From 70be8f9f4493777637bdb85af9c7e180a8908f24 Mon Sep 17 00:00:00 2001
From: Affaan Mustafa <affaan@dcube.ai>
Date: Thu, 2 Apr 2026 17:07:32 -0700
Subject: [PATCH] fix: add POSIX fallback for observer lazy-start

---
 skills/continuous-learning-v2/hooks/observe.sh | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/skills/continuous-learning-v2/hooks/observe.sh b/skills/continuous-learning-v2/hooks/observe.sh
index 910942a5..487c7635 100755
--- a/skills/continuous-learning-v2/hooks/observe.sh
+++ b/skills/continuous-learning-v2/hooks/observe.sh
@@ -352,7 +352,7 @@ if [ "$OBSERVER_ENABLED" = "true" ]; then
         fi
       ) 9>"$LAZY_START_LOCK"
     else
-      # macOS fallback: use lockfile if available, otherwise skip
+      # macOS fallback: use lockfile if available, otherwise mkdir-based lock
       if command -v lockfile >/dev/null 2>&1; then
         # Use subshell to isolate exit and add trap for cleanup
         (
@@ -365,6 +365,17 @@ if [ "$OBSERVER_ENABLED" = "true" ]; then
           fi
           rm -f "$LAZY_START_LOCK" 2>/dev/null || true
         )
+      else
+        # POSIX fallback: mkdir is atomic -- fails if dir already exists
+        (
+          trap 'rmdir "${LAZY_START_LOCK}.d" 2>/dev/null || true' EXIT
+          mkdir "${LAZY_START_LOCK}.d" 2>/dev/null || exit 0
+          _CHECK_OBSERVER_RUNNING "${PROJECT_DIR}/.observer.pid" || true
+          _CHECK_OBSERVER_RUNNING "${CONFIG_DIR}/.observer.pid" || true
+          if [ ! -f "${PROJECT_DIR}/.observer.pid" ] && [ ! -f "${CONFIG_DIR}/.observer.pid" ]; then
+            nohup "${SKILL_ROOT}/agents/start-observer.sh" start >/dev/null 2>&1 &
+          fi
+        )
       fi
     fi
   fi