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/*
* Copyright (c) 2017-2018 Samsung Electronics Co., Ltd All Rights Reserved
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License
*/
// Package dryad provides:
// * implementation of Dryad interface
// * utilities to manage Dryad and its users
package dryad
import (
"context"
"crypto/rsa"
"fmt"
. "git.tizen.org/tools/boruta"
"git.tizen.org/tools/muxpi/sw/nanopi/stm"
"golang.org/x/crypto/ssh"
)
// Rusalka implements Dryad interface. It is intended to be used on NanoPi connected to MuxPi.
// It is not safe for concurrent use.
type Rusalka struct {
Dryad
dryadUser *borutaUser
stm *stmHelper
cancelMaintenance context.CancelFunc
}
// NewRusalka returns Dryad interface to Rusalka.
func NewRusalka(stmConn stm.Interface, username string, groups []string) Dryad {
return &Rusalka{
dryadUser: newBorutaUser(username, groups),
stm: &stmHelper{stmConn},
}
}
// PutInMaintenance is part of implementation of Dryad interface.
// Connection to STM is being opened only for the maintenance actions.
// Otherwise it may make it unusable for other STM users. It is closed
// when blinkMaintenanceLED exits.
func (r *Rusalka) PutInMaintenance(msg string) error {
err := r.stm.printMessage(msg)
if err != nil {
return err
}
var ctx context.Context
ctx, r.cancelMaintenance = context.WithCancel(context.Background())
go r.stm.blinkMaintenanceLED(ctx)
return nil
}
// Prepare is part of implementation of Dryad interface. Call to Prepare stops LED blinking.
func (r *Rusalka) Prepare(key *rsa.PublicKey) (err error) {
// Stop maintenance.
if r.cancelMaintenance != nil {
r.cancelMaintenance()
r.cancelMaintenance = nil
}
// Remove/Add user.
err = r.dryadUser.delete()
if err != nil {
return fmt.Errorf("user removal failed: %s", err)
}
err = r.dryadUser.add()
if err != nil {
return fmt.Errorf("user creation failed: %s", err)
}
// Verify user's existance.
err = r.dryadUser.update()
if err != nil {
return fmt.Errorf("user information update failed: %s", err)
}
// Prepare SSH access (it can't fail as key is of type rsa.PublicKey).
sshPubKey, _ := ssh.NewPublicKey(key)
// TODO: use ssh.PublicKey instead.
return r.dryadUser.generateAndInstallKey(sshPubKey)
}
// Healthcheck is part of implementation of Dryad interface.
func (r *Rusalka) Healthcheck() (err error) {
return r.stm.powerTick()
}
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