GNU bug report logs - #21166
24.4; vc-mode and git error on newly added file to new repository

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Package: emacs; Severity: minor; Reported by: Ed Avis <eda@HIDDEN>; Keywords: confirmed; dated Fri, 31 Jul 2015 14:44:02 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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Subject: Re: bug#21166: 24.4; vc-mode and git error on newly added file to new
 repository
To: Ed Avis <eda@HIDDEN>, 21166 <at> debbugs.gnu.org
References: <7E039918541B4C4183BFDB8F015C743032E5C672@HIDDEN>
From: Dmitry Gutov <dgutov@HIDDEN>
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Date: Fri, 31 Jul 2015 20:44:16 +0300
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On 07/31/2015 08:27 PM, Ed Avis wrote:
> I guess you don't have to add an extra process call but just check for this error message, and if so, show the diff as from an empty tree.

That's a good point, but doing an extra process call depending on the 
result of the first is also non-trivial here, because the first call is 
often asynchronous, and we handle those in a not particularly composable 
way.

For instance, this patch doesn't work reliably:

diff --git a/lisp/vc/vc-git.el b/lisp/vc/vc-git.el
index 9522328..b556de1 100644
--- a/lisp/vc/vc-git.el
+++ b/lisp/vc/vc-git.el
@@ -1032,13 +1032,18 @@ or BRANCH^ (where \"^\" can be repeated)."
                 command
                 "--exit-code"
                 (append (vc-switches 'git 'diff)
-                       (list "-p" (or rev1 "HEAD") rev2 "--")))
+                       (list "-p" rev1 rev2 "--")))
        (vc-git-command (or buffer "*vc-diff*") 1 files
                        "difftool" "--exit-code" "--no-prompt" "-x"
                        (concat "diff "
                                (mapconcat 'identity
                                           (vc-switches nil 'diff) " "))
-                      rev1 rev2 "--"))))
+                      rev1 rev2 "--"))
+    (vc-run-delayed
+      (when (looking-at "fatal: bad revision 'HEAD'")
+        (let ((inhibit-read-only t))
+          (erase-buffer)
+          (vc-git-diff files "4b825dc642cb6eb9a060e54bf8d69288fbee4904" 
rev2 buffer async))))))

  (defun vc-git-revision-table (_files)
    ;; What about `files'?!?  --Stef





Information forwarded to bug-gnu-emacs@HIDDEN:
bug#21166; Package emacs. Full text available.

Message received at 21166 <at> debbugs.gnu.org:


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From: Ed Avis <eda@HIDDEN>
To: "'dgutov@HIDDEN'" <dgutov@HIDDEN>, "'21166 <at> debbugs.gnu.org'"
 <21166 <at> debbugs.gnu.org>
Subject: Re: bug#21166: 24.4; vc-mode and git error on newly added file to
 new repository
Thread-Topic: bug#21166: 24.4; vc-mode and git error on newly added file to
 new repository
Thread-Index: AdDLnrzz5kFiFpc+QBSz1E14nD58swADsjyAAAIm8LQ=
Date: Fri, 31 Jul 2015 17:27:10 +0000
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I guess you don't have to add an extra process call but just check for thi=
s error message, and if so, show the diff as from an empty tree.=20

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Information forwarded to bug-gnu-emacs@HIDDEN:
bug#21166; Package emacs. Full text available.

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Subject: Re: bug#21166: 24.4; vc-mode and git error on newly added file to new
 repository
To: Ed Avis <eda@HIDDEN>, 21166 <at> debbugs.gnu.org
References: <7E039918541B4C4183BFDB8F015C743032E5C24D@HIDDEN>
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On 07/31/2015 05:43 PM, Ed Avis wrote:

> Type some text in the buffer, save with C-x C-s, then ask for a diff
> with C-x v =.  This fails with the following text at the bottom of the screen:
>
> -UU-:----F1  a              All L1    Git@master  (Fundamental) ---
> fatal: bad revision 'HEAD'

Indeed, I can reproduce this.

But it's a relatively rare situation (no commits in the repo yet), and 
the git diff output will be less useful than usual, since it's a given 
that all your files are either added or simply unregistered.

To fix this, it seems we'll have to add an extra process call to 
determine whether HEAD is a valid reference (Git internals apparently do 
that). I'm not sure it's worth it.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#21166; Package emacs. Full text available.
Added tag(s) confirmed. Request was from Glenn Morris <rgm@HIDDEN> to control <at> debbugs.gnu.org. Full text available.
Severity set to 'minor' from 'normal' Request was from Glenn Morris <rgm@HIDDEN> to control <at> debbugs.gnu.org. Full text available.
bug Marked as found in versions 24.5. Request was from Glenn Morris <rgm@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

Message received at submit <at> debbugs.gnu.org:


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From: Ed Avis <eda@HIDDEN>
To: "'bug-gnu-emacs@HIDDEN'" <bug-gnu-emacs@HIDDEN>
Subject: 24.4; vc-mode and git error on newly added file to new repository
Thread-Topic: 24.4; vc-mode and git error on newly added file to new repository
Thread-Index: AdDLnrzz5kFiFpc+QBSz1E14nD58sw==
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At the shell make an empty git working tree and add one file to it,
but without committing, then edit it in Emacs:

% mkdir test
% cd test
% git init
Initialized empty Git repository in /home/eda/test/.git/
% echo >a
% git add a
% emacs -Q a

Type some text in the buffer, save with C-x C-s, then ask for a diff
with C-x v =3D.  This fails with the following text at the bottom of the s=
creen:

-UU-:----F1  a              All L1    Git@master  (Fundamental) ---
fatal: bad revision 'HEAD'

-UUU:**--F1  *vc-diff*      All L1     (Fundamental from a) ----
Running git --no-pager diff-index --exit-code -p HEAD  -- a...FAILED (stat=
us 128)


In GNU Emacs 24.4.1 (x86_64-redhat-linux-gnu, GTK+ Version 3.10.9)
 of 2014-11-03 on wcl-linux04.wcl.local
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 --infodir=3D/usr/share/info --with-dbus --with-gif --with-jpeg --with-png=

 --with-rsvg --with-tiff --with-xft --with-xpm --with-x-toolkit=3Dgtk3
 --with-gpm=3Dno build_alias=3Dx86_64-redhat-linux-gnu
 host_alias=3Dx86_64-redhat-linux-gnu 'CFLAGS=3D-DMAIL_USE_LOCKF -O2 -g
 -pipe -Wall -Wp,-D_FORTIFY_SOURCE=3D2 -fexceptions
 -fstack-protector-strong --param=3Dssp-buffer-size=3D4
 -grecord-gcc-switches -m64 -mtune=3Dgeneric' 'LDFLAGS=3D-Wl,-z,relro ''

Important settings:
  value of $LC_COLLATE: C
  value of $LC_CTYPE: en_GB.UTF-8
  value of $LC_MESSAGES: en_GB.UTF-8
  value of $LC_MONETARY: en_GB.UTF-8
  value of $LC_NUMERIC: en_GB.UTF-8
  value of $LC_TIME: en_GB.UTF-8
  value of $LANG: en_GB.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Fundamental

Minor modes in effect:
  diff-auto-refine-mode: t
  shell-dirtrack-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
p C-a ESC f DEL DEL DEL DEL c a t DEL DEL DEL e c h=20
o SPC ' # ! / b i n / s h ' RET e c h o SPC C-a C-k=20
r DEL l n SPC - s SPC / b i TAB f a TAB l TAB C-a C-k=20
r m SPC . g i TAB h o TAB p r e TAB - c TAB RET l n=20
SPC - s SPC / h DEL b i TAB f a TAB l TAB s e SPC .=20
g i TAB h o TAB p r e - c o TAB DEL DEL DEL DEL DEL=20
DEL DEL DEL RET e c h o SPC > a RET g t DEL i t SPC=20
a d d SPC a RET C-x C-f a RET h e l l o RET C-x C-s=20
C-x v =3D q C-g C-g ESC x s h e l l RET ESC > g i t SPC=20
s t a t u s RET C-x 1 c d SPC . . RET r m SPC - r f=20
SPC t e s t RET c d SPC t e s t C-a C-k m k d i r SPC=20
t e s t RET c d SPC t e s t RET g i t SPC i n i t RET=20
e c j h SPC DEL DEL DEL h SPC o > DEL DEL DEL o SPC=20
> a RET g i t SPC a d d SPC a RET C-x C-f a RET y e=20
s RET a C-x C-s C-x v =3D C-x b RET C-x 1 C-x b a RET=20
ESC x r e p o r t SPC e SPC b RET

Recent messages:
Finding changes in /home/eda/test/a...
vc-do-command: Running git --no-pager diff-index --exit-code -p HEAD  -- a=
...FAILED (status 128)
call-interactively: Buffer is read-only: #<buffer *vc-diff*>
Quit [2 times]
Mark set
~=20
~/test=20
Saving file /home/eda/test/a...
Wrote /home/eda/test/a
Finding changes in /home/eda/test/a...
vc-do-command: Running git --no-pager diff-index --exit-code -p HEAD  -- a=
...FAILED (status 128)

Load-path shadows:
None found.

Features:
(shadow sort emacsbug sendmail apropos vc-bzr vc-sccs vc-svn vc-cvs
vc-rcs rect macros debug network-stream starttls tls mail-extr etags
sh-script smie executable smerge-mode edmacro kmacro sql view mule-util
python json dired tabify imenu man help-mode log-view diff-mode vc
vc-dispatcher cus-edit wid-edit cus-start cus-load perl-mode dabbrev
nxml-uchnm rng-xsd xsd-regexp rng-cmpct rng-nxml rng-valid rng-loc
rng-uri rng-parse nxml-parse rng-match rng-dt rng-util rng-pttrn nxml-ns
nxml-mode nxml-outln nxml-rap nxml-util nxml-glyph nxml-enc xmltok ffap
thingatpt url-parse auth-source eieio eieio-core gnus-util
password-cache url-vars misearch multi-isearch vc-git pcmpl-unix xterm
time-date log-edit easy-mmode message format-spec rfc822 mml mml-sec
mm-decode mm-bodies mm-encode mail-parse rfc2231 rfc2047 rfc2045
ietf-drums mm-util mail-prsvr mailabbrev mail-utils gmm-utils mailheader
pcvs-util add-log server csharp-mode advice help-fns byte-opt bytecomp
byte-compile cconv cc-langs cc-mode cc-fonts easymenu cc-guess cc-menus
cc-cmds cc-styles cc-align cc-engine cc-vars cc-defs zoom-frm frame-cmds
frame-fns cl-macs avoid cl gv cl-loaddefs cl-lib compile shell pcomplete
comint ring ansi-color tooltip electric uniquify ediff-hook vc-hooks
lisp-float-type mwheel x-win x-dnd tool-bar dnd fontset image regexp-opt
fringe tabulated-list newcomment lisp-mode prog-mode register page
menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock font-lock
syntax facemenu font-core frame cham georgian utf-8-lang misc-lang
vietnamese tibetan thai tai-viet lao korean japanese hebrew greek
romanian slovak czech european ethiopic indian cyrillic chinese
case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer 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 make-network-process dbusbind
gfilenotify dynamic-setting system-font-setting font-render-setting
move-toolbar gtk x-toolkit x multi-tty emacs)

Memory information:
((conses 16 2123160 189079)
 (symbols 48 30370 0)
 (miscs 40 1280 7066)
 (strings 32 74802 19252)
 (string-bytes 1 3893095)
 (vectors 16 42168)
 (vector-slots 8 1773808 319851)
 (floats 8 1683 1258)
 (intervals 56 365598 3016)
 (buffers 960 190)
 (heap 1024 107029 5604))

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Acknowledgement sent to Ed Avis <eda@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#21166; Package emacs. Full text available.
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Last modified: Fri, 31 Jul 2015 17:45:01 UTC

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Copyright (C) 1999 Darren O. Benham, 1997 nCipher Corporation Ltd, 1994-97 Ian Jackson.