vendor: github.com/moby/buildkit v0.8.2

full diff: 68bb095353...9065b18ba4

- fix seccomp compatibility in 32bit arm
    - fixes Unable to build alpine:edge containers for armv7
    - fixes Buildx failing to build for arm/v7 platform on arm64 machine
- resolver: avoid error caching on token fetch
    - fixes "Error: i/o timeout should not be cached"
- fileop: fix checksum to contain indexes of inputs
- frontend/dockerfile: add RunCommand.FlagsUsed field
    - relates to [20.10] Classic builder silently ignores unsupported Dockerfile command flags
- update qemu emulators
    - relates to "Impossible to run git clone inside buildx with non x86 architecture"
- Fix reference count issues on typed errors with mount references
    - fixes errors on releasing mounts with typed execerror refs
    - fixes / addresses invalid mutable ref when using shared cache mounts
- dockerfile/docs: fix frontend image tags
- git: set token only for main remote access
    - fixes "Loading repositories with submodules is repeated. Failed to clone submodule from googlesource"
- allow skipping empty layer detection on cache export

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Signed-off-by: Tibor Vass <tibor@docker.com>

vendor.conf

@@ -33,7 +33,7 @@ github.com/imdario/mergo                            1afb36080aec31e0d1528973ebe6
 golang.org/x/sync                                   cd5d95a43a6e21273425c7ae415d3df9ea832eeb
 
 # buildkit
-github.com/moby/buildkit                            68bb095353c65bc3993fd534c26cf77fe05e61b1 # v0.8 branch
+github.com/moby/buildkit                            9065b18ba4633c75862befca8188de4338d9f94a # v0.8.2
 github.com/tonistiigi/fsutil                        0834f99b7b85462efb69b4f571a4fa3ca7da5ac9
 github.com/tonistiigi/units                         6950e57a87eaf136bbe44ef2ec8e75b9e3569de2
 github.com/grpc-ecosystem/grpc-opentracing          8e809c8a86450a29b90dcc9efbf062d0fe6d9746

vendor/github.com/moby/buildkit/cache/remotecache/v1/utils.go

@@ -10,6 +10,10 @@ import (
 	"github.com/pkg/errors"
 )
 
+// EmptyLayerRemovalSupported defines if implementation supports removal of empty layers. Buildkit image exporter
+// removes empty layers, but moby layerstore based implementation does not.
+var EmptyLayerRemovalSupported = true
+
 // sortConfig sorts the config structure to make sure it is deterministic
 func sortConfig(cc *CacheConfig) {
 	type indexedLayer struct {
@@ -239,7 +243,7 @@ func marshalRemote(r *solver.Remote, state *marshalState) string {
 	}
 	desc := r.Descriptors[len(r.Descriptors)-1]
 
-	if desc.Digest == exptypes.EmptyGZLayer {
+	if desc.Digest == exptypes.EmptyGZLayer && EmptyLayerRemovalSupported {
 		return parentID
 	}
 

vendor/github.com/moby/buildkit/frontend/dockerfile/instructions/bflag.go

@@ -108,6 +108,15 @@ func (fl *Flag) IsUsed() bool {
 	return false
 }
 
+// Used returns a slice of flag names that are set
+func (bf *BFlags) Used() []string {
+	used := make([]string, 0, len(bf.used))
+	for f := range bf.used {
+		used = append(used, f)
+	}
+	return used
+}
+
 // IsTrue checks if a bool flag is true
 func (fl *Flag) IsTrue() bool {
 	if fl.flagType != boolType {

vendor/github.com/moby/buildkit/frontend/dockerfile/instructions/commands.go

@@ -269,6 +269,7 @@ type RunCommand struct {
 	withNameAndCode
 	withExternalData
 	ShellDependantCmdLine
+	FlagsUsed []string
 }
 
 // CmdCommand : CMD foo

vendor/github.com/moby/buildkit/frontend/dockerfile/instructions/parse.go

@@ -375,7 +375,7 @@ func parseRun(req parseRequest) (*RunCommand, error) {
 	if err := req.flags.Parse(); err != nil {
 		return nil, err
 	}
-
+	cmd.FlagsUsed = req.flags.Used()
 	cmd.ShellDependantCmdLine = parseShellDependentCommand(req, false)
 	cmd.withNameAndCode = newWithNameAndCode(req)
 

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

@@ -127,6 +127,7 @@ type MountRef struct {
 type MountMutableRef struct {
 	Ref        cache.MutableRef
 	MountIndex int
+	NoCommit   bool
 }
 
 type MakeMutable func(m *opspb.Mount, ref cache.ImmutableRef) (cache.MutableRef, error)
@@ -196,6 +197,7 @@ func PrepareMounts(ctx context.Context, mm *mounts.MountManager, cm cache.Manage
 			p.Actives = append(p.Actives, MountMutableRef{
 				MountIndex: i,
 				Ref:        active,
+				NoCommit:   true,
 			})
 			if m.Output != opspb.SkipOutput && ref != nil {
 				p.OutputRefs = append(p.OutputRefs, MountRef{

vendor/github.com/moby/buildkit/solver/llbsolver/errdefs/exec.go

@@ -21,10 +21,15 @@ func (e *ExecError) Unwrap() error {
 }
 
 func (e *ExecError) EachRef(fn func(solver.Result) error) (err error) {
+	m := map[solver.Result]struct{}{}
 	for _, res := range e.Inputs {
 		if res == nil {
 			continue
 		}
+		if _, ok := m[res]; ok {
+			continue
+		}
+		m[res] = struct{}{}
 		if err1 := fn(res); err1 != nil && err == nil {
 			err = err1
 		}
@@ -33,6 +38,10 @@ func (e *ExecError) EachRef(fn func(solver.Result) error) (err error) {
 		if res == nil {
 			continue
 		}
+		if _, ok := m[res]; ok {
+			continue
+		}
+		m[res] = struct{}{}
 		if err1 := fn(res); err1 != nil && err == nil {
 			err = err1
 		}

vendor/github.com/moby/buildkit/solver/llbsolver/ops/exec.go

@@ -235,7 +235,7 @@ func (e *execOp) Exec(ctx context.Context, g session.Group, inputs []solver.Resu
 				if m.Input == -1 {
 					continue
 				}
-				execInputs[i] = inputs[m.Input]
+				execInputs[i] = inputs[m.Input].Clone()
 			}
 			execMounts := make([]solver.Result, len(e.op.Mounts))
 			copy(execMounts, execInputs)
@@ -243,6 +243,9 @@ func (e *execOp) Exec(ctx context.Context, g session.Group, inputs []solver.Resu
 				execMounts[p.OutputRefs[i].MountIndex] = res
 			}
 			for _, active := range p.Actives {
+				if active.NoCommit {
+					active.Ref.Release(context.TODO())
+				} else {
 					ref, cerr := active.Ref.Commit(ctx)
 					if cerr != nil {
 						err = errors.Wrapf(err, "error committing %s: %s", active.Ref.ID(), cerr)
@@ -250,6 +253,7 @@ func (e *execOp) Exec(ctx context.Context, g session.Group, inputs []solver.Resu
 					}
 					execMounts[active.MountIndex] = worker.NewWorkerRefResult(ref, e.w)
 				}
+			}
 			err = errdefs.WithExecError(err, execInputs, execMounts)
 		} else {
 			// Only release actives if err is nil.

vendor/github.com/moby/buildkit/solver/llbsolver/ops/exec_binfmt.go

@@ -27,6 +27,7 @@ var qemuArchMap = map[string]string{
 	"arm":     "arm",
 	"s390x":   "s390x",
 	"ppc64le": "ppc64le",
+	"386":     "i386",
 }
 
 type emulator struct {

vendor/github.com/moby/buildkit/solver/llbsolver/ops/file.go

@@ -61,6 +61,8 @@ func (f *fileOp) CacheMap(ctx context.Context, g session.Group, index int) (*sol
 		}
 	}
 
+	indexes := make([][]int, 0, len(f.op.Actions))
+
 	for _, action := range f.op.Actions {
 		var dt []byte
 		var err error
@@ -103,14 +105,21 @@ func (f *fileOp) CacheMap(ctx context.Context, g session.Group, index int) (*sol
 		}
 
 		actions = append(actions, dt)
+		indexes = append(indexes, []int{int(action.Input), int(action.SecondaryInput), int(action.Output)})
+	}
+
+	if isDefaultIndexes(indexes) {
+		indexes = nil
 	}
 
 	dt, err := json.Marshal(struct {
 		Type    string
 		Actions [][]byte
+		Indexes [][]int `json:"indexes,omitempty"`
 	}{
 		Type:    fileCacheType,
 		Actions: actions,
+		Indexes: indexes,
 	})
 	if err != nil {
 		return nil, false, err
@@ -421,7 +430,6 @@ func (s *FileOpSolver) getInput(ctx context.Context, idx int, inputs []fileoptyp
 					if cerr == nil {
 						outputRes[idx-len(inputs)] = worker.NewWorkerRefResult(ref.(cache.ImmutableRef), s.w)
 					}
-					inpMount.Release(context.TODO())
 				}
 
 				// If the action has a secondary input, commit it and set the ref on
@@ -611,3 +619,39 @@ func (s *FileOpSolver) getInput(ctx context.Context, idx int, inputs []fileoptyp
 	}
 	return inp.(input), err
 }
+
+func isDefaultIndexes(idxs [][]int) bool {
+	// Older version of checksum did not contain indexes for actions resulting in possibility for a wrong cache match.
+	// We detect the most common pattern for indexes and maintain old checksum for that case to minimize cache misses on upgrade.
+	// If a future change causes braking changes in instruction cache consider removing this exception.
+	if len(idxs) == 0 {
+		return false
+	}
+
+	for i, idx := range idxs {
+		if len(idx) != 3 {
+			return false
+		}
+		// input for first action is first input
+		if i == 0 && idx[0] != 0 {
+			return false
+		}
+		// input for other actions is previous action
+		if i != 0 && idx[0] != len(idxs)+(i-1) {
+			return false
+		}
+		// secondary input is second input or -1
+		if idx[1] != -1 && idx[1] != 1 {
+			return false
+		}
+		// last action creates output
+		if i == len(idxs)-1 && idx[2] != 0 {
+			return false
+		}
+		// other actions do not create an output
+		if i != len(idxs)-1 && idx[2] != -1 {
+			return false
+		}
+	}
+	return true
+}

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

@@ -47,7 +47,7 @@ type splitResult struct {
 
 func (r *splitResult) Release(ctx context.Context) error {
 	if atomic.AddInt64(&r.released, 1) > 1 {
-		err := errors.Errorf("releasing already released reference")
+		err := errors.Errorf("releasing already released reference %+v", r.Result.ID())
 		logrus.Error(err)
 		return err
 	}
@@ -78,10 +78,14 @@ func NewSharedCachedResult(res CachedResult) *SharedCachedResult {
 	}
 }
 
-func (r *SharedCachedResult) Clone() CachedResult {
+func (r *SharedCachedResult) CloneCachedResult() CachedResult {
 	return &clonedCachedResult{Result: r.SharedResult.Clone(), cr: r.CachedResult}
 }
 
+func (r *SharedCachedResult) Clone() Result {
+	return r.CloneCachedResult()
+}
+
 func (r *SharedCachedResult) Release(ctx context.Context) error {
 	return r.SharedResult.Release(ctx)
 }

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

@@ -244,7 +244,7 @@ func (s *scheduler) build(ctx context.Context, edge Edge) (CachedResult, error)
 	if err := p.Receiver.Status().Err; err != nil {
 		return nil, err
 	}
-	return p.Receiver.Status().Value.(*edgeState).result.Clone(), nil
+	return p.Receiver.Status().Value.(*edgeState).result.CloneCachedResult(), nil
 }
 
 // newPipe creates a new request pipe between two edges

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

@@ -61,6 +61,7 @@ type Result interface {
 	ID() string
 	Release(context.Context) error
 	Sys() interface{}
+	Clone() Result
 }
 
 // CachedResult is a result connected with its cache key

vendor/github.com/moby/buildkit/source/git/gitsource.go

@@ -231,7 +231,7 @@ func (gs *gitSourceHandler) getAuthToken(ctx context.Context, g session.Group) e
 			if s.token {
 				dt = []byte("basic " + base64.StdEncoding.EncodeToString([]byte(fmt.Sprintf("x-access-token:%s", dt))))
 			}
-			gs.auth = []string{"-c", "http.extraheader=Authorization: " + string(dt)}
+			gs.auth = []string{"-c", "http." + tokenScope(gs.src.Remote) + ".extraheader=Authorization: " + string(dt)}
 			break
 		}
 		return nil
@@ -631,3 +631,14 @@ func argsNoDepth(args []string) []string {
 	}
 	return out
 }
+
+func tokenScope(remote string) string {
+	// generally we can only use the token for fetching main remote but in case of github.com we do best effort
+	// to try reuse same token for all github.com remotes. This is the same behavior actions/checkout uses
+	for _, pfx := range []string{"https://github.com/", "https://www.github.com/"} {
+		if strings.HasPrefix(remote, pfx) {
+			return pfx
+		}
+	}
+	return remote
+}

vendor/github.com/moby/buildkit/util/resolver/authorizer.go

@@ -220,15 +220,13 @@ func (a *dockerAuthorizer) AddResponses(ctx context.Context, responses []*http.R
 
 // authResult is used to control limit rate.
 type authResult struct {
-	sync.WaitGroup
 	token   string
-	err     error
 	expires time.Time
 }
 
 // authHandler is used to handle auth request per registry server.
 type authHandler struct {
-	sync.Mutex
+	g flightcontrol.Group
 
 	client *http.Client
 
@@ -241,6 +239,7 @@ type authHandler struct {
 	// scopedTokens caches token indexed by scopes, which used in
 	// bearer auth case
 	scopedTokens   map[string]*authResult
+	scopedTokensMu sync.Mutex
 
 	lastUsed time.Time
 
@@ -292,46 +291,44 @@ func (ah *authHandler) doBearerAuth(ctx context.Context, sm *session.Manager, g
 	// Docs: https://docs.docker.com/registry/spec/auth/scope
 	scoped := strings.Join(to.Scopes, " ")
 
-	ah.Lock()
-	for {
+	res, err := ah.g.Do(ctx, scoped, func(ctx context.Context) (interface{}, error) {
+		ah.scopedTokensMu.Lock()
 		r, exist := ah.scopedTokens[scoped]
-		if !exist {
-			// no entry cached
-			break
-		}
-		ah.Unlock()
-		r.Wait()
-		if r.err != nil {
-			select {
-			case <-ctx.Done():
-				return "", r.err
-			default:
+		ah.scopedTokensMu.Unlock()
+		if exist {
+			if r.expires.IsZero() || r.expires.After(time.Now()) {
+				return r, nil
 			}
 		}
-		if !errors.Is(r.err, context.Canceled) &&
-			(r.expires.IsZero() || r.expires.After(time.Now())) {
-			return r.token, r.err
+		r, err := ah.fetchToken(ctx, sm, g, to)
+		if err != nil {
+			return nil, err
 		}
-		// r.err is canceled or token expired. Get rid of it and try again
-		ah.Lock()
-		r2, exist := ah.scopedTokens[scoped]
-		if exist && r == r2 {
-			delete(ah.scopedTokens, scoped)
-		}
-	}
-
-	// only one fetch token job
-	r := new(authResult)
-	r.Add(1)
+		ah.scopedTokensMu.Lock()
 		ah.scopedTokens[scoped] = r
-	ah.Unlock()
+		ah.scopedTokensMu.Unlock()
+		return r, nil
+	})
 
+	if err != nil || res == nil {
+		return "", err
+	}
+	r := res.(*authResult)
+	if r == nil {
+		return "", nil
+	}
+	return r.token, nil
+}
+
+func (ah *authHandler) fetchToken(ctx context.Context, sm *session.Manager, g session.Group, to auth.TokenOptions) (r *authResult, err error) {
 	var issuedAt time.Time
 	var expires int
+	var token string
 	defer func() {
 		token = fmt.Sprintf("Bearer %s", token)
-		r.token, r.err = token, err
+
 		if err == nil {
+			r = &authResult{token: token}
 			if issuedAt.IsZero() {
 				issuedAt = time.Now()
 			}
@@ -339,7 +336,6 @@ func (ah *authHandler) doBearerAuth(ctx context.Context, sm *session.Manager, g
 				r.expires = exp
 			}
 		}
-		r.Done()
 	}()
 
 	if ah.authority != nil {
@@ -351,10 +347,11 @@ func (ah *authHandler) doBearerAuth(ctx context.Context, sm *session.Manager, g
 			Scopes:   to.Scopes,
 		}, sm, g)
 		if err != nil {
-			return "", err
+			return nil, err
 		}
 		issuedAt, expires = time.Unix(resp.IssuedAt, 0), int(resp.ExpiresIn)
-		return resp.Token, nil
+		token = resp.Token
+		return nil, nil
 	}
 
 	// fetch token for the resource scope
@@ -374,29 +371,32 @@ func (ah *authHandler) doBearerAuth(ctx context.Context, sm *session.Manager, g
 				if (errStatus.StatusCode == 405 && to.Username != "") || errStatus.StatusCode == 404 || errStatus.StatusCode == 401 {
 					resp, err := auth.FetchTokenWithOAuth(ctx, ah.client, nil, "buildkit-client", to)
 					if err != nil {
-						return "", err
+						return nil, err
 					}
 					issuedAt, expires = resp.IssuedAt, resp.ExpiresIn
-					return resp.AccessToken, nil
+					token = resp.AccessToken
+					return nil, nil
 				}
 				log.G(ctx).WithFields(logrus.Fields{
 					"status": errStatus.Status,
 					"body":   string(errStatus.Body),
 				}).Debugf("token request failed")
 			}
-			return "", err
+			return nil, err
 		}
 		issuedAt, expires = resp.IssuedAt, resp.ExpiresIn
-		return resp.Token, nil
+		token = resp.Token
+		return nil, nil
 	}
 	// do request anonymously
 	resp, err := auth.FetchToken(ctx, ah.client, nil, to)
 	if err != nil {
-		return "", errors.Wrap(err, "failed to fetch anonymous token")
+		return nil, errors.Wrap(err, "failed to fetch anonymous token")
 	}
 	issuedAt, expires = resp.IssuedAt, resp.ExpiresIn
 
-	return resp.Token, nil
+	token = resp.Token
+	return nil, nil
 }
 
 func invalidAuthorization(c auth.Challenge, responses []*http.Response) error {

vendor/github.com/moby/buildkit/worker/result.go

@@ -52,3 +52,11 @@ func (r *workerRefResult) Release(ctx context.Context) error {
 func (r *workerRefResult) Sys() interface{} {
 	return r.WorkerRef
 }
+
+func (r *workerRefResult) Clone() solver.Result {
+	r2 := *r
+	if r.ImmutableRef != nil {
+		r.ImmutableRef = r.ImmutableRef.Clone()
+	}
+	return &r2
+}