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util.go
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package main
import (
"encoding/json"
"fmt"
"io"
"log"
"net"
"net/http"
"os"
"os/exec"
"path/filepath"
"regexp"
"strings"
"time"
)
// fmt.Printf to stdout. Convention is to outf info intended for scripting.
func outf(f string, v ...interface{}) {
fmt.Printf(f, v...)
}
// fmt.Printf to stderr. Convention is to errf info intended for human.
func errf(f string, v ...interface{}) {
fmt.Fprintf(os.Stderr, f, v...)
}
// Verbose output for debugging.
func logf(fmt string, v ...interface{}) {
log.Printf(fmt, v...)
}
// Try if addr tcp://addr is readable for n times at wait interval.
func read(addr string, n int, wait time.Duration) error {
var lastErr error
for i := 0; i < n; i++ {
if B2D.Verbose {
logf("Connecting to tcp://%v (attempt #%d)", addr, i)
}
conn, err := net.DialTimeout("tcp", addr, 1*time.Second)
if err != nil {
lastErr = err
time.Sleep(wait)
continue
}
defer conn.Close()
conn.SetDeadline(time.Now().Add(1 * time.Second))
if _, err = conn.Read(make([]byte, 1)); err != nil {
lastErr = err
time.Sleep(wait)
continue
}
return nil
}
return lastErr
}
// Check if an addr can be successfully connected.
func ping(addr string) bool {
conn, err := net.Dial("tcp", addr)
if err != nil {
return false
}
defer conn.Close()
return true
}
// Download the url to the dest path.
func download(dest, url string) error {
rsp, err := http.Get(url)
if err != nil {
return err
}
defer rsp.Body.Close()
// Create the dest dir.
if err := os.MkdirAll(filepath.Dir(dest), 0755); err != nil {
return err
}
f, err := os.Create(fmt.Sprintf("%s.download", dest))
if err != nil {
return err
}
defer os.Remove(f.Name())
if _, err := io.Copy(f, rsp.Body); err != nil {
// TODO: display download progress?
return err
}
if err := f.Close(); err != nil {
return err
}
if _, err := os.Stat(dest); err == nil {
backup_dest := dest + ".bak"
os.Remove(backup_dest)
if err := os.Rename(dest, backup_dest); err != nil {
return err
}
}
if err := os.Rename(f.Name(), dest); err != nil {
return err
}
return nil
}
// Get latest release tag name (e.g. "v0.6.0") from a repo on GitHub.
func getLatestReleaseName(url string) (string, error) {
rsp, err := http.Get(url)
if err != nil {
return "", err
}
defer rsp.Body.Close()
var t []struct {
TagName string `json:"tag_name"`
}
if err := json.NewDecoder(rsp.Body).Decode(&t); err != nil {
return "", err
}
if len(t) == 0 {
return "", fmt.Errorf("no releases found")
}
return t[0].TagName, nil
}
// Convenient function to exec a command.
func cmd(name string, args ...string) (string, error) {
cmd := exec.Command(name, args...)
if B2D.Verbose {
cmd.Stderr = os.Stderr
log.Printf("executing: %v %v", name, strings.Join(args, " "))
}
b, err := cmd.Output()
return string(b), err
}
func cmdInteractive(name string, args ...string) error {
cmd := exec.Command(name, args...)
if B2D.Verbose {
logf("executing: %v %v", name, strings.Join(args, " "))
}
cmd.Stdin = os.Stdin
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
return cmd.Run()
}
//swiped from dotcloud/docker/utils/utils.go
func CopyFile(src, dst string) (int64, error) {
if src == dst {
return 0, nil
}
sf, err := os.Open(src)
if err != nil {
return 0, err
}
defer sf.Close()
if err := os.Remove(dst); err != nil && !os.IsNotExist(err) {
return 0, err
}
df, err := os.Create(dst)
if err != nil {
return 0, err
}
defer df.Close()
return io.Copy(df, sf)
}
func reader(r io.Reader) {
buf := make([]byte, 1024)
for {
_, err := io.ReadAtLeast(r, buf[:], 20)
if err != nil {
return
}
}
}
// use the serial port socket to ask what the VM's host only IP is
func RequestIPFromSerialPort(socket string) string {
c, err := net.Dial("unix", socket)
if err != nil {
return ""
}
defer c.Close()
c.SetDeadline(time.Now().Add(time.Second))
line := ""
_, err = c.Write([]byte("\r"))
_, err = c.Write([]byte("docker\r"))
IP := ""
fullLog := ""
for IP == "" {
_, err := c.Write([]byte("ip addr show dev eth1\r"))
if err != nil {
println(err)
break
}
time.Sleep(1 * time.Second)
buf := make([]byte, 1024)
for {
n, err := c.Read(buf[:])
if err != nil {
return IP
}
line = line + string(buf[0:n])
fullLog += string(buf[0:n])
if strings.Contains(line, "\n") {
//go looking for the string we want, and chomp line to after the \n
if i := strings.IndexAny(line, "\n"); i != -1 {
// inet 10.180.1.3/16 brd 10.180.255.255 scope global wlan0
inet := regexp.MustCompile(`^[\t ]*inet ([0-9.]*).*$`)
if ip := inet.FindStringSubmatch(line[:i]); ip != nil {
IP = ip[1]
// clean up
break
} else {
line = line[i+1:]
}
}
}
}
}
go reader(c)
//give us time reader clean up
time.Sleep(1)
if IP == "" && B2D.Verbose {
logf(fullLog)
}
return IP
}