use udev for lvm & net

network.go

@@ -1,10 +1,10 @@
 package main
 
 import (
-	"net"
 	"os/exec"
 	"strings"
 
+	udev "github.com/jochenvg/go-udev"
 	"github.com/rs/zerolog/log"
 
 	config "novit.tech/direktil/pkg/bootstrapconfig"
@@ -16,14 +16,31 @@ func setupNetworks(cfg *config.Config) {
 		return
 	}
 
-	ifNames := make([]string, 0)
+	type Iface struct {
+		Name    string
+		AliasOf string
+	}
+
+	ifaces := make([]NameAliases, 0)
 	{
-		ifaces, err := net.Interfaces()
+		enum := new(udev.Udev).NewEnumerate()
+		enum.AddMatchSubsystem("net")
+
+		devs, err := enum.Devices()
 		if err != nil {
-			fatal("failed")
+			fatal("udev enumeration failed")
 		}
-		for _, iface := range ifaces {
-			ifNames = append(ifNames, iface.Name)
+
+		for _, dev := range devs {
+			iface := nameAliases(dev.Sysname(),
+				dev.PropertyValue("INTERFACE"),
+				dev.PropertyValue("ID_NET_NAME"),
+				dev.PropertyValue("ID_NET_NAME_PATH"),
+				dev.PropertyValue("ID_NET_NAME_MAC"),
+				dev.PropertyValue("ID_NET_NAME_SLOT"),
+			)
+			log.Info().Str("name", iface.Name).Any("aliases", iface.Aliases).Msg("found network device")
+			ifaces = append(ifaces, iface)
 		}
 	}
 
@@ -33,17 +50,9 @@ func setupNetworks(cfg *config.Config) {
 		log := log.With().Str("network", network.Name).Logger()
 		log.Info().Msg("setting up network")
 
-		// compute available names
-		if len(assigned) != 0 {
-			newNames := make([]string, 0, len(ifNames))
-			for _, n := range ifNames {
-				if assigned[n] {
-					continue
-				}
-				newNames = append(newNames, n)
-			}
-			ifNames = newNames
-		}
+		unassigned := filter(ifaces, func(iface NameAliases) bool {
+			return !assigned[iface.Name]
+		})
 
 		// assign envvars
 		envvars := make([]string, 0, 1+len(network.Interfaces))
@@ -53,13 +62,13 @@ func setupNetworks(cfg *config.Config) {
 			envvar := new(strings.Builder)
 			envvar.WriteString(match.Var)
 			envvar.WriteByte('=')
+			for i, m := range regexpSelectN(match.N, match.Regexps, unassigned) {
+				assigned[m] = true
 
-			for i, m := range regexpSelectN(match.N, match.Regexps, ifNames) {
 				if i != 0 {
 					envvar.WriteByte(' ')
 				}
 				envvar.WriteString(m)
-				assigned[m] = true
 			}
 
 			envvars = append(envvars, envvar.String())