internal: clean up build strings

These names are less ambiguous and should be understandable without reading the source code.

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

cmd/hpkg/proc.go

@@ -14,7 +14,7 @@ import (
 	"hakurei.app/message"
 )
 
-var hakureiPath = internal.MustHakureiPath()
+var hakureiPathVal = internal.MustHakureiPath().String()
 
 func mustRunApp(ctx context.Context, msg message.Msg, config *hst.Config, beforeFail func()) {
 	var (
@@ -27,9 +27,9 @@ func mustRunApp(ctx context.Context, msg message.Msg, config *hst.Config, before
 		log.Fatalf("cannot pipe: %v", err)
 	} else {
 		if msg.IsVerbose() {
-			cmd = exec.CommandContext(ctx, hakureiPath.String(), "-v", "app", "3")
+			cmd = exec.CommandContext(ctx, hakureiPathVal, "-v", "app", "3")
 		} else {
-			cmd = exec.CommandContext(ctx, hakureiPath.String(), "app", "3")
+			cmd = exec.CommandContext(ctx, hakureiPathVal, "app", "3")
 		}
 		cmd.Stdin, cmd.Stdout, cmd.Stderr = os.Stdin, os.Stdout, os.Stderr
 		cmd.ExtraFiles = []*os.File{r}

cmd/hsu/main.go

@@ -26,6 +26,11 @@ const (
 	identityMax = 9999
 )
 
+// hakureiPath is the absolute path to Hakurei.
+//
+// This is set by the linker.
+var hakureiPath string
+
 func main() {
 	log.SetFlags(0)
 	log.SetPrefix("hsu: ")
@@ -43,13 +48,18 @@ func main() {
 		log.Fatal("this program must not be started by root")
 	}
 
+	if !path.IsAbs(hakureiPath) {
+		log.Fatal("this program is compiled incorrectly")
+		return
+	}
+
 	var toolPath string
 	pexe := path.Join("/proc", strconv.Itoa(os.Getppid()), "exe")
 	if p, err := os.Readlink(pexe); err != nil {
 		log.Fatalf("cannot read parent executable path: %v", err)
 	} else if strings.HasSuffix(p, " (deleted)") {
 		log.Fatal("hakurei executable has been deleted")
-	} else if p != mustCheckPath(hmain) {
+	} else if p != hakureiPath {
 		log.Fatal("this program must be started by hakurei")
 	} else {
 		toolPath = p

cmd/hsu/package.nix

@@ -19,5 +19,5 @@ buildGoModule {
   ldflags = lib.attrsets.foldlAttrs (
     ldflags: name: value:
     ldflags ++ [ "-X main.${name}=${value}" ]
-  ) [ "-s -w" ] { hmain = "${hakurei}/libexec/hakurei"; };
+  ) [ "-s -w" ] { hakureiPath = "${hakurei}/libexec/hakurei"; };
 }

cmd/hsu/path.go

@@ -1,20 +0,0 @@
-package main
-
-import (
-	"log"
-	"path"
-)
-
-const compPoison = "INVALIDINVALIDINVALIDINVALIDINVALID"
-
-var (
-	hmain = compPoison
-)
-
-func mustCheckPath(p string) string {
-	if p != compPoison && p != "" && path.IsAbs(p) {
-		return p
-	}
-	log.Fatal("this program is compiled incorrectly")
-	return compPoison
-}

dist/release.sh

@@ -10,10 +10,10 @@ cp -rv "dist/comp" "${out}"
 
 go generate ./...
 go build -trimpath -v -o "${out}/bin/" -ldflags "-s -w -buildid= -extldflags '-static'
-  -X hakurei.app/internal.version=${VERSION}
-  -X hakurei.app/internal.hmain=/usr/bin/hakurei
-  -X hakurei.app/internal.hsu=/usr/bin/hsu
-  -X main.hmain=/usr/bin/hakurei" ./...
+  -X hakurei.app/internal.buildVersion=${VERSION}
+  -X hakurei.app/internal.hakureiPath=/usr/bin/hakurei
+  -X hakurei.app/internal.hsuPath=/usr/bin/hsu
+  -X main.hakureiPath=/usr/bin/hakurei" ./...
 
 rm -f "./${out}.tar.gz" && tar -C dist -czf "${out}.tar.gz" "${pname}"
 rm -rf "./${out}"

internal/comp.go

@@ -1,17 +0,0 @@
-package internal
-
-const compPoison = "INVALIDINVALIDINVALIDINVALIDINVALID"
-
-var (
-	version = compPoison
-)
-
-// checkComp validates string value set at compile time.
-func checkComp(s string) (string, bool) { return s, s != compPoison && s != "" }
-
-func Version() string {
-	if v, ok := checkComp(version); ok {
-		return v
-	}
-	return "impure"
-}

internal/path.go

@@ -6,20 +6,20 @@ import (
 	"hakurei.app/container/check"
 )
 
-var (
-	hmain = compPoison
-	hsu   = compPoison
-)
+// Absolute paths to the Hakurei installation.
+//
+// These are set by the linker.
+var hakureiPath, hsuPath string
 
-// MustHakureiPath returns the absolute path to hakurei, configured at compile time.
-func MustHakureiPath() *check.Absolute { return mustCheckPath(log.Fatal, "hakurei", hmain) }
+// MustHakureiPath returns the [check.Absolute] path to hakurei.
+func MustHakureiPath() *check.Absolute { return mustCheckPath(log.Fatal, "hakurei", hakureiPath) }
 
-// MustHsuPath returns the absolute path to hakurei, configured at compile time.
-func MustHsuPath() *check.Absolute { return mustCheckPath(log.Fatal, "hsu", hsu) }
+// MustHsuPath returns the [check.Absolute] to hsu.
+func MustHsuPath() *check.Absolute { return mustCheckPath(log.Fatal, "hsu", hsuPath) }
 
-// mustCheckPath checks a pathname against compPoison, then [container.NewAbs], calling fatal if either step fails.
+// mustCheckPath checks a pathname to not be zero, then [check.NewAbs], calling fatal if either step fails.
 func mustCheckPath(fatal func(v ...any), name, pathname string) *check.Absolute {
-	if pathname != compPoison && pathname != "" {
+	if pathname != "" {
 		if a, err := check.NewAbs(pathname); err != nil {
 			fatal(err.Error())
 			return nil // unreachable

internal/path_test.go

@@ -15,7 +15,6 @@ func TestMustCheckPath(t *testing.T) {
 		pathname  string
 		wantFatal string
 	}{
-		{"poison", compPoison, "invalid test path, this program is compiled incorrectly"},
 		{"zero", "", "invalid test path, this program is compiled incorrectly"},
 		{"not absolute", "\x00", `path "\x00" is not absolute`},
 		{"success", "/proc/nonexistent", ""},

internal/version.go

@@ -0,0 +1,19 @@
+package internal
+
+// FallbackVersion is returned when a version string was not set by the linker.
+const FallbackVersion = "dirty"
+
+// buildVersion is the Hakurei tree's version string at build time.
+//
+// This is set by the linker.
+var buildVersion string
+
+// Version returns the Hakurei tree's version string.
+// It is either the value of the constant [FallbackVersion] or,
+// when possible, a release tag like "v1.0.0".
+func Version() string {
+	if buildVersion != "" {
+		return buildVersion
+	}
+	return FallbackVersion
+}

package.nix

@@ -75,9 +75,9 @@ buildGoModule rec {
         ]
       )
       {
-        version = "v${version}";
-        hmain = "${placeholder "out"}/libexec/hakurei";
-        hsu = "/run/wrappers/bin/hsu";
+        buildVersion = "v${version}";
+        hakureiPath = "${placeholder "out"}/libexec/hakurei";
+        hsuPath = "/run/wrappers/bin/hsu";
       };
 
   # nix build environment does not allow acls