new: added support of ``docker-compose`` options in ``compose.yml``.

bin/compose

@@ -225,6 +225,31 @@ _get_docker_compose_links() {
     merge_yaml_str "${deps[@]}" | tee "$cache_file"
 }
 
+
+_get_docker_compose_opts() {
+    local service="$1" cache_file="$state_tmpdir/$FUNCNAME.cache.$(echo "$*" | md5_compat)" \
+          links charm charm_part master_charm
+    if [ -z "$service" ]; then
+        print_syntax_error "$FUNCNAME: Please specify a service as first argument."
+        return 1
+    fi
+
+    if [ -e "$cache_file" ]; then
+        # debug "$FUNCNAME: cache hit ($*)"
+        cat "$cache_file"
+        return 0
+    fi
+
+    compose_def="$(get_compose_service_def "$service")" || return 1
+    master_charm="$(_get_top_master_charm_for_service "$service")"
+    docker_compose_opts=$(echo "$compose_def" | shyaml get-value "docker-compose" 2>/dev/null)
+
+    if [ "$docker_compose_opts" ]; then
+        yaml_key_val_str "$master_charm" "$docker_compose_opts"
+    fi | tee "$cache_file"
+}
+
+
 ##
 ## By Reading the metadata.yml, we create a docker-compose.yml mixin.
 ## Some metadata.yml (of subordinates) will indeed modify other
@@ -247,6 +272,7 @@ _get_docker_compose_service_mixin() {
     ## The compose part
 
     links_yaml=$(_get_docker_compose_links "$service") || return 1
+    docker_compose_options=$(_get_docker_compose_opts "$service") || return 1
 
     ## the charm part
 
@@ -257,7 +283,7 @@ _get_docker_compose_service_mixin() {
     ## Merge results
     if [ "$charm_part" ]; then
         charm_yaml="$(yaml_key_val_str "$master_charm" "$charm_part")" || return 1
-        merge_yaml_str "$links_yaml" "$charm_yaml"
+        merge_yaml_str "$links_yaml" "$charm_yaml" "$docker_compose_options"
     else
         echo "$links_yaml"
     fi > "$cache_file"