Update GitHub Action for Modern Syntax

.github/workflows/test-action.yaml

@@ -0,0 +1,24 @@
+name: Test container-diff Action
+
+on: 
+  pull_request: []
+
+jobs:
+  test-container-diff:
+    name: Test container-diff
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        # Add more test cases here as necessary
+        args:
+          - vanessa/salad --type=file --output=./data.json --json
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Run container-diff
+        uses: ./actions
+        with:
+          args: ${{ matrix.args }}
+      - name: View output
+        run: cat ./data.json

actions/Dockerfile

@@ -1,25 +1,7 @@
-FROM golang:1.11.3-stretch
+FROM debian:bookworm
 
 # docker build -f actions/Dockerfile -t googlecontainertools/container-diff .
 
-RUN apt-get update && \
-    apt-get install -y automake \
-                       libffi-dev \ 
-                       libxml2 \
-                       libxml2-dev \
-                       libxslt-dev \
-                       libxslt1-dev \
-                       git \
-                       gcc g++ \
-                       wget \
-                       locales
-
-RUN sed -i -e 's/# en_US.UTF-8 UTF-8/en_US.UTF-8 UTF-8/' /etc/locale.gen && \
-    locale-gen
-ENV LANG en_US.UTF-8  
-ENV LANGUAGE en_US:en  
-ENV LC_ALL en_US.UTF-8
-
 LABEL "com.github.actions.name"="container-diff GitHub Action"
 LABEL "com.github.actions.description"="use Container-Diff in Github Actions Workflows"
 LABEL "com.github.actions.icon"="cloud"
@@ -29,14 +11,10 @@ LABEL "repository"="https://www.github.com/GoogleContainerTools/container-diff"
 LABEL "homepage"="https://www.github.com/GoogleContainerTools/container-diff"
 LABEL "maintainer"="Google Inc."
 
-# Install container-diff from master
-RUN go get github.com/GoogleContainerTools/container-diff && \
-    cd ${GOPATH}/src/github.com/GoogleContainerTools/container-diff && \
-    go get && \
-    make && \
-    go install && \
-    mkdir -p /code && \
-    apt-get autoremove
+# Install container-diff latest release
+RUN apt-get update && apt-get install -y curl && \
+    curl -LO https://storage.googleapis.com/container-diff/latest/container-diff-linux-amd64 && \
+    install container-diff-linux-amd64 /usr/local/bin/container-diff
 
 ADD entrypoint.sh /entrypoint.sh
 

actions/README.md

@@ -4,78 +4,49 @@ This is a Github Action to allow you to run Container Diff in a
 [Github Actions](https://help.github.com/articles/about-github-actions/#about-github-actions)
 workflow. The intended use case is to build a Docker container from the repository,
 push it to Docker Hub, and then use container-diff to extract metadata for it that
-you can use in other workflows (such as deploying to Github pages). In
-the example below, we will show you how to build a container, push
-to Docker Hub, and then container diff.  Here is the entire workflow:
+you can use in other workflows (such as deploying to Github pages). You can also run
+container diff to extract metadata for a container you've just built locally in the action.
 
-## Example 1: Run Container Diff
+## 1. Action Parameters
 
-Given an existing container on Docker Hub, we can run container diff
-without doing any kind of build.
+The action accepts the following parameters:
 
-```
-workflow "Run container-diff isolated" {
-  on = "push"
-  resolves = ["list"]
-}
+| Name | Description | Type| Default | Required |
+|------|-------------|-----|---------|----------|
+| command | main command for container-diff | string | analyze | false |
+| args  | The full list of arguments to follow container-diff (see example below) | string | help | true |
 
-action "Run container-diff" {
-  uses = "GoogleContainerTools/container-diff/actions@master"
-  args = ["analyze vanessa/salad --type=file --output=/github/workspace/data.json --json"]
-}
+See below for a simple example. Another interesting use case would be to generate metadata and upload
+to an OCI registry using [OCI Registry As Storage](https://oras.land/).
 
-action "list" {
-  needs = ["Run container-diff"]
-  uses = "actions/bin/sh@master"
-  runs = "ls"
-  args = ["/github/workspace"]
-}
+## 2. Run Container Diff
+
+Given an existing container on Docker Hub, we can run container diff
+without doing any kind of build.
+
+```yaml
+name: Run container-diff
+
+on: 
+  pull_request: []
+
+jobs:
+  container-diff:
+    name: Run container-diff
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Run container-diff
+        uses: GoogleContainerTools/container-diff/actions@master
+        with:
+          # Note this command is the default and does not need to be included
+          command: analyze          
+          args: vanessa/salad --type=file --output=./data.json --json
+      - name: View output
+        run: cat ./data.json
 ```
 
 In the above, we run container-diff to output apt and pip packages, history,
 and the filesystem for the container "vanessa/salad" that already exists on
 Docker Hub. We save the result to a data.json output file. The final step in 
 the workflow (list) is a courtesy to show that the data.json file is generated.
-
-## Example 2: Build, Deploy, Run Container Diff
-
-This next example is slightly more complicated in that it will run container-diff
-after a container is built and deployed from a Dockerfile present in the repository.
-
-```
-workflow "Run container-diff after deploy" {
-  on = "push"
-  resolves = ["Run container-diff"]
-}
-
-action "build" {
-  uses = "actions/docker/cli@master"
-  args = "build -t vanessa/salad ."
-}
-
-action "login" {
-  uses = "actions/docker/login@master"
-  secrets = ["DOCKER_USERNAME", "DOCKER_PASSWORD"]
-}
-
-action "push" {
-  uses = "actions/docker/cli@master"
-  args = "push vanessa/salad"
-}
-
-action "Run container-diff" {
-  needs = ["build", "login", "push"]
-  uses = "GoogleContainerTools/container-diff/actions@master"
-  args = ["analyze vanessa/salad --type=file --output=/github/workspace/data.json --json"]
-}
-
-action "list" {
-  needs = ["Run container-diff"]
-  uses = "actions/bin/sh@master"
-  runs = "ls"
-  args = ["/github/workspace"]
-}
-```
-
-The intended use case of the above would be to, whenever you update your
-container, deploy its metadata to Github pages (or elsewhere).

actions/action.yaml

@@ -0,0 +1,14 @@
+name: container-diff
+
+inputs:
+  command:
+    required: true
+    description: "Container diff command to use (defaults to analyze)"
+    default: analyze
+  args:
+    description: "String of arguments to pass to the container-diff command"
+    default: help
+
+runs:
+  using: 'docker'
+  image: 'Dockerfile'

actions/entrypoint.sh

@@ -1,4 +1,5 @@
 #!/bin/bash
 
-echo "$@"
-/go/bin/container-diff ${@}
+command="${INPUT_COMMAND} ${INPUT_ARGS}"
+echo "container-diff ${command}"
+/usr/local/bin/container-diff ${command}