diskimage-builder 构建中自定义分区

### 官方参考文档

> diskimage-builder code
https://opendev.org/openstack/diskimage-builder

>官方分区设置 
> 
> https://docs.openstack.org/diskimage-builder/latest/user_guide/building_an_image.html
> 
> If you wish to customise the top-level block-device-default.yaml file
> from one of the block-device-* elements, set the environment variable
> DIB_BLOCK_DEVICE_CONFIG. This variable must hold YAML structured
> configuration data or be a file:// URL reference to a on-disk
> configuration file.

</br>
在自己自定义的element 的根目录下，创建一个文件block-device-default.yaml，将分区方案按yaml 文件格式配置其中，如果element 下方有一个block-device-default.yaml，则会优先使用用户定义的分区配置，如果用户无定制，则使用默认配置：
https://opendev.org/openstack/diskimage-builder/src/branch/master/diskimage_builder/elements/block-device-mbr/block-device-default.yaml

或使用变量DIB_BLOCK_DEVICE_CONFIG定义分区配置，将block-device-default.yaml的文本赋值给DIB_BLOCK_DEVICE_CONFIG
</br>

https://github.com/GuaKing/qcow2build.git

### 官方的一个默认配置：
磁盘全部容量分配root分区，/etc/fstab 中的内容和选项可在mkfs 中定义
```

- local_loop:
    name: image0

- partitioning:
    base: image0
    label: mbr
    partitions:
      - name: root
        flags: [ boot, primary ]
        size: 100%
        mkfs:
          mount:
            mount_point: /
            fstab:
              options: "defaults"
              fsck-passno: 1
```

</br>
### 多个分区的配置：
```
- local_loop:
    name: image0
- partitioning:
    base: image0
    label: mbr
    partitions:
      - name: root
        flags: [ boot, primary ]
        size: 30G
        mkfs:
          mount:
            mount_point: /
            fstab:
              options: "defaults"
              fsck-passno: 1
      - name: log
        size: 10G
        mkfs:
          type: ext4
          mount:
            mount_point: /var/log
            fstab:
              options: "defaults"
              fsck-passno: 2
      - name: crash
        size: 10G
        mkfs:
          type: ext4
          mount:
            mount_point: /var/crash
            fstab:
              options: "defaults"
              fsck-passno: 2   
```

</br>
### LVM ：多个逻辑卷的配置
```
- local_loop:
    name: image0

- partitioning:
    base: image0
    label: mbr
    partitions:
      - name: root
        flags: [ boot,primary ]
        size: 100%

- lvm:
    name: lvm
    pvs:
      - name: pv
        options: ["--force"]
        base: root

vgs:
      - name: gua_vg
        base: ["pv"]
        options: ["--force"]

lvs:
      - name: lv_log
        base: gua_vg
        size: 10G

- name: lv_crash
        base: gua_vg
        size: 10G

- name: lv_root
        base: gua_vg
        extents: 100%Free

- mkfs:
    name: fs_log
    base: lv_log
    label: "cloudimage-log"
    type: "ext4"
    mount:
      mount_point: /var/log
      fstab:
          options: "defaults"
          fsck-passno: 2

- mkfs:
    name: fs_crash
    base: lv_crash
    label: "cloudimage-crash"
    type: "ext4"
    mount:
      mount_point: /var/crash
      fstab:
          options: "defaults"
          fsck-passno: 2

- mkfs:
    name: fs_root
    base: lv_root
    label: "cloudimage-root"
    type: "ext4"
    mount:
      mount_point: /
      fstab:
          options: "defaults"
          fsck-passno: 1

```

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