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// Copyright 2012, 2013 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package main
import (
"errors"
"fmt"
"launchpad.net/juju-core/cmd"
"launchpad.net/juju-core/instance"
"launchpad.net/juju-core/juju"
"launchpad.net/juju-core/log"
"launchpad.net/juju-core/state"
"os/exec"
)
// SSHCommand is responsible for launching a ssh shell on a given unit or machine.
type SSHCommand struct {
SSHCommon
}
// SSHCommon provides common methods for SSHCommand and SCPCommand.
type SSHCommon struct {
EnvCommandBase
Target string
Args []string
*juju.Conn
}
const sshDoc = `
Launch an ssh shell on the machine identified by the <service> parameter.
<service> can be either a machine id or a unit name. Any extra parameters
are treated as extra parameters for the ssh command.
`
func (c *SSHCommand) Info() *cmd.Info {
return &cmd.Info{
Name: "ssh",
Args: "<service> [<ssh args>...]",
Purpose: "launch an ssh shell on a given unit or machine",
Doc: sshDoc,
}
}
func (c *SSHCommand) Init(args []string) error {
if len(args) == 0 {
return errors.New("no service name specified")
}
c.Target, c.Args = args[0], args[1:]
return nil
}
// Run resolves c.Target to a machine, to the address of a i
// machine or unit forks ssh passing any arguments provided.
func (c *SSHCommand) Run(ctx *cmd.Context) error {
var err error
c.Conn, err = juju.NewConnFromName(c.EnvName)
if err != nil {
return err
}
defer c.Close()
host, err := c.hostFromTarget(c.Target)
if err != nil {
return err
}
args := []string{"-l", "ubuntu", "-t", "-o", "StrictHostKeyChecking no", "-o", "PasswordAuthentication no", host}
args = append(args, c.Args...)
cmd := exec.Command("ssh", args...)
cmd.Stdin = ctx.Stdin
cmd.Stdout = ctx.Stdout
cmd.Stderr = ctx.Stderr
c.Close()
return cmd.Run()
}
func (c *SSHCommon) hostFromTarget(target string) (string, error) {
// is the target the id of a machine ?
if state.IsMachineId(target) {
log.Infof("looking up address for machine %s...", target)
// TODO(dfc) maybe we should have machine.PublicAddress() ?
return c.machinePublicAddress(target)
}
// maybe the target is a unit ?
if state.IsUnitName(target) {
log.Infof("looking up address for unit %q...", c.Target)
unit, err := c.State.Unit(target)
if err != nil {
return "", err
}
addr, ok := unit.PublicAddress()
if !ok {
return "", fmt.Errorf("unit %q has no public address", unit)
}
return addr, nil
}
return "", fmt.Errorf("unknown unit or machine %q", target)
}
func (c *SSHCommon) machinePublicAddress(id string) (string, error) {
machine, err := c.State.Machine(id)
if err != nil {
return "", err
}
// wait for instance id
w := machine.Watch()
for _ = range w.Changes() {
if instid, err := machine.InstanceId(); err == nil {
w.Stop()
inst, err := c.Environ.Instances([]instance.Id{instid})
if err != nil {
return "", err
}
return inst[0].WaitDNSName()
} else if !state.IsNotProvisionedError(err) {
return "", err
}
}
// oops, watcher closed before we could get an answer
return "", w.Stop()
}
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