Andrew's git - gitweb.git/blob - 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.
  22package main
  23
  24import (
  25        "flag"
  26        "fmt"
  27        "log"
  28        "os"
  29        "strings"
  30        "time"
  31)
  32
  33var (
  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
  42const (
  43        defaultMaxIdleDuration    = 24 * time.Hour
  44        defaultPollUpdateInterval = 15 * time.Minute
  45)
  46
  47func 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
  77func buildLabel() string {
  78        if _BUILD_EMBED_LABEL == "" {
  79                log.Println(`unlabeled build; build with "make" to label`)
  80        }
  81        return _BUILD_EMBED_LABEL
  82}