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utils.go
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utils.go
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package utils
import (
"crypto/rand"
"encoding/hex"
"encoding/json"
"fmt"
"io"
"net"
"os"
"path/filepath"
"runtime"
"strconv"
"time"
"github.com/docker/machine/log"
)
func GetHomeDir() string {
if runtime.GOOS == "windows" {
return os.Getenv("USERPROFILE")
}
return os.Getenv("HOME")
}
func GetBaseDir() string {
baseDir := os.Getenv("MACHINE_STORAGE_PATH")
if baseDir == "" {
baseDir = filepath.Join(GetHomeDir(), ".docker", "machine")
}
return baseDir
}
func GetDockerDir() string {
return filepath.Join(GetHomeDir(), ".docker")
}
func GetMachineDir() string {
return filepath.Join(GetBaseDir(), "machines")
}
func GetMachineCertDir() string {
return filepath.Join(GetBaseDir(), "certs")
}
func GetMachineCacheDir() string {
return filepath.Join(GetBaseDir(), "cache")
}
func GetUsername() string {
u := "unknown"
osUser := ""
switch runtime.GOOS {
case "darwin", "linux":
osUser = os.Getenv("USER")
case "windows":
osUser = os.Getenv("USERNAME")
}
if osUser != "" {
u = osUser
}
return u
}
func CopyFile(src, dst string) error {
in, err := os.Open(src)
if err != nil {
return err
}
defer in.Close()
out, err := os.Create(dst)
if err != nil {
return err
}
if _, err = io.Copy(out, in); err != nil {
return err
}
fi, err := os.Stat(src)
if err != nil {
return err
}
if err := os.Chmod(dst, fi.Mode()); err != nil {
return err
}
return nil
}
func WaitForSpecific(f func() bool, maxAttempts int, waitInterval time.Duration) error {
for i := 0; i < maxAttempts; i++ {
if f() {
return nil
}
time.Sleep(waitInterval)
}
return fmt.Errorf("Maximum number of retries (%d) exceeded", maxAttempts)
}
func WaitFor(f func() bool) error {
return WaitForSpecific(f, 60, 3*time.Second)
}
func WaitForDocker(ip string, daemonPort int) error {
return WaitFor(func() bool {
conn, err := net.Dial("tcp", fmt.Sprintf("%s:%d", ip, daemonPort))
if err != nil {
log.Debugf("Daemon not responding yet: %s", err)
return false
}
conn.Close()
return true
})
}
func DumpVal(vals ...interface{}) {
for _, val := range vals {
prettyJSON, err := json.MarshalIndent(val, "", " ")
if err != nil {
log.Fatal(err)
}
log.Debug(string(prettyJSON))
}
}
// Following two functions are from github.com/docker/docker/utils module. It
// was way overkill to include the whole module, so we just have these bits
// that we're using here.
func TruncateID(id string) string {
shortLen := 12
if len(id) < shortLen {
shortLen = len(id)
}
return id[:shortLen]
}
// GenerateRandomID returns an unique id
func GenerateRandomID() string {
for {
id := make([]byte, 32)
if _, err := io.ReadFull(rand.Reader, id); err != nil {
panic(err) // This shouldn't happen
}
value := hex.EncodeToString(id)
// if we try to parse the truncated for as an int and we don't have
// an error then the value is all numberic and causes issues when
// used as a hostname. ref #3869
if _, err := strconv.ParseInt(TruncateID(value), 10, 64); err == nil {
continue
}
return value
}
}