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// Copyright 2025 Google Inc. All rights reserved.
//
// 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 build
import (
"bufio"
"errors"
"fmt"
"io"
"log"
"os"
"path/filepath"
"strconv"
"strings"
"sync"
"sync/atomic"
)
const (
cipdProxyPolicyPath = "build/soong/ui/build/cipd_proxy_policy.txtpb"
cipdProxyUrlKey = "CIPD_PROXY_URL"
)
type cipdProxy struct {
cmd *Cmd
wg sync.WaitGroup
stopping atomic.Bool
}
func cipdPath(config Config) string {
return filepath.Join("prebuilts/cipd", config.HostPrebuiltTag(), "cipd")
}
func shouldRunCIPDProxy(config Config) bool {
cipdPath := cipdPath(config)
_, err := os.Stat(cipdPath)
return err == nil
}
func startCIPDProxyServer(ctx Context, config Config) *cipdProxy {
ctx.Status.Status("Starting CIPD proxy server...")
cipdArgs := []string{"proxy", "-proxy-policy", cipdProxyPolicyPath}
adcFlagAdded := false
if config.UseRBE() {
// Determine RBE authentication mechanism and propagate to CIPD flags.
authType, authValue := config.rbeAuth()
switch authType {
case "RBE_credential_file":
cipdArgs = append(cipdArgs, "-service-account-json", authValue)
case "RBE_credentials_helper", "RBE_use_google_prod_creds":
helperPath := filepath.Join(config.rbeDir(), "credshelper")
var credHelperArgsParts []string
// RBE_credentials_helper_args contains space-separated arguments for the helper
// and need to be formatted as repeated 'args:"..."' for the -credential-helper spec.
// e.g. "--f=foo --b=bar" -> 'args:"--f=foo" args:"--b=bar"'.
if rbeArgsStr, ok := config.environ.Get("RBE_credentials_helper_args"); ok && rbeArgsStr != "" {
argList := strings.Fields(rbeArgsStr)
for _, arg := range argList {
credHelperArgsParts = append(credHelperArgsParts, fmt.Sprintf("args:%q", arg))
}
} else {
credHelperArgsParts = append(credHelperArgsParts, fmt.Sprintf("args:%q", "--auth_source=automaticAuth"))
credHelperArgsParts = append(credHelperArgsParts, fmt.Sprintf("args:%q", "--gcert_refresh_timeout=20"))
}
helperSpec := fmt.Sprintf("protocol:RECLIENT exec:'%s' %s", helperPath, strings.Join(credHelperArgsParts, " "))
cipdArgs = append(cipdArgs, "-credential-helper", helperSpec)
case "RBE_use_application_default_credentials", "RBE_use_gce_credentials":
fallthrough
default:
cipdArgs = append(cipdArgs, "-application-default-credentials=always")
adcFlagAdded = true
}
} else {
ctx.Printf("No RBE configuration detected. You may need to use application default credentials.")
}
if !adcFlagAdded {
// RBE instructions for non-corp machines set both RBE_credentials_helper and
// RBE_use_application_default_credentials. Pass that along to CIPD as well.
// Even if USE_RBE=false, CIPD can still use ADC.
if useAdcStr, ok := config.environ.Get("RBE_use_application_default_credentials"); ok {
parsedVal, err := strconv.ParseBool(useAdcStr)
if err == nil && parsedVal {
cipdArgs = append(cipdArgs, "-application-default-credentials=always")
}
}
}
cipdCmd := fmt.Sprintf("cipd %s", strings.Join(cipdArgs, " "))
ctx.Printf("Starting CIPD proxy server with: %s", cipdCmd)
cmd := Command(ctx, config, "cipd", cipdPath(config), cipdArgs...)
stdout, err := cmd.StdoutPipe()
if err != nil {
log.Fatal(err)
}
stderr, err := cmd.StderrPipe()
if err != nil {
log.Fatal(err)
}
if err := cmd.Start(); err != nil {
log.Fatal(err)
}
cp := cipdProxy{cmd: cmd}
cp.wg.Add(1)
go func() {
// Log any error output from cipd until it exits.
defer cp.wg.Done()
bufReader := bufio.NewReader(stderr)
for {
l, err := bufReader.ReadString('\n')
if err != nil {
if errors.Is(err, io.EOF) {
if !cp.stopping.Load() {
err := cmd.Wait()
ctx.Printf("cipd: unexpected EOF, process exited with %v", err)
}
break
}
ctx.Fatalf("cipd: %v %v", l, err)
}
ctx.Printf("cipd: %v", l)
}
}()
bufReader := bufio.NewReader(stdout)
for {
l, err := bufReader.ReadString('\n')
if errors.Is(err, io.EOF) {
ctx.Printf("cipd: unexpected EOF: %v\n", l)
// The stderr goroutine will handle the EOF
cp.wg.Wait()
}
if err != nil {
log.Fatalf("Got %v reading from cipd process", err)
}
if strings.HasPrefix(l, cipdProxyUrlKey) {
proxyUrl := strings.TrimSpace(l[len(cipdProxyUrlKey)+1:])
config.environ.Set(cipdProxyUrlKey, proxyUrl)
ctx.Println("Started CIPD proxy listening on", proxyUrl)
break
}
}
return &cp
}
func (c *cipdProxy) Stop() {
c.stopping.Store(true)
c.cmd.Process.Kill()
c.wg.Wait()
}
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