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bug#31497: 27.0.50; vc-hg doesn't separate standard error from standard

From: Philipp Stephani
Subject: bug#31497: 27.0.50; vc-hg doesn't separate standard error from standard output
Date: Fri, 18 May 2018 19:42:15 +0200

Create a Mercurial repository owned by root and add a hgrc file, e.g.:

$ mkdir -p /tmp/hg
$ cd /tmp/hg
$ sudo -s
# hg init
# echo a > a.txt
# hg addremove
# hg commit -m 'commit message'
# touch .hg/hgrc

Then visit a.txt in Emacs as non-root:

$ emacs -Q a.txt

Instead of the revision number, the status line will show
"Hg-not trusting file /tmp/hg/.hg/hgrc ..."

This is because the status line runs something like

$ hg log -l 1 -r . -T '{rev}'

but that outputs

  not trusting file /tmp/hg/.hg/hgrc from untrusted user root, group root
  not trusting file /tmp/hg/.hg/hgrc from untrusted user root, group root

on stderr, and Emacs merges stderr and stdout.  Rather it should ignore
stderr in this case.

In GNU Emacs 27.0.50 (build 27, x86_64-pc-linux-gnu, GTK+ Version 3.22.24)
 of 2018-05-18 built on localhost
Repository revision: f4d9fd3dd45f767eca33fbf1beee40da790fa74e
Windowing system distributor 'The X.Org Foundation', version 11.0.11906000
System Description: Debian GNU/Linux buster/sid

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.

Configured using:
 'configure --without-threads --enable-gcc-warnings=warn-only
 --enable-gtk-deprecation-warnings --without-pop --with-mailutils
 --enable-checking --enable-check-lisp-object-type --with-modules
 'CFLAGS=-O0 -ggdb3''

Configured features:

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
None found.

(shadow sort mail-extr emacsbug message rmc puny seq byte-opt gv
bytecomp byte-compile cconv dired dired-loaddefs format-spec rfc822 mml
easymenu mml-sec password-cache epa derived epg epg-config gnus-util
rmail rmail-loaddefs mm-decode mm-bodies mm-encode mail-parse rfc2231
mailabbrev gmm-utils mailheader cl-loaddefs cl-lib sendmail rfc2047
rfc2045 ietf-drums mm-util mail-prsvr mail-utils time-date elec-pair
mule-util tooltip eldoc electric uniquify ediff-hook vc-hooks
lisp-float-type mwheel term/x-win x-win term/common-win x-dnd tool-bar
dnd fontset image regexp-opt fringe tabulated-list replace newcomment
text-mode elisp-mode lisp-mode prog-mode register page menu-bar
rfn-eshadow isearch timer select scroll-bar mouse jit-lock font-lock
syntax facemenu font-core term/tty-colors frame cl-generic cham georgian
utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean
japanese eucjp-ms cp51932 hebrew greek romanian slovak czech european
ethiopic indian cyrillic chinese composite charscript charprop
case-table epa-hook jka-cmpr-hook help simple abbrev obarray minibuffer
cl-preloaded nadvice loaddefs button faces cus-face macroexp files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote dbusbind inotify
dynamic-setting system-font-setting font-render-setting move-toolbar gtk
x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 16 95054 11969)
 (symbols 48 20166 1)
 (miscs 40 40 122)
 (strings 32 28302 2388)
 (string-bytes 1 758914)
 (vectors 16 14177)
 (vector-slots 8 499094 14196)
 (floats 8 48 69)
 (intervals 56 222 0)
 (buffers 992 12))

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