// 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, err := filepath.Rel(srcPath, filePath); err != nil {
return err
} else if skip, err := fileutils.Matches(relFilePath, excludes); err != nil {
return err
} 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
})
}
// TarWithOptions creates an archive from the directory at `path`, only including files whose relative
// paths are included in `options.IncludeFiles` (if non-nil) or not in `options.ExcludePatterns`.
func TarWithOptions(srcPath string, options *TarOptions) (io.ReadCloser, error) {
pipeReader, pipeWriter := io.Pipe()
compressWriter, err := CompressStream(pipeWriter, options.Compression)
if err != nil {
return nil, err
}
go func() {
ta := &tarAppender{
TarWriter: tar.NewWriter(compressWriter),
Buffer: pools.BufioWriter32KPool.Get(nil),
SeenFiles: make(map[uint64]string),
}
// this buffer is needed for the duration of this piped stream
defer pools.BufioWriter32KPool.Put(ta.Buffer)
// In general we log errors here but ignore them because
// during e.g. a diff operation the container can continue
// mutating the filesystem and we can see transient errors
// from this
if options.IncludeFiles == nil {
options.IncludeFiles = []string{"."}
}
seen := make(map[string]bool)
var renamedRelFilePath string // For when tar.Options.Name is set
for _, include := range options.IncludeFiles {
filepath.Walk(filepath.Join(srcPath, include), func(filePath string, f os.FileInfo, err error) error {
if err != nil {
log.Debugf("Tar: Can't stat file %s to tar: %s", srcPath, err)
return nil
}
relFilePath, err := filepath.Rel(srcPath, filePath)
if err != nil || (relFilePath == "." && f.IsDir()) {
// Error getting relative path OR we are looking
// at the root path. Skip in both situations.
return nil
}
skip := false
// If "include" is an exact match for the current file
// then even if there's an "excludePatterns" pattern that
// matches it, don't skip it. IOW, assume an explicit 'include'
// is asking for that file no matter what - which is true
// for some files, like .dockerignore and Dockerfile (sometimes)
if include != relFilePath {
skip, err = fileutils.Matches(relFilePath, options.ExcludePatterns)
if err != nil {
log.Debugf("Error matching %s", relFilePath, err)
return err
}
}
if skip {
if f.IsDir() {
return filepath.SkipDir
}
return nil
}
if seen[relFilePath] {
return nil
}
seen[relFilePath] = true
// Rename the base resource
if options.Name != "" && filePath == srcPath+"/"+filepath.Base(relFilePath) {
renamedRelFilePath = relFilePath
}
// Set this to make sure the items underneath also get renamed
if options.Name != "" {
relFilePath = strings.Replace(relFilePath, renamedRelFilePath, options.Name, 1)
}
if err := ta.addTarFile(filePath, relFilePath); err != nil {
log.Debugf("Can't add file %s to tar: %s", filePath, err)
}
return nil
})
}
// Make sure to check the error on Close.
if err := ta.TarWriter.Close(); err != nil {
log.Debugf("Can't close tar writer: %s", err)
}
if err := compressWriter.Close(); err != nil {
log.Debugf("Can't close compress writer: %s", err)
}
if err := pipeWriter.Close(); err != nil {
log.Debugf("Can't close pipe writer: %s", err)
}
}()
return pipeReader, nil
}