Feature: Git sync, set-tracking, and push divergence handling (#796)

apps/server/src/routes/worktree/index.ts

@@ -67,6 +67,8 @@ import { createAbortOperationHandler } from './routes/abort-operation.js';
 import { createContinueOperationHandler } from './routes/continue-operation.js';
 import { createStageFilesHandler } from './routes/stage-files.js';
 import { createCheckChangesHandler } from './routes/check-changes.js';
+import { createSetTrackingHandler } from './routes/set-tracking.js';
+import { createSyncHandler } from './routes/sync.js';
 import type { SettingsService } from '../../services/settings-service.js';
 
 export function createWorktreeRoutes(
@@ -118,6 +120,18 @@ export function createWorktreeRoutes(
     requireValidWorktree,
     createPullHandler()
   );
+  router.post(
+    '/sync',
+    validatePathParams('worktreePath'),
+    requireValidWorktree,
+    createSyncHandler()
+  );
+  router.post(
+    '/set-tracking',
+    validatePathParams('worktreePath'),
+    requireValidWorktree,
+    createSetTrackingHandler()
+  );
   router.post(
     '/checkout-branch',
     validatePathParams('worktreePath'),

apps/server/src/routes/worktree/routes/push.ts

@@ -1,24 +1,24 @@
 /**
  * POST /push endpoint - Push a worktree branch to remote
  *
+ * Git business logic is delegated to push-service.ts.
+ *
  * Note: Git repository validation (isGitRepo, hasCommits) is handled by
  * the requireValidWorktree middleware in index.ts
  */
 
 import type { Request, Response } from 'express';
-import { exec } from 'child_process';
-import { promisify } from 'util';
 import { getErrorMessage, logError } from '../common.js';
-
-const execAsync = promisify(exec);
+import { performPush } from '../../../services/push-service.js';
 
 export function createPushHandler() {
   return async (req: Request, res: Response): Promise<void> => {
     try {
-      const { worktreePath, force, remote } = req.body as {
+      const { worktreePath, force, remote, autoResolve } = req.body as {
         worktreePath: string;
         force?: boolean;
         remote?: string;
+        autoResolve?: boolean;
       };
 
       if (!worktreePath) {
@@ -29,34 +29,28 @@ export function createPushHandler() {
         return;
       }
 
-      // Get branch name
-      const { stdout: branchOutput } = await execAsync('git rev-parse --abbrev-ref HEAD', {
-        cwd: worktreePath,
-      });
-      const branchName = branchOutput.trim();
+      const result = await performPush(worktreePath, { remote, force, autoResolve });
 
-      // Use specified remote or default to 'origin'
-      const targetRemote = remote || 'origin';
-
-      // Push the branch
-      const forceFlag = force ? '--force' : '';
-      try {
-        await execAsync(`git push -u ${targetRemote} ${branchName} ${forceFlag}`, {
-          cwd: worktreePath,
-        });
-      } catch {
-        // Try setting upstream
-        await execAsync(`git push --set-upstream ${targetRemote} ${branchName} ${forceFlag}`, {
-          cwd: worktreePath,
+      if (!result.success) {
+        const statusCode = isClientError(result.error ?? '') ? 400 : 500;
+        res.status(statusCode).json({
+          success: false,
+          error: result.error,
+          diverged: result.diverged,
+          hasConflicts: result.hasConflicts,
+          conflictFiles: result.conflictFiles,
         });
+        return;
       }
 
       res.json({
         success: true,
         result: {
-          branch: branchName,
-          pushed: true,
-          message: `Successfully pushed ${branchName} to ${targetRemote}`,
+          branch: result.branch,
+          pushed: result.pushed,
+          diverged: result.diverged,
+          autoResolved: result.autoResolved,
+          message: result.message,
         },
       });
     } catch (error) {
@@ -65,3 +59,15 @@ export function createPushHandler() {
     }
   };
 }
+
+/**
+ * Determine whether an error message represents a client error (400)
+ * vs a server error (500).
+ */
+function isClientError(errorMessage: string): boolean {
+  return (
+    errorMessage.includes('detached HEAD') ||
+    errorMessage.includes('rejected') ||
+    errorMessage.includes('diverged')
+  );
+}

apps/server/src/routes/worktree/routes/set-tracking.ts

@@ -0,0 +1,76 @@
+/**
+ * POST /set-tracking endpoint - Set the upstream tracking branch for a worktree
+ *
+ * Sets `git branch --set-upstream-to=<remote>/<branch>` for the current branch.
+ *
+ * Note: Git repository validation (isGitRepo, hasCommits) is handled by
+ * the requireValidWorktree middleware in index.ts
+ */
+
+import type { Request, Response } from 'express';
+import { execGitCommand } from '@automaker/git-utils';
+import { getErrorMessage, logError } from '../common.js';
+import { getCurrentBranch } from '../../../lib/git.js';
+
+export function createSetTrackingHandler() {
+  return async (req: Request, res: Response): Promise<void> => {
+    try {
+      const { worktreePath, remote, branch } = req.body as {
+        worktreePath: string;
+        remote: string;
+        branch?: string;
+      };
+
+      if (!worktreePath) {
+        res.status(400).json({ success: false, error: 'worktreePath required' });
+        return;
+      }
+
+      if (!remote) {
+        res.status(400).json({ success: false, error: 'remote required' });
+        return;
+      }
+
+      // Get current branch if not provided
+      let targetBranch = branch;
+      if (!targetBranch) {
+        try {
+          targetBranch = await getCurrentBranch(worktreePath);
+        } catch (err) {
+          res.status(400).json({
+            success: false,
+            error: `Failed to get current branch: ${getErrorMessage(err)}`,
+          });
+          return;
+        }
+
+        if (targetBranch === 'HEAD') {
+          res.status(400).json({
+            success: false,
+            error: 'Cannot set tracking in detached HEAD state.',
+          });
+          return;
+        }
+      }
+
+      // Set upstream tracking (pass local branch name as final arg to be explicit)
+      await execGitCommand(
+        ['branch', '--set-upstream-to', `${remote}/${targetBranch}`, targetBranch],
+        worktreePath
+      );
+
+      res.json({
+        success: true,
+        result: {
+          branch: targetBranch,
+          remote,
+          upstream: `${remote}/${targetBranch}`,
+          message: `Set tracking branch to ${remote}/${targetBranch}`,
+        },
+      });
+    } catch (error) {
+      logError(error, 'Set tracking branch failed');
+      res.status(500).json({ success: false, error: getErrorMessage(error) });
+    }
+  };
+}

apps/server/src/routes/worktree/routes/sync.ts

@@ -0,0 +1,66 @@
+/**
+ * POST /sync endpoint - Pull then push a worktree branch
+ *
+ * Performs a full sync operation: pull latest from remote, then push
+ * local commits. Handles divergence automatically.
+ *
+ * Git business logic is delegated to sync-service.ts.
+ *
+ * Note: Git repository validation (isGitRepo, hasCommits) is handled by
+ * the requireValidWorktree middleware in index.ts
+ */
+
+import type { Request, Response } from 'express';
+import { getErrorMessage, logError } from '../common.js';
+import { performSync } from '../../../services/sync-service.js';
+
+export function createSyncHandler() {
+  return async (req: Request, res: Response): Promise<void> => {
+    try {
+      const { worktreePath, remote } = req.body as {
+        worktreePath: string;
+        remote?: string;
+      };
+
+      if (!worktreePath) {
+        res.status(400).json({
+          success: false,
+          error: 'worktreePath required',
+        });
+        return;
+      }
+
+      const result = await performSync(worktreePath, { remote });
+
+      if (!result.success) {
+        const statusCode = result.hasConflicts ? 409 : 500;
+        res.status(statusCode).json({
+          success: false,
+          error: result.error,
+          hasConflicts: result.hasConflicts,
+          conflictFiles: result.conflictFiles,
+          conflictSource: result.conflictSource,
+          pulled: result.pulled,
+          pushed: result.pushed,
+        });
+        return;
+      }
+
+      res.json({
+        success: true,
+        result: {
+          branch: result.branch,
+          pulled: result.pulled,
+          pushed: result.pushed,
+          isFastForward: result.isFastForward,
+          isMerge: result.isMerge,
+          autoResolved: result.autoResolved,
+          message: result.message,
+        },
+      });
+    } catch (error) {
+      logError(error, 'Sync worktree failed');
+      res.status(500).json({ success: false, error: getErrorMessage(error) });
+    }
+  };
+}