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vendor/github.com/fsouza/go-dockerclient/tar.go

@@ -0,0 +1,122 @@
+// Copyright 2014 go-dockerclient authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package docker
+
+import (
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+	"path"
+	"path/filepath"
+	"strings"
+
+	"github.com/docker/docker/pkg/fileutils"
+	"github.com/fsouza/go-dockerclient/internal/archive"
+)
+
+func createTarStream(srcPath, dockerfilePath string) (io.ReadCloser, error) {
+	srcPath, err := filepath.Abs(srcPath)
+	if err != nil {
+		return nil, err
+	}
+
+	excludes, err := parseDockerignore(srcPath)
+	if err != nil {
+		return nil, err
+	}
+
+	includes := []string{"."}
+
+	// If .dockerignore mentions .dockerignore or the Dockerfile
+	// then make sure we send both files over to the daemon
+	// because Dockerfile is, obviously, needed no matter what, and
+	// .dockerignore is needed to know if either one needs to be
+	// removed.  The deamon will remove them for us, if needed, after it
+	// parses the Dockerfile.
+	//
+	// https://github.com/docker/docker/issues/8330
+	//
+	forceIncludeFiles := []string{".dockerignore", dockerfilePath}
+
+	for _, includeFile := range forceIncludeFiles {
+		if includeFile == "" {
+			continue
+		}
+		keepThem, err := fileutils.Matches(includeFile, excludes)
+		if err != nil {
+			return nil, fmt.Errorf("cannot match .dockerfile: '%s', error: %s", includeFile, err)
+		}
+		if keepThem {
+			includes = append(includes, includeFile)
+		}
+	}
+
+	if err := validateContextDirectory(srcPath, excludes); err != nil {
+		return nil, err
+	}
+	tarOpts := &archive.TarOptions{
+		ExcludePatterns: excludes,
+		IncludeFiles:    includes,
+		Compression:     archive.Uncompressed,
+		NoLchown:        true,
+	}
+	return archive.TarWithOptions(srcPath, tarOpts)
+}
+
+// validateContextDirectory checks if all the contents of the directory
+// can be read and returns an error if some files can't be read.
+// Symlinks which point to non-existing files don't trigger an error
+func validateContextDirectory(srcPath string, excludes []string) error {
+	return filepath.Walk(filepath.Join(srcPath, "."), func(filePath string, f os.FileInfo, err error) error {
+		// skip this directory/file if it's not in the path, it won't get added to the context
+		if relFilePath, relErr := filepath.Rel(srcPath, filePath); relErr != nil {
+			return relErr
+		} else if skip, matchErr := fileutils.Matches(relFilePath, excludes); matchErr != nil {
+			return matchErr
+		} else if skip {
+			if f.IsDir() {
+				return filepath.SkipDir
+			}
+			return nil
+		}
+
+		if err != nil {
+			if os.IsPermission(err) {
+				return fmt.Errorf("can't stat '%s'", filePath)
+			}
+			if os.IsNotExist(err) {
+				return nil
+			}
+			return err
+		}
+
+		// skip checking if symlinks point to non-existing files, such symlinks can be useful
+		// also skip named pipes, because they hanging on open
+		if f.Mode()&(os.ModeSymlink|os.ModeNamedPipe) != 0 {
+			return nil
+		}
+
+		if !f.IsDir() {
+			currentFile, err := os.Open(filePath)
+			if err != nil && os.IsPermission(err) {
+				return fmt.Errorf("no permission to read from '%s'", filePath)
+			}
+			currentFile.Close()
+		}
+		return nil
+	})
+}
+
+func parseDockerignore(root string) ([]string, error) {
+	var excludes []string
+	ignore, err := ioutil.ReadFile(path.Join(root, ".dockerignore"))
+	if err != nil && !os.IsNotExist(err) {
+		return excludes, fmt.Errorf("error reading .dockerignore: '%s'", err)
+	}
+	excludes = strings.Split(string(ignore), "\n")
+
+	return excludes, nil
+}