mirror of
https://github.com/moby/moby.git
synced 2026-07-12 02:25:19 +00:00
b6f99f6d7f
These comments were added to enforce using the correct import path for
our packages ("github.com/docker/docker", not "github.com/moby/moby").
However, when working in go module mode (not GOPATH / vendor), they have
no effect, so their impact is limited.
Remove these imports in preparation of migrating our code to become an
actual go module.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
64 lines
1.6 KiB
Go
64 lines
1.6 KiB
Go
// Package stringid provides helper functions for dealing with string identifiers
|
|
package stringid
|
|
|
|
import (
|
|
"crypto/rand"
|
|
"encoding/hex"
|
|
"strings"
|
|
)
|
|
|
|
const (
|
|
shortLen = 12
|
|
fullLen = 64
|
|
)
|
|
|
|
// TruncateID returns a shorthand version of a string identifier for convenience.
|
|
// A collision with other shorthands is very unlikely, but possible.
|
|
// In case of a collision a lookup with TruncIndex.Get() will fail, and the caller
|
|
// will need to use a longer prefix, or the full-length Id.
|
|
func TruncateID(id string) string {
|
|
if i := strings.IndexRune(id, ':'); i >= 0 {
|
|
id = id[i+1:]
|
|
}
|
|
if len(id) > shortLen {
|
|
id = id[:shortLen]
|
|
}
|
|
return id
|
|
}
|
|
|
|
// GenerateRandomID returns a unique, 64-character ID consisting of a-z, 0-9.
|
|
// It guarantees that the ID, when truncated ([TruncateID]) does not consist
|
|
// of numbers only, so that the truncated ID can be used as hostname for
|
|
// containers.
|
|
func GenerateRandomID() string {
|
|
b := make([]byte, 32)
|
|
for {
|
|
if _, err := rand.Read(b); err != nil {
|
|
panic(err) // This shouldn't happen
|
|
}
|
|
id := hex.EncodeToString(b)
|
|
|
|
// make sure that the truncated ID does not consist of only numeric
|
|
// characters, as it's used as default hostname for containers.
|
|
//
|
|
// See:
|
|
// - https://github.com/moby/moby/issues/3869
|
|
// - https://bugzilla.redhat.com/show_bug.cgi?id=1059122
|
|
if allNum(id[:shortLen]) {
|
|
// all numbers; try again
|
|
continue
|
|
}
|
|
return id
|
|
}
|
|
}
|
|
|
|
// allNum checks whether id consists of only numbers (0-9).
|
|
func allNum(id string) bool {
|
|
for _, c := range []byte(id) {
|
|
if c > '9' || c < '0' {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|