feat: bundle: only write git tags for newly packed bundles

gen/bundle/bundle.go

@@ -1,8 +1,8 @@
 package main
 
 import (
-	"fmt"
 	"os"
+	"strconv"
 	"strings"
 	"text/template"
 
@@ -40,38 +40,42 @@ func splitOverride(override string) (string, string) {
 }
 
 func main() {
+	// read metadata from the embedded bundle, includes all info except git tags
 	metadata, err := build.ReadEmbeddedBuiltinActorsMetadata()
 	if err != nil {
 		panic(err)
 	}
 
-	var metadataSpecificVersion []*build.BuiltinActorsMetadata
-	// see ./build/actors/pack.sh
-	// expected args are:
-	// $(GOCC) run ./gen/bundle $(VERSION) $(RELEASE) $(RELEASE_OVERRIDES)
-	// overrides are in the format network_name=override
-
+	// IF args have been provided, extract git tag info from them, otherwise
+	// rely on previously embedded metadata for git tags.
 	if len(os.Args) > 1 {
-		version := os.Args[1]
+		// see ./build/actors/pack.sh
+		// (optional) expected args are:
+		// $(GOCC) run ./gen/bundle $(VERSION) $(RELEASE) $(RELEASE_OVERRIDES)
+		// overrides are in the format network_name=override
+		gitTag := os.Args[2]
+		packedActorsVersion, err := strconv.Atoi(os.Args[1][1:])
+		if err != nil {
+			panic(err)
+		}
+
 		overrides := map[string]string{}
 		for _, override := range os.Args[3:] {
 			k, v := splitOverride(override)
 			overrides[k] = v
 		}
 		for _, m := range metadata {
-			if strings.HasPrefix(version, fmt.Sprintf("v%d", m.Version)) {
-				// correct version
+			if int(m.Version) == packedActorsVersion {
 				override, ok := overrides[m.Network]
 				if ok {
 					m.BundleGitTag = override
 				} else {
-					m.BundleGitTag = os.Args[2]
+					m.BundleGitTag = gitTag
 				}
-				metadataSpecificVersion = append(metadataSpecificVersion, m)
+			} else {
+				m.BundleGitTag = getOldGitTagFromEmbeddedMetadata(m)
 			}
 		}
-		metadata = metadataSpecificVersion
-
 	}
 
 	fi, err := os.Create("./build/builtin_actors_gen.go")
@@ -85,3 +89,14 @@ func main() {
 		panic(err)
 	}
 }
+
+func getOldGitTagFromEmbeddedMetadata(m *build.BuiltinActorsMetadata) string {
+	for _, v := range build.EmbeddedBuiltinActorsMetadata {
+		// if we agree on the manifestCid for the previously embedded metadata, use the previously set tag
+		if m.Version == v.Version && m.Network == v.Network && m.ManifestCid == v.ManifestCid {
+			return m.BundleGitTag
+		}
+	}
+
+	return ""
+}