resolver: set buildkit own user-agent

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

client/llb/imagemetaresolver/resolver.go

@@ -11,6 +11,7 @@ import (
 	"github.com/moby/buildkit/client/llb"
 	"github.com/moby/buildkit/util/contentutil"
 	"github.com/moby/buildkit/util/imageutil"
+	"github.com/moby/buildkit/version"
 	"github.com/moby/locker"
 	digest "github.com/opencontainers/go-digest"
 	ocispecs "github.com/opencontainers/image-spec/specs-go/v1"
@@ -40,9 +41,12 @@ func New(with ...ImageMetaResolverOpt) llb.ImageMetaResolver {
 	for _, f := range with {
 		f(&opts)
 	}
+	headers := http.Header{}
+	headers.Set("User-Agent", version.UserAgent())
 	return &imageMetaResolver{
 		resolver: docker.NewResolver(docker.ResolverOptions{
-			Client: http.DefaultClient,
+			Client:  http.DefaultClient,
+			Headers: headers,
 		}),
 		platform: opts.platform,
 		buffer:   contentutil.NewBuffer(),

util/contentutil/refs.go

@@ -9,6 +9,7 @@ import (
 	"github.com/containerd/containerd/errdefs"
 	"github.com/containerd/containerd/remotes"
 	"github.com/containerd/containerd/remotes/docker"
+	"github.com/moby/buildkit/version"
 	"github.com/moby/locker"
 	digest "github.com/opencontainers/go-digest"
 	ocispecs "github.com/opencontainers/image-spec/specs-go/v1"
@@ -16,8 +17,11 @@ import (
 )
 
 func ProviderFromRef(ref string) (ocispecs.Descriptor, content.Provider, error) {
+	headers := http.Header{}
+	headers.Set("User-Agent", version.UserAgent())
 	remote := docker.NewResolver(docker.ResolverOptions{
-		Client: http.DefaultClient,
+		Client:  http.DefaultClient,
+		Headers: headers,
 	})
 
 	name, desc, err := remote.Resolve(context.TODO(), ref)
@@ -33,8 +37,11 @@ func ProviderFromRef(ref string) (ocispecs.Descriptor, content.Provider, error)
 }
 
 func IngesterFromRef(ref string) (content.Ingester, error) {
+	headers := http.Header{}
+	headers.Set("User-Agent", version.UserAgent())
 	remote := docker.NewResolver(docker.ResolverOptions{
-		Client: http.DefaultClient,
+		Client:  http.DefaultClient,
+		Headers: headers,
 	})
 
 	p, err := remote.Pusher(context.TODO(), ref)

util/resolver/authorizer.go

@@ -18,6 +18,7 @@ import (
 	sessionauth "github.com/moby/buildkit/session/auth"
 	log "github.com/moby/buildkit/util/bklog"
 	"github.com/moby/buildkit/util/flightcontrol"
+	"github.com/moby/buildkit/version"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
 )
@@ -355,6 +356,9 @@ func (ah *authHandler) fetchToken(ctx context.Context, sm *session.Manager, g se
 		return nil, nil
 	}
 
+	hdr := http.Header{}
+	hdr.Set("User-Agent", version.UserAgent())
+
 	// fetch token for the resource scope
 	if to.Secret != "" {
 		defer func() {
@@ -370,7 +374,7 @@ func (ah *authHandler) fetchToken(ctx context.Context, sm *session.Manager, g se
 				// As of September 2017, GCR is known to return 404.
 				// As of February 2018, JFrog Artifactory is known to return 401.
 				if (errStatus.StatusCode == 405 && to.Username != "") || errStatus.StatusCode == 404 || errStatus.StatusCode == 401 {
-					resp, err := auth.FetchTokenWithOAuth(ctx, ah.client, nil, "buildkit-client", to)
+					resp, err := auth.FetchTokenWithOAuth(ctx, ah.client, hdr, "buildkit-client", to)
 					if err != nil {
 						return nil, err
 					}
@@ -390,7 +394,7 @@ func (ah *authHandler) fetchToken(ctx context.Context, sm *session.Manager, g se
 		return nil, nil
 	}
 	// do request anonymously
-	resp, err := auth.FetchToken(ctx, ah.client, nil, to)
+	resp, err := auth.FetchToken(ctx, ah.client, hdr, to)
 	if err != nil {
 		return nil, errors.Wrap(err, "failed to fetch anonymous token")
 	}

util/resolver/pool.go

@@ -3,6 +3,7 @@ package resolver
 import (
 	"context"
 	"fmt"
+	"net/http"
 	"strings"
 	"sync"
 	"sync/atomic"
@@ -14,6 +15,7 @@ import (
 	distreference "github.com/docker/distribution/reference"
 	"github.com/moby/buildkit/session"
 	"github.com/moby/buildkit/source"
+	"github.com/moby/buildkit/version"
 	ocispecs "github.com/opencontainers/image-spec/specs-go/v1"
 )
 
@@ -104,8 +106,11 @@ func newResolver(hosts docker.RegistryHosts, handler *authHandlerNS, sm *session
 		g:       g,
 		handler: handler,
 	}
+	headers := http.Header{}
+	headers.Set("User-Agent", version.UserAgent())
 	r.Resolver = docker.NewResolver(docker.ResolverOptions{
-		Hosts: r.HostsFunc,
+		Hosts:   r.HostsFunc,
+		Headers: headers,
 	})
 	return r
 }

version/version.go

@@ -17,14 +17,46 @@
 
 package version
 
+import (
+	"regexp"
+	"sync"
+)
+
+const (
+	defaultVersion = "0.0.0+unknown"
+)
+
 var (
 	// Package is filled at linking time
 	Package = "github.com/moby/buildkit"
 
 	// Version holds the complete version number. Filled in at linking time.
-	Version = "0.0.0+unknown"
+	Version = defaultVersion
 
 	// Revision is filled with the VCS (e.g. git) revision being used to build
 	// the program at linking time.
 	Revision = ""
 )
+
+var (
+	reRelease *regexp.Regexp
+	reDev     *regexp.Regexp
+	reOnce    sync.Once
+)
+
+func UserAgent() string {
+	version := defaultVersion
+
+	reOnce.Do(func() {
+		reRelease = regexp.MustCompile(`^(v[0-9]+\.[0-9]+)\.[0-9]+$`)
+		reDev = regexp.MustCompile(`^(v[0-9]+\.[0-9]+)\.[0-9]+`)
+	})
+
+	if matches := reRelease.FindAllStringSubmatch(version, 1); len(matches) > 0 {
+		version = matches[0][1]
+	} else if matches := reDev.FindAllStringSubmatch(version, 1); len(matches) > 0 {
+		version = matches[0][1] + "-dev"
+	}
+
+	return "buildkit/" + version
+}