cmd/dist: include version in release

This makes HAKUREI_VERSION optional during build.

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

cmd/dist/VERSION

@@ -0,0 +1 @@
+v0.4.2

cmd/dist/main.go

@@ -18,8 +18,13 @@ import (
 	"os/signal"
 	"path/filepath"
 	"runtime"
+	"strings"
 )
 
+//go:generate sh -c "git describe --tags > VERSION"
+//go:embed VERSION
+var version string
+
 // getenv looks up an environment variable, and returns fallback if it is unset.
 func getenv(key, fallback string) string {
 	if v, ok := os.LookupEnv(key); ok {
@@ -47,7 +52,7 @@ func main() {
 
 	verbose := os.Getenv("VERBOSE") != ""
 	runTests := os.Getenv("HAKUREI_DIST_MAKE") == ""
-	version := getenv("HAKUREI_VERSION", "untagged")
+	version = getenv("HAKUREI_VERSION", strings.TrimSpace(version))
 	prefix := getenv("PREFIX", "/usr")
 	destdir := getenv("DESTDIR", "dist")
 

flake.nix

@@ -139,7 +139,6 @@
                 GOCACHE="$(mktemp -d)" \
                 PATH="${pkgs.pkgsStatic.musl.bin}/bin:$PATH" \
                 DESTDIR="$out" \
-                HAKUREI_VERSION="v${hakurei.version}" \
                   ./all.sh
               '';
         }