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main.go
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main.go
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package main
import (
"archive/tar"
"bufio"
"bytes"
"context"
"encoding/json"
"flag"
"fmt"
"io"
"net/http"
"os"
"os/exec"
"path"
"path/filepath"
"strings"
"sync"
"time"
"github.com/sirupsen/logrus"
)
const (
ExitOk int = iota
)
type State int
type Handler func(w http.ResponseWriter, r *http.Request) error
const (
StateClaim State = iota
StateProvision
StatePopulate
StateBuild
StateProgress
StateExport
StateDone
StateError
StateSignal
StateTimeout
)
var (
argJSON bool
argBuilderHost string
argBuilderPort int
argTimeoutClaim int
argTimeoutProvision int
argTimeoutPopulate int
argTimeoutBuild int
argTimeoutExport int
argBuildPath string
)
type BuildRequest struct {
Pipelines []string `json:"pipelines"`
Environments []string `json:"environments"`
}
func init() {
flag.BoolVar(&argJSON, "json", false, "Enable JSON output")
flag.StringVar(&argBuilderHost, "builder-host", "localhost", "Hostname or IP where this program will listen on.")
flag.IntVar(&argBuilderPort, "builder-port", 3333, "Port this program will listen on.")
flag.IntVar(&argTimeoutClaim, "timeout-claim", 600, "Timeout before the claim phase needs to be completed in seconds.")
flag.IntVar(&argTimeoutProvision, "timeout-provision", 30, "Timeout before the provision phase needs to be completed in seconds.")
flag.IntVar(&argTimeoutPopulate, "timeout-populate", 300, "Timeout before the populate phase needs to be completed in seconds.")
flag.IntVar(&argTimeoutBuild, "timeout-build", 3600, "Timeout before the build phase needs to be completed in seconds.")
flag.IntVar(&argTimeoutExport, "timeout-export", 1800, "Timeout before the export phase needs to be completed in seconds.")
flag.StringVar(&argBuildPath, "build-path", "/run/osbuild", "Path to use as a build directory.")
flag.Parse()
logrus.SetLevel(logrus.InfoLevel)
if argJSON {
logrus.SetFormatter(&logrus.JSONFormatter{})
}
}
type Builder struct {
Host string
Port int
State State
StateLock sync.Mutex
StateChannel chan State
Build *BackgroundProcess
net *http.Server
}
type BackgroundProcess struct {
Process *exec.Cmd
Stdout *bytes.Buffer
Stderr io.ReadCloser
Done bool
Error error
}
func (builder *Builder) SetState(state State) {
builder.StateLock.Lock()
defer builder.StateLock.Unlock()
if state <= builder.State {
builder.State = StateError
} else {
builder.State = state
}
builder.StateChannel <- builder.State
}
func (builder *Builder) GetState() State {
builder.StateLock.Lock()
defer builder.StateLock.Unlock()
return builder.State
}
func (builder *Builder) GuardState(stateWanted State) {
if stateCurrent := builder.GetState(); stateWanted != stateCurrent {
logrus.Fatalf("Builder.GuardState: Requested guard for %d but we're in %d. Exit", stateWanted, stateCurrent)
}
}
func (builder *Builder) RegisterHandler(h Handler) http.HandlerFunc {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if err := h(w, r); err != nil {
logrus.Fatal(err)
}
})
}
func (builder *Builder) HandleClaim(w http.ResponseWriter, r *http.Request) error {
builder.GuardState(StateClaim)
if r.Method != "POST" {
logrus.WithFields(
logrus.Fields{"method": r.Method},
).Fatal("Builder.HandleClaim: unexpected request method")
}
fmt.Fprintf(w, "%s", "done")
logrus.Info("Builder.HandleClaim: Done")
builder.SetState(StateProvision)
return nil
}
func (builder *Builder) HandleProvision(w http.ResponseWriter, r *http.Request) (err error) {
builder.GuardState(StateProvision)
if r.Method != "PUT" {
return fmt.Errorf("Builder.HandleProvision: Unexpected request method")
}
logrus.WithFields(logrus.Fields{"argBuildPath": argBuildPath}).Debug("Builder.HandleProvision: Opening manifest.json")
dst, err := os.OpenFile(
path.Join(argBuildPath, "manifest.json"),
os.O_WRONLY|os.O_CREATE|os.O_EXCL,
0400,
)
defer func() {
if cerr := dst.Close(); cerr != nil {
err = cerr
}
}()
if err != nil {
return fmt.Errorf("Builder.HandleProvision: Failed to open manifest.json")
}
logrus.Debug("Builder.HandleProvision: Writing manifest.json")
_, err = io.Copy(dst, r.Body)
if err != nil {
return fmt.Errorf("Builder.HandleProvision: Failed to write manifest.json")
}
w.WriteHeader(http.StatusCreated)
if _, err := w.Write([]byte(`done`)); err != nil {
return fmt.Errorf("Builder.HandleProvision: Failed to write response")
}
logrus.Info("Builder.HandleProvision: Done")
builder.SetState(StatePopulate)
return nil
}
func (builder *Builder) HandlePopulate(w http.ResponseWriter, r *http.Request) error {
builder.GuardState(StatePopulate)
if r.Method != "POST" {
return fmt.Errorf("Builder.HandlePopulate: unexpected request method")
}
storePath := path.Join(argBuildPath, "store")
err := os.Mkdir(storePath, 0755)
if err != nil {
return fmt.Errorf("Builder.HandlePopulate: failed to make store directory: %v", err)
}
tarReader := tar.NewReader(r.Body)
for header, err := tarReader.Next(); err != io.EOF; header, err = tarReader.Next() {
if err != nil {
return fmt.Errorf("Builder.HandlerPopulate: failed to unpack sources: %v", err)
}
// gosec seems overly zealous here, as the destination gets verified
dest := filepath.Join(storePath, header.Name) // #nosec G305
if !strings.HasPrefix(dest, filepath.Clean(storePath)) {
return fmt.Errorf("Builder.HandlerPopulate: name not clean: %v doesn't have %v prefix", dest, filepath.Clean(storePath))
}
switch header.Typeflag {
case tar.TypeDir:
if err := os.Mkdir(dest, header.FileInfo().Mode()); err != nil {
return fmt.Errorf("Builder.HandlerPopulate: unable to make dir in sources: %v", err)
}
case tar.TypeReg:
file, err := os.Create(dest)
if err != nil {
return fmt.Errorf("Builder.HandlerPopulate: unable to open file in sources: %v", err)
}
defer file.Close()
// the inputs are trusted so ignore G110
_, err = io.Copy(file, tarReader) // #nosec G110
if err != nil {
return fmt.Errorf("Builder.HandlerPopulate: unable to write file in sources: %v", err)
}
file.Close()
default:
return fmt.Errorf("Builder.HandlerPopulate: unexpected tar header type: %v", header.Typeflag)
}
}
w.WriteHeader(http.StatusOK)
if _, err := w.Write([]byte(`done`)); err != nil {
return fmt.Errorf("Builder.HandlePopulate: Failed to write response")
}
logrus.Info("Builder.HandlePopulate: Done")
builder.SetState(StateBuild)
return nil
}
func (builder *Builder) HandleBuild(w http.ResponseWriter, r *http.Request) error {
builder.GuardState(StateBuild)
if r.Method != "POST" {
return fmt.Errorf("Builder.HandleBuild: Unexpected request method")
}
var buildRequest BuildRequest
var err error
if err = json.NewDecoder(r.Body).Decode(&buildRequest); err != nil {
return fmt.Errorf("HandleBuild: Failed to decode body")
}
if builder.Build != nil {
logrus.Fatal("HandleBuild: Build started but Build was non-nil")
}
args := []string{
"--store", path.Join(argBuildPath, "store"),
"--cache-max-size", "0",
"--output-directory", path.Join(argBuildPath, "export"),
"--json",
}
for _, pipeline := range buildRequest.Pipelines {
args = append(args, "--export")
args = append(args, pipeline)
}
args = append(args, path.Join(argBuildPath, "manifest.json"))
envs := os.Environ()
envs = append(envs, buildRequest.Environments...)
builder.Build = &BackgroundProcess{}
builder.Build.Process = exec.Command(
"/usr/bin/osbuild",
args...,
)
builder.Build.Process.Env = envs
logrus.Infof("BackgroundProcess: Starting %s with %s", builder.Build.Process, envs)
builder.Build.Stdout = &bytes.Buffer{}
builder.Build.Process.Stdout = builder.Build.Stdout
builder.Build.Stderr, err = builder.Build.Process.StderrPipe()
if err != nil {
return err
}
if err := builder.Build.Process.Start(); err != nil {
return fmt.Errorf("BackgroundProcess: Failed to start process")
}
go func() {
builder.Build.Error = builder.Build.Process.Wait()
builder.Build.Done = true
logrus.Info("BackgroundProcess: Exited")
}()
go func() {
scanner := bufio.NewScanner(builder.Build.Stderr)
for scanner.Scan() {
m := scanner.Text()
logrus.Infof("BackgroundProcess: Stderr: %s", m)
}
}()
w.WriteHeader(http.StatusCreated)
builder.SetState(StateProgress)
return nil
}
func (builder *Builder) HandleProgress(w http.ResponseWriter, r *http.Request) error {
builder.GuardState(StateProgress)
if r.Method != "GET" {
return fmt.Errorf("Builder.HandleProgress: Unexpected request method")
}
if builder.Build == nil {
return fmt.Errorf("HandleProgress: Progress requested but Build was nil")
}
if builder.Build.Done {
w.WriteHeader(http.StatusOK)
if builder.Build.Error != nil {
return fmt.Errorf("Builder.HandleBuild: Buildprocess exited with error: %s", builder.Build.Error)
}
if _, err := w.Write(builder.Build.Stdout.Bytes()); err != nil {
return fmt.Errorf("Builder.HandleBuild: Failed to write response")
}
builder.SetState(StateExport)
} else {
w.WriteHeader(http.StatusAccepted)
}
logrus.Info("Builder.HandleBuild: Done")
return nil
}
func (builder *Builder) HandleExport(w http.ResponseWriter, r *http.Request) error {
builder.GuardState(StateExport)
if r.Method != "GET" {
return fmt.Errorf("Builder.HandleExport: unexpected request method")
}
exportPath := r.URL.Query().Get("path")
if exportPath == "" {
return fmt.Errorf("Builder.HandleExport: Missing export")
}
// XXX check subdir
srcPath := path.Join(argBuildPath, "export", exportPath)
src, err := os.Open(
srcPath,
)
if err != nil {
return fmt.Errorf("Builder.HandleExport: Failed to open source: %s", err)
}
_, err = io.Copy(w, src)
if err != nil {
return fmt.Errorf("Builder.HandleExport: Failed to write response: %s", err)
}
logrus.Info("Builder.HandleExport: Done")
builder.SetState(StateDone)
return nil
}
func (builder *Builder) Serve() error {
mux := http.NewServeMux()
mux.HandleFunc("/claim", builder.RegisterHandler(builder.HandleClaim))
mux.HandleFunc("/provision", builder.RegisterHandler(builder.HandleProvision))
mux.HandleFunc("/populate", builder.RegisterHandler(builder.HandlePopulate))
mux.HandleFunc("/build", builder.RegisterHandler(builder.HandleBuild))
mux.HandleFunc("/progress", builder.RegisterHandler(builder.HandleProgress))
mux.HandleFunc("/export", builder.RegisterHandler(builder.HandleExport))
/* #nosec G112 */
builder.net = &http.Server{
Addr: fmt.Sprintf("%s:%d", builder.Host, builder.Port),
Handler: mux,
}
return builder.net.ListenAndServe()
}
func main() {
logrus.WithFields(
logrus.Fields{
"argJSON": argJSON,
"argBuilderHost": argBuilderHost,
"argBuilderPort": argBuilderPort,
"argTimeoutClaim": argTimeoutClaim,
"argTimeoutProvision": argTimeoutProvision,
"argTimeoutBuild": argTimeoutBuild,
"argTimeoutExport": argTimeoutExport,
}).Info("main: Starting up")
builder := Builder{
State: StateClaim,
StateChannel: make(chan State, 1),
Host: argBuilderHost,
Port: argBuilderPort,
}
errs := make(chan error, 1)
go func(errs chan<- error) {
if err := builder.Serve(); err != nil {
errs <- err
}
}(errs)
for {
select {
case state := <-builder.StateChannel:
if state == StateDone {
ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
if err := builder.net.Shutdown(ctx); err != nil {
logrus.Errorf("main: server shutdown failed: %v", err)
}
cancel()
logrus.Info("main: Shutting down successfully")
os.Exit(ExitOk)
}
case err := <-errs:
logrus.Fatal(err)
}
}
}