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>

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
+}