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75 lines
2.3 KiB
Diff
75 lines
2.3 KiB
Diff
From bc0de86b495ae014b209431ed7cb90fc3d5e4d1f Mon Sep 17 00:00:00 2001
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From: Kir Kolyshkin <kolyshkin@gmail.com>
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Date: Mon, 9 Apr 2018 15:58:40 -0700
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Subject: [PATCH] archive/tar: do not populate user/group names
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This reverts part of commit 29a18899379c ("archive/tar: populate
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uname/gname/devmajor/devminor in FileInfoHeader"). The reason is
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using os/user functions to resolved uids/gids to names breaks
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the static build for Linux/glibc case (the resulting binary panics
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on NULL pointer dereference).
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For much more details, see https://github.com/golang/go/issues/23265
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Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
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---
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src/archive/tar/stat_unix.go | 26 +++-----------------------
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1 file changed, 3 insertions(+), 23 deletions(-)
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diff --git a/src/archive/tar/stat_unix.go b/src/archive/tar/stat_unix.go
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index 868105f338..9640ed4bab 100644
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--- a/src/archive/tar/stat_unix.go
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+++ b/src/archive/tar/stat_unix.go
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@@ -8,10 +8,7 @@ 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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@@ -19,10 +16,6 @@ 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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-
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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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@@ -31,22 +24,9 @@ func statUnix(fi os.FileInfo, h *Header) error {
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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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-
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+ // TODO(bradfitz): populate username & group. os/user
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+ // doesn't cache LookupId lookups, and lacks group
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+ // lookup functions.
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h.AccessTime = statAtime(sys)
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h.ChangeTime = statCtime(sys)
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base-commit: 4af1337d1e9eb9e7b766c9deb787c78413bb25c4
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--
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2.24.1
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