run the whole spec dir by default, gate docker-backed specs on a variable

shellspec --tag ~integration filtered out untagged examples too, which
silently emptied the suite.

.shellspec

@@ -1,4 +1,4 @@
 --require spec_helper
 --shell bash
---default-path spec/unit:spec/golden
+--default-path spec
 --pattern "*_spec.sh"

Makefile

@@ -12,7 +12,7 @@ test-unit: ## Run unit tests only
 test-golden: ## Run golden tests only (MYOS_ENGINE=legacy|cli)
 	$(SHELLSPEC) spec/golden
 test-integration: ## Run tests needing a real docker daemon
-	$(SHELLSPEC) --tag integration
+	MYOS_INTEGRATION=1 $(SHELLSPEC) spec/integration
 golden-record: ## Re-record golden expectations from the legacy engine
 	spec/golden/record.sh $(CASES)
 lint: ## shellcheck all shell sources

spec/spec_helper.sh

@@ -4,3 +4,8 @@ MYOS_ROOT=${MYOS_ROOT:-$SHELLSPEC_PROJECT_ROOT}
 SPEC_DIR=$MYOS_ROOT/spec
 export MYOS_ROOT SPEC_DIR
 . "$SPEC_DIR/support/run.sh"
+
+# Specs under spec/integration and spec/e2e drive a real docker daemon.
+# They are skipped unless MYOS_INTEGRATION=1 / MYOS_E2E=1 (make test-integration).
+myos_needs_docker() { [ -n "${MYOS_INTEGRATION:-}" ]; }
+myos_needs_swarm()  { [ -n "${MYOS_E2E:-}" ]; }