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