boot v2 progress: disks, ssh, success...

network.go

@@ -0,0 +1,75 @@
+package main
+
+import (
+	"log"
+	"net"
+	"os/exec"
+	"strings"
+
+	"novit.nc/direktil/initrd/config"
+)
+
+func setupNetworks(cfg *config.Config) {
+	if len(cfg.Networks) == 0 {
+		log.Print("no networks configured.")
+		return
+	}
+
+	ifNames := make([]string, 0)
+	{
+		ifaces, err := net.Interfaces()
+		if err != nil {
+			fatal("failed")
+		}
+		for _, iface := range ifaces {
+			ifNames = append(ifNames, iface.Name)
+		}
+	}
+
+	assigned := map[string]bool{}
+
+	for _, network := range cfg.Networks {
+		log.Print("setting up network ", network.Name)
+
+		// 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
+		}
+
+		// assign envvars
+		envvars := make([]string, 0, 1+len(network.Interfaces))
+		envvars = append(envvars, "PATH=/bin:/sbin:/usr/bin:/usr/sbin")
+
+		for _, match := range network.Interfaces {
+			envvar := new(strings.Builder)
+			envvar.WriteString(match.Var)
+			envvar.WriteByte('=')
+
+			for i, m := range regexpSelectN(match.N, match.Regexps, ifNames) {
+				if i != 0 {
+					envvar.WriteByte(' ')
+				}
+				envvar.WriteString(m)
+				assigned[m] = true
+			}
+
+			log.Print("- ", envvar)
+			envvars = append(envvars, envvar.String())
+		}
+
+		cmd := exec.Command("/bin/sh", "-c", network.Script)
+		cmd.Env = envvars
+		cmd.Stdout = stdout
+		cmd.Stderr = stderr
+		if err := cmd.Run(); err != nil {
+			fatal("failed to setup network: ", err)
+		}
+	}
+}