new: [compose-core] add ability to enforce no-hooks from actions script

Keywords are added in a comment line with ``compose:`` prefix. Keywords
should be space separated. Example:

    #!/bin/bash
    ## compose: no-hooks foo bar

    # ... CODE ...

Signed-off-by: Valentin Lab <valentin.lab@kalysto.org>

bin/compose-core

@@ -2733,7 +2733,7 @@ _run_service_action_direct() {
     local service="$1" action="$2" charm _dummy project_name
     shift; shift
 
-    read-0 charm || true  ## against 'set -e' that could be setup in parent scripts
+    read-0 charm action_script_path || true  ## against 'set -e' that could be setup in parent scripts
 
     if read-0 _dummy || [ "$_dummy" ]; then
         print_syntax_error "$FUNCNAME: too many arguments in action descriptor"
@@ -2750,6 +2750,7 @@ _run_service_action_direct() {
         export METADATA_CONFIG=$(charm.metadata "$charm")
         export SERVICE_NAME=$service
         export ACTION_NAME=$action
+        export ACTION_SCRIPT_PATH="$action_script_path"
         export CONTAINER_NAME=$(get_top_master_service_for_service "$service")
         export DOCKER_BASE_IMAGE=$(service_base_docker_image "$CONTAINER_NAME")
         export SERVICE_DATASTORE="$DATASTORE/$service"
@@ -2764,7 +2765,7 @@ _run_service_action_relation() {
     local service="$1" action="$2" charm target_charm relation_name relation_config _dummy
     shift; shift
 
-    read-0 charm target_service target_charm relation_name relation_config || true
+    read-0 charm target_service target_charm relation_name relation_config action_script_path || true
 
     if read-0 _dummy || [ "$_dummy" ]; then
         print_syntax_error "$FUNCNAME: too many arguments in action descriptor"
@@ -2782,6 +2783,7 @@ _run_service_action_relation() {
         export RELATION_BASE_SERVICE="$service"
         export RELATION_BASE_CHARM="$charm"
         export ACTION_NAME=$action
+        export ACTION_SCRIPT_PATH="$action_script_path"
         export CONTAINER_NAME=$(get_top_master_service_for_service "$service")
         export DOCKER_BASE_IMAGE=$(service_base_docker_image "$CONTAINER_NAME")
         export SERVICE_DATASTORE="$DATASTORE/$service"
@@ -2845,7 +2847,8 @@ export -f get_relation_data_file
 
 has_service_action () {
     local service="$1" action="$2" cache_file="$state_tmpdir/$FUNCNAME.cache.$1" \
-          charm target_charm relation_name target_service relation_config _tech_dep
+          charm target_charm relation_name target_service relation_config _tech_dep \
+          path
     if [ -e "$cache_file" ]; then
         # debug "$FUNCNAME: cache hit ($*)"
         cat "$cache_file"
@@ -2856,8 +2859,8 @@ has_service_action () {
 
     ## Action directly provided ?
 
-    if charm.has_direct_action "$charm" "$action" >/dev/null; then
-        echo -en "direct\0$charm" | tee "$cache_file"
+    if path=$(charm.has_direct_action "$charm" "$action"); then
+        p0 "direct" "$charm" "$path" | tee "$cache_file"
         return 0
     fi
 
@@ -2865,8 +2868,8 @@ has_service_action () {
 
     while read-0 relation_name target_service relation_config _tech_dep; do
         target_charm=$(get_service_charm "$target_service") || return 1
-        if charm.has_relation_action "$target_charm" "$relation_name" "$action" >/dev/null; then
-            echo -en "relation\0$charm\0$target_service\0$target_charm\0$relation_name\0$relation_config" | tee "$cache_file"
+        if path=$(charm.has_relation_action "$target_charm" "$relation_name" "$action"); then
+            p0 "relation" "$charm" "$target_service" "$target_charm" "$relation_name" "$relation_config" "$path" | tee "$cache_file"
             return 0
         fi
     done < <(get_service_relations "$service")
@@ -4229,10 +4232,11 @@ if [ -z "$is_docker_compose_action" -a "$action" ]; then
             read-0 action_type
             case "$action_type" in
                 "relation")
-                    read-0 _ target_service _target_charm relation_name
+                    read-0 _ target_service _target_charm relation_name _ action_script_path
                     debug "Found action $DARKYELLOW${action_service}$NORMAL/$DARKBLUE$relation_name$NORMAL/$DARKCYAN$action$NORMAL (in $DARKYELLOW$target_service$NORMAL)"
                     ;;
                 "direct")
+                    read-0 _ action_script_path
                     debug "Found action $DARKYELLOW${action_service}$NORMAL.$DARKCYAN$action$NORMAL"
                     ;;
             esac
@@ -4313,6 +4317,17 @@ case "$action" in
     *)
         if [ "$is_service_action" ]; then
             full_init=true
+            keywords=($(egrep "^#*\s*compose:" "$action_script_path" | cut -f 2- -d:))
+            for keyword in "${keywords[@]}"; do
+                case "$keyword" in
+                    no-hooks)
+                        full_init=
+                        ;;
+                    hooks)
+                        full_init=true
+                        ;;
+                esac
+            done
         fi
         ;;
 esac