Add capabilities for copy include/exclude patterns

Signed-off-by: Aaron Lehmann <alehmann@netflix.com>

client/llb/fileop.go

@@ -56,6 +56,10 @@ type subAction interface {
 	toProtoAction(context.Context, string, pb.InputIndex) (pb.IsFileAction, error)
 }
 
+type capAdder interface {
+	addCaps(*FileOp)
+}
+
 type FileAction struct {
 	state  *State
 	prev   *FileAction
@@ -500,6 +504,15 @@ func (a *fileActionCopy) sourcePath(ctx context.Context) (string, error) {
 	return p, nil
 }
 
+func (a *fileActionCopy) addCaps(f *FileOp) {
+	if len(a.info.IncludePatterns) != 0 {
+		addCap(&f.constraints, pb.CapFileCopyIncludePatterns)
+	}
+	if len(a.info.ExcludePatterns) != 0 {
+		addCap(&f.constraints, pb.CapFileCopyExcludePatterns)
+	}
+}
+
 type CreatedTime time.Time
 
 func WithCreatedTime(t time.Time) CreatedTime {
@@ -686,6 +699,10 @@ func (f *FileOp) Marshal(ctx context.Context, c *Constraints) (digest.Digest, []
 	pop.Inputs = state.inputs
 
 	for i, st := range state.actions {
+		if adder, isCapAdder := st.action.(capAdder); isCapAdder {
+			adder.addCaps(f)
+		}
+
 		output := pb.OutputIndex(-1)
 		if i+1 == len(state.actions) {
 			output = 0

solver/pb/caps.go

@@ -50,8 +50,10 @@ const (
 
 	CapExecMetaSecurityDeviceWhitelistV1 apicaps.CapID = "exec.meta.security.devices.v1"
 
-	CapFileBase       apicaps.CapID = "file.base"
-	CapFileRmWildcard apicaps.CapID = "file.rm.wildcard"
+	CapFileBase                apicaps.CapID = "file.base"
+	CapFileRmWildcard          apicaps.CapID = "file.rm.wildcard"
+	CapFileCopyIncludePatterns apicaps.CapID = "file.copy.includepatterns"
+	CapFileCopyExcludePatterns apicaps.CapID = "file.copy.excludepatterns"
 
 	CapConstraints apicaps.CapID = "constraints"
 	CapPlatform    apicaps.CapID = "platform"
@@ -288,6 +290,18 @@ func init() {
 		Status:  apicaps.CapStatusExperimental,
 	})
 
+	Caps.Init(apicaps.Cap{
+		ID:      CapFileCopyIncludePatterns,
+		Enabled: true,
+		Status:  apicaps.CapStatusExperimental,
+	})
+
+	Caps.Init(apicaps.Cap{
+		ID:      CapFileCopyExcludePatterns,
+		Enabled: true,
+		Status:  apicaps.CapStatusExperimental,
+	})
+
 	Caps.Init(apicaps.Cap{
 		ID:      CapConstraints,
 		Enabled: true,