use udev for lvm & net

lvm.go

@@ -8,7 +8,9 @@ import (
 	"path/filepath"
 	"sort"
 	"strconv"
+	"syscall"
 
+	udev "github.com/jochenvg/go-udev"
 	"github.com/rs/zerolog/log"
 
 	config "novit.tech/direktil/pkg/bootstrapconfig"
@@ -90,25 +92,47 @@ func setupVG(vg config.LvmVG) {
 		log.Info().Msg("LVM VG does not exists, creating")
 	}
 
-	devNames := make([]string, 0)
-	err = filepath.Walk("/dev", func(n string, fi fs.FileInfo, err error) error {
-		if fi.Mode().Type() == os.ModeDevice {
-			devNames = append(devNames, n)
+	devNames := make([]NameAliases, 0)
+	{
+		devRefs := map[uint64]*NameAliases{}
+
+		enum := new(udev.Udev).NewEnumerate()
+		enum.AddMatchSubsystem("block")
+
+		devs, err := enum.Devices()
+		if err != nil {
+			fatal("udev enumeration failed")
+		}
+
+		for _, dev := range devs {
+			num := dev.Devnum()
+
+			n := dev.PropertyValue("DEVNAME")
+			idx := len(devNames)
+			devNames = append(devNames, nameAlias(n))
+
+			ref := uint64(num.Major())<<8 | uint64(num.Minor())
+			devRefs[ref] = &devNames[idx]
+		}
+
+		err = filepath.Walk("/dev", func(n string, fi fs.FileInfo, err error) error {
+			if fi.Mode().Type() == os.ModeDevice {
+				stat := fi.Sys().(*syscall.Stat_t)
+				ref := stat.Rdev
+				if na := devRefs[ref]; na != nil {
+					na.AddAlias(n)
+				}
+			}
+			return err
+		})
+		if err != nil {
+			fatalf("failed to walk /dev: %v", err)
 		}
-		return err
-	})
-	if err != nil {
-		fatalf("failed to walk /dev: %v", err)
 	}
 
-	devNames = filter(devNames, func(v string) bool {
-		for _, pv := range pvs.PVs() {
-			if v == pv.Name {
-				return false
-			}
-		}
-		return true
-	})
+	for _, dev := range devNames {
+		log.Info().Str("name", dev.Name).Any("aliases", dev.Aliases).Msg("found block device")
+	}
 
 	m := regexpSelectN(vg.PVs.N, vg.PVs.Regexps, devNames)
 	if len(m) == 0 {