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machine_command.go
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machine_command.go
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package docker_helpers
import (
"bufio"
"bytes"
"errors"
"fmt"
"io"
"os"
"os/exec"
"strings"
"sync"
"github.com/Sirupsen/logrus"
)
type machineCommand struct {
lsCmd *exec.Cmd
lsLock sync.Mutex
lsCond *sync.Cond
lsData []byte
lsError error
}
func (m *machineCommand) ls() (data []byte, err error) {
m.lsLock.Lock()
defer m.lsLock.Unlock()
if m.lsCond == nil {
m.lsCond = sync.NewCond(&m.lsLock)
}
if m.lsCmd == nil {
m.lsCmd = exec.Command("docker-machine", "ls", "-q")
m.lsCmd.Env = os.Environ()
go func() {
m.lsData, m.lsError = m.lsCmd.Output()
m.lsCmd = nil
m.lsCond.Broadcast()
}()
}
m.lsCond.Wait()
return m.lsData, m.lsError
}
func (m *machineCommand) Create(driver, name string, opts ...string) error {
args := []string{
"create",
"--driver", driver,
}
for _, opt := range opts {
args = append(args, "--"+opt)
}
args = append(args, name)
cmd := exec.Command("docker-machine", args...)
cmd.Env = os.Environ()
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
logrus.Debugln("Executing", cmd.Path, cmd.Args)
return cmd.Run()
}
func (m *machineCommand) Provision(name string) error {
cmd := exec.Command("docker-machine", "provision", name)
cmd.Env = os.Environ()
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
return cmd.Run()
}
func (m *machineCommand) Remove(name string) error {
cmd := exec.Command("docker-machine", "rm", "-y", name)
cmd.Env = os.Environ()
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
return cmd.Run()
}
func (m *machineCommand) List(nodeFilter string) (machines []string, err error) {
data, err := m.ls()
if err != nil {
return
}
reader := bufio.NewReader(bytes.NewReader(data))
for {
var line string
line, err = reader.ReadString('\n')
if err != nil {
if err == io.EOF {
err = nil
}
return
}
line = strings.TrimSpace(line)
if line == "" {
continue
}
var query string
if n, _ := fmt.Sscanf(line, nodeFilter, &query); n != 1 {
continue
}
machines = append(machines, line)
}
}
func (m *machineCommand) get(args ...string) (out string, err error) {
// Execute docker-machine to fetch IP
cmd := exec.Command("docker-machine", args...)
cmd.Env = os.Environ()
data, err := cmd.Output()
if err != nil {
return
}
// Save the IP
out = strings.TrimSpace(string(data))
if out == "" {
err = fmt.Errorf("failed to get %v", args)
}
return
}
func (m *machineCommand) IP(name string) (string, error) {
return m.get("ip", name)
}
func (m *machineCommand) URL(name string) (string, error) {
return m.get("url", name)
}
func (m *machineCommand) CertPath(name string) (string, error) {
return m.get("inspect", name, "-f", "{{.HostOptions.AuthOptions.StorePath}}")
}
func (m *machineCommand) Status(name string) (string, error) {
return m.get("status", name)
}
func (m *machineCommand) Exist(name string) bool {
cmd := exec.Command("docker-machine", "inspect", name)
cmd.Env = os.Environ()
cmd.Stderr = os.Stderr
return cmd.Run() == nil
}
func (m *machineCommand) CanConnect(name string) bool {
// Execute docker-machine config which actively ask the machine if it is up and online
cmd := exec.Command("docker-machine", "config", name)
cmd.Env = os.Environ()
err := cmd.Run()
if err == nil {
return true
}
return false
}
func (m *machineCommand) Credentials(name string) (dc DockerCredentials, err error) {
if !m.CanConnect(name) {
err = errors.New("Can't connect")
return
}
dc.TLSVerify = true
dc.Host, err = m.URL(name)
if err == nil {
dc.CertPath, err = m.CertPath(name)
}
return
}
func NewMachineCommand() Machine {
return &machineCommand{}
}