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// 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/archive"
"github.com/docker/docker/pkg/fileutils"
)
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 .dockerfileignore: '%s', error: %w", 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("cannot stat %q: %w", filePath, err)
}
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 {
return fmt.Errorf("cannot open %q for reading: %w", filePath, err)
}
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: %w", err)
}
excludes = strings.Split(string(ignore), "\n")
return excludes, nil
}
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