bug#81625: 31.0.60; vc-git-status can return incorrect status information

X-Debbugs-Cc:
--text follows this line--

My ~/.emacs is tracked in a Git repo.

The issue isn't specifically related to ~/.emacs; that's just how I
encountered it.

With:

  [~] emacs -Q .emacs

... I noticed that the `vc-mode' portion of mode-line shows
"Git!master", where "!" indicates "ignored".

Importantly, my ~/.gitignore contains this pertinent line:

  [~] grep emacs .gitignore
  .emacs.d/

This incorrect/misleading info. (i.e., `vc-mode' -> "Git!master",
rather than "Git-master", when the file is current/clean w.r.t. its
Git status)
seems to result from the following command constructed by `vc-git-state':

  [~] git status --porcelain -z --untracked-files --ignored -- .emacs
  !! .emacs.d/elpa/vterm-20260626.1906/build/libvterm-prefix/src/libvterm/^@

This latter path
(.emacs.d/elpa/vterm-20260626.1906/build/libvterm-prefix/src/libvterm/)
isn't special in any way that I'm aware of.

In contrast, when ~/.emacs is modified, the "git status" command
returns the following, and `vc-mode' indicates "Git:master", as
expected.

  [~] git status --porcelain -z --untracked-files --ignored -- .emacs
   M .emacs^@!!
.emacs.d/elpa/vterm-20260626.1906/build/libvterm-prefix/src/libvterm/^@

Or, without "-z", for readability here:

  [~] git status --porcelain --untracked-files --ignored -- .emacs
   M .emacs
  !! .emacs.d/elpa/vterm-20260626.1906/build/libvterm-prefix/src/libvterm/

I'm using:

  [~] git --version
  git version 2.47.3

It seems to me that one solution would be for `vc-git-state' to
post-process the `status',
as returned from (status (apply #'vc-git--run-command-string file args)),
so as to match up the returned info. with the specified `file'.

I can't see that this result relates to any recent Emacs changes, nor
have I found any applicable bug report.
(I found this old/fixed bug, but it seems unrelated: bug#39452:
[PATCH] vc-git-state fails for filenames with wildcards.)

Regards,
Lester

--------------------------------------------------

In GNU Emacs 31.0.60 (build 1, aarch64-unknown-linux-gnu, GTK+ Version
 3.24.49, cairo version 1.18.4) of 2026-06-28 built on penguin
Repository revision: e4d529c67b6a751c3a0858b057afafd1b37cd30a
Repository branch: emacs-31
System Description: Debian GNU/Linux 13 (trixie)

Configured using:
 'configure --with-pgtk 'CFLAGS=-g -O2
 -Werror=implicit-function-declaration
 -ffile-prefix-map=/tmp/emacs.git=. -fstack-protector-strong
 -fstack-clash-protection -Wformat -Werror=format-security
 -mbranch-protection=standard -Wall' 'CPPFLAGS=-Wdate-time
 -D_FORTIFY_SOURCE=2' LDFLAGS=-Wl,-z,relro'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
LCMS2 LIBOTF LIBSYSTEMD LIBXML2 MODULES NATIVE_COMP NOTIFY INOTIFY
PDUMPER PGTK PNG RSVG SECCOMP SOUND THREADS TIFF TOOLKIT_SCROLL_BARS
TREE_SITTER WEBP XIM GTK3 ZLIB

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

Major mode: Elisp/d

Minor modes in effect:
  outline-minor-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  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
  minibuffer-nonselected-mode: t
  minibuffer-regexp-mode: t
  line-number-mode: t
  indent-tabs-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug lisp-mnt message mailcap yank-media puny
dired dired-loaddefs rfc822 mml mml-sec password-cache epa derived epg
rfc6068 epg-config gnus-util text-property-search time-date subr-x
mule-util mm-decode mm-bodies mm-encode mailabbrev gmm-utils mailheader
sendmail mail-parse rfc2231 rfc2047 rfc2045 ietf-drums mm-util
mail-prsvr mail-utils comp-run bytecomp byte-compile comp-common rx
vc-git diff-mode track-changes easy-mmode files-x vc-dispatcher pcase
noutline outline cus-edit pp cus-start cus-load icons wid-edit
cl-loaddefs cl-lib rmc iso-transl tooltip cconv eldoc paren electric
uniquify ediff-hook vc-hooks lisp-float-type elisp-mode mwheel
term/pgtk-win pgtk-win term/common-win touch-screen pgtk-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 nadvice seq simple cl-generic
indonesian philippine 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 abbrev obarray oclosure cl-preloaded button loaddefs
theme-loaddefs faces cus-face macroexp files window text-properties
overlay sha1 md5 base64 format env code-pages mule custom widget keymap
hashtable-print-readable backquote threads dbusbind inotify
dynamic-setting system-font-setting font-render-setting cairo gtk pgtk
lcms2 multi-tty move-toolbar make-network-process tty-child-frames
native-compile emacs)

Memory information:
((conses 16 102553 24015) (symbols 48 8869 0) (strings 32 21819 2299)
 (string-bytes 1 670103) (vectors 16 12851)
 (vector-slots 8 174733 13454) (floats 8 37 468)
 (intervals 56 2619 261) (buffers 1064 11))