repo: support post-sync hook via <repo-hooks>

This patch adds support for a `post-sync` hook, defined via the `<repo-hooks>` tag
in the manifest. It allows teams to automatically run a script after successful
`repo sync`, commonly needed to initialize workspaces or install project-wide Git hooks.

Example usage:

<project name="myorg/repo-hooks" path="hooks" revision="main" />
<repo-hooks in-project="myorg/repo-hooks" enabled-list="post-sync">
  <hook name="post-sync" />
</repo-hooks>

The corresponding hook script (`post-sync.py`) must be located in the root of the `hooks_project`.

This hook will not block sync completion even if it fails.

Change-Id: I69f3158f0fc319d73a85028d6e90fea02c1dc8c8
Signed-off-by: Kenny Cheng <chao.shun.cheng.tw@gmail.com>

subcmds/sync.py

@@ -79,6 +79,7 @@ from repo_logging import RepoLogger
 from repo_trace import Trace
 import ssh
 from wrapper import Wrapper
+from hooks import RepoHook
 
 
 _ONE_DAY_S = 24 * 60 * 60
@@ -1736,6 +1737,22 @@ later is required to fix a server side protocol bug.
         errors = []
         try:
             self._ExecuteHelper(opt, args, errors)
+
+            try:
+                manifest = self.manifest
+                post_sync_hook = RepoHook(
+                    hook_type="post-sync",
+                    hooks_project=manifest.repo_hooks_project,
+                    repo_topdir=manifest.topdir,
+                    manifest_url=manifest.manifestProject.GetRemote("origin").url,
+                    bypass_hooks=False,
+                    allow_all_hooks=True,
+                    ignore_hooks=True,
+                )
+                post_sync_hook.Run()
+            except Exception as e:
+                print(f"Warning: post-sync hook failed: {e}")
+
         except (RepoExitError, RepoChangedException):
             raise
         except (KeyboardInterrupt, Exception) as e: