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Package Definitions

A package is one building block of a container - typically composed of a Dockerfile and optional configuration scripts.

You might notice that the Dockerfiles in this repo have special package metadata encoded in their header comments:

#---
# name: pytorch
# alias: torch
# group: ml
# config: config.py
# depends: [python, numpy, onnx]
# test: test.py
#---
ARG BASE_IMAGE
FROM ${BASE_IMAGE}

...

The text between #--- is YAML and is extracted by the build system. Each package dict has the following keys:

Key Type Description
name str the name of the package
alias str or list[str] alternate names the package can be referred to by
build_args dict ARG:VALUE pairs that are --build-args to docker build
build_flags str additional options that get added to the docker build command
config str or list[str] one or more config files to load (.py, .json, .yml, .yaml)
depends str or list[str] list of packages that this package depends on, and will be built
disabled bool set to true for the package to be disabled
dockerfile str filename of the Dockerfile (optional)
docs str text or markdown that is added to a package's auto-generated readme
group str optional group the package belongs to (e.g. ml, llm, cuda)
notes str brief one-line docs that are added to a package's readme table
path str path to the package's directory (automatically populated)
prefix str text prepended to the container tag. not part of the package's name for referencing.
postfix str text appended to the container tag (default is r$L4T_VERSION)
requires str the version(s) of L4T the package is compatible with (e.g. >=35.2.1 for JetPack 5.1+)
test str or list[str] one or more test commands/scripts to run (.py, .sh, or a shell command)
  • these keys can all be accessed by any of the configuration methods below
  • any filenames or paths should be relative to the package's path
  • see the Version Specifiers Specification for valid syntax around requires

Packages can also include nested sub-packages (for example, all the ROS variants), which are typically generated in a config file.

YAML

In lieu of having the package metadata right there in the Dockerfile header, packages can provide a separate YAML file (normally called config.yaml or config.yml) with the same information:

name: pytorch
alias: torch
group: ml
config: config.py
depends: [python, numpy, onnx]
dockerfile: Dockerfile
test: test.py

This would be equivalent to having it encoded into the Dockerfile like above.

JSON

Config files can also be provided in JSON format (normally called config.json). The JSON and YAML configs typically get used when defining meta-containers that may not even have their own Dockerfiles, but exist solely as combinations of other packages - like l4t-pytorch does:

{
    "l4t-pytorch": {
        "group": "ml",
        "depends": ["pytorch", "torchvision", "torchaudio", "torch2trt", "opencv", "pycuda"]
    }
}

You can define multiple packages/containers per config file, like how l4t-tensorflow has versions for both TF1/TF2:

{
    "l4t-tensorflow:tf1": {
        "group": "ml",
        "depends": ["tensorflow", "opencv", "pycuda"]
    },
    
    "l4t-tensorflow:tf2": {
        "group": "ml",
        "depends": ["tensorflow2", "opencv", "pycuda"]
    }
}

Python

Python configuration scripts (normally called config.py) are the most expressive and get executed at the start of a build, and can dynamically set build parameters based on your environment and version of JetPack/L4T. They have a global package dict added to their scope by the build system, which is used to configure the package:

from jetson_containers import L4T_VERSION, CUDA_ARCHITECTURES

if L4T_VERSION.major >= 34:  
    MY_PACKAGE_VERSION = 'v5.0'  # on JetPack 5
else:                        
    MY_PACKAGE_VERSION = 'v4.0'  # on JetPack 4

package['build_args'] = {
    'MY_PACKAGE_VERSION': MY_PACKAGE_VERSION,
    'CUDA_ARCHITECTURES': ';'.join(CUDA_ARCHITECTURES),
}

This example sets build args in a Dockerfile, based on the version of JetPack/L4T that's running and the GPU architectures to compile for. Typically the package's static settings remain in the Dockerfile header for the best visibility, while config.py sets the dynamic ones.

The jetson_containers module exposes these system variables that you can import and parameterize Dockerfiles off of:

Name Type Description
L4T_VERSION packaging.version.Version version of L4T from /etc/nv_tegra_release
JETPACK_VERSION packaging.version.Version version of JetPack corresponding to L4T version
PYTHON_VERSION packaging.version.Version version of Python (3.6 or 3.8)
CUDA_VERSION packaging.version.Version version of CUDA (under /usr/local/cuda)
CUDA_ARCHITECTURES list[int] NVCC GPU architectures for codegen (e.g. [72,87])
SYSTEM_ARCH str aarch64 or x86_64
LSB_RELEASE str 18.04 or 20.04
LSB_CODENAME str bionic or focal

Of course, it being Python, you can perform basically any other system queries/configuration you want using Python's built-in libraries, including manipulating files used by the build context, ect.