mirror of
https://github.com/siderolabs/talos.git
synced 2025-08-26 09:01:17 +02:00
117 lines
2.8 KiB
Go
117 lines
2.8 KiB
Go
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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// Package udevd is a library for working with uevent messages from the netlink
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// socket.
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package main
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import (
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"fmt"
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"log"
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"os"
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"path/filepath"
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"github.com/mdlayher/kobject"
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"github.com/pkg/errors"
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"github.com/talos-systems/talos/internal/app/udevd/internal/drivers/scsi"
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)
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func init() {
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log.SetFlags(log.Lshortfile | log.Ldate | log.Lmicroseconds | log.Ltime)
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}
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func watch() error {
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client, err := kobject.New()
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if err != nil {
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return err
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}
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for {
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event, err := client.Receive()
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if err != nil {
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log.Printf("failed to receive event: %v", err)
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continue
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}
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if err = handle(event); err != nil {
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log.Printf("%v", err)
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}
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}
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}
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// nolint: gocyclo
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func handle(event *kobject.Event) (err error) {
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if event.Subsystem != "block" {
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return nil
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}
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var devname, devtype, partn string
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var ok bool
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if devname, ok = event.Values["DEVNAME"]; !ok {
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return errors.Errorf("DEVNAME not found\n")
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}
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devpath := filepath.Join("/dev", devname)
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devtype = event.Values["DEVTYPE"]
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var device *scsi.Device
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if device, err = scsi.NewDevice(devpath); err != nil {
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return errors.Errorf("error opening %s: %+v\n", devpath, err)
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}
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// nolint: errcheck
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defer device.Close()
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if err = device.Identify(); err != nil {
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return errors.Errorf("error identifying %s: %+v\n", devpath, err)
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}
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if device.WWN == "" {
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log.Printf("no wwn found for %s\n", devpath)
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return nil
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}
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oldname := fmt.Sprintf("../../%s", devname)
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newname := fmt.Sprintf("/dev/disk/by-id/wwn-%s", device.WWN)
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if partn, ok = event.Values["PARTN"]; ok && devtype == "partition" {
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newname += "-part" + partn
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}
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switch event.Action {
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case kobject.Add:
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log.Printf("creating symlink %s -> %s\n", newname, oldname)
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if _, err = os.Lstat(newname); err == nil {
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if err = os.Remove(newname); err != nil {
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log.Printf("failed to remove symlink: %v\n", err)
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}
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}
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if err = os.Symlink(oldname, newname); err != nil {
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return errors.Errorf("failed to create symlink %s: %+v", newname, err)
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}
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case kobject.Remove:
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log.Printf("removing symlink %s -> %s\n", newname, oldname)
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if _, err = os.Lstat(newname); err == nil {
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if err = os.Remove(newname); err != nil {
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log.Printf("failed to remove symlink: %v\n", err)
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}
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}
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default:
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log.Printf("unhandled action %q on %s", event.Action, devname)
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}
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return nil
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}
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func main() {
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if err := os.MkdirAll("/dev/disk/by-id", os.ModeDir); err != nil && !os.IsExist(err) {
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log.Printf("failed to create directoy /dev/disk/by-id: %+v\n", err)
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os.Exit(1)
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}
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if err := watch(); err != nil {
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log.Printf("failed watch uevents: %+v\n", err)
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os.Exit(1)
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}
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}
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