rouge: create partition from specific rootfs folder

[al1img]

We need the functionality which yocto wic plugin does: it can pack the specific folder into a separate partition. It is required in the following use cases: RO rootfs + RW /var or/and RW /home. We should have a possibility to add /var /home files into separate partition.

[rshym]

The solution is on review #60

[rshym]

Required functionality was merged as #60.
You need to use items instead of files.
Using items you may specify folders to be used as content for partition. Symlinks are preserved inside directories for ext4 partitions.

[rshym]

Please see example of yaml:

images:
  test:
    type: gpt
    desc: "test image"
    partitions:
      test:
        gpt_type: 21686148-6449-6E6F-744E-656564454649 # BIOS boot partition (kinda...)
        type: ext4
        items:
          "file1": "./file_1"
          "folderA/fileA": "dirA/file_A"
          "folderB": "dirA"
          "/": "dirA/"
          "/folderC/subA": "dirA/"

[lorc]

@al1img are you satisfied with the solution? Can we close the issue?

[al1img]

Not fully. I can't set file permissions. I would like to control root_owner and -d root-directory options of mkfs command.

[lorc]

I see... Do you have an idea how this can be describe at YAML level? E.g. what format should work for you? In the most generic case it should be something like this:

items_ext:
  - source: "/local/path"
    destination: "/path/on/image"
    permissions: "rwxrw-r--" (or maybe just 0642?)
    owner: "root"
    group: "root"
  - source: "/other/local/path"
    destination: "/oher/path/on/image"
    permissions: "rw------"
    owner: "root"
    group: "root"

Problem is that it is quite mouthful. And can grow very fast. And mkfs.ext4 command does not support such features, so we need to find another solution.