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replace tar (cli) with code-only packing
Signed-off-by: Alexandr Stefurishin <[email protected]>
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Alexandr Stefurishin
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Dec 12, 2024
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,241 @@ | ||
| /* | ||
| Copyright 2024 The Kubernetes Authors. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
|
||
| package nfs | ||
|
|
||
| import ( | ||
| "archive/tar" | ||
| "compress/gzip" | ||
| "errors" | ||
| "fmt" | ||
| "io" | ||
| "io/fs" | ||
| "os" | ||
| "path" | ||
| "path/filepath" | ||
| "strings" | ||
| ) | ||
|
|
||
| func TarPack(srcDirPath string, dstPath string, enableCompression bool) error { | ||
| // normalize all paths to be absolute and clean | ||
| dstPath, err := filepath.Abs(dstPath) | ||
| if err != nil { | ||
| return fmt.Errorf("normalizing destination path: %w", err) | ||
| } | ||
|
|
||
| srcDirPath, err = filepath.Abs(srcDirPath) | ||
| if err != nil { | ||
| return fmt.Errorf("normalizing source path: %w", err) | ||
| } | ||
|
|
||
| if strings.Index(path.Dir(dstPath), srcDirPath) == 0 { | ||
| return fmt.Errorf("destination file %s cannot be under source directory %s", dstPath, srcDirPath) | ||
| } | ||
|
|
||
| tarFile, err := os.Create(dstPath) | ||
| if err != nil { | ||
| return fmt.Errorf("creating destination file: %w", err) | ||
| } | ||
| defer func() { | ||
| err = errors.Join(err, closeAndWrapErr(tarFile, "closing destination file %s: %w", dstPath)) | ||
| }() | ||
|
|
||
| var tarDst io.Writer = tarFile | ||
| if enableCompression { | ||
| gzipWriter := gzip.NewWriter(tarFile) | ||
| defer func() { | ||
| err = errors.Join(err, closeAndWrapErr(gzipWriter, "closing gzip writer")) | ||
| }() | ||
| tarDst = gzipWriter | ||
| } | ||
|
|
||
| tarWriter := tar.NewWriter(tarDst) | ||
| defer func() { | ||
| err = errors.Join(err, closeAndWrapErr(tarWriter, "closing tar writer")) | ||
| }() | ||
|
|
||
| // recursively visit every file and write it | ||
| if err = filepath.Walk( | ||
| srcDirPath, | ||
| func(srcSubPath string, fileInfo fs.FileInfo, walkErr error) error { | ||
| return tarVisitFileToPack(tarWriter, srcDirPath, srcSubPath, fileInfo, walkErr) | ||
| }, | ||
| ); err != nil { | ||
| return fmt.Errorf("walking source directory: %w", err) | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| func tarVisitFileToPack( | ||
| tarWriter *tar.Writer, | ||
| srcPath string, | ||
| srcSubPath string, | ||
| fileInfo os.FileInfo, | ||
| walkErr error, | ||
| ) (err error) { | ||
| if walkErr != nil { | ||
| return walkErr | ||
| } | ||
|
|
||
| linkTarget := "" | ||
| if fileInfo.Mode()&fs.ModeSymlink != 0 { | ||
| linkTarget, err = os.Readlink(srcSubPath) | ||
| if err != nil { | ||
| return fmt.Errorf("reading link %s: %w", srcSubPath, err) | ||
| } | ||
| } | ||
|
|
||
| tarHeader, err := tar.FileInfoHeader(fileInfo, linkTarget) | ||
| if err != nil { | ||
| return fmt.Errorf("creating tar header for %s: %w", srcSubPath, err) | ||
| } | ||
|
|
||
| // srcSubPath always starts with srcPath and both are absolute | ||
| tarHeader.Name, err = filepath.Rel(srcPath, srcSubPath) | ||
| if err != nil { | ||
| return fmt.Errorf("making tar header name for file %s: %w", srcSubPath, err) | ||
| } | ||
|
|
||
| if err = tarWriter.WriteHeader(tarHeader); err != nil { | ||
| return fmt.Errorf("writing tar header for file %s: %w", srcSubPath, err) | ||
| } | ||
|
|
||
| if !fileInfo.Mode().IsRegular() { | ||
| return nil | ||
| } | ||
|
|
||
| srcFile, err := os.Open(srcSubPath) | ||
| if err != nil { | ||
| return fmt.Errorf("opening file being packed %s: %w", srcSubPath, err) | ||
| } | ||
| defer func() { | ||
| err = errors.Join(err, closeAndWrapErr(srcFile, "closing file being packed %s: %w", srcSubPath)) | ||
| }() | ||
| _, err = io.Copy(tarWriter, srcFile) | ||
| if err != nil { | ||
| return fmt.Errorf("packing file %s: %w", srcSubPath, err) | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func TarUnpack(srcPath, dstDirPath string, enableCompression bool) (err error) { | ||
| // normalize all paths to be absolute and clean | ||
| srcPath, err = filepath.Abs(srcPath) | ||
| if err != nil { | ||
| return fmt.Errorf("normalizing archive path: %w", err) | ||
| } | ||
|
|
||
| dstDirPath, err = filepath.Abs(dstDirPath) | ||
| if err != nil { | ||
| return fmt.Errorf("normalizing archive destination path: %w", err) | ||
| } | ||
|
|
||
| tarFile, err := os.Open(srcPath) | ||
| if err != nil { | ||
| return fmt.Errorf("opening archive %s: %w", srcPath, err) | ||
| } | ||
| defer func() { | ||
| err = errors.Join(err, closeAndWrapErr(tarFile, "closing archive %s: %w", srcPath)) | ||
| }() | ||
|
|
||
| var tarDst io.Reader = tarFile | ||
| if enableCompression { | ||
| var gzipReader *gzip.Reader | ||
| gzipReader, err = gzip.NewReader(tarFile) | ||
| if err != nil { | ||
| return fmt.Errorf("creating gzip reader: %w", err) | ||
| } | ||
| defer func() { | ||
| err = errors.Join(err, closeAndWrapErr(gzipReader, "closing gzip reader: %w")) | ||
| }() | ||
|
|
||
| tarDst = gzipReader | ||
| } | ||
|
|
||
| tarReader := tar.NewReader(tarDst) | ||
|
|
||
| for { | ||
| var tarHeader *tar.Header | ||
| tarHeader, err = tarReader.Next() | ||
| if err == io.EOF { | ||
| break | ||
| } | ||
| if err != nil { | ||
| return fmt.Errorf("reading tar header of %s: %w", srcPath, err) | ||
| } | ||
|
|
||
| fileInfo := tarHeader.FileInfo() | ||
|
|
||
| filePath := filepath.Join(dstDirPath, tarHeader.Name) | ||
|
|
||
| // protect against "Zip Slip" | ||
| if !strings.HasPrefix(filePath, dstDirPath) { | ||
| // mimic standard error, which will be returned in future versions of Go by default | ||
| // more info can be found by "tarinsecurepath" variable name | ||
| return tar.ErrInsecurePath | ||
| } | ||
|
|
||
| fileDirPath := filePath | ||
| if !fileInfo.Mode().IsDir() { | ||
| fileDirPath = filepath.Dir(fileDirPath) | ||
| } | ||
|
|
||
| if err = os.MkdirAll(fileDirPath, 0755); err != nil { | ||
| return fmt.Errorf("making dirs for path %s: %w", fileDirPath, err) | ||
| } | ||
|
|
||
| if fileInfo.Mode().IsDir() { | ||
| continue | ||
| } | ||
|
|
||
| err = tarUnpackFile(filePath, tarReader, fileInfo) | ||
| if err != nil { | ||
| return fmt.Errorf("unpacking archive %s: %w", filePath, err) | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func tarUnpackFile(dstFileName string, src io.Reader, srcFileInfo fs.FileInfo) (err error) { | ||
| var dstFile *os.File | ||
| dstFile, err = os.OpenFile(dstFileName, os.O_RDWR|os.O_CREATE|os.O_TRUNC, srcFileInfo.Mode().Perm()) | ||
| if err != nil { | ||
| return fmt.Errorf("opening destination file %s: %w", dstFileName, err) | ||
| } | ||
| defer func() { | ||
| err = errors.Join(err, closeAndWrapErr(dstFile, "closing destination file %s: %w", dstFile)) | ||
| }() | ||
|
|
||
| n, err := io.Copy(dstFile, src) | ||
| if err != nil { | ||
| return fmt.Errorf("copying to destination file %s: %w", dstFileName, err) | ||
| } | ||
|
|
||
| if srcFileInfo.Mode().IsRegular() && n != srcFileInfo.Size() { | ||
| return fmt.Errorf("written size check failed for %s: wrote %d, want %d", dstFileName, n, srcFileInfo.Size()) | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| func closeAndWrapErr(closer io.Closer, errFormat string, a ...any) error { | ||
| if err := closer.Close(); err != nil { | ||
| a = append(a, err) | ||
| return fmt.Errorf(errFormat, a...) | ||
| } | ||
| return nil | ||
| } |
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