hst/enablement: editor friendly enablement adaptor

Having the bit field value here (in decimal, no less) is unfriendly to text editors. Use a bunch of booleans here to improve ease of use.

Signed-off-by: Ophestra <cat@gensokyo.uk>

cmd/hakurei/command.go

@@ -124,18 +124,20 @@ func buildCommand(out io.Writer) command.Command {
 				config.Data = a
 			}
 
+			var e system.Enablement
 			if wayland {
-				config.Enablements |= system.EWayland
+				e |= system.EWayland
 			}
 			if x11 {
-				config.Enablements |= system.EX11
+				e |= system.EX11
 			}
 			if dBus {
-				config.Enablements |= system.EDBus
+				e |= system.EDBus
 			}
 			if pulse {
-				config.Enablements |= system.EPulse
+				e |= system.EPulse
 			}
+			config.Enablements = hst.NewEnablements(e)
 
 			// parse D-Bus config file from flags if applicable
 			if dBus {

cmd/hakurei/print.go

@@ -78,7 +78,7 @@ func printShowInstance(
 	} else {
 		t.Printf(" Identity:\t%d\n", config.Identity)
 	}
-	t.Printf(" Enablements:\t%s\n", config.Enablements.String())
+	t.Printf(" Enablements:\t%s\n", config.Enablements.Unwrap().String())
 	if len(config.Groups) > 0 {
 		t.Printf(" Groups:\t%s\n", strings.Join(config.Groups, ", "))
 	}

cmd/hakurei/print_test.go

@@ -195,7 +195,11 @@ App
       "--enable-features=UseOzonePlatform",
       "--ozone-platform=wayland"
     ],
-    "enablements": 13,
+    "enablements": {
+      "wayland": true,
+      "dbus": true,
+      "pulse": true
+    },
     "session_bus": {
       "see": null,
       "talk": [
@@ -339,7 +343,11 @@ App
     "--enable-features=UseOzonePlatform",
     "--ozone-platform=wayland"
   ],
-  "enablements": 13,
+  "enablements": {
+    "wayland": true,
+    "dbus": true,
+    "pulse": true
+  },
   "session_bus": {
     "see": null,
     "talk": [
@@ -537,7 +545,11 @@ func Test_printPs(t *testing.T) {
         "--enable-features=UseOzonePlatform",
         "--ozone-platform=wayland"
       ],
-      "enablements": 13,
+      "enablements": {
+        "wayland": true,
+        "dbus": true,
+        "pulse": true
+      },
       "session_bus": {
         "see": null,
         "talk": [

cmd/hpkg/app.go

@@ -8,7 +8,6 @@ import (
 	"hakurei.app/container"
 	"hakurei.app/container/seccomp"
 	"hakurei.app/hst"
-	"hakurei.app/system"
 	"hakurei.app/system/dbus"
 )
 
@@ -41,7 +40,7 @@ type appInfo struct {
 	// passed through to [hst.Config]
 	SessionBus *dbus.Config `json:"session_bus,omitempty"`
 	// passed through to [hst.Config]
-	Enablements system.Enablement `json:"enablements"`
+	Enablements *hst.Enablements `json:"enablements,omitempty"`
 
 	// passed through to [hst.Config]
 	Multiarch bool `json:"multiarch,omitempty"`

hst/config.go

@@ -3,7 +3,6 @@ package hst
 
 import (
 	"hakurei.app/container"
-	"hakurei.app/system"
 	"hakurei.app/system/dbus"
 )
 
@@ -24,7 +23,7 @@ type Config struct {
 	Args []string `json:"args"`
 
 	// system services to make available in the container
-	Enablements system.Enablement `json:"enablements"`
+	Enablements *Enablements `json:"enablements,omitempty"`
 
 	// session D-Bus proxy configuration;
 	// nil makes session bus proxy assume built-in defaults

hst/enablement.go

@@ -0,0 +1,69 @@
+package hst
+
+import (
+	"encoding/json"
+	"syscall"
+
+	"hakurei.app/system"
+)
+
+// NewEnablements returns the address of [system.Enablement] as [Enablements].
+func NewEnablements(e system.Enablement) *Enablements { return (*Enablements)(&e) }
+
+// enablementsJSON is the [json] representation of the [system.Enablement] bit field.
+type enablementsJSON struct {
+	Wayland bool `json:"wayland,omitempty"`
+	X11     bool `json:"x11,omitempty"`
+	DBus    bool `json:"dbus,omitempty"`
+	Pulse   bool `json:"pulse,omitempty"`
+}
+
+// Enablements is the [json] adapter for [system.Enablement].
+type Enablements system.Enablement
+
+// Unwrap returns the underlying [system.Enablement].
+func (e *Enablements) Unwrap() system.Enablement {
+	if e == nil {
+		return 0
+	}
+	return system.Enablement(*e)
+}
+
+func (e *Enablements) MarshalJSON() ([]byte, error) {
+	if e == nil {
+		return nil, syscall.EINVAL
+	}
+	return json.Marshal(&enablementsJSON{
+		Wayland: system.Enablement(*e)&system.EWayland != 0,
+		X11:     system.Enablement(*e)&system.EX11 != 0,
+		DBus:    system.Enablement(*e)&system.EDBus != 0,
+		Pulse:   system.Enablement(*e)&system.EPulse != 0,
+	})
+}
+
+func (e *Enablements) UnmarshalJSON(data []byte) error {
+	if e == nil {
+		return syscall.EINVAL
+	}
+
+	v := new(enablementsJSON)
+	if err := json.Unmarshal(data, &v); err != nil {
+		return err
+	}
+
+	var ve system.Enablement
+	if v.Wayland {
+		ve |= system.EWayland
+	}
+	if v.X11 {
+		ve |= system.EX11
+	}
+	if v.DBus {
+		ve |= system.EDBus
+	}
+	if v.Pulse {
+		ve |= system.EPulse
+	}
+	*e = Enablements(ve)
+	return nil
+}

hst/enablement_test.go

@@ -0,0 +1,108 @@
+package hst_test
+
+import (
+	"encoding/json"
+	"errors"
+	"syscall"
+	"testing"
+
+	"hakurei.app/hst"
+	"hakurei.app/system"
+)
+
+func TestEnablements(t *testing.T) {
+	testCases := []struct {
+		name  string
+		e     *hst.Enablements
+		data  string
+		sData string
+	}{
+		{"nil", nil, "null", `{"value":null,"magic":3236757504}`},
+		{"zero", hst.NewEnablements(0), `{}`, `{"value":{},"magic":3236757504}`},
+		{"wayland", hst.NewEnablements(system.EWayland), `{"wayland":true}`, `{"value":{"wayland":true},"magic":3236757504}`},
+		{"x11", hst.NewEnablements(system.EX11), `{"x11":true}`, `{"value":{"x11":true},"magic":3236757504}`},
+		{"dbus", hst.NewEnablements(system.EDBus), `{"dbus":true}`, `{"value":{"dbus":true},"magic":3236757504}`},
+		{"pulse", hst.NewEnablements(system.EPulse), `{"pulse":true}`, `{"value":{"pulse":true},"magic":3236757504}`},
+		{"all", hst.NewEnablements(system.EWayland | system.EX11 | system.EDBus | system.EPulse), `{"wayland":true,"x11":true,"dbus":true,"pulse":true}`, `{"value":{"wayland":true,"x11":true,"dbus":true,"pulse":true},"magic":3236757504}`},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			t.Run("marshal", func(t *testing.T) {
+				if got, err := json.Marshal(tc.e); err != nil {
+					t.Fatalf("Marshal: error = %v", err)
+				} else if string(got) != tc.data {
+					t.Errorf("Marshal:\n%s, want\n%s", string(got), tc.data)
+				}
+
+				if got, err := json.Marshal(struct {
+					Value *hst.Enablements `json:"value"`
+					Magic int              `json:"magic"`
+				}{tc.e, syscall.MS_MGC_VAL}); err != nil {
+					t.Fatalf("Marshal: error = %v", err)
+				} else if string(got) != tc.sData {
+					t.Errorf("Marshal:\n%s, want\n%s", string(got), tc.sData)
+				}
+			})
+
+			t.Run("unmarshal", func(t *testing.T) {
+				{
+					got := new(hst.Enablements)
+					if err := json.Unmarshal([]byte(tc.data), &got); err != nil {
+						t.Fatalf("Unmarshal: error = %v", err)
+					}
+					if tc.e == nil {
+						if got != nil {
+							t.Errorf("Unmarshal: %v", got)
+						}
+					} else if *got != *tc.e {
+						t.Errorf("Unmarshal: %v, want %v", got, tc.e)
+					}
+				}
+
+				{
+					got := *(new(struct {
+						Value *hst.Enablements `json:"value"`
+						Magic int              `json:"magic"`
+					}))
+					if err := json.Unmarshal([]byte(tc.sData), &got); err != nil {
+						t.Fatalf("Unmarshal: error = %v", err)
+					}
+					if tc.e == nil {
+						if got.Value != nil {
+							t.Errorf("Unmarshal: %v", got)
+						}
+					} else if *got.Value != *tc.e {
+						t.Errorf("Unmarshal: %v, want %v", got.Value, tc.e)
+					}
+				}
+			})
+		})
+	}
+
+	t.Run("unwrap", func(t *testing.T) {
+		t.Run("nil", func(t *testing.T) {
+			if got := (*hst.Enablements)(nil).Unwrap(); got != 0 {
+				t.Errorf("Unwrap: %v", got)
+			}
+		})
+
+		t.Run("val", func(t *testing.T) {
+			if got := hst.NewEnablements(system.EWayland | system.EPulse).Unwrap(); got != system.EWayland|system.EPulse {
+				t.Errorf("Unwrap: %v", got)
+			}
+		})
+	})
+
+	t.Run("passthrough", func(t *testing.T) {
+		if _, err := (*hst.Enablements)(nil).MarshalJSON(); !errors.Is(err, syscall.EINVAL) {
+			t.Errorf("MarshalJSON: error = %v", err)
+		}
+		if err := (*hst.Enablements)(nil).UnmarshalJSON(nil); !errors.Is(err, syscall.EINVAL) {
+			t.Errorf("UnmarshalJSON: error = %v", err)
+		}
+		if err := new(hst.Enablements).UnmarshalJSON([]byte{}); err == nil {
+			t.Errorf("UnmarshalJSON: error = %v", err)
+		}
+	})
+}

hst/template.go

@@ -21,7 +21,7 @@ func Template() *Config {
 			"--ozone-platform=wayland",
 		},
 
-		Enablements: system.EWayland | system.EDBus | system.EPulse,
+		Enablements: NewEnablements(system.EWayland | system.EDBus | system.EPulse),
 
 		SessionBus: &dbus.Config{
 			See: nil,

hst/template_test.go

@@ -18,7 +18,11 @@ func TestTemplate(t *testing.T) {
 		"--enable-features=UseOzonePlatform",
 		"--ozone-platform=wayland"
 	],
-	"enablements": 13,
+	"enablements": {
+		"wayland": true,
+		"dbus": true,
+		"pulse": true
+	},
 	"session_bus": {
 		"see": null,
 		"talk": [

internal/app/app_nixos_linux_test.go

@@ -23,7 +23,7 @@ var testCasesNixos = []sealTestCase{
 		&hst.Config{
 			ID:          "org.chromium.Chromium",
 			Path:        m("/nix/store/yqivzpzzn7z5x0lq9hmbzygh45d8rhqd-chromium-start"),
-			Enablements: system.EWayland | system.EDBus | system.EPulse,
+			Enablements: hst.NewEnablements(system.EWayland | system.EDBus | system.EPulse),
 			Shell:       m("/run/current-system/sw/bin/zsh"),
 
 			Container: &hst.ContainerConfig{

internal/app/app_pd_linux_test.go

@@ -106,7 +106,7 @@ var testCasesPd = []sealTestCase{
 				},
 				Filter: true,
 			},
-			Enablements: system.EWayland | system.EDBus | system.EPulse,
+			Enablements: hst.NewEnablements(system.EWayland | system.EDBus | system.EPulse),
 		},
 		state.ID{
 			0xeb, 0xf0, 0x83, 0xd1,

internal/app/process_linux.go

@@ -64,7 +64,7 @@ func (seal *outcome) Run(rs *RunState) error {
 					// accumulate enablements of remaining launchers
 					for i, s := range states {
 						if s.Config != nil {
-							rt |= s.Config.Enablements
+							rt |= s.Config.Enablements.Unwrap()
 						} else {
 							log.Printf("state entry %d does not contain config", i)
 						}

internal/app/seal_linux.go

@@ -247,7 +247,7 @@ func (seal *outcome) finalise(ctx context.Context, sys sys.State, config *hst.Co
 		}
 
 		// bind GPU stuff
-		if config.Enablements&(system.EX11|system.EWayland) != 0 {
+		if config.Enablements.Unwrap()&(system.EX11|system.EWayland) != 0 {
 			conf.Filesystem = append(conf.Filesystem, hst.FilesystemConfigJSON{FilesystemConfig: &hst.FSBind{Src: container.AbsFHSDev.Append("dri"), Device: true, Optional: true}})
 		}
 		// opportunistically bind kvm
@@ -348,7 +348,7 @@ func (seal *outcome) finalise(ctx context.Context, sys sys.State, config *hst.Co
 		seal.env[term] = t
 	}
 
-	if config.Enablements&system.EWayland != 0 {
+	if config.Enablements.Unwrap()&system.EWayland != 0 {
 		// outer wayland socket (usually `/run/user/%d/wayland-%d`)
 		var socketPath *container.Absolute
 		if name, ok := sys.LookupEnv(wayland.WaylandDisplay); !ok {
@@ -381,7 +381,7 @@ func (seal *outcome) finalise(ctx context.Context, sys sys.State, config *hst.Co
 		}
 	}
 
-	if config.Enablements&system.EX11 != 0 {
+	if config.Enablements.Unwrap()&system.EX11 != 0 {
 		if d, ok := sys.LookupEnv(display); !ok {
 			return hlog.WrapErr(ErrXDisplay,
 				"DISPLAY is not set")
@@ -393,7 +393,7 @@ func (seal *outcome) finalise(ctx context.Context, sys sys.State, config *hst.Co
 		}
 	}
 
-	if config.Enablements&system.EPulse != 0 {
+	if config.Enablements.Unwrap()&system.EPulse != 0 {
 		// PulseAudio runtime directory (usually `/run/user/%d/pulse`)
 		pulseRuntimeDir := share.sc.RuntimePath.Append("pulse")
 		// PulseAudio socket (usually `/run/user/%d/pulse/native`)
@@ -442,7 +442,7 @@ func (seal *outcome) finalise(ctx context.Context, sys sys.State, config *hst.Co
 		}
 	}
 
-	if config.Enablements&system.EDBus != 0 {
+	if config.Enablements.Unwrap()&system.EDBus != 0 {
 		// ensure dbus session bus defaults
 		if config.SessionBus == nil {
 			config.SessionBus = dbus.NewConfig(config.ID, true, true)

nixos.nix

@@ -102,8 +102,7 @@ in
                     };
                   command = if app.command == null then app.name else app.command;
                   script = if app.script == null then ("exec " + command + " $@") else app.script;
-                  enablements = with app.capability; (if wayland then 1 else 0) + (if x11 then 2 else 0) + (if dbus then 4 else 0) + (if pulse then 8 else 0);
+                  isGraphical = if app.gpu != null then app.gpu else app.enablements.wayland || app.enablements.x11;
-                  isGraphical = if app.gpu != null then app.gpu else app.capability.wayland || app.capability.x11;
 
                   conf = {
                     path =
@@ -116,7 +115,7 @@ in
                         app.path;
                     args = if app.args == null then [ "${app.name}-start" ] else app.args;
 
-                    inherit id enablements;
+                    inherit id;
 
                     inherit (dbusConfig) session_bus system_bus;
                     direct_wayland = app.insecureWayland;
@@ -125,7 +124,7 @@ in
                     data = getsubhome fid app.identity;
 
                     inherit (cfg) shell;
-                    inherit (app) identity groups;
+                    inherit (app) identity groups enablements;
 
                     container = {
                       inherit (app)
@@ -226,7 +225,7 @@ in
                 pkg = if app.share != null then app.share else pkgs.${app.name};
                 copy = source: "[ -d '${source}' ] && cp -Lrv '${source}' $out/share || true";
               in
-              optional (app.capability.wayland || app.capability.x11) (
+              optional (app.enablements.wayland || app.enablements.x11) (
                 pkgs.runCommand "${app.name}-share" { } ''
                   mkdir -p $out/share
                   ${copy "${pkg}/share/applications"}

options.nix

@@ -209,9 +209,9 @@ in
                 '';
               };
 
-              capability = {
+              enablements = {
                 wayland = mkOption {
-                  type = bool;
+                  type = nullOr bool;
                   default = true;
                   description = ''
                     Whether to share the Wayland socket.
@@ -219,7 +219,7 @@ in
                 };
 
                 x11 = mkOption {
-                  type = bool;
+                  type = nullOr bool;
                   default = false;
                   description = ''
                     Whether to share the X11 socket and allow connection.
@@ -227,7 +227,7 @@ in
                 };
 
                 dbus = mkOption {
-                  type = bool;
+                  type = nullOr bool;
                   default = true;
                   description = ''
                     Whether to proxy D-Bus.
@@ -235,7 +235,7 @@ in
                 };
 
                 pulse = mkOption {
-                  type = bool;
+                  type = nullOr bool;
                   default = true;
                   description = ''
                     Whether to share the PulseAudio socket and cookie.

test/configuration.nix

@@ -126,7 +126,7 @@
           wayland-utils
         ];
         command = "foot";
-        capability = {
+        enablements = {
           dbus = false;
           pulse = false;
         };
@@ -141,7 +141,7 @@
         share = pkgs.foot;
         packages = [ ];
         command = "foot";
-        capability = {
+        enablements = {
           dbus = false;
           pulse = false;
         };
@@ -154,7 +154,7 @@
         share = pkgs.foot;
         packages = [ pkgs.foot ];
         command = "foot";
-        capability.dbus = false;
+        enablements.dbus = false;
       };
 
       "cat.gensokyo.extern.Alacritty.x11" = {
@@ -171,7 +171,7 @@
           mesa-demos
         ];
         command = "alacritty";
-        capability = {
+        enablements = {
           wayland = false;
           x11 = true;
           dbus = false;
@@ -192,7 +192,7 @@
           wayland-utils
         ];
         command = "foot";
-        capability = {
+        enablements = {
           dbus = false;
           pulse = false;
         };
@@ -204,7 +204,7 @@
         verbose = true;
         share = pkgs.strace;
         command = "strace true";
-        capability = {
+        enablements = {
           wayland = false;
           x11 = false;
           dbus = false;

test/interactive/hakurei.nix

@@ -13,7 +13,7 @@
         share = pkgs.foot;
         packages = [ pkgs.foot ];
         command = "foot";
-        capability = {
+        enablements = {
           dbus = false;
           pulse = false;
         };