Use goreleaser to build and release (#244)

Instead of using gox on one side and an action to release, we can merge
them together with goreleaser which will build for extra targets (arm,
mips if needed in the future) and it also takes care of creating
checksums, a source archive, and a changelog and creating a release with
all the artifacts.

All binaries should respect the old naming convention, so any scripts
out there should still work.

Signed-off-by: Itxaka <igarcia@suse.com>

vendor/google.golang.org/protobuf/reflect/protoregistry/registry.go

@@ -17,24 +17,49 @@ package protoregistry
 
 import (
 	"fmt"
-	"log"
+	"os"
 	"strings"
 	"sync"
 
+	"google.golang.org/protobuf/internal/encoding/messageset"
 	"google.golang.org/protobuf/internal/errors"
+	"google.golang.org/protobuf/internal/flags"
 	"google.golang.org/protobuf/reflect/protoreflect"
 )
 
+// conflictPolicy configures the policy for handling registration conflicts.
+//
+// It can be over-written at compile time with a linker-initialized variable:
+//	go build -ldflags "-X google.golang.org/protobuf/reflect/protoregistry.conflictPolicy=warn"
+//
+// It can be over-written at program execution with an environment variable:
+//	GOLANG_PROTOBUF_REGISTRATION_CONFLICT=warn ./main
+//
+// Neither of the above are covered by the compatibility promise and
+// may be removed in a future release of this module.
+var conflictPolicy = "panic" // "panic" | "warn" | "ignore"
+
 // ignoreConflict reports whether to ignore a registration conflict
 // given the descriptor being registered and the error.
 // It is a variable so that the behavior is easily overridden in another file.
 var ignoreConflict = func(d protoreflect.Descriptor, err error) bool {
-	log.Printf(""+
-		"WARNING: %v\n"+
-		"A future release will panic on registration conflicts. See:\n"+
-		"https://developers.google.com/protocol-buffers/docs/reference/go/faq#namespace-conflict\n"+
-		"\n", err)
-	return true
+	const env = "GOLANG_PROTOBUF_REGISTRATION_CONFLICT"
+	const faq = "https://developers.google.com/protocol-buffers/docs/reference/go/faq#namespace-conflict"
+	policy := conflictPolicy
+	if v := os.Getenv(env); v != "" {
+		policy = v
+	}
+	switch policy {
+	case "panic":
+		panic(fmt.Sprintf("%v\nSee %v\n", err, faq))
+	case "warn":
+		fmt.Fprintf(os.Stderr, "WARNING: %v\nSee %v\n\n", err, faq)
+		return true
+	case "ignore":
+		return true
+	default:
+		panic("invalid " + env + " value: " + os.Getenv(env))
+	}
 }
 
 var globalMutex sync.RWMutex
@@ -69,7 +94,8 @@ type Files struct {
 	// Note that enum values are in the top-level since that are in the same
 	// scope as the parent enum.
 	descsByName map[protoreflect.FullName]interface{}
-	filesByPath map[string]protoreflect.FileDescriptor
+	filesByPath map[string][]protoreflect.FileDescriptor
+	numFiles    int
 }
 
 type packageDescriptor struct {
@@ -92,48 +118,16 @@ func (r *Files) RegisterFile(file protoreflect.FileDescriptor) error {
 		r.descsByName = map[protoreflect.FullName]interface{}{
 			"": &packageDescriptor{},
 		}
-		r.filesByPath = make(map[string]protoreflect.FileDescriptor)
+		r.filesByPath = make(map[string][]protoreflect.FileDescriptor)
 	}
 	path := file.Path()
-	if prev := r.filesByPath[path]; prev != nil {
-		// TODO: Remove this after some soak-in period after moving these types.
-		var prevPath string
-		const prevModule = "google.golang.org/genproto"
-		const prevVersion = "cb27e3aa (May 26th, 2020)"
-		switch path {
-		case "google/protobuf/field_mask.proto":
-			prevPath = prevModule + "/protobuf/field_mask"
-		case "google/protobuf/api.proto":
-			prevPath = prevModule + "/protobuf/api"
-		case "google/protobuf/type.proto":
-			prevPath = prevModule + "/protobuf/ptype"
-		case "google/protobuf/source_context.proto":
-			prevPath = prevModule + "/protobuf/source_context"
-		}
-		if r == GlobalFiles && prevPath != "" {
-			pkgName := strings.TrimSuffix(strings.TrimPrefix(path, "google/protobuf/"), ".proto")
-			pkgName = strings.Replace(pkgName, "_", "", -1) + "pb"
-			currPath := "google.golang.org/protobuf/types/known/" + pkgName
-			panic(fmt.Sprintf(""+
-				"duplicate registration of %q\n"+
-				"\n"+
-				"The generated definition for this file has moved:\n"+
-				"\tfrom: %q\n"+
-				"\tto:   %q\n"+
-				"A dependency on the %q module must\n"+
-				"be at version %v or higher.\n"+
-				"\n"+
-				"Upgrade the dependency by running:\n"+
-				"\tgo get -u %v\n",
-				path, prevPath, currPath, prevModule, prevVersion, prevPath))
-		}
-
+	if prev := r.filesByPath[path]; len(prev) > 0 {
+		r.checkGenProtoConflict(path)
 		err := errors.New("file %q is already registered", file.Path())
-		err = amendErrorWithCaller(err, prev, file)
-		if r == GlobalFiles && ignoreConflict(file, err) {
-			err = nil
+		err = amendErrorWithCaller(err, prev[0], file)
+		if !(r == GlobalFiles && ignoreConflict(file, err)) {
+			return err
 		}
-		return err
 	}
 
 	for name := file.Package(); name != ""; name = name.Parent() {
@@ -174,10 +168,52 @@ func (r *Files) RegisterFile(file protoreflect.FileDescriptor) error {
 	rangeTopLevelDescriptors(file, func(d protoreflect.Descriptor) {
 		r.descsByName[d.FullName()] = d
 	})
-	r.filesByPath[path] = file
+	r.filesByPath[path] = append(r.filesByPath[path], file)
+	r.numFiles++
 	return nil
 }
 
+// Several well-known types were hosted in the google.golang.org/genproto module
+// but were later moved to this module. To avoid a weak dependency on the
+// genproto module (and its relatively large set of transitive dependencies),
+// we rely on a registration conflict to determine whether the genproto version
+// is too old (i.e., does not contain aliases to the new type declarations).
+func (r *Files) checkGenProtoConflict(path string) {
+	if r != GlobalFiles {
+		return
+	}
+	var prevPath string
+	const prevModule = "google.golang.org/genproto"
+	const prevVersion = "cb27e3aa (May 26th, 2020)"
+	switch path {
+	case "google/protobuf/field_mask.proto":
+		prevPath = prevModule + "/protobuf/field_mask"
+	case "google/protobuf/api.proto":
+		prevPath = prevModule + "/protobuf/api"
+	case "google/protobuf/type.proto":
+		prevPath = prevModule + "/protobuf/ptype"
+	case "google/protobuf/source_context.proto":
+		prevPath = prevModule + "/protobuf/source_context"
+	default:
+		return
+	}
+	pkgName := strings.TrimSuffix(strings.TrimPrefix(path, "google/protobuf/"), ".proto")
+	pkgName = strings.Replace(pkgName, "_", "", -1) + "pb" // e.g., "field_mask" => "fieldmaskpb"
+	currPath := "google.golang.org/protobuf/types/known/" + pkgName
+	panic(fmt.Sprintf(""+
+		"duplicate registration of %q\n"+
+		"\n"+
+		"The generated definition for this file has moved:\n"+
+		"\tfrom: %q\n"+
+		"\tto:   %q\n"+
+		"A dependency on the %q module must\n"+
+		"be at version %v or higher.\n"+
+		"\n"+
+		"Upgrade the dependency by running:\n"+
+		"\tgo get -u %v\n",
+		path, prevPath, currPath, prevModule, prevVersion, prevPath))
+}
+
 // FindDescriptorByName looks up a descriptor by the full name.
 //
 // This returns (nil, NotFound) if not found.
@@ -273,6 +309,7 @@ func (s *nameSuffix) Pop() (name protoreflect.Name) {
 // FindFileByPath looks up a file by the path.
 //
 // This returns (nil, NotFound) if not found.
+// This returns an error if multiple files have the same path.
 func (r *Files) FindFileByPath(path string) (protoreflect.FileDescriptor, error) {
 	if r == nil {
 		return nil, NotFound
@@ -281,13 +318,19 @@ func (r *Files) FindFileByPath(path string) (protoreflect.FileDescriptor, error)
 		globalMutex.RLock()
 		defer globalMutex.RUnlock()
 	}
-	if fd, ok := r.filesByPath[path]; ok {
-		return fd, nil
+	fds := r.filesByPath[path]
+	switch len(fds) {
+	case 0:
+		return nil, NotFound
+	case 1:
+		return fds[0], nil
+	default:
+		return nil, errors.New("multiple files named %q", path)
 	}
-	return nil, NotFound
 }
 
-// NumFiles reports the number of registered files.
+// NumFiles reports the number of registered files,
+// including duplicate files with the same name.
 func (r *Files) NumFiles() int {
 	if r == nil {
 		return 0
@@ -296,10 +339,11 @@ func (r *Files) NumFiles() int {
 		globalMutex.RLock()
 		defer globalMutex.RUnlock()
 	}
-	return len(r.filesByPath)
+	return r.numFiles
 }
 
 // RangeFiles iterates over all registered files while f returns true.
+// If multiple files have the same name, RangeFiles iterates over all of them.
 // The iteration order is undefined.
 func (r *Files) RangeFiles(f func(protoreflect.FileDescriptor) bool) {
 	if r == nil {
@@ -309,9 +353,11 @@ func (r *Files) RangeFiles(f func(protoreflect.FileDescriptor) bool) {
 		globalMutex.RLock()
 		defer globalMutex.RUnlock()
 	}
-	for _, file := range r.filesByPath {
-		if !f(file) {
-			return
+	for _, files := range r.filesByPath {
+		for _, file := range files {
+			if !f(file) {
+				return
+			}
 		}
 	}
 }
@@ -560,13 +606,25 @@ func (r *Types) FindEnumByName(enum protoreflect.FullName) (protoreflect.EnumTyp
 	return nil, NotFound
 }
 
-// FindMessageByName looks up a message by its full name.
-// E.g., "google.protobuf.Any"
+// FindMessageByName looks up a message by its full name,
+// e.g. "google.protobuf.Any".
 //
-// This return (nil, NotFound) if not found.
+// This returns (nil, NotFound) if not found.
 func (r *Types) FindMessageByName(message protoreflect.FullName) (protoreflect.MessageType, error) {
-	// The full name by itself is a valid URL.
-	return r.FindMessageByURL(string(message))
+	if r == nil {
+		return nil, NotFound
+	}
+	if r == GlobalTypes {
+		globalMutex.RLock()
+		defer globalMutex.RUnlock()
+	}
+	if v := r.typesByName[message]; v != nil {
+		if mt, _ := v.(protoreflect.MessageType); mt != nil {
+			return mt, nil
+		}
+		return nil, errors.New("found wrong type: got %v, want message", typeName(v))
+	}
+	return nil, NotFound
 }
 
 // FindMessageByURL looks up a message by a URL identifier.
@@ -574,6 +632,8 @@ func (r *Types) FindMessageByName(message protoreflect.FullName) (protoreflect.M
 //
 // This returns (nil, NotFound) if not found.
 func (r *Types) FindMessageByURL(url string) (protoreflect.MessageType, error) {
+	// This function is similar to FindMessageByName but
+	// truncates anything before and including '/' in the URL.
 	if r == nil {
 		return nil, NotFound
 	}
@@ -613,6 +673,26 @@ func (r *Types) FindExtensionByName(field protoreflect.FullName) (protoreflect.E
 		if xt, _ := v.(protoreflect.ExtensionType); xt != nil {
 			return xt, nil
 		}
+
+		// MessageSet extensions are special in that the name of the extension
+		// is the name of the message type used to extend the MessageSet.
+		// This naming scheme is used by text and JSON serialization.
+		//
+		// This feature is protected by the ProtoLegacy flag since MessageSets
+		// are a proto1 feature that is long deprecated.
+		if flags.ProtoLegacy {
+			if _, ok := v.(protoreflect.MessageType); ok {
+				field := field.Append(messageset.ExtensionName)
+				if v := r.typesByName[field]; v != nil {
+					if xt, _ := v.(protoreflect.ExtensionType); xt != nil {
+						if messageset.IsMessageSetExtension(xt.TypeDescriptor()) {
+							return xt, nil
+						}
+					}
+				}
+			}
+		}
+
 		return nil, errors.New("found wrong type: got %v, want extension", typeName(v))
 	}
 	return nil, NotFound