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util.go
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package libbuildpack
import (
"archive/tar"
"archive/zip"
"compress/gzip"
"crypto/sha256"
"encoding/hex"
"errors"
"fmt"
"io"
"math/rand"
"net/http"
"net/url"
"os"
"os/exec"
"path/filepath"
"strings"
"time"
backoff "github.com/cenkalti/backoff/v4"
)
func MoveDirectory(srcDir, destDir string) error {
destExists, _ := FileExists(destDir)
if !destExists {
return os.Rename(srcDir, destDir)
}
files, err := os.ReadDir(srcDir)
if err != nil {
return err
}
for _, f := range files {
src := filepath.Join(srcDir, f.Name())
dest := filepath.Join(destDir, f.Name())
if exists, err := FileExists(dest); err != nil {
return err
} else if !exists {
if m := f.Type(); m&os.ModeSymlink != 0 {
if err = moveSymlinks(src, dest); err != nil {
return err
}
}
if err = os.Rename(src, dest); err != nil {
return err
}
} else {
if f.IsDir() {
if err = MoveDirectory(src, dest); err != nil {
return err
}
}
}
}
return nil
}
// CopyDirectory copies srcDir to destDir
func CopyDirectory(srcDir, destDir string) error {
destExists, _ := FileExists(destDir)
if !destExists {
return errors.New("destination dir must exist")
}
files, err := os.ReadDir(srcDir)
if err != nil {
return err
}
for _, f := range files {
src := filepath.Join(srcDir, f.Name())
dest := filepath.Join(destDir, f.Name())
if m := f.Type(); m&os.ModeSymlink != 0 {
if err = moveSymlinks(src, dest); err != nil {
return err
}
} else if f.IsDir() {
fi, err := f.Info()
if err != nil {
return err
}
err = os.MkdirAll(dest, fi.Mode())
if err != nil {
return err
}
if err := CopyDirectory(src, dest); err != nil {
return err
}
} else {
rc, err := os.Open(src)
if err != nil {
return err
}
fi, err := f.Info()
if err != nil {
rc.Close()
return err
}
err = writeToFile(rc, dest, fi.Mode())
if err != nil {
rc.Close()
return err
}
rc.Close()
}
}
return nil
}
func moveSymlinks(src, dest string) error {
target, err := os.Readlink(src)
if err != nil {
return fmt.Errorf("Error while reading symlink '%s': %v", src, err)
}
if err := os.Symlink(target, dest); err != nil {
return fmt.Errorf("Error while creating '%s' as symlink to '%s': %v", dest, target, err)
}
return nil
}
// ExtractZip extracts zipfile to destDir
func ExtractZip(zipfile, destDir string) error {
r, err := zip.OpenReader(zipfile)
if err != nil {
return err
}
defer r.Close()
for _, f := range r.File {
path := filepath.Join(destDir, filepath.Clean(f.Name))
rc, err := f.Open()
if err != nil {
return err
}
if f.FileInfo().IsDir() {
err = os.MkdirAll(path, f.Mode())
} else {
err = writeToFile(rc, path, f.Mode())
}
rc.Close()
if err != nil {
return err
}
}
return nil
}
// ExtractZipWithStrip extracts zipfile to destDir, optionally stripping N leading path components
// stripComponents works like tar's --strip-components flag:
//
// 0 = extract as-is (default)
// 1 = remove top-level directory
// 2 = remove two levels, etc.
func ExtractZipWithStrip(zipfile, destDir string, stripComponents int) error {
r, err := zip.OpenReader(zipfile)
if err != nil {
return err
}
defer r.Close()
for _, f := range r.File {
// Strip leading path components
name := filepath.Clean(f.Name)
if stripComponents > 0 {
parts := strings.Split(name, string(filepath.Separator))
if len(parts) <= stripComponents {
// Skip files/dirs that would be completely stripped away
continue
}
name = filepath.Join(parts[stripComponents:]...)
}
path := filepath.Join(destDir, name)
rc, err := f.Open()
if err != nil {
return err
}
if f.FileInfo().IsDir() {
err = os.MkdirAll(path, f.Mode())
} else {
err = writeToFile(rc, path, f.Mode())
}
rc.Close()
if err != nil {
return err
}
}
return nil
}
func ExtractTarXz(tarfile, destDir string) error {
file, err := os.Open(tarfile)
if err != nil {
return err
}
defer file.Close()
xz := xzReader(file)
defer xz.Close()
return extractTar(xz, destDir)
}
// ExtractTarXzWithStrip extracts tar.xz to destDir, optionally stripping N leading path components
// stripComponents works like tar's --strip-components flag:
//
// 0 = extract as-is (default)
// 1 = remove top-level directory
// 2 = remove two levels, etc.
func ExtractTarXzWithStrip(tarfile, destDir string, stripComponents int) error {
file, err := os.Open(tarfile)
if err != nil {
return err
}
defer file.Close()
xz := xzReader(file)
defer xz.Close()
return extractTarWithStrip(xz, destDir, stripComponents)
}
func xzReader(r io.Reader) io.ReadCloser {
rpipe, wpipe := io.Pipe()
cmd := exec.Command("xz", "--decompress", "--stdout")
cmd.Stdin = r
cmd.Stdout = wpipe
go func() {
err := cmd.Run()
wpipe.CloseWithError(err)
}()
return rpipe
}
// Gets the buildpack directory
func GetBuildpackDir() (string, error) {
var err error
bpDir := os.Getenv("BUILDPACK_DIR")
if bpDir == "" {
bpDir, err = filepath.Abs(filepath.Join(filepath.Dir(os.Args[0]), ".."))
if err != nil {
return "", err
}
}
return bpDir, nil
}
// ExtractTarGz extracts tar.gz to destDir
func ExtractTarGz(tarfile, destDir string) error {
file, err := os.Open(tarfile)
if err != nil {
return err
}
defer file.Close()
gz, err := gzip.NewReader(file)
if err != nil {
return err
}
defer gz.Close()
return extractTar(gz, destDir)
}
// ExtractTarGzWithStrip extracts tar.gz to destDir, optionally stripping N leading path components
// stripComponents works like tar's --strip-components flag:
//
// 0 = extract as-is (default)
// 1 = remove top-level directory
// 2 = remove two levels, etc.
func ExtractTarGzWithStrip(tarfile, destDir string, stripComponents int) error {
file, err := os.Open(tarfile)
if err != nil {
return err
}
defer file.Close()
gz, err := gzip.NewReader(file)
if err != nil {
return err
}
defer gz.Close()
return extractTarWithStrip(gz, destDir, stripComponents)
}
// CopyFile copies source file to destFile, creating all intermediate directories in destFile
func CopyFile(source, destFile string) error {
fh, err := os.Open(source)
if err != nil {
return err
}
fileInfo, err := fh.Stat()
if err != nil {
return err
}
defer fh.Close()
return writeToFile(fh, destFile, fileInfo.Mode())
}
func FileExists(file string) (bool, error) {
_, err := os.Stat(file)
if err != nil {
if os.IsNotExist(err) {
return false, nil
}
return false, err
}
return true, nil
}
func RandString(n int) string {
letterRunes := []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
b := make([]rune, n)
for i := range b {
b[i] = letterRunes[rand.Intn(len(letterRunes))]
}
return string(b)
}
func extractTar(src io.Reader, destDir string) error {
tr := tar.NewReader(src)
for {
hdr, err := tr.Next()
if err == io.EOF {
break
}
path := filepath.Join(destDir, cleanPath(hdr.Name))
fi := hdr.FileInfo()
if fi.IsDir() {
if err := os.MkdirAll(path, hdr.FileInfo().Mode()); err != nil {
return err
}
} else if hdr.Typeflag == tar.TypeSymlink {
if err := os.MkdirAll(filepath.Dir(path), 0755); err != nil {
return err
}
if filepath.IsAbs(hdr.Linkname) {
return fmt.Errorf("cannot link to an absolute path when extracting archives")
}
fullLink, err := filepath.Abs(filepath.Join(filepath.Dir(path), hdr.Linkname))
if err != nil {
return err
}
fullDest, err := filepath.Abs(destDir)
if err != nil {
return err
}
// check that the relative link does not escape the destination dir
if !strings.HasPrefix(fullLink, fullDest) {
return fmt.Errorf("cannot link outside of the destination diretory when extracting archives")
}
if err = os.Symlink(hdr.Linkname, path); err != nil {
return err
}
} else if hdr.Typeflag == tar.TypeLink {
originalPath := filepath.Join(destDir, cleanPath(hdr.Linkname))
file, err := os.Open(originalPath)
if err != nil {
return err
}
if err := writeToFile(file, path, hdr.FileInfo().Mode()); err != nil {
return err
}
} else {
if err := writeToFile(tr, path, hdr.FileInfo().Mode()); err != nil {
return err
}
}
}
return nil
}
func extractTarWithStrip(src io.Reader, destDir string, stripComponents int) error {
tr := tar.NewReader(src)
for {
hdr, err := tr.Next()
if err == io.EOF {
break
}
// Strip leading path components
name := cleanPath(hdr.Name)
if stripComponents > 0 {
parts := strings.Split(name, string(filepath.Separator))
if len(parts) <= stripComponents {
// Skip files/dirs that would be completely stripped away
continue
}
name = filepath.Join(parts[stripComponents:]...)
}
path := filepath.Join(destDir, name)
fi := hdr.FileInfo()
if fi.IsDir() {
if err := os.MkdirAll(path, hdr.FileInfo().Mode()); err != nil {
return err
}
} else if hdr.Typeflag == tar.TypeSymlink {
if err := os.MkdirAll(filepath.Dir(path), 0755); err != nil {
return err
}
if filepath.IsAbs(hdr.Linkname) {
return fmt.Errorf("cannot link to an absolute path when extracting archives")
}
fullLink, err := filepath.Abs(filepath.Join(filepath.Dir(path), hdr.Linkname))
if err != nil {
return err
}
fullDest, err := filepath.Abs(destDir)
if err != nil {
return err
}
// check that the relative link does not escape the destination dir
if !strings.HasPrefix(fullLink, fullDest) {
return fmt.Errorf("cannot link outside of the destination diretory when extracting archives")
}
if err = os.Symlink(hdr.Linkname, path); err != nil {
return err
}
} else if hdr.Typeflag == tar.TypeLink {
// For hard links, also strip the link target path
linkname := cleanPath(hdr.Linkname)
if stripComponents > 0 {
parts := strings.Split(linkname, string(filepath.Separator))
if len(parts) <= stripComponents {
// Skip if link target would be stripped away
continue
}
linkname = filepath.Join(parts[stripComponents:]...)
}
originalPath := filepath.Join(destDir, linkname)
file, err := os.Open(originalPath)
if err != nil {
return err
}
if err := writeToFile(file, path, hdr.FileInfo().Mode()); err != nil {
return err
}
} else {
if err := writeToFile(tr, path, hdr.FileInfo().Mode()); err != nil {
return err
}
}
}
return nil
}
func filterURI(rawURL string) (string, error) {
unsafeURL, err := url.Parse(rawURL)
if err != nil {
return "", err
}
var safeURL string
if unsafeURL.User == nil {
safeURL = rawURL
return safeURL, nil
}
redactedUserInfo := url.UserPassword("-redacted-", "-redacted-")
unsafeURL.User = redactedUserInfo
safeURL = unsafeURL.String()
return safeURL, nil
}
func CheckSha256(filePath, expectedSha256 string) error {
content, err := os.ReadFile(filePath)
if err != nil {
return err
}
sum := sha256.Sum256(content)
actualSha256 := hex.EncodeToString(sum[:])
if actualSha256 != expectedSha256 {
return fmt.Errorf("dependency sha256 mismatch: expected sha256 %s, actual sha256 %s", expectedSha256, actualSha256)
}
return nil
}
func downloadFile(url string, destFile string, retryTimeLimit time.Duration, retryTimeInitialInterval time.Duration, logger *Logger) error {
bo := backoff.NewExponentialBackOff()
bo.MaxElapsedTime = retryTimeLimit
bo.InitialInterval = retryTimeInitialInterval
var resp *http.Response
var err error
operation := func() error {
resp, err = http.Get(url)
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode >= 400 {
return fmt.Errorf("%s", resp.Status)
}
return writeToFile(resp.Body, destFile, 0666)
}
notify := func(err error, duration time.Duration) {
logger.Info("error: %v, retrying in %v...", err, duration)
}
err = backoff.RetryNotify(operation, bo, notify)
if err != nil {
return fmt.Errorf("could not download: %s", err)
}
return nil
}
func writeToFile(source io.Reader, destFile string, mode os.FileMode) error {
err := os.MkdirAll(filepath.Dir(destFile), 0755)
if err != nil {
return err
}
fh, err := os.OpenFile(destFile, os.O_RDWR|os.O_CREATE|os.O_TRUNC, mode)
if err != nil {
return err
}
defer fh.Close()
_, err = io.Copy(fh, source)
if err != nil {
return err
}
return nil
}
func cleanPath(path string) string {
if path == "" {
return ""
}
path = filepath.Clean(path)
if !filepath.IsAbs(path) {
path = filepath.Clean(string(os.PathSeparator) + path)
path, _ = filepath.Rel(string(os.PathSeparator), path)
}
return filepath.Clean(path)
}