contrib/persistent-https/main.go

   1 // Copyright 2012 Google Inc. All Rights Reserved.
   2 //
   3 // Licensed under the Apache License, Version 2.0 (the "License");
   4 // you may not use this file except in compliance with the License.
   5 // You may obtain a copy of the License at
   6 //
   7 //     http://www.apache.org/licenses/LICENSE-2.0
   8 //
   9 // Unless required by applicable law or agreed to in writing, software
  10 // distributed under the License is distributed on an "AS IS" BASIS,
  11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 // See the License for the specific language governing permissions and
  13 // limitations under the License.
  14
  15 // The git-remote-persistent-https binary speeds up SSL operations by running
  16 // a daemon job that keeps a connection open to a Git server. This ensures the
  17 // git-remote-persistent-https--proxy is running and delegating execution
  18 // to the git-remote-http binary with the http_proxy set to the daemon job.
  19 // A unix socket is used to authenticate the proxy and discover the
  20 // HTTP address. Note, both the client and proxy are included in the same
  21 // binary.
  22 package main
  23
  24 import (
  25         "flag"
  26         "fmt"
  27         "log"
  28         "os"
  29         "strings"
  30         "time"
  31 )
  32
  33 var (
  34         forceProxy = flag.Bool("proxy", false, "Whether to start the binary in proxy mode")
  35         proxyBin   = flag.String("proxy_bin", "git-remote-persistent-https--proxy", "Path to the proxy binary")
  36         printLabel = flag.Bool("print_label", false, "Prints the build label for the binary")
  37
  38         // Variable that should be defined through the -X linker flag.
  39         _BUILD_EMBED_LABEL string
  40 )
  41
  42 const (
  43         defaultMaxIdleDuration    = 24 * time.Hour
  44         defaultPollUpdateInterval = 15 * time.Minute
  45 )
  46
  47 func main() {
  48         flag.Parse()
  49         if *printLabel {
  50                 // Short circuit execution to print the build label
  51                 fmt.Println(buildLabel())
  52                 return
  53         }
  54
  55         var err error
  56         if *forceProxy || strings.HasSuffix(os.Args[0], "--proxy") {
  57                 log.SetPrefix("git-remote-persistent-https--proxy: ")
  58                 proxy := &Proxy{
  59                         BuildLabel:         buildLabel(),
  60                         MaxIdleDuration:    defaultMaxIdleDuration,
  61                         PollUpdateInterval: defaultPollUpdateInterval,
  62                 }
  63                 err = proxy.Run()
  64         } else {
  65                 log.SetPrefix("git-remote-persistent-https: ")
  66                 client := &Client{
  67                         ProxyBin: *proxyBin,
  68                         Args:     flag.Args(),
  69                 }
  70                 err = client.Run()
  71         }
  72         if err != nil {
  73                 log.Fatalln(err)
  74         }
  75 }
  76
  77 func buildLabel() string {
  78         if _BUILD_EMBED_LABEL == "" {
  79                 log.Println(`unlabeled build; build with "make" to label`)
  80         }
  81         return _BUILD_EMBED_LABEL
  82 }