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utils.go
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utils.go
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package drivers
import (
"fmt"
"strings"
"github.com/docker/machine/log"
"github.com/docker/machine/ssh"
"github.com/docker/machine/utils"
)
const (
ErrExitCode255 = "255"
)
func GetSSHClientFromDriver(d Driver) (ssh.Client, error) {
addr, err := d.GetSSHHostname()
if err != nil {
return nil, err
}
port, err := d.GetSSHPort()
if err != nil {
return nil, err
}
auth := &ssh.Auth{
Keys: []string{d.GetSSHKeyPath()},
}
client, err := ssh.NewClient(d.GetSSHUsername(), addr, port, auth)
return client, err
}
func isErr255Exit(err error) bool {
return strings.Contains(err.Error(), ErrExitCode255)
}
func RunSSHCommandFromDriver(d Driver, command string) (string, error) {
client, err := GetSSHClientFromDriver(d)
if err != nil {
return "", err
}
log.Debugf("About to run SSH command:\n%s", command)
output, err := client.Output(command)
log.Debugf("SSH cmd err, output: %v: %s", err, output)
if err != nil && !isErr255Exit(err) {
log.Error("SSH cmd error!")
log.Errorf("command: %s", command)
log.Errorf("err : %v", err)
log.Fatalf("output : %s", output)
}
return output, err
}
func sshAvailableFunc(d Driver) func() bool {
return func() bool {
log.Debug("Getting to WaitForSSH function...")
hostname, err := d.GetSSHHostname()
if err != nil {
log.Debugf("Error getting IP address waiting for SSH: %s", err)
return false
}
port, err := d.GetSSHPort()
if err != nil {
log.Debugf("Error getting SSH port: %s", err)
return false
}
if err := ssh.WaitForTCP(fmt.Sprintf("%s:%d", hostname, port)); err != nil {
log.Debugf("Error waiting for TCP waiting for SSH: %s", err)
return false
}
if _, err := RunSSHCommandFromDriver(d, "exit 0"); err != nil {
log.Debugf("Error getting ssh command 'exit 0' : %s", err)
return false
}
return true
}
}
func WaitForSSH(d Driver) error {
if err := utils.WaitFor(sshAvailableFunc(d)); err != nil {
return fmt.Errorf("Too many retries. Last error: %s", err)
}
return nil
}