Brillo's partitioning scheme

Question

I've just recently stumbled over Brillo on Google's source code website. On it, I've found several files with the extension bpt. These are JSON files that appear to describe partitions on devices. Here are the contents of the base file:

{
    "settings": {
        "disk_size": "4 GiB"
    },
    "partitions": [
        {
            "ab": true,
            "label": "boot",
            "size": "32 MiB",
            "guid": "auto",
            "type_guid": "brillo_boot"
        },
        {
            "ab": true,
            "label": "system",
            "size": "512 MiB",
            "guid": "auto",
            "type_guid": "brillo_system"
        },
        {
            "ab": true,
            "label": "odm",
            "size": "512 MiB",
            "guid": "auto",
            "type_guid": "brillo_odm"
        },
        {
            "label": "misc",
            "size": "1 MiB",
            "type_guid": "brillo_misc"
        },
        {
            "label": "userdata",
            "grow": true,
            "guid": "auto",
            "type_guid": "brillo_userdata"
        }
    ]
}

I can't find any documentation on this. Is it a new partition scheme (e.g., MBR, GPT, APM, Tegra PT, MTD's command line partition table parsing, etc.)?

score 0 · Answer 1 · answered Jul 25 '16 at 03:09

JSON files with .bpt extensions are consumed by bpttool - A tool for partitioning disk images for Brillo and Android.

This is open sourced and is hosted at https://android.googlesource.com/platform/system/tools/bpt/+/master/

Partitioning directives are expressed in the .bpt JSON file.

Looking at the history of the repository (relatively new, only 4 months old). This was first introduced for Brillo and will probably end up in Android versions soon (In Nougat perhaps?). This may be a replacement for the GPT partitioning scheme or a derivative of it.

Brillo's partitioning scheme

1 Answers1