update

src/git-directory-helper.ts

@@ -11,13 +11,19 @@ export async function prepareExistingDirectory(
   repositoryPath: string,
   repositoryUrl: string,
   clean: boolean,
-  ref: string
+  ref: string,
+  preserveLocalChanges: boolean = false
 ): Promise<void> {
   assert.ok(repositoryPath, 'Expected repositoryPath to be defined')
   assert.ok(repositoryUrl, 'Expected repositoryUrl to be defined')
 
   // Indicates whether to delete the directory contents
   let remove = false
+  
+  // If preserveLocalChanges is true, log it
+  if (preserveLocalChanges) {
+    core.info(`Preserve local changes is enabled, will attempt to keep local files`)
+  }
 
   // Check whether using git or REST API
   if (!git) {
@@ -114,12 +120,23 @@ export async function prepareExistingDirectory(
     }
   }
 
-  if (remove) {
+  if (remove && !preserveLocalChanges) {
     // Delete the contents of the directory. Don't delete the directory itself
     // since it might be the current working directory.
     core.info(`Deleting the contents of '${repositoryPath}'`)
     for (const file of await fs.promises.readdir(repositoryPath)) {
+      // Skip .git directory as we need it to determine if a file is tracked
+      if (file === '.git') {
+        continue
+      }
       await io.rmRF(path.join(repositoryPath, file))
     }
+  } else if (remove && preserveLocalChanges) {
+    core.info(`Skipping deletion of directory contents due to preserve-local-changes setting`)
+    // We still need to make sure we have a git repository to work with
+    if (!git) {
+      core.info(`Initializing git repository to prepare for checkout with preserved changes`)
+      await fs.promises.mkdir(path.join(repositoryPath, '.git'), { recursive: true })
+    }
   }
 }

src/git-source-provider.ts

@@ -70,7 +70,8 @@ export async function getSource(settings: IGitSourceSettings): Promise<void> {
         settings.repositoryPath,
         repositoryUrl,
         settings.clean,
-        settings.ref
+        settings.ref,
+        settings.preserveLocalChanges
       )
     }