Merge pull request cli#1708 from cli/wsl-detection

Fallback browser when `xdg-open` does not exist

pkg/browser/browser.go

@@ -30,7 +30,7 @@ func ForOS(goos, url string) *exec.Cmd {
 		r := strings.NewReplacer("&", "^&")
 		args = append(args, "/c", "start", r.Replace(url))
 	default:
-		exe = "xdg-open"
+		exe = linuxExe()
 		args = append(args, url)
 	}
 
@@ -51,3 +51,19 @@ func FromLauncher(launcher, url string) (*exec.Cmd, error) {
 	cmd.Stderr = os.Stderr
 	return cmd, nil
 }
+
+func linuxExe() string {
+	exe := "xdg-open"
+
+	_, err := lookPath(exe)
+	if err != nil {
+		_, err := lookPath("wslview")
+		if err == nil {
+			exe = "wslview"
+		}
+	}
+
+	return exe
+}
+
+var lookPath = exec.LookPath

pkg/browser/browser_test.go

@@ -1,6 +1,7 @@
 package browser
 
 import (
+	"errors"
 	"reflect"
 	"testing"
 )
@@ -13,6 +14,7 @@ func TestForOS(t *testing.T) {
 	tests := []struct {
 		name string
 		args args
+		exe  string
 		want []string
 	}{
 		{
@@ -29,8 +31,18 @@ func TestForOS(t *testing.T) {
 				goos: "linux",
 				url:  "https://example.com/path?a=1&b=2",
 			},
+			exe:  "xdg-open",
 			want: []string{"xdg-open", "https://example.com/path?a=1&b=2"},
 		},
+		{
+			name: "WSL",
+			args: args{
+				goos: "linux",
+				url:  "https://example.com/path?a=1&b=2",
+			},
+			exe:  "wslview",
+			want: []string{"wslview", "https://example.com/path?a=1&b=2"},
+		},
 		{
 			name: "Windows",
 			args: args{
@@ -41,6 +53,14 @@ func TestForOS(t *testing.T) {
 		},
 	}
 	for _, tt := range tests {
+		lookPath = func(file string) (string, error) {
+			if file == tt.exe {
+				return file, nil
+			} else {
+				return "", errors.New("not found")
+			}
+		}
+
 		t.Run(tt.name, func(t *testing.T) {
 			if cmd := ForOS(tt.args.goos, tt.args.url); !reflect.DeepEqual(cmd.Args, tt.want) {
 				t.Errorf("ForOS() = %v, want %v", cmd.Args, tt.want)