fix #33

backend/internal/kvm/kvm.go

@@ -1724,12 +1724,12 @@ func ensureDefaultNetwork() error {
 	// Ensure libvirtd is running
 	if err := exec.Command("systemctl", "start", "libvirtd").Run(); err != nil {
 		// Non-systemd systems may use a different init, try virsh connect
-		if exec.Command("virsh", "connect").Run() != nil {
+		if virshCLocaleCommand("connect").Run() != nil {
 			return fmt.Errorf("libvirtd is not running and could not be started")
 		}
 	}
 	// Ensure default network is defined
-	if exec.Command("virsh", "net-info", "default").Run() != nil {
+	if virshCLocaleCommand("net-info", "default").Run() != nil {
 		// Default network may not be defined; try to define it
 		netXML := `<network>
   <name>default</name>
@@ -1746,7 +1746,7 @@ func ensureDefaultNetwork() error {
 			return fmt.Errorf("failed to write default network XML: %v", err)
 		}
 		defer os.Remove(tmpFile)
-		if out, err := exec.Command("virsh", "net-define", tmpFile).CombinedOutput(); err != nil {
+		if out, err := virshCLocaleCommand("net-define", tmpFile).CombinedOutput(); err != nil {
 			return fmt.Errorf("failed to define libvirt default network: %v, output: %s", err, string(out))
 		}
 		if err := os.MkdirAll(filepath.Dir(libvirtDefaultNetworkMarker), 0755); err == nil {
@@ -1754,19 +1754,27 @@ func ensureDefaultNetwork() error {
 		}
 	}
 	// Start and autostart the default network
-	if out, err := exec.Command("virsh", "net-info", "default").Output(); err == nil {
+	if out, err := virshCLocaleCommand("net-info", "default").Output(); err == nil {
 		if !libvirtNetworkActive(string(out)) {
-			if startOut, startErr := exec.Command("virsh", "net-start", "default").CombinedOutput(); startErr != nil {
-				return fmt.Errorf("failed to start libvirt default network: %v, output: %s", startErr, string(startOut))
+			if startOut, startErr := virshCLocaleCommand("net-start", "default").CombinedOutput(); startErr != nil {
+				if verifyOut, verifyErr := virshCLocaleCommand("net-info", "default").Output(); verifyErr != nil || !libvirtNetworkActive(string(verifyOut)) {
+					return fmt.Errorf("failed to start libvirt default network: %v, output: %s", startErr, string(startOut))
+				}
 			}
 		}
 	}
-	if out, err := exec.Command("virsh", "net-autostart", "default").CombinedOutput(); err != nil {
+	if out, err := virshCLocaleCommand("net-autostart", "default").CombinedOutput(); err != nil {
 		return fmt.Errorf("failed to set autostart for libvirt default network: %v, output: %s", err, string(out))
 	}
 	return nil
 }
 
+func virshCLocaleCommand(args ...string) *exec.Cmd {
+	cmd := exec.Command("virsh", args...)
+	cmd.Env = append(os.Environ(), "LC_ALL=C", "LC_MESSAGES=C", "LANG=C", "LANGUAGE=C")
+	return cmd
+}
+
 func libvirtNetworkActive(info string) bool {
 	for _, line := range strings.Split(info, "\n") {
 		key, value, ok := strings.Cut(line, ":")

backend/internal/kvm/kvm_test.go

@@ -24,6 +24,27 @@ func TestImagePathUsesAllowlistedImageID(t *testing.T) {
 	}
 }
 
+func TestLibvirtNetworkActiveParsesCLocaleOutput(t *testing.T) {
+	tests := []struct {
+		name string
+		info string
+		want bool
+	}{
+		{name: "active", info: "Name: default\nActive: yes\n", want: true},
+		{name: "spacing and case", info: "  Active  :  YES  \r\n", want: true},
+		{name: "inactive", info: "Name: default\nActive: no\n", want: false},
+		{name: "missing field", info: "Name: default\nAutostart: yes\n", want: false},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			if got := libvirtNetworkActive(tc.info); got != tc.want {
+				t.Fatalf("libvirtNetworkActive(%q) = %v, want %v", tc.info, got, tc.want)
+			}
+		})
+	}
+}
+
 func TestChpasswdStdinPreservesShellMetacharacters(t *testing.T) {
 	password := `pa'";$(touch /tmp/pwned); echo #\\word`
 	got, err := chpasswdStdin("root", password)