Stop failing GitHub Action nightly build if no changes were detected

.github/workflows/nightly.yml

@@ -22,52 +22,63 @@ jobs:
         run: git checkout master
 
       - name: Precondition
+        id: precondition
         if: success()
-        run: .\build\precondition.ps1
+        run: |
+          $result = .\build\precondition.ps1
+          $previousHash = $result.PreviousHash
+          $latestBuildHash = $result.LatestBuildHash
+          $hasChanges = $result.HasChanges
+          echo "Previous hash:     $previousHash"
+          echo "Latest build hash: $latestBuildHash"
+          echo "::set-output name=has_changes::$hasChanges"
         
       - name: Setup MSBuild
+        if: steps.precondition.outputs.has_changes == 'true' && success()
         uses: warrenbuckley/Setup-MSBuild@v1
 
       - name: Setup Nuget
+        if: steps.precondition.outputs.has_changes == 'true' && success()
         uses: warrenbuckley/Setup-Nuget@v1
 
       - name: Setup Git
+        if: steps.precondition.outputs.has_changes == 'true' && success()
         run: |
           git config user.email [email protected]
           git config user.name "GitHub Actions"
       
       - name: Build
-        if: success()
+        if: steps.precondition.outputs.has_changes == 'true' && success()
         run: .\build\build.ps1 nightly Release pack 0
 
       - name: Find NUPKG
-        if: success()
+        if: steps.precondition.outputs.has_changes == 'true' && success()
         run: |
           $filesInPackDir = (Get-ChildItem -Path pack | Sort-Object -Property @{Expression="Name"; Descending=$true})
           $nupkgFile = $filesInPackDir[0].FullName
           echo "::set-env name=NUPKG_FILE::$nupkgFile"
 
       - name: Update nightly.rev
-        if: success()
+        if: steps.precondition.outputs.has_changes == 'true' && success()
         run: .\build\update-nightly-rev.ps1
 
       - name: Increment version
-        if: success()
+        if: steps.precondition.outputs.has_changes == 'true' && success()
         run: .\build\increment-build-version.ps1
 
       - name: Git Commit
-        if: success()
+        if: steps.precondition.outputs.has_changes == 'true' && success()
         run: |
           git add ./build/ExceptionalDevs.Exceptional.nuspec
           git add ./build/nightly.rev
           git commit -m "Nightly Commit" --author="GitHub Actions<[email protected]>"
 
       - name: Git Push
-        if: success()
+        if: steps.precondition.outputs.has_changes == 'true' && success()
         uses: ad-m/github-push-action@master
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Publish
-        if: success()
+        if: steps.precondition.outputs.has_changes == 'true' && success()
         run: nuget push ${{ env.NUPKG_FILE }} ${{ secrets.JETBRAINS_TOKEN }} -source https://plugins.jetbrains.com

build/precondition.ps1

@@ -1,21 +1,13 @@
-$ScriptDir = Split-Path $script:MyInvocation.MyCommand.Path
-$NightlyRevFile = Join-Path -Path $ScriptDir -ChildPath nightly.rev
+$scriptDir = Split-Path $script:MyInvocation.MyCommand.Path
+$nightlyRevFile = Join-Path -Path $scriptDir -ChildPath nightly.rev
 
-$PreviousHash = git rev-parse HEAD~1
-$HashOfLatestBuild = Get-Content -Path $NightlyRevFile -ErrorAction SilentlyContinue
+$previousHash = git rev-parse HEAD~1
+$hashOfLatestBuild = Get-Content -Path $nightlyRevFile -ErrorAction SilentlyContinue
 
-Write-Output "Previous hash:     $PreviousHash"
-Write-Output "Latest Build Hash: $HashOfLatestBuild"
+$hasChanges = -Not ($previousHash -eq $hashOfLatestBuild)
 
-$HasChanges = -Not ($PreviousHash -eq $HashOfLatestBuild)
-
-if ($HasChanges -eq $true)
-{
-    "Some changes detected"
-    exit 0
-}
-else
-{
-    Write-Output "No changes detected"
-    exit 1
+return @{
+    "LatestBuildHash" = $hashOfLatestBuild;
+    "PreviousHash" = $previousHash;
+    "HasChanges" = $hasChanges;
 }