forked from facebookarchive/dockerutil
/
client.go
212 lines (191 loc) · 5.11 KB
/
client.go
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package dockerutil
import (
"bytes"
"crypto/tls"
"crypto/x509"
"encoding/base64"
"encoding/json"
"fmt"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"runtime"
"strings"
"github.com/facebookgo/runcmd"
"github.com/facebookgo/stackerr"
"github.com/samalba/dockerclient"
)
// Boot2Docker returns a DockerClient if possible configured according to
// boot2docker.
func Boot2DockerClient() (*dockerclient.DockerClient, error) {
cmd := exec.Command("boot2docker", "shellinit")
cmd.Env = boot2dockerEnv()
streams, err := runcmd.Run(cmd)
if err != nil {
return nil, stackerr.Wrap(err)
}
var host, tls, certPath string
const (
prefixHost = "export DOCKER_HOST="
prefixTLS = "export DOCKER_TLS_VERIFY="
prefixCertPath = "export DOCKER_CERT_PATH="
)
for _, lineB := range bytes.Split(streams.Stdout().Bytes(), []byte("\n")) {
line := string(bytes.TrimSpace(lineB))
if strings.HasPrefix(line, prefixHost) {
host = line[len(prefixHost):]
continue
}
if strings.HasPrefix(line, prefixTLS) {
tls = line[len(prefixTLS):]
continue
}
if strings.HasPrefix(line, prefixCertPath) {
certPath = line[len(prefixCertPath):]
continue
}
}
if tls == "1" {
return DockerWithTLS(host, certPath)
}
client, err := dockerclient.NewDockerClient(host, nil)
if err != nil {
return nil, stackerr.Wrap(err)
}
return client, nil
}
// DockerWithTLS returns a DockerClient with the certs in the specified
// directory. The names of the certs are the standard names of "cert.pem",
// "key.pem" and "ca.pem".
func DockerWithTLS(url, certPath string) (*dockerclient.DockerClient, error) {
var tlsConfig *tls.Config
clientCert, err := tls.LoadX509KeyPair(
filepath.Join(certPath, "cert.pem"),
filepath.Join(certPath, "key.pem"),
)
if err != nil {
return nil, stackerr.Wrap(err)
}
rootCAs := x509.NewCertPool()
caCert, err := ioutil.ReadFile(filepath.Join(certPath, "ca.pem"))
if err != nil {
return nil, stackerr.Wrap(err)
}
rootCAs.AppendCertsFromPEM(caCert)
tlsConfig = &tls.Config{
Certificates: []tls.Certificate{clientCert},
RootCAs: rootCAs,
}
client, err := dockerclient.NewDockerClient(url, tlsConfig)
if err != nil {
return nil, stackerr.Wrap(err)
}
return client, nil
}
// BestEfforDockerClient creates a docker client from one of:
//
// 1. Environment variables as defined in
// https://docs.docker.com/reference/commandline/cli/. Specifically
// DOCKER_HOST, DOCKER_TLS_VERIFY & DOCKER_CERT_PATH.
//
// 2. bootdocker, if darwin.
//
// 3. /run/docker.sock, if it exists.
//
// 4. /var/run/docker.sock, if it exists.
func BestEffortDockerClient() (*dockerclient.DockerClient, error) {
host := os.Getenv("DOCKER_HOST")
if host == "" {
if runtime.GOOS == "darwin" {
return Boot2DockerClient()
}
socketLocations := []string{"/run/docker.sock", "/var/run/docker.sock"}
for _, l := range socketLocations {
if _, err := os.Stat(l); err == nil {
c, err := dockerclient.NewDockerClient(fmt.Sprintf("unix://%s", l), nil)
if err != nil {
return nil, stackerr.Wrap(err)
}
return c, nil
}
}
return nil, stackerr.New("docker not configured")
}
if os.Getenv("DOCKER_TLS_VERIFY") != "" {
return DockerWithTLS(host, os.Getenv("DOCKER_CERT_PATH"))
}
c, err := dockerclient.NewDockerClient(host, nil)
if err != nil {
return nil, stackerr.Wrap(err)
}
return c, nil
}
// boot2dockerEnv returns a small fixed part of the environment. this ensures we're
// not affected by environment variables when we run boot2docker. for example
// `boot2docker shellinit` wont print environment variables if they're already
// set correctly.
func boot2dockerEnv() []string {
var env []string
for _, l := range os.Environ() {
if boot2dockerIncludeEnv(l) {
env = append(env, l)
}
}
return env
}
var boot2dockerIncludeKeys = []string{
"HOME=",
"LANG=",
"PATH=",
"TMPDIR=",
"USER=",
}
func boot2dockerIncludeEnv(l string) bool {
for _, k := range boot2dockerIncludeKeys {
if strings.HasPrefix(l, k) {
return true
}
}
return false
}
func AuthConfigFromFile(file string) (*dockerclient.AuthConfig, error) {
r, err := os.Open(file)
if err != nil {
return nil, stackerr.Wrap(err)
}
defer r.Close()
raw := make(map[string]map[string]string)
if err := json.NewDecoder(r).Decode(&raw); err != nil {
return nil, stackerr.Wrap(err)
}
inner := raw["https://index.docker.io/v1/"]
var ac dockerclient.AuthConfig
ac.Email = inner["email"]
userPass, err := base64.URLEncoding.DecodeString(inner["auth"])
if err != nil {
return nil, stackerr.Wrap(err)
}
parts := bytes.SplitN(userPass, []byte(":"), 2)
ac.Username = string(parts[0])
ac.Password = string(parts[1])
return &ac, nil
}
func WriteDockerAuthConfig(file string, ac *dockerclient.AuthConfig) error {
f, err := os.Create(file)
if err != nil {
return stackerr.Wrap(err)
}
defer f.Close()
auth := []byte(ac.Username + ":" + ac.Password)
data := map[string]map[string]string{
"https://index.docker.io/v1/": {
"email": ac.Email,
"auth": base64.URLEncoding.EncodeToString(auth),
},
}
if err := json.NewEncoder(f).Encode(data); err != nil {
return stackerr.Wrap(err)
}
return stackerr.Wrap(f.Close())
}