$ git clone -n https://src.fedoraproject.org/rpms/kf6-kbookmarks.git /var/lib/mock/f42-build-862140-170665/root/chroot_tmpdir/scmroot/kf6-kbookmarks
Cloning into '/var/lib/mock/f42-build-862140-170665/root/chroot_tmpdir/scmroot/kf6-kbookmarks'...
$ git fetch origin 12742f1239a821d45efb75dbc9238d36b91ab1de:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kbookmarks
 * [new ref]         12742f1239a821d45efb75dbc9238d36b91ab1de -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 12742f1 6.8.0