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// Copyright 2019 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
package target
import (
"context"
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"net"
"time"
"fuchsia.googlesource.com/tools/botanist"
"fuchsia.googlesource.com/tools/botanist/power"
"fuchsia.googlesource.com/tools/build"
"fuchsia.googlesource.com/tools/netboot"
"fuchsia.googlesource.com/tools/netutil"
"golang.org/x/crypto/ssh"
)
const (
// The duration we allow for the netstack to come up when booting.
netstackTimeout = 90 * time.Second
)
// DeviceConfig contains the static properties of a target device.
type DeviceConfig struct {
// Network is the network properties of the target.
Network NetworkProperties `json:"network"`
// Power is the attached power management configuration.
Power *power.Client `json:"power,omitempty"`
// SSHKeys are the default system keys to be used with the device.
SSHKeys []string `json:"keys,omitempty"`
// Serial is the path to the device file for serial i/o.
Serial string `json:"serial,omitempty"`
}
// NetworkProperties are the static network properties of a target.
type NetworkProperties struct {
// Nodename is the hostname of the device that we want to boot on.
Nodename string `json:"nodename"`
// IPv4Addr is the IPv4 address, if statically given. If not provided, it may be
// resolved via the netstack's MDNS server.
IPv4Addr string `json:"ipv4"`
}
// LoadDeviceConfigs unmarshalls a slice of device configs from a given file.
func LoadDeviceConfigs(path string) ([]DeviceConfig, error) {
data, err := ioutil.ReadFile(path)
if err != nil {
return nil, fmt.Errorf("failed to read device properties file %q", path)
}
var configs []DeviceConfig
if err := json.Unmarshal(data, &configs); err != nil {
return nil, fmt.Errorf("failed to unmarshal configs: %v", err)
}
return configs, nil
}
// DeviceTarget represents a target device.
type DeviceTarget struct {
config DeviceConfig
opts Options
signers []ssh.Signer
serial *botanist.SerialDevice
}
// NewDeviceTarget returns a new device target with a given configuration.
func NewDeviceTarget(ctx context.Context, config DeviceConfig, opts Options) (*DeviceTarget, error) {
// If an SSH key is specified in the options, prepend it the configs list so that it
// corresponds to the authorized key that would be paved.
if opts.SSHKey != "" {
config.SSHKeys = append([]string{opts.SSHKey}, config.SSHKeys...)
}
signers, err := parseOutSigners(config.SSHKeys)
if err != nil {
return nil, fmt.Errorf("could not parse out signers from private keys: %v", err)
}
var s *botanist.SerialDevice
if config.Serial != "" {
s, err = botanist.NewSerialDevice(ctx, config.Serial)
if err != nil {
return nil, err
}
}
return &DeviceTarget{
config: config,
opts: opts,
signers: signers,
serial: s,
}, nil
}
// Nodename returns the name of the node.
func (t *DeviceTarget) Nodename() string {
return t.config.Network.Nodename
}
// IPv4Addr returns the IPv4 address of the node. If not provided in the config, then it
// will be resolved against the target-side MDNS server.
func (t *DeviceTarget) IPv4Addr() (net.IP, error) {
if t.config.Network.IPv4Addr != "" {
return net.ParseIP(t.config.Network.IPv4Addr), nil
}
return botanist.ResolveIPv4(context.Background(), t.Nodename(), netstackTimeout)
}
// Serial returns the serial device associated with the target for serial i/o.
func (t *DeviceTarget) Serial() *botanist.SerialDevice {
return t.serial
}
// SSHKey returns the private SSH key path associated with the authorized key to be paved.
func (t *DeviceTarget) SSHKey() string {
return t.config.SSHKeys[0]
}
// Start starts the device target.
func (t *DeviceTarget) Start(ctx context.Context, images build.Images, args []string) error {
// Set up log listener and dump kernel output to stdout.
l, err := netboot.NewLogListener(t.Nodename())
if err != nil {
return fmt.Errorf("cannot listen: %v", err)
}
go func() {
defer l.Close()
for {
data, err := l.Listen()
if err != nil {
continue
}
fmt.Print(data)
select {
case <-ctx.Done():
return
default:
}
}
}()
addr, err := netutil.GetNodeAddress(ctx, t.Nodename(), false)
if err != nil {
return err
}
// Boot Fuchsia.
var bootMode int
if t.opts.Netboot {
bootMode = botanist.ModeNetboot
} else {
bootMode = botanist.ModePave
}
return botanist.Boot(ctx, addr, bootMode, images, args, t.signers)
}
// Restart restarts the target.
func (t *DeviceTarget) Restart(ctx context.Context) error {
if t.serial != nil {
defer t.serial.Close()
}
if t.config.Power != nil {
if err := t.config.Power.RebootDevice(t.signers, t.Nodename(), t.serial); err != nil {
return fmt.Errorf("failed to reboot the device: %v", err)
}
}
return nil
}
// Stop stops the device.
func (t *DeviceTarget) Stop(ctx context.Context) error {
return ErrUnimplemented
}
// Wait waits for the device target to stop.
func (t *DeviceTarget) Wait(ctx context.Context) error {
return ErrUnimplemented
}
func parseOutSigners(keyPaths []string) ([]ssh.Signer, error) {
if len(keyPaths) == 0 {
return nil, errors.New("must supply SSH keys in the config")
}
var keys [][]byte
for _, keyPath := range keyPaths {
p, err := ioutil.ReadFile(keyPath)
if err != nil {
return nil, fmt.Errorf("could not read SSH key file %q: %v", keyPath, err)
}
keys = append(keys, p)
}
var signers []ssh.Signer
for _, p := range keys {
signer, err := ssh.ParsePrivateKey(p)
if err != nil {
return nil, err
}
signers = append(signers, signer)
}
return signers, nil
}