package archive // import "github.com/docker/docker/pkg/archive" import ( "archive/tar" "bytes" "io" ) // Generate generates a new archive from the content provided // as input. // // `files` is a sequence of path/content pairs. A new file is // added to the archive for each pair. // If the last pair is incomplete, the file is created with an // empty content. For example: // // Generate("foo.txt", "hello world", "emptyfile") // // The above call will return an archive with 2 files: // * ./foo.txt with content "hello world" // * ./empty with empty content // // FIXME: stream content instead of buffering // FIXME: specify permissions and other archive metadata func Generate(input ...string) (io.Reader, error) { files := parseStringPairs(input...) buf := new(bytes.Buffer) tw := tar.NewWriter(buf) for _, file := range files { name, content := file[0], file[1] hdr := &tar.Header{ Name: name, Size: int64(len(content)), } if err := tw.WriteHeader(hdr); err != nil { return nil, err } if _, err := tw.Write([]byte(content)); err != nil { return nil, err } } if err := tw.Close(); err != nil { return nil, err } return buf, nil } func parseStringPairs(input ...string) (output [][2]string) { output = make([][2]string, 0, len(input)/2+1) for i := 0; i < len(input); i += 2 { var pair [2]string pair[0] = input[i] if i+1 < len(input) { pair[1] = input[i+1] } output = append(output, pair) } return }