FM / persistent-https

/usr/share/doc/git/contrib/persistent-https/

/usr/share/doc/git/contrib/persistent-https

Name	Size	Mode	Actions
client.go	4937	0644	edit dl rm
LICENSE	11358	0644	edit dl rm
main.go	2424	0644	edit dl rm
Makefile	1500	0644	edit dl rm
proxy.go	4786	0644	edit dl rm
README	1989	0644	edit dl rm
socket.go	2917	0644	edit dl rm

Edit: /usr/share/doc/git/contrib/persistent-https/client.go (4937B)

// Copyright 2012 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 main

import (
	"bufio"
	"errors"
	"fmt"
	"net"
	"net/url"
	"os"
	"os/exec"
	"strings"
	"syscall"
	"time"
)

type Client struct {
	ProxyBin string
	Args     []string

insecure bool
}

func (c *Client) Run() error {
	if err := c.resolveArgs(); err != nil {
		return fmt.Errorf("resolveArgs() got error: %v", err)
	}

// Connect to the proxy.
	uconn, hconn, addr, err := c.connect()
	if err != nil {
		return fmt.Errorf("connect() got error: %v", err)
	}
	// Keep the unix socket connection open for the duration of the request.
	defer uconn.Close()
	// Keep a connection to the HTTP server open, so no other user can
	// bind on the same address so long as the process is running.
	defer hconn.Close()

// Start the git-remote-http subprocess.
	cargs := []string{"-c", fmt.Sprintf("http.proxy=%v", addr), "remote-http"}
	cargs = append(cargs, c.Args...)
	cmd := exec.Command("git", cargs...)

for _, v := range os.Environ() {
		if !strings.HasPrefix(v, "GIT_PERSISTENT_HTTPS_SECURE=") {
			cmd.Env = append(cmd.Env, v)
		}
	}
	// Set the GIT_PERSISTENT_HTTPS_SECURE environment variable when
	// the proxy is using a SSL connection.  This allows credential helpers
	// to identify secure proxy connections, despite being passed an HTTP
	// scheme.
	if !c.insecure {
		cmd.Env = append(cmd.Env, "GIT_PERSISTENT_HTTPS_SECURE=1")
	}

cmd.Stdin = os.Stdin
	cmd.Stdout = os.Stdout
	cmd.Stderr = os.Stderr
	if err := cmd.Run(); err != nil {
		if eerr, ok := err.(*exec.ExitError); ok {
			if stat, ok := eerr.ProcessState.Sys().(syscall.WaitStatus); ok && stat.ExitStatus() != 0 {
				os.Exit(stat.ExitStatus())
			}
		}
		return fmt.Errorf("git-remote-http subprocess got error: %v", err)
	}
	return nil
}

func (c *Client) connect() (uconn net.Conn, hconn net.Conn, addr string, err error) {
	uconn, err = DefaultSocket.Dial()
	if err != nil {
		if e, ok := err.(*net.OpError); ok && (os.IsNotExist(e.Err) || e.Err == syscall.ECONNREFUSED) {
			if err = c.startProxy(); err == nil {
				uconn, err = DefaultSocket.Dial()
			}
		}
		if err != nil {
			return
		}
	}

if addr, err = c.readAddr(uconn); err != nil {
		return
	}

// Open a tcp connection to the proxy.
	if hconn, err = net.Dial("tcp", addr); err != nil {
		return
	}

// Verify the address hasn't changed ownership.
	var addr2 string
	if addr2, err = c.readAddr(uconn); err != nil {
		return
	} else if addr != addr2 {
		err = fmt.Errorf("address changed after connect. got %q, want %q", addr2, addr)
		return
	}
	return
}

func (c *Client) readAddr(conn net.Conn) (string, error) {
	conn.SetDeadline(time.Now().Add(5 * time.Second))
	data := make([]byte, 100)
	n, err := conn.Read(data)
	if err != nil {
		return "", fmt.Errorf("error reading unix socket: %v", err)
	} else if n == 0 {
		return "", errors.New("empty data response")
	}
	conn.Write([]byte{1}) // Ack

var addr string
	if addrs := strings.Split(string(data[:n]), "\n"); len(addrs) != 2 {
		return "", fmt.Errorf("got %q, wanted 2 addresses", data[:n])
	} else if c.insecure {
		addr = addrs[1]
	} else {
		addr = addrs[0]
	}
	return addr, nil
}

func (c *Client) startProxy() error {
	cmd := exec.Command(c.ProxyBin)
	cmd.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
	stdout, err := cmd.StdoutPipe()
	if err != nil {
		return err
	}
	defer stdout.Close()
	if err := cmd.Start(); err != nil {
		return err
	}
	result := make(chan error)
	go func() {
		bytes, _, err := bufio.NewReader(stdout).ReadLine()
		if line := string(bytes); err == nil && line != "OK" {
			err = fmt.Errorf("proxy returned %q, want \"OK\"", line)
		}
		result <- err
	}()
	select {
	case err := <-result:
		return err
	case <-time.After(5 * time.Second):
		return errors.New("timeout waiting for proxy to start")
	}
	panic("not reachable")
}

func (c *Client) resolveArgs() error {
	if nargs := len(c.Args); nargs == 0 {
		return errors.New("remote needed")
	} else if nargs > 2 {
		return fmt.Errorf("want at most 2 args, got %v", c.Args)
	}

// Rewrite the url scheme to be http.
	idx := len(c.Args) - 1
	rawurl := c.Args[idx]
	rurl, err := url.Parse(rawurl)
	if err != nil {
		return fmt.Errorf("invalid remote: %v", err)
	}
	c.insecure = rurl.Scheme == "persistent-http"
	rurl.Scheme = "http"
	c.Args[idx] = rurl.String()
	if idx != 0 && c.Args[0] == rawurl {
		c.Args[0] = c.Args[idx]
	}
	return nil
}

cmd: