first commit

network/apply.go

@@ -0,0 +1,86 @@
+package network
+
+import (
+	"fmt"
+	"os/exec"
+	"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()
+	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 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()
+	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 nil
+}
+
+// IfRestart brings an interface down then up.
+func IfRestart(name string) error {
+	_ = IfDown(name) // ignore "already down" errors
+	return IfUp(name)
+}
+
+// ApplyPending merges pending configs into /etc/network/interfaces,
+// writes the file, and restarts affected interfaces.
+// Returns a per-interface error map (nil key = write error).
+func ApplyPending() map[string]error {
+	errs := map[string]error{}
+
+	pending := GetAllPending()
+	if len(pending) == 0 {
+		return errs
+	}
+
+	// Read current file config
+	configs, err := ParseConfig()
+	if err != nil {
+		errs["__parse__"] = err
+		return errs
+	}
+
+	// Merge
+	for name, cfg := range pending {
+		configs[name] = cfg
+	}
+
+	// Write file
+	if err := WriteConfig(configs); err != nil {
+		errs["__write__"] = err
+		return errs
+	}
+
+	// Restart each changed interface
+	for name := range pending {
+		if name == "lo" {
+			ClearPendingConfig(name)
+			continue
+		}
+		_ = IfDown(name)
+		if cfg := configs[name]; cfg != nil && cfg.Auto {
+			if err := IfUp(name); err != nil {
+				errs[name] = err
+				continue
+			}
+		}
+		ClearPendingConfig(name)
+	}
+
+	return errs
+}