store.Inspect: fall back to ssh.config for SSH port

pkg/store/instance.go

@@ -87,6 +87,14 @@ func Inspect(ctx context.Context, instName string) (*limatype.Instance, error) {
 			}
 		}
 	}
+	if inst.SSHLocalPort == 0 {
+		sshConfigPath := filepath.Join(instDir, filenames.SSHConfig)
+		if port, err := sshPortFromConfig(sshConfigPath); err == nil {
+			inst.SSHLocalPort = port
+		} else if !errors.Is(err, os.ErrNotExist) {
+			inst.Errors = append(inst.Errors, fmt.Errorf("failed to extract SSH local port from %q: %w", sshConfigPath, err))
+		}
+	}
 
 	inst.CPUs = *y.CPUs
 	memory, err := units.RAMInBytes(*y.Memory)
@@ -226,6 +234,21 @@ func ReadPIDFile(path string) (int, error) {
 	return pid, nil
 }
 
+// sshPortFromConfig extracts the SSH port from an ssh config file.
+func sshPortFromConfig(configPath string) (int, error) {
+	b, err := os.ReadFile(configPath)
+	if err != nil {
+		return 0, err
+	}
+	for line := range strings.SplitSeq(string(b), "\n") {
+		line = strings.TrimSpace(line)
+		if port, ok := strings.CutPrefix(line, "Port "); ok {
+			return strconv.Atoi(port)
+		}
+	}
+	return 0, fmt.Errorf("port not found in %q", configPath)
+}
+
 type FormatData struct {
 	limatype.Instance `yaml:",inline"`
 

pkg/store/instance_test.go

@@ -66,6 +66,33 @@ var tableTwo = "NAME    STATUS     SSH            VMTYPE    ARCH       CPUS    M
 	"foo     Stopped    127.0.0.1:0    qemu      x86_64     0       0B        0B\n" +
 	"bar     Stopped    127.0.0.1:0    vz        aarch64    0       0B        0B\n"
 
+func TestSSHPortFromConfig(t *testing.T) {
+	t.Run("valid", func(t *testing.T) {
+		f := filepath.Join(t.TempDir(), "ssh.config")
+		content := "Host lima-default\n  Hostname 127.0.0.1\n  Port 58786\n  User foo\n"
+		assert.NilError(t, os.WriteFile(f, []byte(content), 0o644))
+		port, err := sshPortFromConfig(f)
+		assert.NilError(t, err)
+		assert.Equal(t, 58786, port)
+	})
+	t.Run("missing file", func(t *testing.T) {
+		_, err := sshPortFromConfig(filepath.Join(t.TempDir(), "nonexistent"))
+		assert.ErrorIs(t, err, os.ErrNotExist)
+	})
+	t.Run("no port line", func(t *testing.T) {
+		f := filepath.Join(t.TempDir(), "ssh.config")
+		assert.NilError(t, os.WriteFile(f, []byte("Host lima-default\n  Hostname 127.0.0.1\n"), 0o644))
+		_, err := sshPortFromConfig(f)
+		assert.ErrorContains(t, err, "port not found")
+	})
+	t.Run("invalid port", func(t *testing.T) {
+		f := filepath.Join(t.TempDir(), "ssh.config")
+		assert.NilError(t, os.WriteFile(f, []byte("Host lima-default\n  Port abc\n"), 0o644))
+		_, err := sshPortFromConfig(f)
+		assert.ErrorContains(t, err, "invalid syntax")
+	})
+}
+
 func TestPrintInstanceTable(t *testing.T) {
 	var buf bytes.Buffer
 	instances := []*limatype.Instance{&instance}