wings/server/install.go

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package server
import (
"bufio"
"bytes"
"context"
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"github.com/apex/log"
"github.com/docker/docker/api/types"
"github.com/docker/docker/api/types/container"
"github.com/docker/docker/api/types/mount"
"github.com/docker/docker/client"
"github.com/pkg/errors"
"github.com/pterodactyl/wings/api"
"github.com/pterodactyl/wings/config"
"golang.org/x/sync/semaphore"
"io"
"io/ioutil"
"os"
"path"
"path/filepath"
"sync"
"time"
)
// Executes the installation stack for a server process. Bubbles any errors up to the calling
// function which should handle contacting the panel to notify it of the server state.
func (s *Server) Install() error {
err := s.internalInstall()
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s.Log().Debug("notifying panel of server install state")
if serr := s.SyncInstallState(err == nil); serr != nil {
l := s.Log().WithField("was_successful", err == nil)
// If the request was successful but there was an error with this request, attach the
// error to this log entry. Otherwise ignore it in this log since whatever is calling
// this function should handle the error and will end up logging the same one.
if err == nil {
l.WithField("error", serr)
}
l.Warn("failed to notify panel of server install state")
}
return err
}
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// Reinstalls a server's software by utilizing the install script for the server egg. This
// does not touch any existing files for the server, other than what the script modifies.
func (s *Server) Reinstall() error {
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if s.GetState() != ProcessOfflineState {
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s.Log().Debug("waiting for server instance to enter a stopped state")
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if err := s.Environment.WaitForStop(10, true); err != nil {
return err
}
}
return s.Install()
}
// Internal installation function used to simplify reporting back to the Panel.
func (s *Server) internalInstall() error {
script, rerr, err := api.NewRequester().GetInstallationScript(s.Uuid)
if err != nil || rerr != nil {
if err != nil {
return err
}
return errors.New(rerr.String())
}
p, err := NewInstallationProcess(s, &script)
if err != nil {
return errors.WithStack(err)
}
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s.Log().Info("beginning installation process for server")
if err := p.Run(); err != nil {
return err
}
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s.Log().Info("completed installation process for server")
return nil
}
type InstallationProcess struct {
Server *Server
Script *api.InstallationScript
client *client.Client
context context.Context
}
// Generates a new installation process struct that will be used to create containers,
// and otherwise perform installation commands for a server.
func NewInstallationProcess(s *Server, script *api.InstallationScript) (*InstallationProcess, error) {
proc := &InstallationProcess{
Script: script,
Server: s,
}
ctx, cancel := context.WithCancel(context.Background())
s.installer.cancel = &cancel
if c, err := client.NewClientWithOpts(client.FromEnv); err != nil {
return nil, errors.WithStack(err)
} else {
proc.client = c
proc.context = ctx
}
return proc, nil
}
// Try to obtain an exclusive lock on the installation process for the server. Waits up to 10
// seconds before aborting with a context timeout.
func (s *Server) acquireInstallationLock() error {
if s.installer.sem == nil {
s.installer.sem = semaphore.NewWeighted(1)
}
ctx, _ := context.WithTimeout(context.Background(), time.Second*10)
return s.installer.sem.Acquire(ctx, 1)
}
// Determines if the server is actively running the installation process by checking the status
// of the semaphore lock.
func (s *Server) IsInstalling() bool {
if s.installer.sem == nil {
return false
}
if s.installer.sem.TryAcquire(1) {
// If we made it into this block it means we were able to obtain an exclusive lock
// on the semaphore. In that case, go ahead and release that lock immediately, and
// return false.
s.installer.sem.Release(1)
return false
}
return true
}
// Aborts the server installation process by calling the cancel function on the installer
// context.
func (s *Server) AbortInstallation() {
if !s.IsInstalling() {
return
}
if s.installer.cancel != nil {
cancel := *s.installer.cancel
s.Log().Warn("aborting running installation process")
cancel()
}
}
// Removes the installer container for the server.
func (ip *InstallationProcess) RemoveContainer() {
err := ip.client.ContainerRemove(ip.context, ip.Server.Uuid+"_installer", types.ContainerRemoveOptions{
RemoveVolumes: true,
Force: true,
})
if err != nil && !client.IsErrNotFound(err) {
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ip.Server.Log().WithField("error", errors.WithStack(err)).Warn("failed to delete server install container")
}
}
// Runs the installation process, this is done as a backgrounded thread. This will configure
// the required environment, and then spin up the installation container.
//
// Once the container finishes installing the results will be stored in an installation
// log in the server's configuration directory.
func (ip *InstallationProcess) Run() error {
ip.Server.Log().Debug("acquiring installation process lock")
if err := ip.Server.acquireInstallationLock(); err != nil {
return err
}
// We now have an exclusive lock on this installation process. Ensure that whenever this
// process is finished that the semaphore is released so that other processes and be executed
// without encounting a wait timeout.
defer func() {
ip.Server.Log().Debug("releasing installation process lock")
ip.Server.installer.sem.Release(1)
ip.Server.installer.cancel = nil
}()
installPath, err := ip.BeforeExecute()
if err != nil {
return err
}
cid, err := ip.Execute(installPath)
if err != nil {
ip.RemoveContainer()
return err
}
// If this step fails, log a warning but don't exit out of the process. This is completely
// internal to the daemon's functionality, and does not affect the status of the server itself.
if err := ip.AfterExecute(cid); err != nil {
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ip.Server.Log().WithField("error", err).Warn("failed to complete after-execute step of installation process")
}
return nil
}
// Writes the installation script to a temporary file on the host machine so that it
// can be properly mounted into the installation container and then executed.
func (ip *InstallationProcess) writeScriptToDisk() (string, error) {
// Make sure the temp directory root exists before trying to make a directory within it. The
// ioutil.TempDir call expects this base to exist, it won't create it for you.
if err := os.MkdirAll(path.Join(os.TempDir(), "pterodactyl/"), 0700); err != nil {
return "", errors.WithStack(err)
}
d, err := ioutil.TempDir("", "pterodactyl/")
if err != nil {
return "", errors.WithStack(err)
}
f, err := os.OpenFile(filepath.Join(d, "install.sh"), os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0644)
if err != nil {
return "", errors.WithStack(err)
}
defer f.Close()
w := bufio.NewWriter(f)
scanner := bufio.NewScanner(bytes.NewReader([]byte(ip.Script.Script)))
for scanner.Scan() {
w.WriteString(scanner.Text() + "\n")
}
if err := scanner.Err(); err != nil {
return "", errors.WithStack(err)
}
w.Flush()
return d, nil
}
// Pulls the docker image to be used for the installation container.
func (ip *InstallationProcess) pullInstallationImage() error {
r, err := ip.client.ImagePull(ip.context, ip.Script.ContainerImage, types.ImagePullOptions{})
if err != nil {
return errors.WithStack(err)
}
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// Block continuation until the image has been pulled successfully.
scanner := bufio.NewScanner(r)
for scanner.Scan() {
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log.Debug(scanner.Text())
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}
if err := scanner.Err(); err != nil {
return errors.WithStack(err)
}
return nil
}
// Runs before the container is executed. This pulls down the required docker container image
// as well as writes the installation script to the disk. This process is executed in an async
// manner, if either one fails the error is returned.
func (ip *InstallationProcess) BeforeExecute() (string, error) {
wg := sync.WaitGroup{}
wg.Add(3)
var e []error
var fileName string
go func() {
defer wg.Done()
name, err := ip.writeScriptToDisk()
if err != nil {
e = append(e, err)
return
}
fileName = name
}()
go func() {
defer wg.Done()
if err := ip.pullInstallationImage(); err != nil {
e = append(e, err)
}
}()
go func() {
defer wg.Done()
opts := types.ContainerRemoveOptions{
RemoveVolumes: true,
Force: true,
}
if err := ip.client.ContainerRemove(ip.context, ip.Server.Uuid+"_installer", opts); err != nil {
if !client.IsErrNotFound(err) {
e = append(e, err)
}
}
}()
wg.Wait()
// Maybe a better way to handle this, but if there is at least one error
// just bail out of the process now.
if len(e) > 0 {
return "", errors.WithStack(e[0])
}
return fileName, nil
}
// Returns the log path for the installation process.
func (ip *InstallationProcess) GetLogPath() string {
return filepath.Join(config.Get().System.GetInstallLogPath(), ip.Server.Uuid+".log")
}
// Cleans up after the execution of the installation process. This grabs the logs from the
// process to store in the server configuration directory, and then destroys the associated
// installation container.
func (ip *InstallationProcess) AfterExecute(containerId string) error {
defer ip.RemoveContainer()
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ip.Server.Log().WithField("container_id", containerId).Debug("pulling installation logs for server")
reader, err := ip.client.ContainerLogs(ip.context, containerId, types.ContainerLogsOptions{
ShowStdout: true,
ShowStderr: true,
Follow: false,
})
if err != nil && !client.IsErrNotFound(err) {
return errors.WithStack(err)
}
f, err := os.OpenFile(ip.GetLogPath(), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
if err != nil {
return errors.WithStack(err)
}
defer f.Close()
// We write the contents of the container output to a more "permanent" file so that they
// can be referenced after this container is deleted.
if _, err := io.Copy(f, reader); err != nil {
return errors.WithStack(err)
}
return nil
}
// Executes the installation process inside a specially created docker container.
func (ip *InstallationProcess) Execute(installPath string) (string, error) {
conf := &container.Config{
Hostname: "installer",
AttachStdout: true,
AttachStderr: true,
AttachStdin: true,
OpenStdin: true,
Tty: true,
Cmd: []string{ip.Script.Entrypoint, "./mnt/install/install.sh"},
Image: ip.Script.ContainerImage,
Env: ip.Server.GetEnvironmentVariables(),
Labels: map[string]string{
"Service": "Pterodactyl",
"ContainerType": "server_installer",
},
}
hostConf := &container.HostConfig{
Mounts: []mount.Mount{
{
Target: "/mnt/server",
Source: ip.Server.Filesystem.Path(),
Type: mount.TypeBind,
ReadOnly: false,
},
{
Target: "/mnt/install",
Source: installPath,
Type: mount.TypeBind,
ReadOnly: false,
},
},
Tmpfs: map[string]string{
"/tmp": "rw,exec,nosuid,size=50M",
},
DNS: config.Get().Docker.Network.Dns,
LogConfig: container.LogConfig{
Type: "local",
Config: map[string]string{
"max-size": "5m",
"max-file": "1",
"compress": "false",
},
},
Privileged: true,
NetworkMode: container.NetworkMode(config.Get().Docker.Network.Mode),
}
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ip.Server.Log().WithField("install_script", installPath+"/install.sh").Info("creating install container for server process")
r, err := ip.client.ContainerCreate(ip.context, conf, hostConf, nil, ip.Server.Uuid+"_installer")
if err != nil {
return "", errors.WithStack(err)
}
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ip.Server.Log().WithField("container_id", r.ID).Info("running installation script for server in container")
if err := ip.client.ContainerStart(ip.context, r.ID, types.ContainerStartOptions{}); err != nil {
return "", err
}
go func(id string) {
ip.Server.Events().Publish(DaemonMessageEvent, "Starting installation process, this could take a few minutes...")
if err := ip.StreamOutput(id); err != nil {
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ip.Server.Log().WithField("error", err).Error("error while handling output stream for server install process")
}
ip.Server.Events().Publish(DaemonMessageEvent, "Installation process completed.")
}(r.ID)
sChann, eChann := ip.client.ContainerWait(ip.context, r.ID, container.WaitConditionNotRunning)
select {
case err := <-eChann:
if err != nil {
return "", errors.WithStack(err)
}
case <-sChann:
}
return r.ID, nil
}
// Streams the output of the installation process to a log file in the server configuration
// directory, as well as to a websocket listener so that the process can be viewed in
// the panel by administrators.
func (ip *InstallationProcess) StreamOutput(id string) error {
reader, err := ip.client.ContainerLogs(ip.context, id, types.ContainerLogsOptions{
ShowStdout: true,
ShowStderr: true,
Follow: true,
})
if err != nil {
return errors.WithStack(err)
}
defer reader.Close()
s := bufio.NewScanner(reader)
for s.Scan() {
ip.Server.Events().Publish(InstallOutputEvent, s.Text())
}
if err := s.Err(); err != nil {
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ip.Server.Log().WithFields(log.Fields{
"container_id": id,
"error": errors.WithStack(err),
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}).Warn("error processing scanner line in installation output for server")
}
return nil
}
// Makes a HTTP request to the Panel instance notifying it that the server has
// completed the installation process, and what the state of the server is. A boolean
// value of "true" means everything was successful, "false" means something went
// wrong and the server must be deleted and re-created.
func (s *Server) SyncInstallState(successful bool) error {
r := api.NewRequester()
rerr, err := r.SendInstallationStatus(s.Uuid, successful)
if rerr != nil || err != nil {
if err != nil {
return errors.WithStack(err)
}
return errors.New(rerr.String())
}
return nil
}