debian preseed partman-auto snippet

debian-12-snippet.cfg

### Partitioning
d-i partman-auto/method string lvm
d-i partman-auto-lvm/guided_size string max
d-i partman-auto/expert_recipe string
    boot-lvm-root ::                                        \
        1 1 1 free                                          \
            $iflabel{ gpt }                                 \
            $reusemethod{ }                                 \
            method{ efi }                                   \
            format{ }                                       \
        .                                                   \
        1024 1025 1024 ext2                                 \
            $primary{ } $bootable{ }                        \
            method{ format }                                \
            format{ }                                       \
            use_filesystem{ }                               \
            filesystem{ ext2 }                              \
            mountpoint{ /boot }                             \
        .                                                   \
        1024 1024 200% linux-swap                           \
            $lvmok{ }                                       \
            lv_name{ swap }                                 \
            method{ swap }                                  \
            format{ }                                       \
        .                                                   \
        2048 2048 8192 xfs                                  \
            $lvmok{ }                                       \
            lv_name { var }                                 \
            method{ lvm }                                   \
            format{ }                                       \
            use_filesystem{ }                               \
            filesystem{ xfs }                               \
            mountpoint{ /var }                              \
        .                                                   \
        2048 2048 4096 xfs                                  \
            $lvmok{ }                                       \
            lv_name { tmp }                                 \
            method{ lvm }                                   \
            format{ }                                       \
            use_filesystem{ }                               \
            filesystem{ xfs }                               \
            mountpoint{ /tmp }                              \
        .                                                   \
        4096 8192 -1 xfs                                    \
            $lvmok{ }                                       \
            lv_name{ root }                                 \
            method{ lvm }                                   \
            format{ }                                       \
            use_filesystem{ }                               \
            filesystem{ xfs }                               \
            mountpoint{ / }                                 \
        .                                                   \

d-i partman-lvm/confirm boolean true
d-i partman-lvm/confirm_nooverwrite boolean true

# This makes partman automatically partition without confirmation.
d-i partman-partitioning/confirm_write_new_label boolean true
d-i partman/choose_partition select finish
d-i partman/confirm boolean true
d-i partman/confirm_nooverwrite boolean true

lsblk-output.txt

vagrant@debian:~$ lsblk
NAME                  MAJ:MIN RM  SIZE RO TYPE MOUNTPOINTS
sda                     8:0    0   20G  0 disk
├─sda1                  8:1    0  487M  0 part /boot
├─sda2                  8:2    0    1K  0 part
└─sda5                  8:5    0 19.5G  0 part
  ├─debian--vg-root   254:0    0 18.6G  0 lvm  /
  └─debian--vg-swap_1 254:1    0  980M  0 lvm  [SWAP]
sr0                    11:0    1 1024M  0 rom