working out the worker/execution interface

packs/core/actions/noop.sh

@@ -1,31 +1,77 @@
-#!/bin/bash
+#!/bin/sh
 # No Operation Action - Core Pack
 # Does nothing - useful for testing and placeholder workflows
+#
+# This script uses pure POSIX shell without external dependencies like jq or yq.
+# It reads parameters in DOTENV format from stdin until the delimiter.
 
 set -e
 
-# Parse parameters from environment variables
-MESSAGE="${ATTUNE_ACTION_MESSAGE:-}"
-EXIT_CODE="${ATTUNE_ACTION_EXIT_CODE:-0}"
+# Initialize variables
+message=""
+exit_code="0"
 
-# Validate exit code parameter
-if ! [[ "$EXIT_CODE" =~ ^[0-9]+$ ]]; then
-    echo "ERROR: exit_code must be a positive integer" >&2
-    exit 1
-fi
+# Read DOTENV-formatted parameters from stdin until delimiter
+while IFS= read -r line; do
+    # Check for parameter delimiter
+    case "$line" in
+        *"---ATTUNE_PARAMS_END---"*)
+            break
+            ;;
+        message=*)
+            # Extract value after message=
+            message="${line#message=}"
+            # Remove quotes if present (both single and double)
+            case "$message" in
+                \"*\")
+                    message="${message#\"}"
+                    message="${message%\"}"
+                    ;;
+                \'*\')
+                    message="${message#\'}"
+                    message="${message%\'}"
+                    ;;
+            esac
+            ;;
+        exit_code=*)
+            # Extract value after exit_code=
+            exit_code="${line#exit_code=}"
+            # Remove quotes if present
+            case "$exit_code" in
+                \"*\")
+                    exit_code="${exit_code#\"}"
+                    exit_code="${exit_code%\"}"
+                    ;;
+                \'*\')
+                    exit_code="${exit_code#\'}"
+                    exit_code="${exit_code%\'}"
+                    ;;
+            esac
+            ;;
+    esac
+done
 
-if [ "$EXIT_CODE" -lt 0 ] || [ "$EXIT_CODE" -gt 255 ]; then
+# Validate exit code parameter (must be numeric)
+case "$exit_code" in
+    ''|*[!0-9]*)
+        echo "ERROR: exit_code must be a positive integer" >&2
+        exit 1
+        ;;
+esac
+
+# Validate exit code range (0-255)
+if [ "$exit_code" -lt 0 ] || [ "$exit_code" -gt 255 ]; then
     echo "ERROR: exit_code must be between 0 and 255" >&2
     exit 1
 fi
 
 # Log message if provided
-if [ -n "$MESSAGE" ]; then
-    echo "[NOOP] $MESSAGE"
+if [ -n "$message" ]; then
+    echo "[NOOP] $message"
 fi
 
 # Output result
 echo "No operation completed successfully"
 
 # Exit with specified code
-exit "$EXIT_CODE"
+exit "$exit_code"