Use common script for git diff changes

eng/common/pipelines/templates/steps/credscan.yml

@@ -8,11 +8,7 @@ steps:
 - pwsh: |
     if ("$(Build.Reason)" -eq 'PullRequest') {
       $targetBranch = "origin/$(System.PullRequest.TargetBranch)" -replace "refs/heads/"
-
-      # Add config to disable the quote and encoding on file name. 
-      # Ref: https://github.com/msysgit/msysgit/wiki/Git-for-Windows-Unicode-Support#disable-quoted-file-names
-      # Ref: https://github.com/msysgit/msysgit/wiki/Git-for-Windows-Unicode-Support#disable-commit-message-transcoding
-      $changedFiles = git -c core.quotepath=off -c i18n.logoutputencoding=utf-8 diff $targetBranch HEAD --name-only --diff-filter=d
+      $changedFiles = & "eng/common/scripts/get-changedfiles.ps1"
       $changedFiles | ForEach-Object { Add-Content -Path "${{ parameters.SourceDirectory }}/credscan.tsv" -Value "${{ parameters.SourceDirectory }}/$_"}
     }
     else {

eng/common/pipelines/templates/steps/eng-common-workflow-enforcer.yml

@@ -1,18 +1,17 @@
 steps:
+  - template: /eng/common/pipelines/templates/steps/set-default-branch.yml
+    parameters:
+      DefaultBranchVariableName: DefaultBranch
   - ${{ if eq(variables['Build.Reason'], 'PullRequest') }}:
     - pwsh: |
         Set-PsDebug -Trace 1
         # Find the default branch of the repo
-        $defaultBranch = (git remote show origin | Out-String) -replace "(?ms).*HEAD branch: (\w+).*", '$1'
+        Write-Host "Default Branch: $(DefaultBranch)"
         $targetBranch = "$(System.PullRequest.TargetBranch)" -replace "refs/heads/"
 
-        Write-Host "Default Branch: ${defaultBranch}"
-
-        if ((!"$(System.PullRequest.SourceBranch)".StartsWith("sync-eng/common")) -and $targetBranch -eq $defaultBranch)
+        if ((!"$(System.PullRequest.SourceBranch)".StartsWith("sync-eng/common")) -and $targetBranch -eq "$(DefaultBranch)")
         {
-
-          $filesInCommonDir = git diff "origin/${targetBranch}" HEAD --name-only -- 'eng/common/*'
-
+          $filesInCommonDir  = & "eng/common/scripts/get-changedfiles.ps1" -TargetCommittish $targetBranch -DiffPath 'eng/common/*'
           if (($LASTEXITCODE -eq 0) -and ($filesInCommonDir.Count -gt 0))
           {
             Write-Host "##vso[task.LogIssue type=error;]Changes to files under 'eng/common' directory should not be made in this Repo`n${filesInCommonDir}"

eng/common/scripts/Detect-Api-Changes.ps1

@@ -16,6 +16,8 @@ Param (
   [string] $TargetBranch = ("origin/${env:SYSTEM_PULLREQUEST_TARGETBRANCH}" -replace "refs/heads/")
 )
 
+. (Join-Path $PSScriptRoot common.ps1)
+
 # Submit API review request and return status whether current revision is approved or pending or failed to create review
 function Submit-Request($filePath, $packageName)
 {
@@ -61,8 +63,7 @@ function Should-Process-Package($pkgPath, $packageName)
     # Get package info from json file created before updating version to daily dev
     $pkgInfo = Get-Content $pkgPropPath | ConvertFrom-Json
     $packagePath = $pkgInfo.DirectoryPath
-    $modifiedFiles = git diff --name-only --relative $TargetBranch HEAD
-    $modifiedFiles = $modifiedFiles.Where({$_.startswith($packagePath)})
+    $modifiedFiles  = Get-ChangedFiles -DiffPath "$packagePath/*" -DiffFilterType ''
     $filteredFileCount = $modifiedFiles.Count
     Write-Host "Number of modified files for package: $filteredFileCount"
     return ($filteredFileCount -gt 0 -and $pkgInfo.IsNewSdk)
@@ -80,7 +81,6 @@ function Log-Input-Params()
     Write-Host "Package Name: $($PackageName)"
 }
 
-. (Join-Path $PSScriptRoot common.ps1)
 Log-Input-Params
 
 if (!($FindArtifactForApiReviewFn -and (Test-Path "Function:$FindArtifactForApiReviewFn")))

eng/common/scripts/Helpers/git-helpers.ps1

@@ -0,0 +1,35 @@
+
+function Get-ChangedFiles {
+  param (
+    [string]$SourceCommittish= "${env:BUILD_SOURCEVERSION}",
+    [string]$TargetCommittish = ("origin/${env:SYSTEM_PULLREQUEST_TARGETBRANCH}" -replace "refs/heads/"),
+    [string]$DiffPath,
+    [string]$DiffFilterType = "d"
+  )
+  # If ${env:SYSTEM_PULLREQUEST_TARGETBRANCH} is empty, then return empty.
+  if ($TargetCommittish -eq "origin/") {
+    Write-Host "There is no target branch passed in. "
+    return ""
+  }
+
+  # Add config to disable the quote and encoding on file name. 
+  # Ref: https://github.com/msysgit/msysgit/wiki/Git-for-Windows-Unicode-Support#disable-quoted-file-names
+  # Ref: https://github.com/msysgit/msysgit/wiki/Git-for-Windows-Unicode-Support#disable-commit-message-transcoding
+  # Git PR diff: https://docs.github.com/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/about-comparing-branches-in-pull-requests#three-dot-and-two-dot-git-diff-comparisons
+  $command = "git -c core.quotepath=off -c i18n.logoutputencoding=utf-8 diff `"$TargetCommittish...$SourceCommittish`" --name-only --diff-filter=$DiffFilterType"
+  if ($DiffPath) {
+  $command = $command + " -- `'$DiffPath`'"
+  }
+  Write-Host $command
+  $changedFiles = Invoke-Expression -Command $command
+  if(!$changedFiles) {
+    Write-Host "No changed files in git diff between $TargetCommittish and $SourceCommittish"
+  }
+  else {
+  Write-Host "Here are the diff files:"
+  foreach ($file in $changedFiles) {
+      Write-Host "    $file"
+  }
+  }
+  return $changedFiles
+}

eng/common/scripts/check-spelling-in-changed-files.ps1

@@ -286,13 +286,7 @@ if (!(Test-Path $CspellConfigPath)) {
 # Lists names of files that were in some way changed between the
 # current $SourceBranch and $TargetBranch. Excludes files that were deleted to
 # prevent errors in Resolve-Path
-Write-Host "git diff --diff-filter=d --name-only --relative $TargetBranch $SourceBranch"
-$changedFilesList = git diff `
-  --diff-filter=d `
-  --name-only `
-  --relative `
-  $TargetBranch `
-  $SourceBranch
+$changedFilesList = Get-ChangedFiles
 
 $changedFiles = @()
 foreach ($file in $changedFilesList) {

eng/common/scripts/common.ps1

@@ -12,6 +12,7 @@ $EngScriptsDir = Join-Path $EngDir "scripts"
 . (Join-Path $EngCommonScriptsDir Invoke-GitHubAPI.ps1)
 . (Join-Path $EngCommonScriptsDir Invoke-DevOpsAPI.ps1)
 . (Join-Path $EngCommonScriptsDir artifact-metadata-parsing.ps1)
+. (Join-Path $EngCommonScriptsDir "Helpers" git-helpers.ps1)
 
 # Setting expected from common languages settings
 $Language = "Unknown"

eng/common/scripts/get-changedfiles.ps1

@@ -0,0 +1,33 @@
+
+<#
+  .SYNOPSIS
+  Returns git diff changes in pull request.
+  .DESCRIPTION
+  The script is to return diff changes in pull request.
+  .PARAMETER SourceCommittish
+  The branch committish PR merges from.
+  Definition of committish: https://git-scm.com/docs/gitglossary#Documentation/gitglossary.txt-aiddefcommit-ishacommit-ishalsocommittish
+  .PARAMETER TargetCommittish
+  The branch committish PR targets to merge into.
+  .PARAMETER DiffPath
+  The files which git diff to scan against. Support regex match. E.g. "eng/common/*", "*.md"
+  .PARAMETER DiffFilterType
+  The filter type A(a)dd, D(d)elete, R(r)ename, U(u)pate. 
+  E.g. 'ad' means filter out the newly added file and deleted file 
+  E.g. '' means no filter on file mode.
+#>
+[CmdletBinding()]
+param (
+  [string] $SourceCommittish = "${env:BUILD_SOURCEVERSION}",
+  [string] $TargetCommittish = ("origin/${env:SYSTEM_PULLREQUEST_TARGETBRANCH}" -replace "refs/heads/"),
+  [string] $DiffPath = "",
+  [string] $DiffFilterType = 'd'
+)
+
+Set-StrictMode -Version 3
+. (Join-Path $PSScriptRoot common.ps1)
+
+return Get-ChangedFiles -SourceCommittish $SourceCommittish `
+-TargetCommittish $TargetCommittish `
+-DiffPath $DiffPath `
+-DiffFilterType $DiffFilterType

eng/common/scripts/get-diff-changes-from-PR.ps1

@@ -0,0 +1,32 @@
+
+function Get-PullRequest-Diff-Changes {
+  param (
+    [string]$SourceCommittish= "${env:BUILD_SOURCEVERSION}",
+    [string]$TargetCommittish = ("origin/${env:SYSTEM_PULLREQUEST_TARGETBRANCH}" -replace "refs/heads/"),
+    [string]$DiffPath,
+    [string]$DiffFilterType = "d"
+  )
+  # If ${env:SYSTEM_PULLREQUEST_TARGETBRANCH} is empty, then return empty.
+  if ($TargetCommittish -eq "origin/") {
+    Write-Host "There is no target branch passed in. "
+    return ""
+  }
+
+  # Git PR diff: https://docs.github.com/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/about-comparing-branches-in-pull-requests#three-dot-and-two-dot-git-diff-comparisons
+  $command = "git -c core.quotepath=off -c i18n.logoutputencoding=utf-8 diff `"$TargetCommittish...$SourceCommittish`" --name-only --diff-filter=$DiffFilterType"
+  if ($DiffPath) {
+    $command = $command + " -- `'$DiffPath`'"
+  }
+  Write-Host $command
+  $changedFiles = Invoke-Expression -Command $command
+  if(!$changedFiles) {
+    Write-Host "No changed files in git diff between $TargetCommittish and $SourceCommittish"
+  }
+  else {
+    Write-Host "Here are the diff files:"
+    foreach ($file in $changedFiles) {
+      Write-Host "    $file"
+    }
+  }
+  return $changedFiles
+}

eng/common/scripts/get-markdown-files-from-changed-files.ps1

@@ -4,46 +4,7 @@ param (
   # The target branch to compare with.
   [string] $targetBranch = ("origin/${env:SYSTEM_PULLREQUEST_TARGETBRANCH}" -replace "/refs/heads/")
 )
-$deletedFiles = (git diff $targetBranch HEAD --name-only --diff-filter=D)
-$renamedFiles = (git diff $targetBranch HEAD --diff-filter=R)
-$changedMarkdowns = (git diff $targetBranch HEAD --name-only -- '*.md')
 
-$beforeRenameFiles = @()
-# Retrieve the 'renamed from' files. Git command only returns back the files after rename. 
-# In order to have the files path before rename, it has to do some regex checking. 
-# It is better to be replaced by more reliable commands if any.
-foreach ($file in $renamedFiles) {
-  if ($file -match "^rename from (.*)$") {
-    $beforeRenameFiles += $file -replace "^rename from (.*)$", '$1'
-  }
-}
-# A combined list of deleted and renamed files.
-$relativePathLinks = ($deletedFiles + $beforeRenameFiles)
-# Removed the deleted markdowns. 
-$changedMarkdowns = $changedMarkdowns | Where-Object { $deletedFiles -notcontains $_ }
-# Scan all markdowns and find if it contains the deleted or renamed files.
-$markdownContainLinks = @()
-$allMarkdownFiles = Get-ChildItem -Path $RootRepo -Recurse -Include *.md
-foreach ($f in $allMarkdownFiles) {
-  $filePath = $f.FullName
-  $content = Get-Content -Path $filePath -Raw
-  foreach ($l in $relativePathLinks) {
-    if ($content -match $l) {
-      $markdownContainLinks += $filePath
-      break
-    }
-  }
-}
+. (Join-Path $PSScriptRoot common.ps1)
 
-# Convert markdowns path of the PR to absolute path.
-$adjustedReadmes = $changedMarkdowns | Foreach-Object { Resolve-Path $_ }
-$markdownContainLinks += $adjustedReadmes
-
-# Get rid of any duplicated ones.
-$allMarkdowns = [string[]]($markdownContainLinks | Sort-Object | Get-Unique)
-
-Write-Host "Here are all markdown files we need to check based on the changed files:"
-foreach ($file in $allMarkdowns) {
-  Write-Host "    $file"
-}
-return $allMarkdowns
+return Get-ChangedFiles -TargetCommittish $targetBranch -DiffPath '*.md'