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5000b51680
This reverts CL 514235. Also reverts CL 518056 which is a followup fix. Reason for revert: Proposal #50102 defined an interface that is too specific to UNIX-y systems and also didn't make much sense. The proposal is un-accepted, and we'll revisit in Go 1.23. Fixes (via backport) #65245. Updates #50102. Change-Id: I41ba0ee286c1d893e6564a337e5d76418d19435d Reviewed-on: https://go-review.googlesource.com/c/go/+/558295 Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
101 lines
3.2 KiB
Go
101 lines
3.2 KiB
Go
// Copyright 2012 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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//go:build unix
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package tar
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import (
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"io/fs"
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"os/user"
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"runtime"
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"strconv"
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"sync"
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"syscall"
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)
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func init() {
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sysStat = statUnix
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}
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// userMap and groupMap caches UID and GID lookups for performance reasons.
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// The downside is that renaming uname or gname by the OS never takes effect.
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var userMap, groupMap sync.Map // map[int]string
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func statUnix(fi fs.FileInfo, h *Header) error {
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sys, ok := fi.Sys().(*syscall.Stat_t)
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if !ok {
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return nil
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}
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h.Uid = int(sys.Uid)
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h.Gid = int(sys.Gid)
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// Best effort at populating Uname and Gname.
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// The os/user functions may fail for any number of reasons
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// (not implemented on that platform, cgo not enabled, etc).
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if u, ok := userMap.Load(h.Uid); ok {
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h.Uname = u.(string)
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} else if u, err := user.LookupId(strconv.Itoa(h.Uid)); err == nil {
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h.Uname = u.Username
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userMap.Store(h.Uid, h.Uname)
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}
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if g, ok := groupMap.Load(h.Gid); ok {
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h.Gname = g.(string)
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} else if g, err := user.LookupGroupId(strconv.Itoa(h.Gid)); err == nil {
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h.Gname = g.Name
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groupMap.Store(h.Gid, h.Gname)
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}
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h.AccessTime = statAtime(sys)
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h.ChangeTime = statCtime(sys)
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// Best effort at populating Devmajor and Devminor.
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if h.Typeflag == TypeChar || h.Typeflag == TypeBlock {
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dev := uint64(sys.Rdev) // May be int32 or uint32
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switch runtime.GOOS {
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case "aix":
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var major, minor uint32
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major = uint32((dev & 0x3fffffff00000000) >> 32)
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minor = uint32((dev & 0x00000000ffffffff) >> 0)
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h.Devmajor, h.Devminor = int64(major), int64(minor)
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case "linux":
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// Copied from golang.org/x/sys/unix/dev_linux.go.
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major := uint32((dev & 0x00000000000fff00) >> 8)
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major |= uint32((dev & 0xfffff00000000000) >> 32)
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minor := uint32((dev & 0x00000000000000ff) >> 0)
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minor |= uint32((dev & 0x00000ffffff00000) >> 12)
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h.Devmajor, h.Devminor = int64(major), int64(minor)
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case "darwin", "ios":
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// Copied from golang.org/x/sys/unix/dev_darwin.go.
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major := uint32((dev >> 24) & 0xff)
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minor := uint32(dev & 0xffffff)
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h.Devmajor, h.Devminor = int64(major), int64(minor)
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case "dragonfly":
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// Copied from golang.org/x/sys/unix/dev_dragonfly.go.
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major := uint32((dev >> 8) & 0xff)
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minor := uint32(dev & 0xffff00ff)
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h.Devmajor, h.Devminor = int64(major), int64(minor)
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case "freebsd":
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// Copied from golang.org/x/sys/unix/dev_freebsd.go.
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major := uint32((dev >> 8) & 0xff)
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minor := uint32(dev & 0xffff00ff)
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h.Devmajor, h.Devminor = int64(major), int64(minor)
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case "netbsd":
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// Copied from golang.org/x/sys/unix/dev_netbsd.go.
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major := uint32((dev & 0x000fff00) >> 8)
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minor := uint32((dev & 0x000000ff) >> 0)
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minor |= uint32((dev & 0xfff00000) >> 12)
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h.Devmajor, h.Devminor = int64(major), int64(minor)
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case "openbsd":
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// Copied from golang.org/x/sys/unix/dev_openbsd.go.
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major := uint32((dev & 0x0000ff00) >> 8)
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minor := uint32((dev & 0x000000ff) >> 0)
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minor |= uint32((dev & 0xffff0000) >> 8)
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h.Devmajor, h.Devminor = int64(major), int64(minor)
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default:
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// TODO: Implement solaris (see https://golang.org/issue/8106)
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}
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}
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return nil
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}
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