pisdr-rpi-image/builder/export-noobs/00-release/files/partitions.json

{
    "partitions": [
        {
            "filesystem_type": "FAT",
            "label": "boot",
            "mkfs_options": "-F 32",
            "partition_size_nominal": BOOT_NOM,
            "uncompressed_tarball_size": BOOT_SIZE,
            "want_maximised": false,
            "sha256sum": "BOOT_SHASUM"
        },
        {
            "filesystem_type": "ext4",
            "label": "root",
            "mkfs_options": "-O ^huge_file",
            "partition_size_nominal": ROOT_NOM,
            "uncompressed_tarball_size": ROOT_SIZE,
            "want_maximised": true,
            "sha256sum": "ROOT_SHASUM"
        }
    ]
}