Fix automation to update experimental json files in GitHub action

.github/workflows/exp-json.yml

@@ -17,21 +17,29 @@ env:
   POWERSHELL_TELEMETRY_OPTOUT: 1
 
 jobs:
-  create-expjson-windows:
-    name: Update experimental features json
+  create-expjson:
+    strategy:
+      matrix:
+        os: [windows-latest, ubuntu-latest]
     timeout-minutes: 15
-    runs-on: windows-latest
+    runs-on: ${{ matrix.os }}
+    env:
+      OS_TITLE: ${{ matrix.os }}
     if: github.repository == 'PowerShell/PowerShell'
+    name: Update experimental features json
     steps:
       - name: Checkout
         uses: actions/checkout@v2
+        with:
+          fetch-depth: '0'
       - name: Create experimental features file
         run: |
           Import-Module ./build.psm1 -Force
-          Import-Module ./.github/workflows/GHWorkflowHelper -Force
           Start-PSBootstrap
-          Start-PSBuild -Clean -SkipExperimentalFeatureGeneration
-          $pwsh = Get-PSOutput
+          Start-PSBuild -Clean -PSModuleRestore
+          $builtPwsh = Get-PSOutput
+
+          Write-Verbose -Verbose "PWSH path: $builtPwsh"
 
           $getExpFeatureJsonScript = @'
             [System.Collections.ArrayList] $expFeatures = Get-ExperimentalFeature | Where-Object Name -NE PS7DscSupport | ForEach-Object -MemberName Name
@@ -48,35 +56,88 @@ jobs:
             ConvertTo-Json $expFeatures
           '@
 
-          $expFeaturesJson = & pwsh -c $getExpFeatureJsonScript
-          $expFeaturesJson | Out-File ./experimental-feature-windows-new.json -Force
+          $expFeaturesJson = & $builtPwsh -c $getExpFeatureJsonScript
+          $osname = $env:OS_TITLE -like 'windows*' ? 'windows' : 'linux'
+          $fileNamePrefix = "experimental-feature-$osname"
+          $newFileName = "${fileNamePrefix}-new.json"
+
+          Write-Verbose -Verbose 'Experimental features found'
+          $expFeaturesJson | Out-String | Write-Verbose -Verbose
+          $expFeaturesJson | Out-File $newFileName -Force
 
-          if (Test-Path ./experimental-feature-windows.json) {
-            $currentExpFeatures =  Get-Content ./experimental-feature-windows.json -Raw | ConvertFrom-Json
-            $newExpFeatures =  Get-Content ./experimental-feature-windows-new.json -Raw | ConvertFrom-Json
+      - name: Upload experimental features windows
+        uses: actions/upload-artifact@v2
+        with:
+          name: experimentalJson
+          path: experimental-feature-*-new.json
 
-            if (-not (Compare-Object $currentExpFeatures $newExpFeatures)) {
-                Write-Verbose -Verbose "No changes to experimental features json file"
-                Set-GWVariable -Name CREATE_EXP_JSON_PR -Value 'false'
-                exit 0
+  compare-expjson-files:
+    runs-on: ubuntu-latest
+    name: Compare experimental json files and create PR
+    needs: create-expjson
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: '0'
+      - name: Download artifacts
+        uses: actions/download-artifact@v2
+        with:
+          name: experimentalJson
+      - name: Compare json files
+        run: |
+          Import-Module ./.github/workflows/GHWorkflowHelper -Force
+
+          function ShouldCreatePR($currentFile, $newFile) {
+            if (Test-Path $currentFile) {
+              $currentExpFeatures =  Get-Content $currentFile -Raw | ConvertFrom-Json
+              $newExpFeatures =  Get-Content $newFile -Raw | ConvertFrom-Json
+
+              if (-not (Compare-Object $currentExpFeatures $newExpFeatures)) {
+                  Write-Verbose -Verbose "No changes to experimental features json file"
+                  return $false
+              }
             }
+
+            return $true
           }
 
-          Move-Item ./experimental-feature-windows-new.json ./experimental-feature-windows.json -Verbose
-          Set-GWVariable -Name CREATE_EXP_JSON_PR -Value 'true'
+          $currentWinFile = "experimental-feature-windows.json"
+          $currentLinuxFile = "experimental-feature-linux.json"
+          $newWinFile = "experimental-feature-windows-new.json"
+          $newLinuxFile = "experimental-feature-linux-new.json"
 
-      - name: Upload experimental features windows
-        uses: actions/upload-artifact@v2
-        with:
-          name: experimental-feature-windows-new.json
-          path: experimental-feature-windows-new.json
+          $createPrWin = ShouldCreatePR $currentWinFile $newWinFile
+          Write-Verbose -Verbose "Create PR Windows == $createPrWin"
+
+          $createPrLinux = ShouldCreatePR $currentLinuxFile $newLinuxFile
+          Write-Verbose -Verbose "Create PR Windows == $createPrLinux"
+
+          $createPr = $createPrWin -or $createPrLinux
+          Write-Verbose -Verbose "Create PR == $createPr"
+
+          if ($createPrWin) {
+            Move-Item $newWinFile $currentWinFile -Verbose
+          }
+          else {
+            Remove-Item $newWinFile -Verbose
+          }
+
+          if ($createPrLinux) {
+            Move-Item $newLinuxFile $currentLinuxFile -Verbose
+          }
+          else {
+            Remove-Item $newLinuxFile -Verbose
+          }
+
+          Set-GWVariable -Name CREATE_EXP_JSON_PR -Value $createPR
 
       - name: Create Pull Request
         uses: peter-evans/create-pull-request@v3
         id: cpr
         if: env.CREATE_EXP_JSON_PR == 'true'
         with:
           commit-message: "Update experimental-feature-windows.json"
-          title: "Update experimental-feature-windows.json"
+          title: "Update experimental-feature json files"
           base: master
           branch: expjson_update_windows