Avoid republishing coverage artifacts on CI retries

.vsts-dotnet-ci.yml

@@ -371,7 +371,7 @@ jobs:
     condition: eq(variables.onlyDocChanged, 0)
     inputs:
       targetPath: '$(Build.SourcesDirectory)/artifacts/CoverageResults/merged.coverage'
-      artifact: 'LinuxCoreCoverage'
+      artifact: 'LinuxCoreCoverage_Attempt$(System.JobAttempt)'
       publishLocation: 'pipeline'
   - task: PublishTestResults@2
     displayName: Publish .NET Test Results
@@ -460,7 +460,7 @@ jobs:
     condition: eq(variables.onlyDocChanged, 0)
     inputs:
       targetPath: '$(Build.SourcesDirectory)/artifacts/CoverageResults/merged.coverage'
-      artifact: 'MacCoreCoverage'
+      artifact: 'MacCoreCoverage_Attempt$(System.JobAttempt)'
       publishLocation: 'pipeline'
   - task: PublishTestResults@2
     displayName: Publish .NET Test Results
@@ -551,16 +551,50 @@ jobs:
 #       buildType: 'current'
 #       artifactName: 'WindowsFullReleaseCoverage'
 #       targetPath: '$(Build.SourcesDirectory)/artifacts/TestResults/CoverageResults/WindowsFullRelease'
+  - task: PowerShell@2
+    displayName: Select latest coverage artifacts
+    inputs:
+      targetType: inline
+      pwsh: true
+      script: |
+        $headers = @{ Authorization = "Bearer $env:SYSTEM_ACCESSTOKEN" }
+        $uri = "$(System.CollectionUri)$(System.TeamProjectId)/_apis/build/builds/$(Build.BuildId)/artifacts?api-version=7.1"
+        $artifacts = (Invoke-RestMethod -Uri $uri -Headers $headers).value
+
+        foreach ($coverage in @(
+          @{ Prefix = 'LinuxCoreCoverage'; Variable = 'LinuxCoreCoverageArtifact' },
+          @{ Prefix = 'MacCoreCoverage'; Variable = 'MacCoreCoverageArtifact' }
+        )) {
+          $pattern = "^$([regex]::Escape($coverage.Prefix))_Attempt(?<attempt>\d+)$"
+          $artifact = $artifacts |
+            ForEach-Object {
+              if ($_.name -match $pattern) {
+                [pscustomobject]@{ Name = $_.name; Attempt = [int]$Matches.attempt }
+              }
+            } |
+            Sort-Object Attempt -Descending |
+            Select-Object -First 1
+
+          if ($null -eq $artifact) {
+            throw "No $($coverage.Prefix) artifact found for build $(Build.BuildId)."
+          }
+
+          Write-Host "Using $($artifact.Name)."
+          Write-Host "##vso[task.setvariable variable=$($coverage.Variable)]$($artifact.Name)"
+        }
+    env:
+      SYSTEM_ACCESSTOKEN: $(System.AccessToken)
+    condition: eq(variables.onlyDocChanged, 0)
   - task: DownloadPipelineArtifact@2
     inputs:
       buildType: 'current'
-      artifactName: 'LinuxCoreCoverage'
+      artifactName: '$(LinuxCoreCoverageArtifact)'
       targetPath: '$(Build.SourcesDirectory)/artifacts/TestResults/CoverageResults/LinuxCore'
     condition: eq(variables.onlyDocChanged, 0)
   - task: DownloadPipelineArtifact@2
     inputs:
       buildType: 'current'
-      artifactName: 'MacCoreCoverage'
+      artifactName: '$(MacCoreCoverageArtifact)'
       targetPath: '$(Build.SourcesDirectory)/artifacts/TestResults/CoverageResults/MacCore'
     condition: eq(variables.onlyDocChanged, 0)