From bd5d787a3b90bfa2f9c0879d42455ef560448d06 Mon Sep 17 00:00:00 2001
From: Sal <ss-o@users.noreply.github.com>
Date: Sat, 29 Aug 2026 02:10:17 +0100
Subject: [PATCH] fix(trunk): anchor git-diff-check at the workspace root

git-diff-check invoked `git diff --check ${target}` from Trunk's
sandbox copy of the target. This repository is consumed as a submodule, so
its `.git` is a file whose gitdir is relative to the superproject. The
sandbox copy invalidates that relative path and every run failed with:

    fatal: not a git repository: (null)

Anchor the command at ${workspace} so repository discovery resolves against
the real checkout instead of the sandbox directory.

Verified: `trunk check --no-fix --ci --filter=git-diff-check` reports
"No issues" where it previously exited 128.
---
 .trunk/trunk.yaml | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/.trunk/trunk.yaml b/.trunk/trunk.yaml
index 7cdfae6..686c010 100644
--- a/.trunk/trunk.yaml
+++ b/.trunk/trunk.yaml
@@ -13,6 +13,13 @@ repo:
     name: src
 lint:
   definitions:
+    # This repository is consumed as a submodule, so `.git` is a file whose
+    # gitdir is relative to the superproject. Trunk's sandbox copy breaks that
+    # relative path, so anchor the command at the real workspace.
+    - name: git-diff-check
+      commands:
+        - name: lint
+          run: git -C "${workspace}" diff --check ${target}
     - name: shfmt
       commands:
         - name: format