internal/outcome: rename from app

This is less ambiguous, and more accurately describes the purpose of the package.

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

internal/outcome/spx11.go

@@ -0,0 +1,71 @@
+package outcome
+
+import (
+	"encoding/gob"
+	"errors"
+	"fmt"
+	"io/fs"
+	"strconv"
+	"strings"
+
+	"hakurei.app/container/check"
+	"hakurei.app/container/fhs"
+	"hakurei.app/hst"
+	"hakurei.app/system/acl"
+)
+
+var absX11SocketDir = fhs.AbsTmp.Append(".X11-unix")
+
+func init() { gob.Register(new(spX11Op)) }
+
+// spX11Op exports the X11 display server to the container.
+type spX11Op struct {
+	// Value of $DISPLAY, stored during toSystem
+	Display string
+}
+
+func (s *spX11Op) toSystem(state *outcomeStateSys) error {
+	if state.et&hst.EX11 == 0 {
+		return errNotEnabled
+	}
+
+	if d, ok := state.k.lookupEnv("DISPLAY"); !ok {
+		return newWithMessage("DISPLAY is not set")
+	} else {
+		s.Display = d
+	}
+
+	// the socket file at `/tmp/.X11-unix/X%d` is typically owned by the priv user
+	// and not accessible by the target user
+	var socketPath *check.Absolute
+	if len(s.Display) > 1 && s.Display[0] == ':' { // `:%d`
+		if n, err := strconv.Atoi(s.Display[1:]); err == nil && n >= 0 {
+			socketPath = absX11SocketDir.Append("X" + strconv.Itoa(n))
+		}
+	} else if len(s.Display) > 5 && strings.HasPrefix(s.Display, "unix:") { // `unix:%s`
+		if a, err := check.NewAbs(s.Display[5:]); err == nil {
+			socketPath = a
+		}
+	}
+	if socketPath != nil {
+		if _, err := state.k.stat(socketPath.String()); err != nil {
+			if !errors.Is(err, fs.ErrNotExist) {
+				return &hst.AppError{Step: fmt.Sprintf("access X11 socket %q", socketPath), Err: err}
+			}
+		} else {
+			state.sys.UpdatePermType(hst.EX11, socketPath, acl.Read, acl.Write, acl.Execute)
+			if state.Container.Flags&hst.FHostAbstract == 0 {
+				s.Display = "unix:" + socketPath.String()
+			}
+		}
+	}
+
+	state.sys.ChangeHosts("#" + state.uid.String())
+	return nil
+}
+
+func (s *spX11Op) toContainer(state *outcomeStateParams) error {
+	state.env["DISPLAY"] = s.Display
+	state.params.Bind(absX11SocketDir, absX11SocketDir, 0)
+	return nil
+}