$ git clone -n https://src.fedoraproject.org/rpms/kf6-kbookmarks.git /var/lib/mock/f42-build-863346-171641/root/chroot_tmpdir/scmroot/kf6-kbookmarks
Cloning into '/var/lib/mock/f42-build-863346-171641/root/chroot_tmpdir/scmroot/kf6-kbookmarks'...
$ git fetch origin 700ae2e5a7a556d27e6ddda2e5e28301fb91d936:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kbookmarks
 * [new ref]         700ae2e5a7a556d27e6ddda2e5e28301fb91d936 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 700ae2e Frameworks 6.9