Check redirect rules on CI preview builds

.github/workflows/preview-build.yml

@@ -117,6 +117,10 @@ jobs:
     outputs:
       any_modified: ${{ steps.check-files.outputs.any_modified }}
       all_changed_files: ${{ steps.check-files.outputs.all_changed_files }}
+      added_files: ${{ steps.check-files.outputs.added_files }}
+      modified_files: ${{ steps.check-files.outputs.modified_files }}
+      deleted_files: ${{ steps.check-files.outputs.deleted_files }}
+      renamed_files: ${{ steps.check-files.outputs.renamed_files }}
     steps:
       - name: Checkout
         if: contains(fromJSON('["push", "merge_group", "workflow_dispatch"]'), github.event_name)
@@ -149,6 +153,10 @@ jobs:
     env:
       GITHUB_PR_REF_NAME: ${{ github.event.pull_request.head.ref }}
       MATCH: ${{ needs.match.outputs.content-source-match }}
+      ADDED_FILES: ${{ needs.check.outputs.added_files }}
+      MODIFIED_FILES: ${{ needs.check.outputs.modified_files }}
+      DELETED_FILES: ${{ needs.check.outputs.deleted_files }}
+      RENAMED_FILES: ${{ needs.check.outputs.renamed_files }}
     needs:
       - check
       - match
@@ -234,6 +242,19 @@ jobs:
           && steps.deployment.outputs.result
         uses: elastic/docs-builder/.github/actions/bootstrap@main
 
+      - name: 'Validate redirect rules'
+        if: >
+          env.MATCH == 'true'
+          && (
+            steps.deployment.outputs.result
+            || (
+              needs.check.outputs.any_modified == 'true' 
+              && github.event_name == 'merge_group'
+            )
+          )
+        run: |
+          dotnet run --project src/tooling/docs-builder -- diff validate
+
       # we run our artifact directly, please use the prebuild
       # elastic/docs-builder@main GitHub Action for all other repositories!
       - name: Build documentation

src/tooling/docs-builder/Cli/DiffCommands.cs

@@ -26,6 +26,7 @@ internal sealed class DiffCommands(ILoggerFactory logFactory, ICoreService githu
 	[Command("validate")]
 	public async Task<int> ValidateRedirects([Argument] string? path = null, Cancel ctx = default)
 	{
+		var runningOnCi = !string.IsNullOrEmpty(Environment.GetEnvironmentVariable("GITHUB_ACTIONS"));
 		path ??= "docs";
 
 		await using var collector = new ConsoleDiagnosticsCollector(logFactory, githubActionsService).StartAsync(ctx);
@@ -48,16 +49,21 @@ public async Task<int> ValidateRedirects([Argument] string? path = null, Cancel
 			return collector.Errors;
 		}
 
-		var tracker = new LocalGitRepositoryTracker(collector, root);
-		var changed = tracker.GetChangedFiles(path);
+		IRepositoryTracker tracker = runningOnCi ? new IntegrationGitRepositoryTracker(path) : new LocalGitRepositoryTracker(collector, root, path);
+		var changed = tracker.GetChangedFiles() as GitChange[] ?? [];
+
+		if (changed.Length > 0)
+			collector.EmitHint(string.Empty, $"Found {changed.Length} changes to files related to documentation in the current branch.");
 
 		foreach (var notFound in changed.DistinctBy(c => c.FilePath).Where(c => c.ChangeType is GitChangeType.Deleted or GitChangeType.Renamed
 																	&& !redirects.ContainsKey(c is RenamedGitChange renamed ? renamed.OldFilePath : c.FilePath)))
 		{
 			if (notFound is RenamedGitChange renamed)
 			{
 				collector.EmitError(redirectFileInfo.Name,
-					$"File '{renamed.OldFilePath}' was renamed to '{renamed.NewFilePath}' but it has no redirect configuration set.");
+					runningOnCi
+						? $"A file was renamed to '{renamed.NewFilePath}' but it has no redirect configuration set."
+						: $"File '{renamed.OldFilePath}' was renamed to '{renamed.NewFilePath}' but it has no redirect configuration set.");
 			}
 			else if (notFound.ChangeType is GitChangeType.Deleted)
 			{

src/tooling/docs-builder/Tracking/IRepositoryTracker.cs

@@ -14,7 +14,10 @@ public enum GitChangeType
 	Other
 }
 
+public record GitChange(string FilePath, GitChangeType ChangeType);
+public record RenamedGitChange(string OldFilePath, string NewFilePath, GitChangeType ChangeType) : GitChange(OldFilePath, ChangeType);
+
 public interface IRepositoryTracker
 {
-	IEnumerable<GitChange> GetChangedFiles(string lookupPath);
+	IEnumerable<GitChange> GetChangedFiles();
 }

src/tooling/docs-builder/Tracking/IntegrationGitRepositoryTracker.cs

@@ -0,0 +1,40 @@
+// Licensed to Elasticsearch B.V under one or more agreements.
+// Elasticsearch B.V licenses this file to you under the Apache 2.0 License.
+// See the LICENSE file in the project root for more information
+
+namespace Documentation.Builder.Tracking;
+
+public class IntegrationGitRepositoryTracker(string lookupPath) : IRepositoryTracker
+{
+	private string LookupPath { get; } = $"{lookupPath}/";
+	public IEnumerable<GitChange> GetChangedFiles()
+	{
+		var deletedFiles = Environment.GetEnvironmentVariable("DELETED_FILES") ?? string.Empty;
+		if (!string.IsNullOrEmpty(deletedFiles))
+		{
+			foreach (var file in deletedFiles.Split(' ', StringSplitOptions.RemoveEmptyEntries).Where(f => f.StartsWith(LookupPath)))
+				yield return new GitChange(file, GitChangeType.Deleted);
+		}
+
+		var addedFiles = Environment.GetEnvironmentVariable("ADDED_FILES");
+		if (!string.IsNullOrEmpty(addedFiles))
+		{
+			foreach (var file in addedFiles.Split(' ', StringSplitOptions.RemoveEmptyEntries).Where(f => f.StartsWith(LookupPath)))
+				yield return new GitChange(file, GitChangeType.Added);
+		}
+
+		var modifiedFiles = Environment.GetEnvironmentVariable("MODIFIED_FILES");
+		if (!string.IsNullOrEmpty(modifiedFiles))
+		{
+			foreach (var file in modifiedFiles.Split(' ', StringSplitOptions.RemoveEmptyEntries).Where(f => f.StartsWith(LookupPath)))
+				yield return new GitChange(file, GitChangeType.Modified);
+		}
+
+		var renamedFiles = Environment.GetEnvironmentVariable("RENAMED_FILES");
+		if (!string.IsNullOrEmpty(renamedFiles))
+		{
+			foreach (var file in renamedFiles.Split(' ', StringSplitOptions.RemoveEmptyEntries).Where(f => f.StartsWith(LookupPath)))
+				yield return new RenamedGitChange(string.Empty, file, GitChangeType.Renamed);
+		}
+	}
+}

src/tooling/docs-builder/Tracking/LocalGitRepositoryTracker.cs

@@ -8,17 +8,16 @@
 
 namespace Documentation.Builder.Tracking;
 
-public record GitChange(string FilePath, GitChangeType ChangeType);
-public record RenamedGitChange(string OldFilePath, string NewFilePath, GitChangeType ChangeType) : GitChange(OldFilePath, ChangeType);
-
-public class LocalGitRepositoryTracker(DiagnosticsCollector collector, IDirectoryInfo workingDirectory) : ExternalCommandExecutor(collector, workingDirectory), IRepositoryTracker
+public class LocalGitRepositoryTracker(DiagnosticsCollector collector, IDirectoryInfo workingDirectory, string lookupPath) : ExternalCommandExecutor(collector, workingDirectory), IRepositoryTracker
 {
-	public IEnumerable<GitChange> GetChangedFiles(string lookupPath)
+	private string LookupPath { get; } = lookupPath;
+
+	public IEnumerable<GitChange> GetChangedFiles()
 	{
 		var defaultBranch = GetDefaultBranch();
-		var commitChanges = CaptureMultiple("git", "diff", "--name-status", $"{defaultBranch}...HEAD", "--", $"./{lookupPath}");
+		var commitChanges = CaptureMultiple("git", "diff", "--name-status", $"{defaultBranch}...HEAD", "--", $"./{LookupPath}");
 		var localChanges = CaptureMultiple("git", "status", "--porcelain");
-		ExecInSilent([], "git", "stash", "push", "--", $"./{lookupPath}");
+		ExecInSilent([], "git", "stash", "push", "--", $"./{LookupPath}");
 		var localUnstagedChanges = CaptureMultiple("git", "stash", "show", "--name-status", "-u");
 		ExecInSilent([], "git", "stash", "pop");