mirror of
https://github.com/moby/moby.git
synced 2022-11-09 12:21:53 -05:00
739 lines
17 KiB
Go
739 lines
17 KiB
Go
package utils
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import (
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"bytes"
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"crypto/sha256"
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"encoding/hex"
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"encoding/json"
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"errors"
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"fmt"
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"index/suffixarray"
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"io"
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"io/ioutil"
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"log"
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"net/http"
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"os"
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"os/exec"
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"os/user"
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"path/filepath"
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"runtime"
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"strconv"
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"strings"
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"sync"
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"time"
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)
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// Go is a basic promise implementation: it wraps calls a function in a goroutine,
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// and returns a channel which will later return the function's return value.
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func Go(f func() error) chan error {
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ch := make(chan error)
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go func() {
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ch <- f()
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}()
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return ch
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}
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// Request a given URL and return an io.Reader
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func Download(url string, stderr io.Writer) (*http.Response, error) {
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var resp *http.Response
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var err error
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if resp, err = http.Get(url); err != nil {
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return nil, err
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}
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if resp.StatusCode >= 400 {
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return nil, errors.New("Got HTTP status code >= 400: " + resp.Status)
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}
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return resp, nil
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}
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// Debug function, if the debug flag is set, then display. Do nothing otherwise
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// If Docker is in damon mode, also send the debug info on the socket
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func Debugf(format string, a ...interface{}) {
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if os.Getenv("DEBUG") != "" {
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// Retrieve the stack infos
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_, file, line, ok := runtime.Caller(1)
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if !ok {
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file = "<unknown>"
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line = -1
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} else {
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file = file[strings.LastIndex(file, "/")+1:]
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}
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fmt.Fprintf(os.Stderr, fmt.Sprintf("[debug] %s:%d %s\n", file, line, format), a...)
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}
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}
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// Reader with progress bar
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type progressReader struct {
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reader io.ReadCloser // Stream to read from
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output io.Writer // Where to send progress bar to
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readTotal int // Expected stream length (bytes)
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readProgress int // How much has been read so far (bytes)
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lastUpdate int // How many bytes read at least update
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template string // Template to print. Default "%v/%v (%v)"
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sf *StreamFormatter
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}
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func (r *progressReader) Read(p []byte) (n int, err error) {
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read, err := io.ReadCloser(r.reader).Read(p)
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r.readProgress += read
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updateEvery := 1024 * 512 //512kB
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if r.readTotal > 0 {
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// Update progress for every 1% read if 1% < 512kB
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if increment := int(0.01 * float64(r.readTotal)); increment < updateEvery {
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updateEvery = increment
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}
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}
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if r.readProgress-r.lastUpdate > updateEvery || err != nil {
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if r.readTotal > 0 {
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fmt.Fprintf(r.output, r.template, HumanSize(int64(r.readProgress)), HumanSize(int64(r.readTotal)), fmt.Sprintf("%.0f%%", float64(r.readProgress)/float64(r.readTotal)*100))
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} else {
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fmt.Fprintf(r.output, r.template, r.readProgress, "?", "n/a")
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}
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r.lastUpdate = r.readProgress
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}
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// Send newline when complete
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if err != nil {
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r.output.Write(r.sf.FormatStatus(""))
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}
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return read, err
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}
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func (r *progressReader) Close() error {
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return io.ReadCloser(r.reader).Close()
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}
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func ProgressReader(r io.ReadCloser, size int, output io.Writer, template []byte, sf *StreamFormatter) *progressReader {
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tpl := string(template)
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if tpl == "" {
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tpl = string(sf.FormatProgress("", "%8v/%v (%v)"))
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}
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return &progressReader{r, NewWriteFlusher(output), size, 0, 0, tpl, sf}
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}
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// HumanDuration returns a human-readable approximation of a duration
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// (eg. "About a minute", "4 hours ago", etc.)
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func HumanDuration(d time.Duration) string {
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if seconds := int(d.Seconds()); seconds < 1 {
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return "Less than a second"
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} else if seconds < 60 {
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return fmt.Sprintf("%d seconds", seconds)
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} else if minutes := int(d.Minutes()); minutes == 1 {
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return "About a minute"
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} else if minutes < 60 {
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return fmt.Sprintf("%d minutes", minutes)
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} else if hours := int(d.Hours()); hours == 1 {
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return "About an hour"
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} else if hours < 48 {
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return fmt.Sprintf("%d hours", hours)
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} else if hours < 24*7*2 {
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return fmt.Sprintf("%d days", hours/24)
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} else if hours < 24*30*3 {
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return fmt.Sprintf("%d weeks", hours/24/7)
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} else if hours < 24*365*2 {
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return fmt.Sprintf("%d months", hours/24/30)
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}
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return fmt.Sprintf("%f years", d.Hours()/24/365)
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}
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// HumanSize returns a human-readable approximation of a size
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// using SI standard (eg. "44kB", "17MB")
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func HumanSize(size int64) string {
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i := 0
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var sizef float64
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sizef = float64(size)
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units := []string{"B", "kB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB"}
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for sizef >= 1000.0 {
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sizef = sizef / 1000.0
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i++
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}
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return fmt.Sprintf("%.4g %s", sizef, units[i])
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}
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func Trunc(s string, maxlen int) string {
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if len(s) <= maxlen {
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return s
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}
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return s[:maxlen]
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}
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// Figure out the absolute path of our own binary
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func SelfPath() string {
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path, err := exec.LookPath(os.Args[0])
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if err != nil {
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panic(err)
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}
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path, err = filepath.Abs(path)
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if err != nil {
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panic(err)
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}
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return path
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}
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type NopWriter struct{}
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func (*NopWriter) Write(buf []byte) (int, error) {
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return len(buf), nil
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}
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type nopWriteCloser struct {
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io.Writer
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}
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func (w *nopWriteCloser) Close() error { return nil }
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func NopWriteCloser(w io.Writer) io.WriteCloser {
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return &nopWriteCloser{w}
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}
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type bufReader struct {
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sync.Mutex
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buf *bytes.Buffer
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reader io.Reader
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err error
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wait sync.Cond
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}
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func NewBufReader(r io.Reader) *bufReader {
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reader := &bufReader{
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buf: &bytes.Buffer{},
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reader: r,
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}
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reader.wait.L = &reader.Mutex
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go reader.drain()
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return reader
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}
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func (r *bufReader) drain() {
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buf := make([]byte, 1024)
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for {
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n, err := r.reader.Read(buf)
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r.Lock()
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if err != nil {
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r.err = err
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} else {
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r.buf.Write(buf[0:n])
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}
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r.wait.Signal()
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r.Unlock()
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if err != nil {
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break
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}
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}
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}
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func (r *bufReader) Read(p []byte) (n int, err error) {
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r.Lock()
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defer r.Unlock()
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for {
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n, err = r.buf.Read(p)
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if n > 0 {
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return n, err
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}
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if r.err != nil {
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return 0, r.err
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}
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r.wait.Wait()
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}
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}
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func (r *bufReader) Close() error {
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closer, ok := r.reader.(io.ReadCloser)
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if !ok {
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return nil
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}
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return closer.Close()
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}
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type WriteBroadcaster struct {
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sync.Mutex
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writers map[io.WriteCloser]struct{}
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}
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func (w *WriteBroadcaster) AddWriter(writer io.WriteCloser) {
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w.Lock()
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w.writers[writer] = struct{}{}
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w.Unlock()
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}
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// FIXME: Is that function used?
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// FIXME: This relies on the concrete writer type used having equality operator
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func (w *WriteBroadcaster) RemoveWriter(writer io.WriteCloser) {
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w.Lock()
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delete(w.writers, writer)
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w.Unlock()
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}
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func (w *WriteBroadcaster) Write(p []byte) (n int, err error) {
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w.Lock()
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defer w.Unlock()
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for writer := range w.writers {
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if n, err := writer.Write(p); err != nil || n != len(p) {
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// On error, evict the writer
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delete(w.writers, writer)
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}
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}
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return len(p), nil
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}
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func (w *WriteBroadcaster) CloseWriters() error {
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w.Lock()
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defer w.Unlock()
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for writer := range w.writers {
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writer.Close()
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}
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w.writers = make(map[io.WriteCloser]struct{})
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return nil
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}
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func NewWriteBroadcaster() *WriteBroadcaster {
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return &WriteBroadcaster{writers: make(map[io.WriteCloser]struct{})}
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}
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func GetTotalUsedFds() int {
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if fds, err := ioutil.ReadDir(fmt.Sprintf("/proc/%d/fd", os.Getpid())); err != nil {
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Debugf("Error opening /proc/%d/fd: %s", os.Getpid(), err)
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} else {
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return len(fds)
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}
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return -1
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}
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// TruncIndex allows the retrieval of string identifiers by any of their unique prefixes.
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// This is used to retrieve image and container IDs by more convenient shorthand prefixes.
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type TruncIndex struct {
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index *suffixarray.Index
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ids map[string]bool
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bytes []byte
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}
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func NewTruncIndex() *TruncIndex {
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return &TruncIndex{
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index: suffixarray.New([]byte{' '}),
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ids: make(map[string]bool),
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bytes: []byte{' '},
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}
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}
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func (idx *TruncIndex) Add(id string) error {
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if strings.Contains(id, " ") {
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return fmt.Errorf("Illegal character: ' '")
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}
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if _, exists := idx.ids[id]; exists {
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return fmt.Errorf("Id already exists: %s", id)
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}
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idx.ids[id] = true
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idx.bytes = append(idx.bytes, []byte(id+" ")...)
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idx.index = suffixarray.New(idx.bytes)
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return nil
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}
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func (idx *TruncIndex) Delete(id string) error {
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if _, exists := idx.ids[id]; !exists {
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return fmt.Errorf("No such id: %s", id)
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}
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before, after, err := idx.lookup(id)
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if err != nil {
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return err
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}
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delete(idx.ids, id)
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idx.bytes = append(idx.bytes[:before], idx.bytes[after:]...)
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idx.index = suffixarray.New(idx.bytes)
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return nil
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}
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func (idx *TruncIndex) lookup(s string) (int, int, error) {
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offsets := idx.index.Lookup([]byte(" "+s), -1)
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//log.Printf("lookup(%s): %v (index bytes: '%s')\n", s, offsets, idx.index.Bytes())
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if offsets == nil || len(offsets) == 0 || len(offsets) > 1 {
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return -1, -1, fmt.Errorf("No such id: %s", s)
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}
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offsetBefore := offsets[0] + 1
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offsetAfter := offsetBefore + strings.Index(string(idx.bytes[offsetBefore:]), " ")
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return offsetBefore, offsetAfter, nil
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}
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func (idx *TruncIndex) Get(s string) (string, error) {
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before, after, err := idx.lookup(s)
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//log.Printf("Get(%s) bytes=|%s| before=|%d| after=|%d|\n", s, idx.bytes, before, after)
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if err != nil {
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return "", err
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}
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return string(idx.bytes[before:after]), err
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}
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// TruncateID returns a shorthand version of a string identifier for convenience.
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// A collision with other shorthands is very unlikely, but possible.
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// In case of a collision a lookup with TruncIndex.Get() will fail, and the caller
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// will need to use a langer prefix, or the full-length Id.
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func TruncateID(id string) string {
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shortLen := 12
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if len(id) < shortLen {
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shortLen = len(id)
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}
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return id[:shortLen]
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}
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// Code c/c from io.Copy() modified to handle escape sequence
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func CopyEscapable(dst io.Writer, src io.ReadCloser) (written int64, err error) {
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buf := make([]byte, 32*1024)
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for {
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nr, er := src.Read(buf)
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if nr > 0 {
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// ---- Docker addition
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// char 16 is C-p
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if nr == 1 && buf[0] == 16 {
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nr, er = src.Read(buf)
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// char 17 is C-q
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if nr == 1 && buf[0] == 17 {
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if err := src.Close(); err != nil {
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return 0, err
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}
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return 0, io.EOF
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}
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}
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// ---- End of docker
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nw, ew := dst.Write(buf[0:nr])
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if nw > 0 {
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written += int64(nw)
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}
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if ew != nil {
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err = ew
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break
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}
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if nr != nw {
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err = io.ErrShortWrite
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break
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}
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}
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if er == io.EOF {
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break
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}
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if er != nil {
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err = er
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break
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}
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}
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return written, err
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}
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func HashData(src io.Reader) (string, error) {
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h := sha256.New()
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if _, err := io.Copy(h, src); err != nil {
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return "", err
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}
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return "sha256:" + hex.EncodeToString(h.Sum(nil)), nil
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}
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type KernelVersionInfo struct {
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Kernel int
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Major int
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Minor int
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Flavor string
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}
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func (k *KernelVersionInfo) String() string {
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flavor := ""
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if len(k.Flavor) > 0 {
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flavor = fmt.Sprintf("-%s", k.Flavor)
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}
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return fmt.Sprintf("%d.%d.%d%s", k.Kernel, k.Major, k.Minor, flavor)
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}
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|
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// Compare two KernelVersionInfo struct.
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// Returns -1 if a < b, = if a == b, 1 it a > b
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func CompareKernelVersion(a, b *KernelVersionInfo) int {
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if a.Kernel < b.Kernel {
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return -1
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} else if a.Kernel > b.Kernel {
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return 1
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}
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if a.Major < b.Major {
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return -1
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} else if a.Major > b.Major {
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return 1
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}
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|
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if a.Minor < b.Minor {
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return -1
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} else if a.Minor > b.Minor {
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return 1
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}
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return 0
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}
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|
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func FindCgroupMountpoint(cgroupType string) (string, error) {
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output, err := ioutil.ReadFile("/proc/mounts")
|
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if err != nil {
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return "", err
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}
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|
|
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// /proc/mounts has 6 fields per line, one mount per line, e.g.
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// cgroup /sys/fs/cgroup/devices cgroup rw,relatime,devices 0 0
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for _, line := range strings.Split(string(output), "\n") {
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parts := strings.Split(line, " ")
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if len(parts) == 6 && parts[2] == "cgroup" {
|
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for _, opt := range strings.Split(parts[3], ",") {
|
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if opt == cgroupType {
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return parts[1], nil
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}
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}
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}
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}
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|
|
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return "", fmt.Errorf("cgroup mountpoint not found for %s", cgroupType)
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}
|
|
|
|
func GetKernelVersion() (*KernelVersionInfo, error) {
|
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var (
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flavor string
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kernel, major, minor int
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err error
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)
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|
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uts, err := uname()
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if err != nil {
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return nil, err
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|
}
|
|
|
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release := make([]byte, len(uts.Release))
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|
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i := 0
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for _, c := range uts.Release {
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release[i] = byte(c)
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i++
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}
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|
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// Remove the \x00 from the release for Atoi to parse correctly
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release = release[:bytes.IndexByte(release, 0)]
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|
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tmp := strings.SplitN(string(release), "-", 2)
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tmp2 := strings.SplitN(tmp[0], ".", 3)
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|
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if len(tmp2) > 0 {
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kernel, err = strconv.Atoi(tmp2[0])
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if err != nil {
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return nil, err
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}
|
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}
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|
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if len(tmp2) > 1 {
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major, err = strconv.Atoi(tmp2[1])
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if err != nil {
|
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return nil, err
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}
|
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}
|
|
|
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if len(tmp2) > 2 {
|
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// Removes "+" because git kernels might set it
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minorUnparsed := strings.Trim(tmp2[2], "+")
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minor, err = strconv.Atoi(minorUnparsed)
|
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if err != nil {
|
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return nil, err
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}
|
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}
|
|
|
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if len(tmp) == 2 {
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flavor = tmp[1]
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} else {
|
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flavor = ""
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}
|
|
|
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return &KernelVersionInfo{
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Kernel: kernel,
|
|
Major: major,
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Minor: minor,
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Flavor: flavor,
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}, nil
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}
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|
|
|
// FIXME: this is deprecated by CopyWithTar in archive.go
|
|
func CopyDirectory(source, dest string) error {
|
|
if output, err := exec.Command("cp", "-ra", source, dest).CombinedOutput(); err != nil {
|
|
return fmt.Errorf("Error copy: %s (%s)", err, output)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
type NopFlusher struct{}
|
|
|
|
func (f *NopFlusher) Flush() {}
|
|
|
|
type WriteFlusher struct {
|
|
w io.Writer
|
|
flusher http.Flusher
|
|
}
|
|
|
|
func (wf *WriteFlusher) Write(b []byte) (n int, err error) {
|
|
n, err = wf.w.Write(b)
|
|
wf.flusher.Flush()
|
|
return n, err
|
|
}
|
|
|
|
func NewWriteFlusher(w io.Writer) *WriteFlusher {
|
|
var flusher http.Flusher
|
|
if f, ok := w.(http.Flusher); ok {
|
|
flusher = f
|
|
} else {
|
|
flusher = &NopFlusher{}
|
|
}
|
|
return &WriteFlusher{w: w, flusher: flusher}
|
|
}
|
|
|
|
type JSONMessage struct {
|
|
Status string `json:"status,omitempty"`
|
|
Progress string `json:"progress,omitempty"`
|
|
Error string `json:"error,omitempty"`
|
|
}
|
|
|
|
type StreamFormatter struct {
|
|
json bool
|
|
used bool
|
|
}
|
|
|
|
func NewStreamFormatter(json bool) *StreamFormatter {
|
|
return &StreamFormatter{json, false}
|
|
}
|
|
|
|
func (sf *StreamFormatter) FormatStatus(format string, a ...interface{}) []byte {
|
|
sf.used = true
|
|
str := fmt.Sprintf(format, a...)
|
|
if sf.json {
|
|
b, err := json.Marshal(&JSONMessage{Status: str})
|
|
if err != nil {
|
|
return sf.FormatError(err)
|
|
}
|
|
return b
|
|
}
|
|
return []byte(str + "\r\n")
|
|
}
|
|
|
|
func (sf *StreamFormatter) FormatError(err error) []byte {
|
|
sf.used = true
|
|
if sf.json {
|
|
if b, err := json.Marshal(&JSONMessage{Error: err.Error()}); err == nil {
|
|
return b
|
|
}
|
|
return []byte("{\"error\":\"format error\"}")
|
|
}
|
|
return []byte("Error: " + err.Error() + "\r\n")
|
|
}
|
|
|
|
func (sf *StreamFormatter) FormatProgress(action, str string) []byte {
|
|
sf.used = true
|
|
if sf.json {
|
|
b, err := json.Marshal(&JSONMessage{Status: action, Progress: str})
|
|
if err != nil {
|
|
return nil
|
|
}
|
|
return b
|
|
}
|
|
return []byte(action + " " + str + "\r")
|
|
}
|
|
|
|
func (sf *StreamFormatter) Used() bool {
|
|
return sf.used
|
|
}
|
|
|
|
func IsURL(str string) bool {
|
|
return strings.HasPrefix(str, "http://") || strings.HasPrefix(str, "https://")
|
|
}
|
|
|
|
func IsGIT(str string) bool {
|
|
return strings.HasPrefix(str, "git://") || strings.HasPrefix(str, "github.com/")
|
|
}
|
|
|
|
func CheckLocalDns() bool {
|
|
resolv, err := ioutil.ReadFile("/etc/resolv.conf")
|
|
if err != nil {
|
|
Debugf("Error openning resolv.conf: %s", err)
|
|
return false
|
|
}
|
|
for _, ip := range []string{
|
|
"127.0.0.1",
|
|
"127.0.1.1",
|
|
} {
|
|
if strings.Contains(string(resolv), ip) {
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
func ParseHost(host string, port int, addr string) string {
|
|
if strings.HasPrefix(addr, "unix://") {
|
|
return addr
|
|
}
|
|
if strings.HasPrefix(addr, "tcp://") {
|
|
addr = strings.TrimPrefix(addr, "tcp://")
|
|
}
|
|
if strings.Contains(addr, ":") {
|
|
hostParts := strings.Split(addr, ":")
|
|
if len(hostParts) != 2 {
|
|
log.Fatal("Invalid bind address format.")
|
|
os.Exit(-1)
|
|
}
|
|
if hostParts[0] != "" {
|
|
host = hostParts[0]
|
|
}
|
|
if p, err := strconv.Atoi(hostParts[1]); err == nil {
|
|
port = p
|
|
}
|
|
} else {
|
|
host = addr
|
|
}
|
|
return fmt.Sprintf("tcp://%s:%d", host, port)
|
|
}
|
|
|
|
func GetReleaseVersion() string {
|
|
resp, err := http.Get("http://get.docker.io/latest")
|
|
if err != nil {
|
|
return ""
|
|
}
|
|
defer resp.Body.Close()
|
|
body, err := ioutil.ReadAll(resp.Body)
|
|
if err != nil {
|
|
return ""
|
|
}
|
|
return strings.TrimSpace(string(body))
|
|
}
|
|
|
|
// Get a repos name and returns the right reposName + tag
|
|
// The tag can be confusing because of a port in a repository name.
|
|
// Ex: localhost.localdomain:5000/samalba/hipache:latest
|
|
func ParseRepositoryTag(repos string) (string, string) {
|
|
n := strings.LastIndex(repos, ":")
|
|
if n < 0 {
|
|
return repos, ""
|
|
}
|
|
if tag := repos[n+1:]; !strings.Contains(tag, "/") {
|
|
return repos[:n], tag
|
|
}
|
|
return repos, ""
|
|
}
|
|
|
|
// UserLookup check if the given username or uid is present in /etc/passwd
|
|
// and returns the user struct.
|
|
// If the username is not found, an error is returned.
|
|
func UserLookup(uid string) (*user.User, error) {
|
|
file, err := ioutil.ReadFile("/etc/passwd")
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
for _, line := range strings.Split(string(file), "\n") {
|
|
data := strings.Split(line, ":")
|
|
if len(data) > 5 && (data[0] == uid || data[2] == uid) {
|
|
return &user.User{
|
|
Uid: data[2],
|
|
Gid: data[3],
|
|
Username: data[0],
|
|
Name: data[4],
|
|
HomeDir: data[5],
|
|
}, nil
|
|
}
|
|
}
|
|
return nil, fmt.Errorf("User not found in /etc/passwd")
|
|
}
|