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# Dev Container Features: Self Authoring Template | ||
# Dev Container Features by Fetcharr | ||
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> This repo provides a starting point and example for creating your own custom [dev container Features](https://containers.dev/implementors/features/), hosted for free on GitHub Container Registry. The example in this repository follows the [dev container Feature distribution specification](https://containers.dev/implementors/features-distribution/). | ||
> | ||
> To provide feedback to the specification, please leave a comment [on spec issue #70](https://github.com/devcontainers/spec/issues/70). For more broad feedback regarding dev container Features, please see [spec issue #61](https://github.com/devcontainers/spec/issues/61). | ||
This repository contains a collection of Dev Container Features, used by [Fetcharr](https://github.com/fetcharr). | ||
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## Example Contents | ||
## Contents | ||
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This repository contains a _collection_ of two Features - `hello` and `color`. These Features serve as simple feature implementations. Each sub-section below shows a sample `devcontainer.json` alongside example usage of the Feature. | ||
### [`dotnet-nuke`](src/dotnet-nuke/README.md) | ||
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### `hello` | ||
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Running `hello` inside the built container will print the greeting provided to it via its `greeting` option. | ||
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```jsonc | ||
{ | ||
"image": "mcr.microsoft.com/devcontainers/base:ubuntu", | ||
"features": { | ||
"ghcr.io/devcontainers/feature-starter/hello:1": { | ||
"greeting": "Hello" | ||
} | ||
} | ||
} | ||
``` | ||
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```bash | ||
$ hello | ||
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Hello, user. | ||
``` | ||
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### `color` | ||
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Running `color` inside the built container will print your favorite color to standard out. | ||
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```jsonc | ||
{ | ||
"image": "mcr.microsoft.com/devcontainers/base:ubuntu", | ||
"features": { | ||
"ghcr.io/devcontainers/feature-starter/color:1": { | ||
"favorite": "green" | ||
} | ||
} | ||
} | ||
``` | ||
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```bash | ||
$ color | ||
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my favorite color is green | ||
``` | ||
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## Repo and Feature Structure | ||
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Similar to the [`devcontainers/features`](https://github.com/devcontainers/features) repo, this repository has a `src` folder. Each Feature has its own sub-folder, containing at least a `devcontainer-feature.json` and an entrypoint script `install.sh`. | ||
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``` | ||
├── src | ||
│ ├── hello | ||
│ │ ├── devcontainer-feature.json | ||
│ │ └── install.sh | ||
│ ├── color | ||
│ │ ├── devcontainer-feature.json | ||
│ │ └── install.sh | ||
| ├── ... | ||
│ │ ├── devcontainer-feature.json | ||
│ │ └── install.sh | ||
... | ||
``` | ||
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An [implementing tool](https://containers.dev/supporting#tools) will composite [the documented dev container properties](https://containers.dev/implementors/features/#devcontainer-feature-json-properties) from the feature's `devcontainer-feature.json` file, and execute in the `install.sh` entrypoint script in the container during build time. Implementing tools are also free to process attributes under the `customizations` property as desired. | ||
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### Options | ||
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All available options for a Feature should be declared in the `devcontainer-feature.json`. The syntax for the `options` property can be found in the [devcontainer Feature json properties reference](https://containers.dev/implementors/features/#devcontainer-feature-json-properties). | ||
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For example, the `color` feature provides an enum of three possible options (`red`, `gold`, `green`). If no option is provided in a user's `devcontainer.json`, the value is set to "red". | ||
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```jsonc | ||
{ | ||
// ... | ||
"options": { | ||
"favorite": { | ||
"type": "string", | ||
"enum": [ | ||
"red", | ||
"gold", | ||
"green" | ||
], | ||
"default": "red", | ||
"description": "Choose your favorite color." | ||
} | ||
} | ||
} | ||
``` | ||
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Options are exported as Feature-scoped environment variables. The option name is captialized and sanitized according to [option resolution](https://containers.dev/implementors/features/#option-resolution). | ||
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```bash | ||
#!/bin/bash | ||
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echo "Activating feature 'color'" | ||
echo "The provided favorite color is: ${FAVORITE}" | ||
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... | ||
``` | ||
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## Distributing Features | ||
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### Versioning | ||
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Features are individually versioned by the `version` attribute in a Feature's `devcontainer-feature.json`. Features are versioned according to the semver specification. More details can be found in [the dev container Feature specification](https://containers.dev/implementors/features/#versioning). | ||
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### Publishing | ||
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> NOTE: The Distribution spec can be [found here](https://containers.dev/implementors/features-distribution/). | ||
> | ||
> While any registry [implementing the OCI Distribution spec](https://github.com/opencontainers/distribution-spec) can be used, this template will leverage GHCR (GitHub Container Registry) as the backing registry. | ||
Features are meant to be easily sharable units of dev container configuration and installation code. | ||
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This repo contains a **GitHub Action** [workflow](.github/workflows/release.yaml) that will publish each Feature to GHCR. | ||
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*Allow GitHub Actions to create and approve pull requests* should be enabled in the repository's `Settings > Actions > General > Workflow permissions` for auto generation of `src/<feature>/README.md` per Feature (which merges any existing `src/<feature>/NOTES.md`). | ||
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By default, each Feature will be prefixed with the `<owner/<repo>` namespace. For example, the two Features in this repository can be referenced in a `devcontainer.json` with: | ||
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``` | ||
ghcr.io/devcontainers/feature-starter/color:1 | ||
ghcr.io/devcontainers/feature-starter/hello:1 | ||
``` | ||
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The provided GitHub Action will also publish a third "metadata" package with just the namespace, eg: `ghcr.io/devcontainers/feature-starter`. This contains information useful for tools aiding in Feature discovery. | ||
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'`devcontainers/feature-starter`' is known as the feature collection namespace. | ||
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### Marking Feature Public | ||
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Note that by default, GHCR packages are marked as `private`. To stay within the free tier, Features need to be marked as `public`. | ||
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This can be done by navigating to the Feature's "package settings" page in GHCR, and setting the visibility to 'public`. The URL may look something like: | ||
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``` | ||
https://github.com/users/<owner>/packages/container/<repo>%2F<featureName>/settings | ||
``` | ||
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<img width="669" alt="image" src="https://user-images.githubusercontent.com/23246594/185244705-232cf86a-bd05-43cb-9c25-07b45b3f4b04.png"> | ||
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### Adding Features to the Index | ||
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If you'd like your Features to appear in our [public index](https://containers.dev/features) so that other community members can find them, you can do the following: | ||
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* Go to [github.com/devcontainers/devcontainers.github.io](https://github.com/devcontainers/devcontainers.github.io) | ||
* This is the GitHub repo backing the [containers.dev](https://containers.dev/) spec site | ||
* Open a PR to modify the [collection-index.yml](https://github.com/devcontainers/devcontainers.github.io/blob/gh-pages/_data/collection-index.yml) file | ||
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This index is from where [supporting tools](https://containers.dev/supporting) like [VS Code Dev Containers](https://marketplace.visualstudio.com/items?itemName=ms-vscode-remote.remote-containers) and [GitHub Codespaces](https://github.com/features/codespaces) surface Features for their dev container creation UI. | ||
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#### Using private Features in Codespaces | ||
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For any Features hosted in GHCR that are kept private, the `GITHUB_TOKEN` access token in your environment will need to have `package:read` and `contents:read` for the associated repository. | ||
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Many implementing tools use a broadly scoped access token and will work automatically. GitHub Codespaces uses repo-scoped tokens, and therefore you'll need to add the permissions in `devcontainer.json` | ||
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An example `devcontainer.json` can be found below. | ||
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```jsonc | ||
{ | ||
"image": "mcr.microsoft.com/devcontainers/base:ubuntu", | ||
"features": { | ||
"ghcr.io/my-org/private-features/hello:1": { | ||
"greeting": "Hello" | ||
} | ||
}, | ||
"customizations": { | ||
"codespaces": { | ||
"repositories": { | ||
"my-org/private-features": { | ||
"permissions": { | ||
"packages": "read", | ||
"contents": "read" | ||
} | ||
} | ||
} | ||
} | ||
} | ||
} | ||
``` | ||
Installs NUKE for .NET projects. |
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# NUKE (dotnet-nuke) | ||
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Installs the NUKE for .NET (<https://nuke.build>) | ||
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## Example Usage | ||
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```json | ||
"features": { | ||
"ghcr.io/fetcharr/devcontainer-features/dotnet-nuke:1": {} | ||
} | ||
``` | ||
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## Options | ||
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| Options Id | Description | Type | Default Value | | ||
| ---------- | ----------- | ---- | ------------- | | ||
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## Changelog | ||
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| Version | Notes | | ||
| ------- | --------------- | | ||
| 1.0.0 | Initial Version | |
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{ | ||
"name": "NUKE (.NET)", | ||
"id": "dotnet-nuke", | ||
"version": "1.0.0", | ||
"description": "A feature for installing NUKE (https://nuke.build)", | ||
"options": {}, | ||
"mounts": [], | ||
"dependsOn": { | ||
"ghcr.io/devcontainers/features/dotnet": {} | ||
} | ||
} |
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#!/bin/sh | ||
set -e | ||
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echo "Installing NUKE..." | ||
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dotnet tool install Nuke.GlobalTool --global |
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