Restore DynamicSSHAddress functionality for WSL2

Signed-off-by: Anders F Björklund <anders.f.bjorklund@gmail.com>

Author: afbjorklund

pkg/driver/wsl2/vm_windows.go

@@ -7,6 +7,7 @@ import (
 	"context"
 	_ "embed"
 	"fmt"
+	"net"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -179,6 +180,33 @@ func unregisterVM(ctx context.Context, distroName string) error {
 	return nil
 }
 
+// GetWslStatus runs `wsl --list --verbose` and parses its output.
+// There are several possible outputs, all listed with their whitespace preserved output below.
+//
+// (1) Expected output if at least one distro is installed:
+// PS > wsl --list --verbose
+//
+//	NAME      STATE           VERSION
+//
+// * Ubuntu    Stopped         2
+//
+// (2) Expected output when no distros are installed, but WSL is configured properly:
+// PS > wsl --list --verbose
+// Windows Subsystem for Linux has no installed distributions.
+//
+// Use 'wsl.exe --list --online' to list available distributions
+// and 'wsl.exe --install <Distro>' to install.
+//
+// Distributions can also be installed by visiting the Microsoft Store:
+// https://aka.ms/wslstore
+// Error code: Wsl/WSL_E_DEFAULT_DISTRO_NOT_FOUND
+//
+// (3) Expected output when no distros are installed, and WSL2 has no kernel installed:
+//
+// PS > wsl --list --verbose
+// Windows Subsystem for Linux has no installed distributions.
+// Distributions can be installed by visiting the Microsoft Store:
+// https://aka.ms/wslstore
 func getWslStatus(instName string) (string, error) {
 	distroName := "lima-" + instName
 	out, err := executil.RunUTF16leCommand([]string{
@@ -229,3 +257,34 @@ func getWslStatus(instName string) (string, error) {
 
 	return instState, nil
 }
+
+// GetSSHAddress runs a hostname command to get the IP from inside of a wsl2 VM.
+//
+// Expected output (whitespace preserved, [] for optional):
+// PS > wsl -d <distroName> bash -c hostname -I | cut -d' ' -f1
+// 168.1.1.1 [10.0.0.1]
+// But busybox hostname does not implement --all-ip-addresses:
+// hostname: unrecognized option: I
+func getSSHAddress(ctx context.Context, instName string) (string, error) {
+	distroName := "lima-" + instName
+	// Ubuntu
+	cmd := exec.CommandContext(ctx, "wsl.exe", "-d", distroName, "bash", "-c", `hostname -I | cut -d ' ' -f1`)
+	out, err := cmd.CombinedOutput()
+	if err == nil {
+		return strings.TrimSpace(string(out)), nil
+	}
+	// Alpine
+	cmd = exec.CommandContext(ctx, "wsl.exe", "-d", distroName, "sh", "-c", `ip route get 1 | awk '{gsub("^.*src ",""); print $1; exit}'`)
+	out, err = cmd.CombinedOutput()
+	if err == nil {
+		return strings.TrimSpace(string(out)), nil
+	}
+	// fallback
+	cmd = exec.CommandContext(ctx, "wsl.exe", "-d", distroName, "hostname", "-i")
+	out, err = cmd.CombinedOutput()
+	if err != nil || strings.HasPrefix(string(out), "127.") {
+		return "", fmt.Errorf("failed to get hostname for instance %q, err: %w (out=%q)", instName, err, string(out))
+	}
+
+	return strings.TrimSpace(string(out)), nil
+}

pkg/driver/wsl2/wsl_driver_windows.go

@@ -193,7 +193,7 @@ func (l *LimaWslDriver) InspectStatus(ctx context.Context, inst *limatype.Instan
 	inst.SSHLocalPort = 22
 
 	if inst.Status == limatype.StatusRunning {
-		sshAddr, err := l.SSHAddress(ctx)
+		sshAddr, err := getSSHAddress(ctx, inst.Name)
 		if err == nil {
 			inst.SSHAddress = sshAddr
 		} else {