platform: modularize api/gui, add docs-tests-web foundation, and refresh root config

selective-vpn-api/app/transport_backends_adapter_systemd_action.go

@@ -0,0 +1,73 @@
+package app
+
+import (
+	"fmt"
+	"strings"
+)
+
+func (transportSystemdBackend) ID() string { return "systemd" }
+
+func (transportSystemdBackend) Action(client TransportClient, action string) transportBackendActionResult {
+	action = strings.ToLower(strings.TrimSpace(action))
+	if action != "start" && action != "stop" && action != "restart" {
+		return transportBackendActionResult{
+			OK:       false,
+			Code:     "TRANSPORT_BACKEND_ACTION_FAILED",
+			Message:  "unsupported action: " + action,
+			ExitCode: -1,
+		}
+	}
+	units, errCode, errMsg := transportSystemdActionUnits(client, action)
+	if len(units) == 0 {
+		return transportBackendActionResult{
+			OK:       false,
+			Code:     errCode,
+			Message:  errMsg,
+			ExitCode: -1,
+		}
+	}
+
+	aggOut := make([]string, 0, len(units))
+	aggErr := make([]string, 0, len(units))
+
+	netnsEnabled := transportNetnsEnabled(client)
+	if res := transportSystemdRunPreActionHooks(client, action, units, netnsEnabled, &aggOut, &aggErr); res != nil {
+		return *res
+	}
+	if res := transportSystemdRunActionUnits(client, action, units, &aggOut, &aggErr); res != nil {
+		return *res
+	}
+	if netnsEnabled && action == "stop" && transportNetnsAutoCleanup(client) {
+		transportSystemdRunPostStopCleanup(client, action, &aggOut, &aggErr)
+	}
+
+	msg := fmt.Sprintf("systemctl %s ok (%s)", action, strings.Join(units, ", "))
+	if len(aggErr) > 0 {
+		msg += "; with warnings"
+	}
+	return transportBackendActionResult{
+		OK:       true,
+		ExitCode: 0,
+		Stdout:   strings.Join(aggOut, "\n"),
+		Stderr:   strings.Join(aggErr, "\n"),
+		Message:  msg,
+	}
+}
+
+func transportSystemdStopMissingUnitNoop(stdout, stderr string, exitCode int, err error) bool {
+	return transportSystemdUnitMissingError(stdout, stderr, exitCode, err)
+}
+
+func transportSystemdUnitMissingError(stdout, stderr string, exitCode int, err error) bool {
+	if err == nil && exitCode == 0 {
+		return false
+	}
+	msg := strings.ToLower(strings.TrimSpace(stderr + "\n" + stdout))
+	if msg == "" {
+		return false
+	}
+	return strings.Contains(msg, "not loaded") ||
+		strings.Contains(msg, "not found") ||
+		strings.Contains(msg, "could not be found") ||
+		strings.Contains(msg, "unknown unit")
+}