refactor(doorbell-touch): extract lockfile logic to shared script

sketches/doorbell-touch/mise.toml

@@ -28,17 +28,8 @@ arduino-cli compile --fqbn "$FQBN" --libraries ./libraries $LIBS --build-propert
 description = "Upload (uses BOARD env var)"
 run = """
 source ./boards/$BOARD/board-config.sh
-
-LOCKFILE="/tmp/doorbell-$BOARD.lock"
-if [ -f "$LOCKFILE" ]; then
-    echo "Error: Another instance is running (lockfile exists: $LOCKFILE)"
-    echo "Remove with: rm $LOCKFILE"
-    exit 1
-fi
-trap 'rm -f "$LOCKFILE"' EXIT
-touch "$LOCKFILE"
-
-echo "Acquired lock: $LOCKFILE"
+source ./scripts/lockfile.sh
+FORCE=1 TASK_NAME=upload acquire_lock || exit 1
 
 PORT="${PORT:-$PORT}"
 arduino-cli compile --fqbn "$FQBN" --libraries ./libraries $LIBS --build-property "compiler.cpp.extra_flags=$OPTS" --warnings default ./boards/$BOARD && \
@@ -49,17 +40,8 @@ arduino-cli upload --fqbn "$FQBN" --port "$PORT" ./boards/$BOARD
 description = "Monitor (uses BOARD env var)"
 run = """
 source ./boards/$BOARD/board-config.sh
-
-LOCKFILE="/tmp/doorbell-$BOARD.lock"
-if [ -f "$LOCKFILE" ]; then
-    echo "Error: Another instance is running (lockfile exists: $LOCKFILE)"
-    echo "Remove with: rm $LOCKFILE"
-    exit 1
-fi
-trap 'rm -f "$LOCKFILE"' EXIT
-touch "$LOCKFILE"
-
-echo "Acquired lock: $LOCKFILE (Ctrl+C to release)"
+source ./scripts/lockfile.sh
+acquire_lock || exit 1
 
 PORT="${PORT:-$PORT}"
 TARGET="$(readlink -f "$PORT" 2>/dev/null || echo "$PORT")"
@@ -70,27 +52,19 @@ arduino-cli monitor -p "$TARGET" --config baudrate=115200
 description = "Show tio command to run in separate terminal"
 run = """
 source ./boards/$BOARD/board-config.sh
-
-LOCKFILE="/tmp/doorbell-$BOARD.lock"
-if [ -f "$LOCKFILE" ]; then
-    echo "Error: Another instance is running (lockfile exists: $LOCKFILE)"
-    echo "Remove with: rm $LOCKFILE"
-    exit 1
-fi
-trap 'rm -f "$LOCKFILE"' EXIT
-touch "$LOCKFILE"
-
-echo "Acquired lock: $LOCKFILE (Ctrl+C to release)"
+source ./scripts/lockfile.sh
+acquire_lock || exit 1
 
 PORT="${PORT:-$PORT}"
 TARGET="$(readlink -f "$PORT" 2>/dev/null || echo "$PORT")"
 tio --map INLCRNL "$TARGET" -e
 """
 
-[tasks.monitor-screen-kill]
-description = "Kill tio (Ctrl+C in the terminal)"
+[tasks.kill]
+description = "Kill running monitor/upload for BOARD"
 run = """
-echo "Press Ctrl+C in the tio terminal to exit"
+source ./scripts/lockfile.sh
+kill_locked
 """
 
 [tasks.install-libs-shared]

sketches/doorbell-touch/scripts/lockfile.sh

@@ -0,0 +1,65 @@
+#!/usr/bin/env bash
+# Lockfile helper for doorbell build harness
+# Source this from mise tasks
+
+LOCKFILE="/tmp/doorbell-${BOARD:-esp32-32e-4}.lock"
+
+acquire_lock() {
+    if [ -f "$LOCKFILE" ]; then
+        OLD_PID=$(cat "$LOCKFILE" 2>/dev/null)
+        if [ -n "$OLD_PID" ] && kill -0 "$OLD_PID" 2>/dev/null; then
+            if [ "${FORCE:-}" = "1" ]; then
+                echo "Force: Killing existing process (PID: $OLD_PID)..."
+                kill "$OLD_PID" 2>/dev/null
+                sleep 1
+                kill -9 "$OLD_PID" 2>/dev/null
+                echo "Killed PID $OLD_PID"
+            else
+                echo "Error: Another instance is running (PID: $OLD_PID)"
+                echo "Kill with: mise run kill BOARD=$BOARD"
+                echo "Or force with: FORCE=1 mise run $TASK_NAME BOARD=$BOARD"
+                return 1
+            fi
+        else
+            echo "Stale lockfile found, removing..."
+            rm -f "$LOCKFILE"
+        fi
+    fi
+    trap 'rm -f "$LOCKFILE"' EXIT
+    echo "$$" > "$LOCKFILE"
+    echo "Acquired lock: $LOCKFILE (PID: $$)"
+    return 0
+}
+
+release_lock() {
+    rm -f "$LOCKFILE"
+}
+
+kill_locked() {
+    if [ ! -f "$LOCKFILE" ]; then
+        echo "No lockfile found: $LOCKFILE"
+        return 1
+    fi
+
+    OLD_PID=$(cat "$LOCKFILE" 2>/dev/null)
+    if [ -z "$OLD_PID" ]; then
+        echo "Lockfile is empty, removing..."
+        rm -f "$LOCKFILE"
+        return 0
+    fi
+
+    if kill -0 "$OLD_PID" 2>/dev/null; then
+        echo "Killing PID $OLD_PID..."
+        kill "$OLD_PID" 2>/dev/null
+        sleep 1
+        if kill -0 "$OLD_PID" 2>/dev/null; then
+            echo "Force killing PID $OLD_PID..."
+            kill -9 "$OLD_PID" 2>/dev/null
+        fi
+        echo "Killed PID $OLD_PID"
+    else
+        echo "Process $OLD_PID not running (stale lockfile)"
+    fi
+    rm -f "$LOCKFILE"
+    echo "Lockfile removed"
+}