$ git clone -n https://src.fedoraproject.org/rpms/stellarium.git /var/lib/mock/f39-build-1881470-42761/root/chroot_tmpdir/scmroot/stellarium
Cloning into '/var/lib/mock/f39-build-1881470-42761/root/chroot_tmpdir/scmroot/stellarium'...
$ git fetch origin bec08d58fa86c13e069366b244d0cec71071c8a0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/stellarium
 * [new ref]         bec08d58fa86c13e069366b244d0cec71071c8a0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bec08d5 Rebuild (qt6)