$ git clone -n https://src.fedoraproject.org/rpms/kf6-kservice.git /var/lib/mock/f42-build-side-1-3573597-46768/root/chroot_tmpdir/scmroot/kf6-kservice
Cloning into '/var/lib/mock/f42-build-side-1-3573597-46768/root/chroot_tmpdir/scmroot/kf6-kservice'...
$ git fetch origin bdd2924dbda49a9aaf1e10280dbd68dbafc75a50:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kservice
 * [new ref]         bdd2924dbda49a9aaf1e10280dbd68dbafc75a50 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bdd2924 6.15 and plasma 3.4 compatibility rebuild