vendor: update buildkit to f238f1ef

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
(cherry picked from commit a3cbd53ed2)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

vendor.conf

@@ -27,7 +27,7 @@ github.com/imdario/mergo                            7c29201646fa3de8506f70121347
 golang.org/x/sync                                   e225da77a7e68af35c70ccbf71af2b83e6acac3c
 
 # buildkit
-github.com/moby/buildkit                            8c0fa8fdec187d8f259a349d2da16dc2dc5f144a # v0.5.0
+github.com/moby/buildkit                            f238f1efb04f00bf0cc147141fda9ddb55c8bc49
 github.com/tonistiigi/fsutil                        3bbb99cdbd76619ab717299830c60f6f2a533a6b
 github.com/grpc-ecosystem/grpc-opentracing          8e809c8a86450a29b90dcc9efbf062d0fe6d9746
 github.com/opentracing/opentracing-go               1361b9cd60be79c4c3a7fa9841b3c132e40066a7

vendor/github.com/moby/buildkit/client/llb/exec.go

@@ -177,7 +177,7 @@ func (e *ExecOp) Marshal(c *Constraints) (digest.Digest, []byte, *pb.OpMetadata,
 		addCap(&e.constraints, pb.CapExecMetaNetwork)
 	}
 
-	if e.meta.Security != SecurityModeInsecure {
+	if e.meta.Security != SecurityModeSandbox {
 		addCap(&e.constraints, pb.CapExecMetaSecurity)
 	}
 

vendor/github.com/moby/buildkit/client/solve.go

@@ -410,9 +410,6 @@ func parseCacheOptions(opt SolveOpt) (*cacheOptions, error) {
 			if csDir == "" {
 				return nil, errors.New("local cache importer requires src")
 			}
-			if err := os.MkdirAll(csDir, 0755); err != nil {
-				return nil, err
-			}
 			cs, err := contentlocal.NewStore(csDir)
 			if err != nil {
 				return nil, err

vendor/github.com/moby/buildkit/control/gateway/gateway.go

@@ -63,7 +63,9 @@ func (gwf *GatewayForwarder) lookupForwarder(ctx context.Context) (gateway.LLBBr
 
 	go func() {
 		<-ctx.Done()
+		gwf.mu.Lock()
 		gwf.updateCond.Broadcast()
+		gwf.mu.Unlock()
 	}()
 
 	gwf.mu.RLock()

vendor/github.com/moby/buildkit/executor/oci/spec_unix.go

@@ -95,6 +95,23 @@ func GenerateSpec(ctx context.Context, meta executor.Meta, mounts []executor.Mou
 		Options:     []string{"ro", "nosuid", "noexec", "nodev"},
 	})
 
+	if processMode == NoProcessSandbox {
+		var maskedPaths []string
+		for _, s := range s.Linux.MaskedPaths {
+			if !hasPrefix(s, "/proc") {
+				maskedPaths = append(maskedPaths, s)
+			}
+		}
+		s.Linux.MaskedPaths = maskedPaths
+		var readonlyPaths []string
+		for _, s := range s.Linux.ReadonlyPaths {
+			if !hasPrefix(s, "/proc") {
+				readonlyPaths = append(readonlyPaths, s)
+			}
+		}
+		s.Linux.ReadonlyPaths = readonlyPaths
+	}
+
 	if meta.SecurityMode == pb.SecurityMode_INSECURE {
 		//make sysfs rw mount for insecure mode.
 		for _, m := range s.Mounts {

vendor/github.com/moby/buildkit/executor/runcexecutor/executor.go

@@ -41,6 +41,8 @@ type Opt struct {
 	// ProcessMode
 	ProcessMode     oci.ProcessMode
 	IdentityMapping *idtools.IdentityMapping
+	// runc run --no-pivot (unrecommended)
+	NoPivot bool
 }
 
 var defaultCommandCandidates = []string{"buildkit-runc", "runc"}
@@ -54,6 +56,7 @@ type runcExecutor struct {
 	networkProviders map[pb.NetMode]network.Provider
 	processMode      oci.ProcessMode
 	idmap            *idtools.IdentityMapping
+	noPivot          bool
 }
 
 func New(opt Opt, networkProviders map[pb.NetMode]network.Provider) (executor.Executor, error) {
@@ -111,6 +114,7 @@ func New(opt Opt, networkProviders map[pb.NetMode]network.Provider) (executor.Ex
 		networkProviders: networkProviders,
 		processMode:      opt.ProcessMode,
 		idmap:            opt.IdentityMapping,
+		noPivot:          opt.NoPivot,
 	}
 	return w, nil
 }
@@ -193,6 +197,17 @@ func (w *runcExecutor) Exec(ctx context.Context, meta executor.Meta, root cache.
 		opts = append(opts, containerdoci.WithRootFSReadonly())
 	}
 
+	identity = idtools.Identity{
+		UID: int(uid),
+		GID: int(gid),
+	}
+	if w.idmap != nil {
+		identity, err = w.idmap.ToHost(identity)
+		if err != nil {
+			return err
+		}
+	}
+
 	if w.cgroupParent != "" {
 		var cgroupsPath string
 		lastSeparator := w.cgroupParent[len(w.cgroupParent)-1:]
@@ -269,7 +284,8 @@ func (w *runcExecutor) Exec(ctx context.Context, meta executor.Meta, root cache.
 
 	logrus.Debugf("> creating %s %v", id, meta.Args)
 	status, err := w.runc.Run(runCtx, id, bundle, &runc.CreateOpts{
-		IO: &forwardIO{stdin: stdin, stdout: stdout, stderr: stderr},
+		IO:      &forwardIO{stdin: stdin, stdout: stdout, stderr: stderr},
+		NoPivot: w.noPivot,
 	})
 	close(done)
 	if err != nil {

vendor/github.com/moby/buildkit/frontend/dockerfile/dockerfile2llb/convert.go

@@ -172,10 +172,6 @@ func Dockerfile2LLB(ctx context.Context, dt []byte, opt ConvertOpt) (*llb.State,
 		}
 	}
 
-	if len(allDispatchStates.states) == 1 {
-		allDispatchStates.states[0].stageName = ""
-	}
-
 	var target *dispatchState
 	if opt.Target == "" {
 		target = allDispatchStates.lastTarget()
@@ -207,6 +203,14 @@ func Dockerfile2LLB(ctx context.Context, dt []byte, opt ConvertOpt) (*llb.State,
 		}
 	}
 
+	if has, state := hasCircularDependency(allDispatchStates.states); has {
+		return nil, nil, fmt.Errorf("circular dependency detected on stage: %s", state.stageName)
+	}
+
+	if len(allDispatchStates.states) == 1 {
+		allDispatchStates.states[0].stageName = ""
+	}
+
 	eg, ctx := errgroup.WithContext(ctx)
 	for i, d := range allDispatchStates.states {
 		reachable := isReachable(target, d)
@@ -1130,6 +1134,41 @@ func isReachable(from, to *dispatchState) (ret bool) {
 	return false
 }
 
+func hasCircularDependency(states []*dispatchState) (bool, *dispatchState) {
+	var visit func(state *dispatchState) bool
+	if states == nil {
+		return false, nil
+	}
+	visited := make(map[*dispatchState]struct{})
+	path := make(map[*dispatchState]struct{})
+
+	visit = func(state *dispatchState) bool {
+		_, ok := visited[state]
+		if ok {
+			return false
+		}
+		visited[state] = struct{}{}
+		path[state] = struct{}{}
+		for dep := range state.deps {
+			_, ok = path[dep]
+			if ok {
+				return true
+			}
+			if visit(dep) {
+				return true
+			}
+		}
+		delete(path, state)
+		return false
+	}
+	for _, state := range states {
+		if visit(state) {
+			return true, state
+		}
+	}
+	return false, nil
+}
+
 func parseUser(str string) (uid uint32, gid uint32, err error) {
 	if str == "" {
 		return 0, 0, nil

vendor/github.com/moby/buildkit/frontend/gateway/gateway.go

@@ -158,7 +158,7 @@ func (gf *gatewayFrontend) Solve(ctx context.Context, llbBridge frontend.Fronten
 		rootFS = workerRef.ImmutableRef
 	}
 
-	lbf, err := newLLBBridgeForwarder(ctx, llbBridge, gf.workers)
+	lbf, ctx, err := newLLBBridgeForwarder(ctx, llbBridge, gf.workers)
 	defer lbf.conn.Close()
 	if err != nil {
 		return nil, err
@@ -210,6 +210,9 @@ func (gf *gatewayFrontend) Solve(ctx context.Context, llbBridge frontend.Fronten
 	err = llbBridge.Exec(ctx, meta, rootFS, lbf.Stdin, lbf.Stdout, os.Stderr)
 
 	if err != nil {
+		if errors.Cause(err) == context.Canceled && lbf.isErrServerClosed {
+			err = errors.Errorf("frontend grpc server closed unexpectedly")
+		}
 		// An existing error (set via Return rpc) takes
 		// precedence over this error, which in turn takes
 		// precedence over a success reported via Return.
@@ -294,15 +297,24 @@ func NewBridgeForwarder(ctx context.Context, llbBridge frontend.FrontendLLBBridg
 	return lbf
 }
 
-func newLLBBridgeForwarder(ctx context.Context, llbBridge frontend.FrontendLLBBridge, workers frontend.WorkerInfos) (*llbBridgeForwarder, error) {
+func newLLBBridgeForwarder(ctx context.Context, llbBridge frontend.FrontendLLBBridge, workers frontend.WorkerInfos) (*llbBridgeForwarder, context.Context, error) {
+	ctx, cancel := context.WithCancel(ctx)
 	lbf := NewBridgeForwarder(ctx, llbBridge, workers)
 	server := grpc.NewServer()
 	grpc_health_v1.RegisterHealthServer(server, health.NewServer())
 	pb.RegisterLLBBridgeServer(server, lbf)
 
-	go serve(ctx, server, lbf.conn)
+	go func() {
+		serve(ctx, server, lbf.conn)
+		select {
+		case <-ctx.Done():
+		default:
+			lbf.isErrServerClosed = true
+		}
+		cancel()
+	}()
 
-	return lbf, nil
+	return lbf, ctx, nil
 }
 
 type pipe struct {
@@ -372,11 +384,12 @@ type llbBridgeForwarder struct {
 	// lastRef      solver.CachedResult
 	// lastRefs     map[string]solver.CachedResult
 	// err          error
-	doneCh       chan struct{} // closed when result or err become valid through a call to a Return
-	result       *frontend.Result
-	err          error
-	exporterAttr map[string][]byte
-	workers      frontend.WorkerInfos
+	doneCh            chan struct{} // closed when result or err become valid through a call to a Return
+	result            *frontend.Result
+	err               error
+	exporterAttr      map[string][]byte
+	workers           frontend.WorkerInfos
+	isErrServerClosed bool
 	*pipe
 }
 

vendor/github.com/moby/buildkit/frontend/gateway/grpcclient/client.go

@@ -28,6 +28,8 @@ type GrpcClient interface {
 }
 
 func New(ctx context.Context, opts map[string]string, session, product string, c pb.LLBBridgeClient, w []client.WorkerInfo) (GrpcClient, error) {
+	ctx, cancel := context.WithTimeout(ctx, 5*time.Second)
+	defer cancel()
 	resp, err := c.Ping(ctx, &pb.PingRequest{})
 	if err != nil {
 		return nil, err

vendor/github.com/moby/buildkit/session/grpchijack/dial.go

@@ -46,6 +46,7 @@ type conn struct {
 
 	closedOnce sync.Once
 	readMu     sync.Mutex
+	writeMu    sync.Mutex
 	err        error
 	closeCh    chan struct{}
 }
@@ -79,6 +80,8 @@ func (c *conn) Read(b []byte) (n int, err error) {
 }
 
 func (c *conn) Write(b []byte) (int, error) {
+	c.writeMu.Lock()
+	defer c.writeMu.Unlock()
 	m := &controlapi.BytesMessage{Data: b}
 	if err := c.stream.SendMsg(m); err != nil {
 		return 0, err
@@ -93,7 +96,9 @@ func (c *conn) Close() (err error) {
 		}()
 
 		if cs, ok := c.stream.(grpc.ClientStream); ok {
+			c.writeMu.Lock()
 			err = cs.CloseSend()
+			c.writeMu.Unlock()
 			if err != nil {
 				return
 			}
@@ -106,6 +111,7 @@ func (c *conn) Close() (err error) {
 			err = c.stream.RecvMsg(m)
 			if err != nil {
 				if err != io.EOF {
+					c.readMu.Unlock()
 					return
 				}
 				err = nil

vendor/github.com/moby/buildkit/session/manager.go

@@ -162,7 +162,9 @@ func (sm *Manager) Get(ctx context.Context, id string) (Caller, error) {
 	go func() {
 		select {
 		case <-ctx.Done():
+			sm.mu.Lock()
 			sm.updateCondition.Broadcast()
+			sm.mu.Unlock()
 		}
 	}()
 

vendor/github.com/moby/buildkit/solver/jobs.go

@@ -404,7 +404,9 @@ func (jl *Solver) Get(id string) (*Job, error) {
 
 	go func() {
 		<-ctx.Done()
+		jl.mu.Lock()
 		jl.updateCond.Broadcast()
+		jl.mu.Unlock()
 	}()
 
 	jl.mu.RLock()

vendor/github.com/moby/buildkit/util/progress/progress.go

@@ -101,7 +101,9 @@ func (pr *progressReader) Read(ctx context.Context) ([]*Progress, error) {
 		select {
 		case <-done:
 		case <-ctx.Done():
+			pr.mu.Lock()
 			pr.cond.Broadcast()
+			pr.mu.Unlock()
 		}
 	}()
 	pr.mu.Lock()
@@ -163,7 +165,9 @@ func pipe() (*progressReader, *progressWriter, func()) {
 	pr.cond = sync.NewCond(&pr.mu)
 	go func() {
 		<-ctx.Done()
+		pr.mu.Lock()
 		pr.cond.Broadcast()
+		pr.mu.Unlock()
 	}()
 	pw := &progressWriter{
 		reader: pr,