add multiple user agents to kaniko if upstream_client_type value is set

pkg/executor/push.go

@@ -21,6 +21,8 @@ import (
 	"fmt"
 	"io/ioutil"
 	"net/http"
+	"os"
+	"strings"
 	"time"
 
 	"github.com/GoogleContainerTools/kaniko/pkg/cache"
@@ -43,8 +45,16 @@ type withUserAgent struct {
 	t http.RoundTripper
 }
 
+const (
+	UPSTREAM_CLIENT_UA_KEY = "UPSTREAM_CLIENT_TYPE"
+)
+
 func (w *withUserAgent) RoundTrip(r *http.Request) (*http.Response, error) {
-	r.Header.Set("User-Agent", fmt.Sprintf("kaniko/%s", version.Version()))
+	ua := []string{fmt.Sprintf("kaniko/%s", version.Version())}
+	if upstream := os.Getenv(UPSTREAM_CLIENT_UA_KEY); upstream != "" {
+		ua = append(ua, upstream)
+	}
+	r.Header.Set("User-Agent", strings.Join(ua, ","))
 	return w.t.RoundTrip(r)
 }
 

pkg/executor/push_test.go

@@ -0,0 +1,71 @@
+/*
+Copyright 2018 Google LLC
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package executor
+
+import (
+	"bytes"
+	"io/ioutil"
+	"net/http"
+	"os"
+	"testing"
+
+	"github.com/GoogleContainerTools/kaniko/testutil"
+)
+
+func TestHeaderAdded(t *testing.T) {
+	tests := []struct {
+		name     string
+		upstream string
+		expected string
+	}{{
+		name:     "upstream env variable set",
+		upstream: "skaffold-v0.25.45",
+		expected: "kaniko/unset,skaffold-v0.25.45",
+	}, {
+		name:     "upstream env variable not set",
+		expected: "kaniko/unset",
+	},
+	}
+	for _, test := range tests {
+
+		t.Run(test.name, func(t *testing.T) {
+			rt := &withUserAgent{t: &mockRoundTripper{}}
+			if test.upstream != "" {
+				os.Setenv("UPSTREAM_CLIENT_TYPE", test.upstream)
+				defer func() { os.Unsetenv("UPSTREAM_CLIENT_TYPE") }()
+			}
+			req, err := http.NewRequest("GET", "dummy", nil)
+			if err != nil {
+				t.Fatalf("culd not create a req due to %s", err)
+			}
+			resp, err := rt.RoundTrip(req)
+			testutil.CheckError(t, false, err)
+			defer resp.Body.Close()
+			body, err := ioutil.ReadAll(resp.Body)
+			testutil.CheckErrorAndDeepEqual(t, false, err, test.expected, string(body))
+		})
+	}
+
+}
+
+type mockRoundTripper struct {
+}
+
+func (m *mockRoundTripper) RoundTrip(r *http.Request) (*http.Response, error) {
+	ua := r.UserAgent()
+	return &http.Response{Body: ioutil.NopCloser(bytes.NewBufferString(ua))}, nil
+}