$ git clone -n https://src.fedoraproject.org/rpms/kf6-purpose.git /var/lib/mock/f42-build-863393-171674/root/chroot_tmpdir/scmroot/kf6-purpose
Cloning into '/var/lib/mock/f42-build-863393-171674/root/chroot_tmpdir/scmroot/kf6-purpose'...
$ git fetch origin b0361d7caa284ad714b3270e7a80e7b120d0b6dd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-purpose
 * [new ref]         b0361d7caa284ad714b3270e7a80e7b120d0b6dd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b0361d7 Frameworks 6.9