bump dependencies

vendor/github.com/jesseduffield/go-getter/decompress_tar.go

@@ -0,0 +1,160 @@
+package getter
+
+import (
+	"archive/tar"
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"time"
+)
+
+// untar is a shared helper for untarring an archive. The reader should provide
+// an uncompressed view of the tar archive.
+func untar(input io.Reader, dst, src string, dir bool) error {
+	tarR := tar.NewReader(input)
+	done := false
+	dirHdrs := []*tar.Header{}
+	now := time.Now()
+	for {
+		hdr, err := tarR.Next()
+		if err == io.EOF {
+			if !done {
+				// Empty archive
+				return fmt.Errorf("empty archive: %s", src)
+			}
+
+			break
+		}
+		if err != nil {
+			return err
+		}
+
+		if hdr.Typeflag == tar.TypeXGlobalHeader || hdr.Typeflag == tar.TypeXHeader {
+			// don't unpack extended headers as files
+			continue
+		}
+
+		path := dst
+		if dir {
+			// Disallow parent traversal
+			if containsDotDot(hdr.Name) {
+				return fmt.Errorf("entry contains '..': %s", hdr.Name)
+			}
+
+			path = filepath.Join(path, hdr.Name)
+		}
+
+		if hdr.FileInfo().IsDir() {
+			if !dir {
+				return fmt.Errorf("expected a single file: %s", src)
+			}
+
+			// A directory, just make the directory and continue unarchiving...
+			if err := os.MkdirAll(path, 0755); err != nil {
+				return err
+			}
+
+			// Record the directory information so that we may set its attributes
+			// after all files have been extracted
+			dirHdrs = append(dirHdrs, hdr)
+
+			continue
+		} else {
+			// There is no ordering guarantee that a file in a directory is
+			// listed before the directory
+			dstPath := filepath.Dir(path)
+
+			// Check that the directory exists, otherwise create it
+			if _, err := os.Stat(dstPath); os.IsNotExist(err) {
+				if err := os.MkdirAll(dstPath, 0755); err != nil {
+					return err
+				}
+			}
+		}
+
+		// We have a file. If we already decoded, then it is an error
+		if !dir && done {
+			return fmt.Errorf("expected a single file, got multiple: %s", src)
+		}
+
+		// Mark that we're done so future in single file mode errors
+		done = true
+
+		// Open the file for writing
+		dstF, err := os.Create(path)
+		if err != nil {
+			return err
+		}
+		_, err = io.Copy(dstF, tarR)
+		dstF.Close()
+		if err != nil {
+			return err
+		}
+
+		// Chmod the file
+		if err := os.Chmod(path, hdr.FileInfo().Mode()); err != nil {
+			return err
+		}
+
+		// Set the access and modification time if valid, otherwise default to current time
+		aTime := now
+		mTime := now
+		if hdr.AccessTime.Unix() > 0 {
+			aTime = hdr.AccessTime
+		}
+		if hdr.ModTime.Unix() > 0 {
+			mTime = hdr.ModTime
+		}
+		if err := os.Chtimes(path, aTime, mTime); err != nil {
+			return err
+		}
+	}
+
+	// Perform a final pass over extracted directories to update metadata
+	for _, dirHdr := range dirHdrs {
+		path := filepath.Join(dst, dirHdr.Name)
+		// Chmod the directory since they might be created before we know the mode flags
+		if err := os.Chmod(path, dirHdr.FileInfo().Mode()); err != nil {
+			return err
+		}
+		// Set the mtime/atime attributes since they would have been changed during extraction
+		aTime := now
+		mTime := now
+		if dirHdr.AccessTime.Unix() > 0 {
+			aTime = dirHdr.AccessTime
+		}
+		if dirHdr.ModTime.Unix() > 0 {
+			mTime = dirHdr.ModTime
+		}
+		if err := os.Chtimes(path, aTime, mTime); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+// tarDecompressor is an implementation of Decompressor that can
+// unpack tar files.
+type tarDecompressor struct{}
+
+func (d *tarDecompressor) Decompress(dst, src string, dir bool) error {
+	// If we're going into a directory we should make that first
+	mkdir := dst
+	if !dir {
+		mkdir = filepath.Dir(dst)
+	}
+	if err := os.MkdirAll(mkdir, 0755); err != nil {
+		return err
+	}
+
+	// File first
+	f, err := os.Open(src)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	return untar(f, dst, src, dir)
+}