✨ Extract path from Docker Image (#1)

.editorconfig

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+root = true
+
+[*.{json,md,yml,js}]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true

.eslintrc.json

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+{
+    "extends": "airbnb"
+}

.github/workflows/test.yml

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+name: Test Extraction Action
+
+on: [push]
+
+jobs:
+  extract-motd:
+    runs-on: ubuntu-latest
+    name: Extract MOTD From Alpine
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Extract
+        id: extract
+        uses: ./
+        with:
+          image: 'alpine'
+          path: '/etc/motd'
+      - name: Upload Extracted MOTD
+        uses: actions/upload-artifact@v2
+        with:
+          path: ${{ steps.extract.outputs.destination }}/motd
+          name: alpine-motd
+  example:
+    runs-on: ubuntu-latest
+    name: Extract Example From Built Image
+    steps:
+      - uses: actions/checkout@v2
+      - name: Create Example Dockerfile
+        run: |
+          cat <<-DOCKERFILE > Dockerfile
+            FROM alpine
+            RUN mkdir -p /app
+            RUN echo "Hello, World! \$(date)" > /app/example
+          DOCKERFILE
+      - name: Build Docker Image
+        uses: docker/build-push-action@v1
+        with:
+          repository: example
+          tags: ${{ github.sha }}
+          push: false
+      - uses: ./
+        id: extract
+        with:
+          image: example:${{ github.sha }}
+          path: /app
+      - name: Upload Dist
+        uses: actions/upload-artifact@v2
+        with:
+          path: ${{ steps.extract.outputs.destination }}/app
+          name: dist

.gitignore

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+node_modules/

LICENSE

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+MIT License
+
+Copyright (c) 2020 Samuel Ryan <sam@samryan.co.uk>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# Docker Extract
+
+A GitHub Action for extracting files from a Docker Image.
+
+```yaml
+- uses: shrink/actions-docker-extract@v1
+  with:
+    image: 'docker.pkg.github.com/github/semantic/semantic'
+    path: '/etc/motd'
+```
+
+## Inputs
+
+All inputs are required.
+
+| ID  | Description | Example |
+| --- | ----------- | ------- |
+| `image` | Docker Image to extract files from | `alpine` |
+| `path` | Path (from root) to a file or directory within Image | `/etc/motd` |
+
+## Examples
+
+### Build, Extract
+
+Using [docker/build-push-action][build-push-action] to build a Docker
+Image and then extract the contents of the `/app` directory within the newly
+built image to upload as a `dist` artifact.
+
+```yaml
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Build Docker Image
+        uses: docker/build-push-action@v1
+        with:
+          repository: my-example-image
+          tags: latest
+      - uses: shrink/actions-docker-extract@v1
+        with:
+          image: my-example-image
+          path: /app
+      - name: Upload Dist
+        uses: actions/upload-artifact@v2
+        with:
+          path: ${{ steps.extract.outputs.destination }}/app
+          name: dist
+```
+
+### Login, Pull, Extract
+
+Using [docker/login-action][login-action] to authenticate with the GitHub
+Package Registry to extract from a published Docker Image.
+
+```yaml
+jobs:
+  extract:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Login to GitHub Package Registry
+        uses: docker/login-action@v1
+        with:
+          registry: docker.pkg.github.com
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - uses: shrink/actions-docker-extract@v1
+        with:
+          image: ${{ github.repository }}/example-image:latest
+          path: /app
+      - name: Upload Dist
+        uses: actions/upload-artifact@v2
+        with:
+          path: ${{ steps.extract.outputs.destination }}/app
+          name: dist
+```
+
+[build-push-action]: https://github.com/docker/build-push-action
+[login-action]: https://github.com/docker/login-action

action.yml

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+name: 'Docker Extract'
+description: 'Extract file(s) from a Docker Image'
+author: 'Samuel Ryan <sam@samryan.co.uk>'
+inputs:
+  image:
+    description: 'Docker Image to extract files from'
+    required: true
+  path:
+    description: 'Path (from root) to a file or directory within Image'
+    required: true
+outputs:
+  destination:
+    description: 'Destination of extracted file(s)'
+runs:
+  using: 'node12'
+  main: 'dist/index.js'
+branding:
+  icon: 'scissors'
+  color: 'blue'

package.json

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+{
+  "name": "@shrink/actions-docker-extract",
+  "version": "0.1.0",
+  "description": "Extract from a Docker Image",
+  "author": "Samuel Ryan <sam@samryan.co.uk>",
+  "homepage": "https://github.com/shrink/actions-docker-extract#readme",
+  "main": "dist/index.js",
+  "scripts": {
+    "build": "ncc build src/extract.js",
+    "lint": "eslint 'src/**.js' --fix",
+    "commit": "npm run-script lint && npm run-script build"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/shrink/actions-document-sign.git"
+  },
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/shrink/actions-docker-extract/issues"
+  },
+  "dependencies": {
+    "@actions/core": "^1.2.4",
+    "@actions/exec": "^1.0.4"
+  },
+  "devDependencies": {
+    "@zeit/ncc": "^0.22.3",
+    "eslint": "^7.2.0",
+    "eslint-config-airbnb": "^18.2.0",
+    "eslint-plugin-import": "^2.22.0",
+    "eslint-plugin-jsx-a11y": "^6.3.1",
+    "eslint-plugin-react": "^7.20.6",
+    "eslint-plugin-react-hooks": "^4.0.0"
+  }
+}

src/extract.js

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+const core = require('@actions/core');
+const exec = require('@actions/exec');
+
+async function run() {
+  try {
+    const image = core.getInput('image');
+    const path = core.getInput('path');
+    const destination = `.extracted-${Date.now()}`;
+    const create = `docker cp $(docker create ${image}):/${path} ${destination}`;
+
+    await exec.exec(`mkdir -p ${destination}`);
+    await exec.exec(`/bin/bash -c "${create}"`, []);
+
+    core.setOutput('destination', destination);
+  } catch (error) {
+    core.setFailed(error.message);
+  }
+}
+
+run();