Merge pull request #901 from tonistiigi/dockerfile-ignore

dockerfile: add dockerignore override support

frontend/dockerfile/builder/build.go

@@ -113,7 +113,7 @@ func Build(ctx context.Context, c client.Client) (*client.Result, error) {
 	name := "load build definition from " + filename
 
 	src := llb.Local(localNameDockerfile,
-		llb.FollowPaths([]string{filename}),
+		llb.FollowPaths([]string{filename, filename + ".dockerignore"}),
 		llb.SessionID(c.BuildOpts().SessionID),
 		llb.SharedKeyHint(localNameDockerfile),
 		dockerfile2llb.WithInternalName(name),
@@ -175,6 +175,8 @@ func Build(ctx context.Context, c client.Client) (*client.Result, error) {
 
 	eg, ctx2 := errgroup.WithContext(ctx)
 	var dtDockerfile []byte
+	var dtDockerignore []byte
+	var dtDockerignoreDefault []byte
 	eg.Go(func() error {
 		res, err := c.Solve(ctx2, client.SolveRequest{
 			Definition: def.ToPB(),
@@ -194,6 +196,13 @@ func Build(ctx context.Context, c client.Client) (*client.Result, error) {
 		if err != nil {
 			return errors.Wrapf(err, "failed to read dockerfile")
 		}
+
+		dt, err := ref.ReadFile(ctx2, client.ReadRequest{
+			Filename: filename + ".dockerignore",
+		})
+		if err == nil {
+			dtDockerignore = dt
+		}
 		return nil
 	})
 	var excludes []string
@@ -223,14 +232,11 @@ func Build(ctx context.Context, c client.Client) (*client.Result, error) {
 			if err != nil {
 				return err
 			}
-			dtDockerignore, err := ref.ReadFile(ctx2, client.ReadRequest{
+			dtDockerignoreDefault, err = ref.ReadFile(ctx2, client.ReadRequest{
 				Filename: dockerignoreFilename,
 			})
-			if err == nil {
-				excludes, err = dockerignore.ReadAll(bytes.NewBuffer(dtDockerignore))
 			if err != nil {
-					return errors.Wrap(err, "failed to parse dockerignore")
-				}
+				return nil
 			}
 			return nil
 		})
@@ -240,6 +246,16 @@ func Build(ctx context.Context, c client.Client) (*client.Result, error) {
 		return nil, err
 	}
 
+	if dtDockerignore == nil {
+		dtDockerignore = dtDockerignoreDefault
+	}
+	if dtDockerignore != nil {
+		excludes, err = dockerignore.ReadAll(bytes.NewBuffer(dtDockerignore))
+		if err != nil {
+			return nil, errors.Wrap(err, "failed to parse dockerignore")
+		}
+	}
+
 	if _, ok := opts["cmdline"]; !ok {
 		ref, cmdline, ok := dockerfile2llb.DetectSyntax(bytes.NewBuffer(dtDockerfile))
 		if ok {

frontend/dockerfile/dockerfile_test.go

@@ -78,6 +78,7 @@ var allTests = []integration.Test{
 	testDockerfileAddArchiveWildcard,
 	testCopyChownExistingDir,
 	testCopyWildcardCache,
+	testDockerignoreOverride,
 }
 
 var fileOpTests = []integration.Test{
@@ -138,6 +139,63 @@ func TestIntegration(t *testing.T) {
 	}))...)
 }
 
+func testDockerignoreOverride(t *testing.T, sb integration.Sandbox) {
+	f := getFrontend(t, sb)
+	dockerfile := []byte(`
+FROM busybox
+COPY . .
+RUN [ -f foo ] && [ ! -f bar ]
+`)
+
+	ignore := []byte(`
+bar
+`)
+
+	dockerfile2 := []byte(`
+FROM busybox
+COPY . .
+RUN [ ! -f foo ] && [ -f bar ]
+`)
+
+	ignore2 := []byte(`
+foo
+`)
+
+	dir, err := tmpdir(
+		fstest.CreateFile("Dockerfile", dockerfile, 0600),
+		fstest.CreateFile("Dockerfile.dockerignore", ignore, 0600),
+		fstest.CreateFile("Dockerfile2", dockerfile2, 0600),
+		fstest.CreateFile("Dockerfile2.dockerignore", ignore2, 0600),
+		fstest.CreateFile("foo", []byte("contents0"), 0600),
+		fstest.CreateFile("bar", []byte("contents0"), 0600),
+	)
+	require.NoError(t, err)
+	defer os.RemoveAll(dir)
+
+	c, err := client.New(context.TODO(), sb.Address())
+	require.NoError(t, err)
+	defer c.Close()
+
+	_, err = f.Solve(context.TODO(), c, client.SolveOpt{
+		LocalDirs: map[string]string{
+			builder.DefaultLocalNameDockerfile: dir,
+			builder.DefaultLocalNameContext:    dir,
+		},
+	}, nil)
+	require.NoError(t, err)
+
+	_, err = f.Solve(context.TODO(), c, client.SolveOpt{
+		FrontendAttrs: map[string]string{
+			"filename": "Dockerfile2",
+		},
+		LocalDirs: map[string]string{
+			builder.DefaultLocalNameDockerfile: dir,
+			builder.DefaultLocalNameContext:    dir,
+		},
+	}, nil)
+	require.NoError(t, err)
+}
+
 func testEmptyDestDir(t *testing.T, sb integration.Sandbox) {
 	f := getFrontend(t, sb)
 	isFileOp := getFileOp(t, sb)