protobuf: remove gogoproto

Removes gogo/protobuf from buildx and updates to a version of
moby/buildkit where gogo is removed.

This also changes how the proto files are generated. This is because
newer versions of protobuf are more strict about name conflicts. If two
files have the same name (even if they are relative paths) and are used
in different protoc commands, they'll conflict in the registry.

Since protobuf file generation doesn't work very well with
`paths=source_relative`, this removes the `go:generate` expression and
just relies on the dockerfile to perform the generation.

Signed-off-by: Jonathan A. Sternberg <jonathan.sternberg@docker.com>

vendor/github.com/docker/cli/cli/command/telemetry_docker.go

@@ -5,9 +5,14 @@ package command
 
 import (
 	"context"
+	"fmt"
+	"io/fs"
 	"net/url"
 	"os"
 	"path"
+	"path/filepath"
+	"strings"
+	"unicode"
 
 	"github.com/pkg/errors"
 	"go.opentelemetry.io/otel"
@@ -77,14 +82,7 @@ func dockerExporterOTLPEndpoint(cli Cli) (endpoint string, secure bool) {
 
 	switch u.Scheme {
 	case "unix":
-		// Unix sockets are a bit weird. OTEL seems to imply they
-		// can be used as an environment variable and are handled properly,
-		// but they don't seem to be as the behavior of the environment variable
-		// is to strip the scheme from the endpoint, but the underlying implementation
-		// needs the scheme to use the correct resolver.
-		//
-		// We'll just handle this in a special way and add the unix:// back to the endpoint.
-		endpoint = "unix://" + path.Join(u.Host, u.Path)
+		endpoint = unixSocketEndpoint(u)
 	case "https":
 		secure = true
 		fallthrough
@@ -135,3 +133,109 @@ func dockerMetricExporter(ctx context.Context, cli Cli) []sdkmetric.Option {
 	}
 	return []sdkmetric.Option{sdkmetric.WithReader(newCLIReader(exp))}
 }
+
+// unixSocketEndpoint converts the unix scheme from URL to
+// an OTEL endpoint that can be used with the OTLP exporter.
+//
+// The OTLP exporter handles unix sockets in a strange way.
+// It seems to imply they can be used as an environment variable
+// and are handled properly, but they don't seem to be as the behavior
+// of the environment variable is to strip the scheme from the endpoint
+// while the underlying implementation needs the scheme to use the
+// correct resolver.
+func unixSocketEndpoint(u *url.URL) string {
+	// GRPC does not allow host to be used.
+	socketPath := u.Path
+
+	// If we are on windows and we have an absolute path
+	// that references a letter drive, check to see if the
+	// WSL equivalent path exists and we should use that instead.
+	if isWsl() {
+		if p := wslSocketPath(socketPath, os.DirFS("/")); p != "" {
+			socketPath = p
+		}
+	}
+	// Enforce that we are using forward slashes.
+	return "unix://" + filepath.ToSlash(socketPath)
+}
+
+// wslSocketPath will convert the referenced URL to a WSL-compatible
+// path and check if that path exists. If the path exists, it will
+// be returned.
+func wslSocketPath(s string, f fs.FS) string {
+	if p := toWslPath(s); p != "" {
+		if _, err := stat(p, f); err == nil {
+			return "/" + p
+		}
+	}
+	return ""
+}
+
+// toWslPath converts the referenced URL to a WSL-compatible
+// path if this looks like a Windows absolute path.
+//
+// If no drive is in the URL, defaults to the C drive.
+func toWslPath(s string) string {
+	drive, p, ok := parseUNCPath(s)
+	if !ok {
+		return ""
+	}
+	return fmt.Sprintf("mnt/%s%s", strings.ToLower(drive), p)
+}
+
+func parseUNCPath(s string) (drive, p string, ok bool) {
+	// UNC paths use backslashes but we're using forward slashes
+	// so also enforce that here.
+	//
+	// In reality, this should have been enforced much earlier
+	// than here since backslashes aren't allowed in URLs, but
+	// we're going to code defensively here.
+	s = filepath.ToSlash(s)
+
+	const uncPrefix = "//./"
+	if !strings.HasPrefix(s, uncPrefix) {
+		// Not a UNC path.
+		return "", "", false
+	}
+	s = s[len(uncPrefix):]
+
+	parts := strings.SplitN(s, "/", 2)
+	if len(parts) != 2 {
+		// Not enough components.
+		return "", "", false
+	}
+
+	drive, ok = splitWindowsDrive(parts[0])
+	if !ok {
+		// Not a windows drive.
+		return "", "", false
+	}
+	return drive, "/" + parts[1], true
+}
+
+// splitWindowsDrive checks if the string references a windows
+// drive (such as c:) and returns the drive letter if it is.
+func splitWindowsDrive(s string) (string, bool) {
+	if b := []rune(s); len(b) == 2 && unicode.IsLetter(b[0]) && b[1] == ':' {
+		return string(b[0]), true
+	}
+	return "", false
+}
+
+func stat(p string, f fs.FS) (fs.FileInfo, error) {
+	if f, ok := f.(fs.StatFS); ok {
+		return f.Stat(p)
+	}
+
+	file, err := f.Open(p)
+	if err != nil {
+		return nil, err
+	}
+
+	defer file.Close()
+	return file.Stat()
+}
+
+func isWsl() bool {
+	return os.Getenv("WSL_DISTRO_NAME") != ""
+}

vendor/github.com/docker/cli/cli/command/telemetry_utils.go

@@ -9,6 +9,7 @@ import (
 	"github.com/docker/cli/cli/version"
 	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
+	"go.opentelemetry.io/otel"
 	"go.opentelemetry.io/otel/attribute"
 	"go.opentelemetry.io/otel/metric"
 )
@@ -94,7 +95,9 @@ func startCobraCommandTimer(mp metric.MeterProvider, attrs []attribute.KeyValue)
 			metric.WithAttributes(cmdStatusAttrs...),
 		)
 		if mp, ok := mp.(MeterProvider); ok {
-			mp.ForceFlush(ctx)
+			if err := mp.ForceFlush(ctx); err != nil {
+				otel.Handle(err)
+			}
 		}
 	}
 }