internal/wayland: expose WAYLAND_VERSION

This might be useful troubleshooting information.

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

4 files changed, 21 insertions, 6 deletions

diff --git a/cmd/hakurei/print.go b/cmd/hakurei/print.go
index 7e3400a2..7ce51f47 100644
--- a/cmd/hakurei/print.go
+++ b/cmd/hakurei/print.go
@@ -12,8 +12,6 @@ import (
 	"time"
 
 	"hakurei.app/hst"
-	"hakurei.app/internal/env"
-	"hakurei.app/internal/info"
 	"hakurei.app/internal/outcome"
 	"hakurei.app/internal/store"
 	"hakurei.app/message"
@@ -23,16 +21,14 @@ import (
 func printShowSystem(output io.Writer, short, flagJSON bool) {
 	t := newPrinter(output)
 	defer t.MustFlush()
-
-	hi := &hst.Info{Version: info.Version(), User: new(outcome.Hsu).MustID(nil)}
-	env.CopyPaths().Copy(&hi.Paths, hi.User)
+	hi := outcome.Info()
 
 	if flagJSON {
 		encodeJSON(log.Fatal, output, short, hi)
 		return
 	}
 
-	t.Printf("Version:\t%s\n", hi.Version)
+	t.Printf("Version:\t%s (libwayland %s)\n", hi.Version, hi.WaylandVersion)
 	t.Printf("User:\t%d\n", hi.User)
 	t.Printf("TempDir:\t%s\n", hi.TempDir)
 	t.Printf("SharePath:\t%s\n", hi.SharePath)
diff --git a/hst/hst.go b/hst/hst.go
index bdff19f8..f48b9f8d 100644
--- a/hst/hst.go
+++ b/hst/hst.go
@@ -54,6 +54,9 @@ type Paths struct {
 
 // Info holds basic system information collected from the implementation.
 type Info struct {
+	// WaylandVersion is the libwayland value of WAYLAND_VERSION.
+	WaylandVersion string `json:"WAYLAND_VERSION"`
+
 	// Version is a hardcoded version string.
 	Version string `json:"version"`
 	// User is the userid according to hsu.
diff --git a/internal/outcome/outcome.go b/internal/outcome/outcome.go
index 48f85a4b..e2563550 100644
--- a/internal/outcome/outcome.go
+++ b/internal/outcome/outcome.go
@@ -11,10 +11,22 @@ import (
 	"hakurei.app/hst"
 	"hakurei.app/internal/acl"
 	"hakurei.app/internal/env"
+	"hakurei.app/internal/info"
 	"hakurei.app/internal/system"
+	"hakurei.app/internal/wayland"
 	"hakurei.app/message"
 )
 
+// Info returns the address to a populated [hst.Info].
+//
+// This must not be called from within package outcome.
+func Info() *hst.Info {
+	hi := hst.Info{WaylandVersion: wayland.Version,
+		Version: info.Version(), User: new(Hsu).MustID(nil)}
+	env.CopyPaths().Copy(&hi.Paths, hi.User)
+	return &hi
+}
+
 // envAllocSize is the initial size of the env map pre-allocated when the configured env map is nil.
 // It should be large enough to fit all insertions by outcomeOp.toContainer.
 const envAllocSize = 1 << 6
diff --git a/internal/wayland/wayland.go b/internal/wayland/wayland.go
index cc4f4e04..d0ec6cf6 100644
--- a/internal/wayland/wayland.go
+++ b/internal/wayland/wayland.go
@@ -9,6 +9,7 @@ package wayland
 #cgo freebsd openbsd LDFLAGS: -lwayland-client
 
 #include "wayland-client-helper.h"
+#include <wayland-version.h>
 */
 import "C"
 import (
@@ -17,6 +18,9 @@ import (
 )
 
 const (
+	// Version is the value of WAYLAND_VERSION.
+	Version = C.WAYLAND_VERSION
+
 	// Display contains the name of the server socket
 	// (https://gitlab.freedesktop.org/wayland/wayland/-/blob/1.23.1/src/wayland-client.c#L1147)
 	// which is concatenated with XDG_RUNTIME_DIR