GNU bug report logs - #62663
28.2; vc-hg-state returns incorrect results on directories in some repos

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Spencer Baugh <sbaugh <at> janestreet.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 28.2; vc-hg-state returns incorrect results on directories in some
 repos
Date: Tue, 04 Apr 2023 10:05:19 -0400

The problem is with vc-hg-state-fast, which parses Mercurial data
structures instead of shelling out to hg.  This is a great idea but our
parsing seems to be wrong right now in some way.

1. Create a new hg repo with:

hg init
  --config format.use_share_safe=false
  --config format.use-persistent-nodemap=false
  --config format.sparse-revlog=false
  --config format.revlog-compression=zlib

(This is disabling some recent hg features which make vc-hg-state use
the slow path.  You can verify that vc-hg-state-fast is going to run by
checking that .hg/requirements is a subset of
vc-hg-supported-requirements)

2. touch foo && hg add foo && hg commit -m.
3. (vc-hg-state-slow ".")
Returns 'up-to-date which is correct (because it shells out to hg)
4. (vc-hg-state ".")
Returns 'unregistered which is wrong

To a user, this manifests as various hg commands failing with errors,
often something like
"vc-find-backend-function: Cannot open load file: No such file or directory, vc-nil"

This also happens on Emacs 29.

(Note that this is independent of my other bug about lack of support for
certain repo requirements.  That bug is about expanding vc-hg-state-fast
support to new repos; this bug is showing that the already existing
support is buggy!)


In GNU Emacs 28.2 (build 1, x86_64-pc-linux-gnu, X toolkit, cairo version 1.15.12, Xaw scroll bars)
 of 2023-02-09 built on igm-qws-u12685a
Repository revision: 739b5d0e52d83ec567bd61a5a49ac0e93e0eb469
Repository branch: HEAD
Windowing system distributor 'The X.Org Foundation', version 11.0.12011000
System Description: CentOS Linux 7 (Core)

Configured using:
 'configure --with-x-toolkit=lucid --without-gpm --without-gconf
 --without-selinux --without-imagemagick --with-modules --with-gif=no
 --with-cairo --with-rsvg
 --prefix=/j/office/app/emacs/builds/28.2-20230209-135825'

Configured features:
CAIRO DBUS FREETYPE GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG JSON LIBXML2
MODULES NOTIFY INOTIFY PDUMPER PNG RSVG SECCOMP SOUND THREADS TIFF
TOOLKIT_SCROLL_BARS X11 XDBE XIM XPM LUCID ZLIB

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

Major mode: Dired by name

Minor modes in effect:
  shell-dirtrack-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  show-paren-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
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  line-number-mode: t
  indent-tabs-mode: t
  transient-mark-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug sendmail dabbrev pp cl-print log-edit
message rmc puny rfc822 mml mml-sec epa derived epg rfc6068 epg-config
gnus-util rmail rmail-loaddefs auth-source eieio eieio-core cl-macs
eieio-loaddefs password-cache json map time-date subr-x mm-decode
mm-bodies mm-encode mail-parse rfc2231 rfc2047 rfc2045 mm-util
ietf-drums mail-prsvr mailabbrev mail-utils gmm-utils mailheader
pcvs-util add-log shell pcomplete comint ansi-color ring misearch
multi-isearch jka-compr find-func shortdoc text-property-search
vc-annotate vc-filewise thingatpt help-fns radix-tree help-mode cl-seq
vc-mtn vc-hg vc-git diff-mode easy-mmode vc-bzr vc-src vc-sccs vc-svn
vc-cvs vc-rcs vc-dir seq byte-opt gv bytecomp byte-compile cconv ewoc vc
vc-dispatcher dired-aux cl-loaddefs cl-lib dired dired-loaddefs
iso-transl tooltip eldoc paren electric uniquify ediff-hook vc-hooks
lisp-float-type elisp-mode 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 lisp-mode prog-mode register page tab-bar menu-bar
rfn-eshadow isearch easymenu timer select scroll-bar mouse jit-lock
font-lock syntax font-core term/tty-colors frame minibuffer 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 emoji-zwj charscript
charprop case-table epa-hook jka-cmpr-hook help simple abbrev obarray
cl-preloaded nadvice button loaddefs faces cus-face macroexp files
window text-properties overlay sha1 md5 base64 format env code-pages
mule custom widget hashtable-print-readable backquote threads dbusbind
inotify dynamic-setting system-font-setting font-render-setting cairo
x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 16 119456 11097)
 (symbols 48 13754 1)
 (strings 32 40872 1164)
 (string-bytes 1 1248921)
 (vectors 16 18713)
 (vector-slots 8 234707 16776)
 (floats 8 86 32)
 (intervals 56 1922 0)
 (buffers 992 25)
 (heap 1024 18673 1560))

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