Merge pull request #15327 from github/mbg/go/handle-pre-release-versions

mbg · web-flow · commit 6c9f79cc3240 · 2024-01-15T15:24:23.000Z
Go: Better handle pre-release versions
diff --git a/go/extractor/cli/go-autobuilder/go-autobuilder.go b/go/extractor/cli/go-autobuilder/go-autobuilder.go
@@ -96,7 +96,15 @@ func getEnvGoSemVer() string {
 	if !strings.HasPrefix(goVersion, "go") {
 		log.Fatalf("Expected 'go version' output of the form 'go1.2.3'; got '%s'", goVersion)
 	}
-	return "v" + goVersion[2:]
+	// Go versions don't follow the SemVer format, but the only exception we normally care about
+	// is release candidates; so this is a horrible hack to convert e.g. `go1.22rc1` into `go1.22-rc1`
+	// which is compatible with the SemVer specification
+	rcIndex := strings.Index(goVersion, "rc")
+	if rcIndex != -1 {
+		return semver.Canonical("v"+goVersion[2:rcIndex]) + "-" + goVersion[rcIndex:]
+	} else {
+		return semver.Canonical("v" + goVersion[2:])
+	}
 }
 
 // Returns the import path of the package being built, or "" if it cannot be determined.
