forked from moby/buildkit
/
main.go
422 lines (380 loc) · 10.1 KB
/
main.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
package main
import (
"context"
"crypto/tls"
"crypto/x509"
"fmt"
"io/ioutil"
"net"
"os"
"os/user"
"path/filepath"
"sort"
"strconv"
"strings"
"github.com/containerd/containerd/sys"
"github.com/docker/go-connections/sockets"
"github.com/grpc-ecosystem/grpc-opentracing/go/otgrpc"
"github.com/moby/buildkit/cache/remotecache"
"github.com/moby/buildkit/control"
"github.com/moby/buildkit/frontend"
"github.com/moby/buildkit/frontend/dockerfile"
"github.com/moby/buildkit/frontend/gateway"
"github.com/moby/buildkit/session"
"github.com/moby/buildkit/solver/boltdbcachestorage"
"github.com/moby/buildkit/util/appcontext"
"github.com/moby/buildkit/util/appdefaults"
"github.com/moby/buildkit/util/profiler"
"github.com/moby/buildkit/worker"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"github.com/urfave/cli"
"golang.org/x/sync/errgroup"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
)
type workerInitializerOpt struct {
sessionManager *session.Manager
root string
}
type workerInitializer struct {
fn func(c *cli.Context, common workerInitializerOpt) ([]worker.Worker, error)
// less priority number, more preferred
priority int
}
var (
appFlags []cli.Flag
workerInitializers []workerInitializer
)
func registerWorkerInitializer(wi workerInitializer, flags ...cli.Flag) {
workerInitializers = append(workerInitializers, wi)
sort.Slice(workerInitializers,
func(i, j int) bool {
return workerInitializers[i].priority < workerInitializers[j].priority
})
appFlags = append(appFlags, flags...)
}
func main() {
app := cli.NewApp()
app.Name = "buildkitd"
app.Usage = "build daemon"
app.Flags = []cli.Flag{
cli.BoolFlag{
Name: "debug",
Usage: "enable debug output in logs",
},
cli.StringFlag{
Name: "root",
Usage: "path to state directory",
Value: appdefaults.Root,
},
cli.StringSliceFlag{
Name: "addr",
Usage: "listening address (socket or tcp)",
Value: &cli.StringSlice{appdefaults.Address},
},
cli.StringFlag{
Name: "group",
Usage: "group (name or gid) which will own all Unix socket listening addresses",
Value: "",
},
cli.StringFlag{
Name: "debugaddr",
Usage: "debugging address (eg. 0.0.0.0:6060)",
Value: "",
},
cli.StringFlag{
Name: "tlscert",
Usage: "certificate file to use",
},
cli.StringFlag{
Name: "tlskey",
Usage: "key file to use",
},
cli.StringFlag{
Name: "tlscacert",
Usage: "ca certificate to verify clients",
},
}
app.Flags = append(app.Flags, appFlags...)
app.Action = func(c *cli.Context) error {
ctx, cancel := context.WithCancel(appcontext.Context())
defer cancel()
if debugAddr := c.GlobalString("debugaddr"); debugAddr != "" {
if err := setupDebugHandlers(debugAddr); err != nil {
return err
}
}
opts := []grpc.ServerOption{unaryInterceptor(ctx), grpc.StreamInterceptor(otgrpc.OpenTracingStreamServerInterceptor(tracer))}
creds, err := serverCredentials(c)
if err != nil {
return err
}
if creds != nil {
opts = append(opts, creds)
}
server := grpc.NewServer(opts...)
// relative path does not work with nightlyone/lockfile
root, err := filepath.Abs(c.GlobalString("root"))
if err != nil {
return err
}
if err := os.MkdirAll(root, 0700); err != nil {
return errors.Wrapf(err, "failed to create %s", root)
}
controller, err := newController(c, root)
if err != nil {
return err
}
controller.Register(server)
errCh := make(chan error, 1)
addrs := c.GlobalStringSlice("addr")
if len(addrs) > 1 {
addrs = addrs[1:] // https://github.com/urfave/cli/issues/160
}
if err := serveGRPC(c, server, addrs, errCh); err != nil {
return err
}
select {
case serverErr := <-errCh:
err = serverErr
cancel()
case <-ctx.Done():
err = ctx.Err()
}
logrus.Infof("stopping server")
server.GracefulStop()
return err
}
app.Before = func(context *cli.Context) error {
if context.GlobalBool("debug") {
logrus.SetLevel(logrus.DebugLevel)
}
return nil
}
app.After = func(context *cli.Context) error {
if closeTracer != nil {
return closeTracer.Close()
}
return nil
}
profiler.Attach(app)
if err := app.Run(os.Args); err != nil {
fmt.Fprintf(os.Stderr, "buildkitd: %s\n", err)
os.Exit(1)
}
}
func serveGRPC(c *cli.Context, server *grpc.Server, addrs []string, errCh chan error) error {
if len(addrs) == 0 {
return errors.New("--addr cannot be empty")
}
eg, _ := errgroup.WithContext(context.Background())
listeners := make([]net.Listener, 0, len(addrs))
for _, addr := range addrs {
l, err := getListener(c, addr)
if err != nil {
for _, l := range listeners {
l.Close()
}
return err
}
listeners = append(listeners, l)
}
for _, l := range listeners {
func(l net.Listener) {
eg.Go(func() error {
defer l.Close()
logrus.Infof("running server on %s", l.Addr())
return server.Serve(l)
})
}(l)
}
go func() {
errCh <- eg.Wait()
}()
return nil
}
// Convert a string containing either a group name or a stringified gid into a numeric id)
func groupToGid(group string) (int, error) {
if group == "" {
return os.Getgid(), nil
}
var (
err error
id int
)
// Try and parse as a number, if the error is ErrSyntax
// (i.e. its not a number) then we carry on and try it as a
// name.
if id, err = strconv.Atoi(group); err == nil {
return id, nil
} else if err.(*strconv.NumError).Err != strconv.ErrSyntax {
return 0, err
}
ginfo, err := user.LookupGroup(group)
if err != nil {
return 0, err
}
group = ginfo.Gid
if id, err = strconv.Atoi(group); err != nil {
return 0, err
}
return id, nil
}
func getListener(c *cli.Context, addr string) (net.Listener, error) {
addrSlice := strings.SplitN(addr, "://", 2)
if len(addrSlice) < 2 {
return nil, errors.Errorf("address %s does not contain proto, you meant unix://%s ?",
addr, addr)
}
proto := addrSlice[0]
listenAddr := addrSlice[1]
switch proto {
case "unix", "npipe":
uid := os.Getuid()
gid, err := groupToGid(c.GlobalString("group"))
if err != nil {
return nil, err
}
return sys.GetLocalListener(listenAddr, uid, gid)
case "tcp":
return sockets.NewTCPSocket(listenAddr, nil)
default:
return nil, errors.Errorf("addr %s not supported", addr)
}
}
func unaryInterceptor(globalCtx context.Context) grpc.ServerOption {
withTrace := otgrpc.OpenTracingServerInterceptor(tracer, otgrpc.LogPayloads())
return grpc.UnaryInterceptor(func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (resp interface{}, err error) {
ctx, cancel := context.WithCancel(ctx)
defer cancel()
go func() {
select {
case <-ctx.Done():
case <-globalCtx.Done():
cancel()
}
}()
resp, err = withTrace(ctx, req, info, handler)
if err != nil {
logrus.Errorf("%s returned error: %+v", info.FullMethod, err)
}
return
})
}
func serverCredentials(c *cli.Context) (grpc.ServerOption, error) {
certFile := c.GlobalString("tlscert")
keyFile := c.GlobalString("tlskey")
caFile := c.GlobalString("tlscacert")
if certFile == "" && keyFile == "" {
return nil, nil
}
err := errors.New("you must specify key and cert file if one is specified")
if certFile == "" {
return nil, err
}
if keyFile == "" {
return nil, err
}
certificate, err := tls.LoadX509KeyPair(certFile, keyFile)
if err != nil {
return nil, errors.Wrap(err, "could not load server key pair")
}
tlsConf := &tls.Config{
Certificates: []tls.Certificate{certificate},
}
if caFile != "" {
certPool := x509.NewCertPool()
ca, err := ioutil.ReadFile(caFile)
if err != nil {
return nil, errors.Wrap(err, "could not read ca certificate")
}
// Append the client certificates from the CA
if ok := certPool.AppendCertsFromPEM(ca); !ok {
return nil, errors.New("failed to append ca cert")
}
tlsConf.ClientAuth = tls.RequireAndVerifyClientCert
tlsConf.ClientCAs = certPool
}
creds := grpc.Creds(credentials.NewTLS(tlsConf))
return creds, nil
}
func newController(c *cli.Context, root string) (*control.Controller, error) {
sessionManager, err := session.NewManager()
if err != nil {
return nil, err
}
wc, err := newWorkerController(c, workerInitializerOpt{
sessionManager: sessionManager,
root: root,
})
if err != nil {
return nil, err
}
frontends := map[string]frontend.Frontend{}
frontends["dockerfile.v0"] = dockerfile.NewDockerfileFrontend()
frontends["gateway.v0"] = gateway.NewGatewayFrontend()
ce := remotecache.NewCacheExporter(remotecache.ExporterOpt{
SessionManager: sessionManager,
})
// cache importer is a manager concept but as there is no way to pull data
// into specific worker yet we currently set it up as part of default worker
w, err := wc.GetDefault()
if err != nil {
return nil, err
}
ci := remotecache.NewCacheImporter(remotecache.ImportOpt{
Worker: w,
SessionManager: sessionManager,
})
cacheStorage, err := boltdbcachestorage.NewStore(filepath.Join(root, "cache.db"))
if err != nil {
return nil, err
}
return control.NewController(control.Opt{
SessionManager: sessionManager,
WorkerController: wc,
Frontends: frontends,
CacheExporter: ce,
CacheImporter: ci,
CacheKeyStorage: cacheStorage,
})
}
func newWorkerController(c *cli.Context, wiOpt workerInitializerOpt) (*worker.Controller, error) {
wc := &worker.Controller{}
nWorkers := 0
for _, wi := range workerInitializers {
ws, err := wi.fn(c, wiOpt)
if err != nil {
return nil, err
}
for _, w := range ws {
logrus.Infof("found worker %q, labels=%v", w.ID(), w.Labels())
if err = wc.Add(w); err != nil {
return nil, err
}
nWorkers++
}
}
if nWorkers == 0 {
return nil, errors.New("no worker found, rebuild the buildkit daemon?")
}
defaultWorker, err := wc.GetDefault()
if err != nil {
return nil, err
}
logrus.Infof("found %d workers, default=%q", nWorkers, defaultWorker.ID())
logrus.Warn("currently, only the default worker can be used.")
return wc, nil
}
func attrMap(sl []string) (map[string]string, error) {
m := map[string]string{}
for _, v := range sl {
parts := strings.SplitN(v, "=", 2)
if len(parts) != 2 {
return nil, errors.Errorf("invalid value %s", v)
}
m[parts[0]] = parts[1]
}
return m, nil
}