94 lines
2.2 KiB
Go
94 lines
2.2 KiB
Go
package network
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import (
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"fmt"
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"os/exec"
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"strings"
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)
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// IfDown brings an interface down via ifdown (or ip link set down as fallback).
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func IfDown(name string) error {
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out, err := exec.Command("ifdown", "--force", name).CombinedOutput()
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if err != nil {
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// fallback: ip link set down
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out2, err2 := exec.Command("ip", "link", "set", name, "down").CombinedOutput()
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if err2 != nil {
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return fmt.Errorf("ifdown %s: %s\nip fallback: %s", name, strings.TrimSpace(string(out)), strings.TrimSpace(string(out2)))
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}
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}
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return nil
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}
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// IfUp brings an interface up via ifup (or ip link set up as fallback).
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func IfUp(name string) error {
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out, err := exec.Command("ifup", name).CombinedOutput()
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if err != nil {
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out2, err2 := exec.Command("ip", "link", "set", name, "up").CombinedOutput()
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if err2 != nil {
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return fmt.Errorf("ifup %s: %s\nip fallback: %s", name, strings.TrimSpace(string(out)), strings.TrimSpace(string(out2)))
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}
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}
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return nil
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}
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// IfRestart brings an interface down then up.
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func IfRestart(name string) error {
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_ = IfDown(name) // ignore "already down" errors
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return IfUp(name)
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}
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// ApplyPending merges pending configs into /etc/network/interfaces,
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// writes the file, and restarts affected interfaces.
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// Returns a per-interface error map (nil key = write error).
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func ApplyPending() map[string]error {
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errs := map[string]error{}
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pending := GetAllPending()
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if len(pending) == 0 {
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return errs
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}
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// Read current file config
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configs, err := ParseConfig()
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if err != nil {
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errs["__parse__"] = err
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return errs
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}
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// Merge
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for name, cfg := range pending {
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configs[name] = cfg
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}
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// Write file
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if err := WriteConfig(configs); err != nil {
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errs["__write__"] = err
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return errs
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}
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// Restart each changed interface
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for name := range pending {
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if name == "lo" {
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ClearPendingConfig(name)
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continue
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}
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// For VLAN interfaces ensure the kernel interface exists before ifup.
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if IsVLAN(name) {
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if err := EnsureVLANExists(name); err != nil {
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errs[name] = err
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continue
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}
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}
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_ = IfDown(name)
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if cfg := configs[name]; cfg != nil && cfg.Auto {
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if err := IfUp(name); err != nil {
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errs[name] = err
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continue
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}
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}
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ClearPendingConfig(name)
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}
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return errs
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}
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