14.04.2026 Update

network/apply.go

@@ -6,34 +6,45 @@ import (
 	"strings"
 )
 
-// IfDown brings an interface down via ifdown (or ip link set down as fallback).
-func IfDown(name string) error {
-	out, err := exec.Command("ifdown", "--force", name).CombinedOutput()
+// LinkDown sets admin state down without deconfiguring (ip link set <name> down).
+func LinkDown(name string) error {
+	out, err := exec.Command("ip", "link", "set", name, "down").CombinedOutput()
 	if err != nil {
-		// fallback: ip link set down
-		out2, err2 := exec.Command("ip", "link", "set", name, "down").CombinedOutput()
-		if err2 != nil {
-			return fmt.Errorf("ifdown %s: %s\nip fallback: %s", name, strings.TrimSpace(string(out)), strings.TrimSpace(string(out2)))
-		}
+		return fmt.Errorf("ip link set down %s: %s", name, strings.TrimSpace(string(out)))
 	}
 	return nil
 }
 
-// IfUp brings an interface up via ifup (or ip link set up as fallback).
-func IfUp(name string) error {
-	out, err := exec.Command("ifup", name).CombinedOutput()
+// LinkUp sets admin state up without re-running ifup (ip link set <name> up).
+func LinkUp(name string) error {
+	out, err := exec.Command("ip", "link", "set", name, "up").CombinedOutput()
 	if err != nil {
-		out2, err2 := exec.Command("ip", "link", "set", name, "up").CombinedOutput()
-		if err2 != nil {
-			return fmt.Errorf("ifup %s: %s\nip fallback: %s", name, strings.TrimSpace(string(out)), strings.TrimSpace(string(out2)))
-		}
+		return fmt.Errorf("ip link set up %s: %s", name, strings.TrimSpace(string(out)))
+	}
+	return nil
+}
+
+// IfDown brings an interface down via ifdown --force.
+func IfDown(name string) error {
+	out, err := exec.Command("ifdown", "--force", name).CombinedOutput()
+	if err != nil {
+		return fmt.Errorf("ifdown %s: %s", name, strings.TrimSpace(string(out)))
+	}
+	return nil
+}
+
+// IfUp brings an interface up via ifup --force.
+func IfUp(name string) error {
+	out, err := exec.Command("ifup", "--force", name).CombinedOutput()
+	if err != nil {
+		return fmt.Errorf("ifup %s: %s", name, strings.TrimSpace(string(out)))
 	}
 	return nil
 }
 
 // IfRestart brings an interface down then up.
 func IfRestart(name string) error {
-	_ = IfDown(name) // ignore "already down" errors
+	_ = IfDown(name)
 	return IfUp(name)
 }