add better generate

Signed-off-by: Jess Frazelle <acidburn@microsoft.com>

vendor/github.com/docker/docker-ce/components/engine/dockerversion/useragent.go

@@ -0,0 +1,76 @@
+package dockerversion // import "github.com/docker/docker/dockerversion"
+
+import (
+	"fmt"
+	"runtime"
+
+	"github.com/docker/docker/pkg/parsers/kernel"
+	"github.com/docker/docker/pkg/useragent"
+	"golang.org/x/net/context"
+)
+
+// UAStringKey is used as key type for user-agent string in net/context struct
+const UAStringKey = "upstream-user-agent"
+
+// DockerUserAgent is the User-Agent the Docker client uses to identify itself.
+// In accordance with RFC 7231 (5.5.3) is of the form:
+//    [docker client's UA] UpstreamClient([upstream client's UA])
+func DockerUserAgent(ctx context.Context) string {
+	httpVersion := make([]useragent.VersionInfo, 0, 6)
+	httpVersion = append(httpVersion, useragent.VersionInfo{Name: "docker", Version: Version})
+	httpVersion = append(httpVersion, useragent.VersionInfo{Name: "go", Version: runtime.Version()})
+	httpVersion = append(httpVersion, useragent.VersionInfo{Name: "git-commit", Version: GitCommit})
+	if kernelVersion, err := kernel.GetKernelVersion(); err == nil {
+		httpVersion = append(httpVersion, useragent.VersionInfo{Name: "kernel", Version: kernelVersion.String()})
+	}
+	httpVersion = append(httpVersion, useragent.VersionInfo{Name: "os", Version: runtime.GOOS})
+	httpVersion = append(httpVersion, useragent.VersionInfo{Name: "arch", Version: runtime.GOARCH})
+
+	dockerUA := useragent.AppendVersions("", httpVersion...)
+	upstreamUA := getUserAgentFromContext(ctx)
+	if len(upstreamUA) > 0 {
+		ret := insertUpstreamUserAgent(upstreamUA, dockerUA)
+		return ret
+	}
+	return dockerUA
+}
+
+// getUserAgentFromContext returns the previously saved user-agent context stored in ctx, if one exists
+func getUserAgentFromContext(ctx context.Context) string {
+	var upstreamUA string
+	if ctx != nil {
+		var ki interface{} = ctx.Value(UAStringKey)
+		if ki != nil {
+			upstreamUA = ctx.Value(UAStringKey).(string)
+		}
+	}
+	return upstreamUA
+}
+
+// escapeStr returns s with every rune in charsToEscape escaped by a backslash
+func escapeStr(s string, charsToEscape string) string {
+	var ret string
+	for _, currRune := range s {
+		appended := false
+		for _, escapableRune := range charsToEscape {
+			if currRune == escapableRune {
+				ret += `\` + string(currRune)
+				appended = true
+				break
+			}
+		}
+		if !appended {
+			ret += string(currRune)
+		}
+	}
+	return ret
+}
+
+// insertUpstreamUserAgent adds the upstream client useragent to create a user-agent
+// string of the form:
+//   $dockerUA UpstreamClient($upstreamUA)
+func insertUpstreamUserAgent(upstreamUA string, dockerUA string) string {
+	charsToEscape := `();\`
+	upstreamUAEscaped := escapeStr(upstreamUA, charsToEscape)
+	return fmt.Sprintf("%s UpstreamClient(%s)", dockerUA, upstreamUAEscaped)
+}

vendor/github.com/docker/docker-ce/components/engine/dockerversion/version_lib.go

@@ -0,0 +1,17 @@
+// +build !autogen
+
+// Package dockerversion is auto-generated at build-time
+package dockerversion // import "github.com/docker/docker/dockerversion"
+
+// Default build-time variable for library-import.
+// This file is overridden on build with build-time informations.
+const (
+	GitCommit          string = "library-import"
+	Version            string = "library-import"
+	BuildTime          string = "library-import"
+	IAmStatic          string = "library-import"
+	ContainerdCommitID string = "library-import"
+	RuncCommitID       string = "library-import"
+	InitCommitID       string = "library-import"
+	PlatformName       string = ""
+)