Maint: upgrade golibs and env error wrapping

internal/configuration/firewall.go

@@ -1,6 +1,7 @@
 package configuration
 
 import (
+	"fmt"
 	"net"
 	"strings"
 
@@ -53,12 +54,12 @@ func (settings *Firewall) lines() (lines []string) {
 func (settings *Firewall) read(r reader) (err error) {
 	settings.Enabled, err = r.env.OnOff("FIREWALL", params.Default("on"))
 	if err != nil {
-		return err
+		return fmt.Errorf("environment variable FIREWALL: %w", err)
 	}
 
 	settings.Debug, err = r.env.OnOff("FIREWALL_DEBUG", params.Default("off"))
 	if err != nil {
-		return err
+		return fmt.Errorf("environment variable FIREWALL_DEBUG: %w", err)
 	}
 
 	if err := settings.readVPNInputPorts(r.env); err != nil {
@@ -74,16 +75,25 @@ func (settings *Firewall) read(r reader) (err error) {
 
 func (settings *Firewall) readVPNInputPorts(env params.Env) (err error) {
 	settings.VPNInputPorts, err = readCSVPorts(env, "FIREWALL_VPN_INPUT_PORTS")
-	return err
+	if err != nil {
+		return fmt.Errorf("environment variable FIREWALL_VPN_INPUT_PORTS: %w", err)
+	}
+	return nil
 }
 
 func (settings *Firewall) readInputPorts(env params.Env) (err error) {
 	settings.InputPorts, err = readCSVPorts(env, "FIREWALL_INPUT_PORTS")
-	return err
+	if err != nil {
+		return fmt.Errorf("environment variable FIREWALL_INPUT_PORTS: %w", err)
+	}
+	return nil
 }
 
 func (settings *Firewall) readOutboundSubnets(r reader) (err error) {
 	retroOption := params.RetroKeys([]string{"EXTRA_SUBNETS"}, r.onRetroActive)
 	settings.OutboundSubnets, err = readCSVIPNets(r.env, "FIREWALL_OUTBOUND_SUBNETS", retroOption)
-	return err
+	if err != nil {
+		return fmt.Errorf("environment variable FIREWALL_OUTBOUND_SUBNETS: %w", err)
+	}
+	return nil
 }