[ci] Don't emit warnings for absence of failure logs (#20316)

* No warning for absence of failure logs

* Update condition for osx and linux

Co-authored-by: Billy Robert O'Neal III <bion@microsoft.com>

scripts/azure-pipelines/linux/azure-pipelines.yml

@@ -56,7 +56,7 @@ jobs:
     inputs:
       PathtoPublish: '$(Build.ArtifactStagingDirectory)/failure-logs'
       ArtifactName: 'failure logs for x64-linux'
-    condition: always()
+    condition: ne(variables['FAILURE_LOGS_EMPTY'], 'True')
   - bash: |
       python3 scripts/file_script.py /mnt/vcpkg-ci/installed/vcpkg/info/
     displayName: 'Build a file list for all packages'

scripts/azure-pipelines/osx/azure-pipelines.yml

@@ -50,7 +50,7 @@ jobs:
     inputs:
       PathtoPublish: '$(Build.ArtifactStagingDirectory)/failure-logs'
       ArtifactName: 'failure logs for x64-osx'
-    condition: always()
+    condition: ne(variables['FAILURE_LOGS_EMPTY'], 'True')
   - bash: |
       python3 scripts/file_script.py /Users/vagrant/Data/installed/vcpkg/info/
     displayName: 'Build a file list for all packages'

scripts/azure-pipelines/test-modified-ports.ps1

@@ -137,6 +137,9 @@ else
     & "./vcpkg$executableExtension" ci $Triplet --x-xunit=$xmlFile --exclude=$skipList --failure-logs=$failureLogs @commonArgs
 }
 
+$failureLogsEmpty = ((Test-Path $failureLogs) -and (Get-ChildItem $failureLogs).count -eq 0)
+Write-Host "##vso[task.setvariable variable=FAILURE_LOGS_EMPTY]$failureLogsEmpty"
+
 if ($LASTEXITCODE -ne 0)
 {
     throw "vcpkg ci failed"

scripts/azure-pipelines/windows/azure-pipelines.yml

@@ -115,7 +115,7 @@ jobs:
     inputs:
       PathtoPublish: '$(Build.ArtifactStagingDirectory)\failure-logs'
       ArtifactName: 'failure logs for ${{ parameters.triplet }}'
-    condition: always()
+    condition: ne(variables['FAILURE_LOGS_EMPTY'], 'True')
   - task: PowerShell@2
     displayName: 'Build a file list for all packages'
     condition: always()