misc/dist: use archive/tar.FileInfoHeader

Fixes #3299

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/6250056

misc/dist/bindist.go

@@ -581,7 +581,8 @@ func makeTar(targ, workdir string) error {
 		if *verbose {
 			log.Printf("adding to tar: %s", name)
 		}
-		hdr, err := tarFileInfoHeader(fi, path)
+		target, _ := os.Readlink(path)
+		hdr, err := tar.FileInfoHeader(fi, target)
 		if err != nil {
 			return err
 		}
@@ -752,64 +753,3 @@ func lookPath(prog string) (absPath string, err error) {
 	}
 	return
 }
-
-// sysStat, if non-nil, populates h from system-dependent fields of fi.
-var sysStat func(fi os.FileInfo, h *tar.Header) error
-
-// Mode constants from the tar spec.
-const (
-	c_ISDIR  = 040000
-	c_ISFIFO = 010000
-	c_ISREG  = 0100000
-	c_ISLNK  = 0120000
-	c_ISBLK  = 060000
-	c_ISCHR  = 020000
-	c_ISSOCK = 0140000
-)
-
-// tarFileInfoHeader creates a partially-populated Header from an os.FileInfo.
-// The filename parameter is used only in the case of symlinks, to call os.Readlink.
-// If fi is a symlink but filename is empty, an error is returned.
-func tarFileInfoHeader(fi os.FileInfo, filename string) (*tar.Header, error) {
-	h := &tar.Header{
-		Name:    fi.Name(),
-		ModTime: fi.ModTime(),
-		Mode:    int64(fi.Mode().Perm()), // or'd with c_IS* constants later
-	}
-	switch {
-	case fi.Mode()&os.ModeType == 0:
-		h.Mode |= c_ISREG
-		h.Typeflag = tar.TypeReg
-		h.Size = fi.Size()
-	case fi.IsDir():
-		h.Typeflag = tar.TypeDir
-		h.Mode |= c_ISDIR
-	case fi.Mode()&os.ModeSymlink != 0:
-		h.Typeflag = tar.TypeSymlink
-		h.Mode |= c_ISLNK
-		if filename == "" {
-			return h, fmt.Errorf("archive/tar: unable to populate Header.Linkname of symlinks")
-		}
-		targ, err := os.Readlink(filename)
-		if err != nil {
-			return h, err
-		}
-		h.Linkname = targ
-	case fi.Mode()&os.ModeDevice != 0:
-		if fi.Mode()&os.ModeCharDevice != 0 {
-			h.Mode |= c_ISCHR
-			h.Typeflag = tar.TypeChar
-		} else {
-			h.Mode |= c_ISBLK
-			h.Typeflag = tar.TypeBlock
-		}
-	case fi.Mode()&os.ModeSocket != 0:
-		h.Mode |= c_ISSOCK
-	default:
-		return nil, fmt.Errorf("archive/tar: unknown file mode %v", fi.Mode())
-	}
-	if sysStat != nil {
-		return h, sysStat(fi, h)
-	}
-	return h, nil
-}

misc/dist/stat_darwin.go

-// Copyright 2012 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// +build darwin
-
-package main
-
-import (
-	"archive/tar"
-	"os"
-	"syscall"
-	"time"
-)
-
-func init() {
-	sysStat = func(fi os.FileInfo, h *tar.Header) error {
-		sys, ok := fi.Sys().(*syscall.Stat_t)
-		if !ok {
-			return nil
-		}
-		h.Uid = int(sys.Uid)
-		h.Gid = int(sys.Gid)
-		// TODO(bradfitz): populate username & group.  os/user
-		// doesn't cache LookupId lookups, and lacks group
-		// lookup functions.
-		h.AccessTime = time.Unix(sys.Atimespec.Unix())
-		h.ChangeTime = time.Unix(sys.Ctimespec.Unix())
-		// TODO(bradfitz): major/minor device numbers?
-		return nil
-	}
-}

misc/dist/stat_linux.go

-// Copyright 2012 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// +build linux
-
-package main
-
-import (
-	"archive/tar"
-	"os"
-	"syscall"
-	"time"
-)
-
-func init() {
-	sysStat = func(fi os.FileInfo, h *tar.Header) error {
-		sys, ok := fi.Sys().(*syscall.Stat_t)
-		if !ok {
-			return nil
-		}
-		h.Uid = int(sys.Uid)
-		h.Gid = int(sys.Gid)
-		// TODO(bradfitz): populate username & group.  os/user
-		// doesn't cache LookupId lookups, and lacks group
-		// lookup functions.
-		h.AccessTime = time.Unix(sys.Atim.Unix())
-		h.ChangeTime = time.Unix(sys.Ctim.Unix())
-		// TODO(bradfitz): major/minor device numbers?
-		return nil
-	}
-}