Init

.github/workflows/test.yml

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+name: Test
+
+on:
+  pull_request:
+    branches: [ main ]
+  workflow_dispatch:
+
+jobs:
+  test_is_same:
+    strategy:
+      matrix:
+        os: [ ubuntu-20.04, ubuntu-18.04, macos-11, macos-10.15, windows-2016, windows-2019, windows-2022 ]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - run: echo 0 > ~/test
+        shell: bash
+      - uses: smilerobotics/actions-check-command-output-diff@v1
+        id: compare
+        with:
+          command: 'echo 0'
+          command_output: "~/test"
+          cache_key_prefix: "test-is-same-${{ matrix.os }}"
+      - run: test "${{ steps.compare.outputs.is_same }}" == "true"
+        shell: bash
+  test_is_different:
+    strategy:
+      matrix:
+        os: [ ubuntu-20.04, ubuntu-18.04, macos-11, macos-10.15, windows-2016, windows-2019, windows-2022 ]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: smilerobotics/actions-check-command-output-diff@v1
+        id: compare
+        with:
+          command: 'echo $(date)'
+          command_output: "~/test"
+          cache_key_prefix: "test-is-different-${{ matrix.os }}"
+      - run: test "${{ steps.compare.outputs.is_same }}" == "false"
+        shell: bash
+  test_is_different_with_no_file:
+    strategy:
+      matrix:
+        os: [ ubuntu-20.04, ubuntu-18.04, macos-11, macos-10.15, windows-2016, windows-2019, windows-2022 ]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - name: Get Date
+        id: get_date
+        run: |
+          echo "::set-output name=date::$(/bin/date -u "+%Y-%m-%d-%H_%M_%S")"
+        shell: bash
+      - uses: smilerobotics/actions-check-command-output-diff@v1
+        id: compare
+        with:
+          command: 'echo $(date)'
+          command_output: "~/test"
+          cache_key_prefix: "test-is-different-with-no-file-${{ matrix.os }}-${{ steps.get_date.outputs.date }}"
+      - run: test "${{ steps.compare.outputs.is_same }}" == "false"
+        shell: bash

README.md

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+# check-command-output-diff
+
+## Description
+
+An action to run a command and check the difference of the output of the command.
+
+## Required input
+
+1. command: Command to run.
+1. command_output: Path of the command output file.
+1. cache_key_prefix: Key prefix for cache of the command output file.
+
+## Output
+
+1. is_same: If old and new output is same, true.
+
+## Example
+
+```yaml
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    steps:
+      - run: echo 0 > ~/test
+        shell: bash
+      - uses: smilerobotics/actions-check-command-output-diff@v1
+        id: compare
+        with:
+          command: 'echo 0'
+          command_output: "~/test"
+          cache_key_prefix: "test-is-same-${{ matrix.os }}"
+      - run: echo ${{ steps.compare.outputs.is_same }}
+        shell: bash
+```

action.yml

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+name: 'check-command-output-diff'
+description: 'Run command and check diff between old output of the command and new one.'
+inputs:
+  command:
+    description: 'Command to run.'
+    required: true
+  command_output:
+    description: 'Path of the command output file.'
+    required: true
+  cache_key_prefix:
+    description: 'Key prefix for cache of the command output file.'
+    required: true
+outputs:
+  is_same:
+    description: "If old and new output is same, true."
+    value: ${{ steps.compare.outputs.is_same }}
+runs:
+  using: "composite"
+  steps:
+    - name: Get Date
+      id: get_date
+      run: |
+        echo "::set-output name=date::$(/bin/date -u "+%Y-%m-%d-%H_%M_%S")"
+      shell: bash
+    - name: Make temp file
+      id: mktemp
+      run: |
+        echo "::set-output name=tempfile::$(mktemp)"
+      shell: bash
+    - name: Cache
+      uses: actions/cache@v2
+      with:
+        path: ${{ inputs.command_output }}
+        key: ${{ inputs.cache_key_prefix }}-${{ steps.get_date.outputs.date }}
+        restore-keys: ${{ inputs.cache_key_prefix }}-
+    - name: Run command
+      shell: bash
+      run: |
+        ${{ inputs.command }} > ${{ steps.mktemp.outputs.tempfile }}
+    - name: Compare
+      id: compare
+      shell: bash
+      run: |
+        diff ${{ inputs.command_output }} ${{ steps.mktemp.outputs.tempfile }} && echo "::set-output name=is_same::true" || echo "::set-output name=is_same::false"
+        mv ${{ steps.mktemp.outputs.tempfile }} ${{ inputs.command_output }}
+        cat ${{ inputs.command_output }}