Comment 5 for bug 1427160

Example preseed for setting swap size with volume groups

# Partitioning
d-i partman/early_command string debconf-set partman-auto/disk `list-devices disk | head -n1`
d-i partman-iscsi/mainmenu string finish
d-i partman-auto/method string regular
d-i partman-lvm/device_remove_lvm boolean true
d-i partman-lvm/confirm boolean true
d-i partman-md/device_remove_md boolean true
d-i partman/confirm_write_new_label boolean true
d-i partman-auto/method string lvm
d-i partman-lvm/device_remove_lvm_span boolean true
d-i partman-auto/purge_lvm_from_device boolean true
d-i partman-auto-lvm/new_vg_name string system
d-i partman-auto/expert_recipe string \
      test :: \
              285 10 286 ext4 \
                      $primary{ } $bootable{ } \
                      method{ format } format{ } \
                      use_filesystem{ } filesystem{ ext4 } \
                      mountpoint{ /boot } \
              . \
              11000 50 12000 ext4 \
                      $lvmok{} lv_name{ root } $defaultignore{ } \
                      method{ format } format{ } \
                      use_filesystem{ } filesystem{ ext4 } \
                      mountpoint{ / } \
              . \
             11000 15000 -1 ext4 \
                      $lvmok{} lv_name{ var } $defaultignore{ } \
                      method{ format } format{ } \
                      use_filesystem{ } filesystem{ ext4 } \
                      mountpoint{ /var } \
              . \

              4000 50000 4100 linux-swap \
                      $lvmok{ } lv_name{ swap_1 } $defaultignore{ } \
                      method{ swap } format{ } \
              .
d-i partman-lvm/confirm_nooverwrite boolean true
d-i partman/confirm_nooverwrite boolean true
d-i partman-lvm/confirm boolean true
d-i partman/confirm_write_new_label boolean true
d-i partman/choose_partition select Finish partitioning and write changes to disk
d-i partman/confirm boolean true