [new ref]         3df87faa677c28dac97776a183c3c4a588dc12a9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3df87fa 6.15 and plasma 3.4 compatibility rebuild