GNU bug report logs - #49786
28.0.50; [PATCH] package-install shouldn't change default-directory

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

From: dick <dick.r.chiang <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 28.0.50; [PATCH] package-install shouldn't change default-directory
Date: Fri, 30 Jul 2021 15:12:06 -0400

[Message part 1 (text/plain, inline)]

Commit 606b783acb leverages a 2015 hack that extracts the
package version from the buffer file name, only he has to
explicitly `set-visited-file-name` to do it.

`set-visited-file-name` has the adverse side effect of
changing the default-directory, and that causes me problems.

If the ostensible reason for bug#48137 was to get the "lm"
functions dos-aware, then why not do that instead of applying
a workaround on top of a hack?

[0001-set-visited-file-name-side-effects.patch (text/x-diff, attachment)]

[Message part 3 (text/plain, inline)]

In GNU Emacs 28.0.50 (build 5, x86_64-pc-linux-gnu, GTK+ Version 3.22.30, cairo version 1.15.10)
 of 2021-07-30 built on dick
Repository revision: 56f173f578945d9fe69c590ed722ac2554bf52c5
Repository branch: el-gz
Windowing system distributor 'The X.Org Foundation', version 11.0.11906000
System Description: Ubuntu 18.04.4 LTS

Configured using:
 'configure --prefix=/home/dick/.local
 PKG_CONFIG_PATH=/home/dick/.local/lib/pkgconfig'

Configured features:
CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG JSON LCMS2
LIBSELINUX LIBXML2 MODULES NOTIFY INOTIFY PDUMPER PNG RSVG SECCOMP SOUND
THREADS TIFF TOOLKIT_SCROLL_BARS X11 XDBE XIM XPM GTK3 ZLIB

Important settings:
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/home/dick/.emacs.d/elpa/gnus-5.14pre/mm-partial hides /home/dick/.local/share/emacs/28.0.50/lisp/gnus/mm-partial
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/home/dick/.emacs.d/elpa/gnus-5.14pre/nngateway hides /home/dick/.local/share/emacs/28.0.50/lisp/gnus/nngateway
/home/dick/.emacs.d/elpa/gnus-5.14pre/gnus-logic hides /home/dick/.local/share/emacs/28.0.50/lisp/gnus/gnus-logic
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/home/dick/.emacs.d/elpa/gnus-5.14pre/nnir hides /home/dick/.local/share/emacs/28.0.50/lisp/obsolete/nnir

Features:
(shadow sort flyspell ispell footnote mail-extr gnus-msg nnselect gnus-search
eieio-opt speedbar ezimage dframe find-func gnus-art mm-uu mml2015 mm-view
mml-smime smime dig gnus-sum shr svg dom gnus-group mm-url gnus-undo
gnus-start gnus-dbus dbus xml gnus-cloud nnimap nnmail mail-source imap
rfc2104 utf7 netrc nnoo parse-time iso8601 gnus-spec gnus-int gnus-range
gnus-win emacsbug sendmail paredit-ext paredit subed subed-vtt subed-srt
subed-common subed-mpv subed-debug subed-config dired-x inf-ruby ruby-mode
smie company haskell-interactive-mode haskell-presentation-mode
haskell-process haskell-session haskell-compile haskell-mode haskell-cabal
haskell-utils haskell-font-lock haskell-indentation haskell-string
haskell-sort-imports haskell-lexeme haskell-align-imports
haskell-complete-module haskell-ghc-support etags fileloop generator dabbrev
haskell-customize hydra lv use-package-ensure paren solarized-theme
solarized-definitions projectile skeleton ibuf-macs find-dired ibuf-ext
ibuffer ibuffer-loaddefs grep gnus message rx rmc puny dired dired-loaddefs
rfc822 mml mml-sec epa epg epg-config mm-decode mm-bodies mm-encode mail-parse
rfc2231 mailabbrev gmm-utils mailheader pcase nnheader gnus-util rmail
rmail-loaddefs rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils
time-date flx-ido flx google-translate-default-ui google-translate-core-ui
facemenu color ido google-translate-core google-translate-tk
google-translate-backend use-package-bind-key bind-key auto-complete advice
popup cus-edit pp cus-load wid-edit ess-r-mode ess-r-flymake flymake-proc
flymake warnings thingatpt ess-r-xref xref ess-trns ess-r-package shell
pcomplete ess-r-completion ess-roxy ess-r-syntax ess-rd noutline outline
easy-mmode hideshow ess-s-lang ess-help ess-mode ess-inf project format-spec
ess-tracebug ess ess-utils ess-custom compile text-property-search comint
ansi-color emms-player-mplayer emms-player-simple emms emms-compat cl-extra
help-mode use-package-core derived hl-line winner ring edmacro kmacro
finder-inf json-reformat-autoloads json-snatcher-autoloads sml-mode-autoloads
tornado-template-mode-autoloads info package browse-url url url-proxy
url-privacy url-expand url-methods url-history url-cookie url-domsuf url-util
mailcap url-handlers url-parse auth-source cl-seq eieio eieio-core cl-macs
eieio-loaddefs password-cache json subr-x map url-vars seq byte-opt gv
bytecomp byte-compile cconv cl-loaddefs cl-lib iso-transl 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 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 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 lcms2
dynamic-setting system-font-setting font-render-setting cairo move-toolbar gtk
x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 16 644627 86727)
 (symbols 48 31461 1)
 (strings 32 105346 5386)
 (string-bytes 1 3433253)
 (vectors 16 29604)
 (vector-slots 8 446904 28165)
 (floats 8 433 49)
 (intervals 56 336 0)
 (buffers 992 10))

Message #8 received at 49786 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: dick <dick.r.chiang <at> gmail.com>, Ioannis Kappas <ioannis.kappas <at> gmail.com>
Cc: 49786 <at> debbugs.gnu.org
Subject: Re: bug#49786: 28.0.50;
 [PATCH] package-install shouldn't change default-directory
Date: Fri, 30 Jul 2021 22:54:02 +0300

> From: dick <dick.r.chiang <at> gmail.com>
> Date: Fri, 30 Jul 2021 15:12:06 -0400
> 
> Commit 606b783acb leverages a 2015 hack that extracts the
> package version from the buffer file name, only he has to
> explicitly `set-visited-file-name` to do it.
> 
> `set-visited-file-name` has the adverse side effect of
> changing the default-directory, and that causes me problems.

Ioannis, could you please tell why you needed to call
set-visited-file-name there?

> If the ostensible reason for bug#48137 was to get the "lm"
> functions dos-aware, then why not do that instead of applying
> a workaround on top of a hack?

This was discussed in that bug, and the conclusion was that it's a
worse alternative than the solution eventually installed.

> * test/lisp/emacs-lisp/package-tests.el (package-test-install-file-EOLs):
> What is "mac" encoding?  It doesn't work.  The names of
> salient coding systems do not coincide with the predominant
> desktop operating systems.

The 'mac' encoding is documented in the ELisp manual.  Please don't
remove its testing here.

Message #11 received at 49786 <at> debbugs.gnu.org (full text, mbox):

From: dick <dick.r.chiang <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 49786 <at> debbugs.gnu.org, Ioannis Kappas <ioannis.kappas <at> gmail.com>
Subject: Re: bug#49786: 28.0.50; [PATCH] package-install shouldn't change
 default-directory
Date: Fri, 30 Jul 2021 16:41:15 -0400

EZ> The 'mac' encoding is documented in the ELisp manual.  Please don't remove
EZ> its testing here.

Ah, so it does.  I'm rather content to let the OS9 diehards stew in
their own obsolescence.  There's no telling what else doesn't work on an OS
that was last released in the twentieth century.  But it's impossible to
disabuse the maintainer of the maintainer ethos: "preservation above-all" [1].

[1] Even if the thing being preserved (a test for the 'mac encoding) is but one week old.

Message #14 received at 49786 <at> debbugs.gnu.org (full text, mbox):

From: Ioannis Kappas <ioannis.kappas <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 49786 <at> debbugs.gnu.org, dick <dick.r.chiang <at> gmail.com>
Subject: Re: bug#49786: 28.0.50;
 [PATCH] package-install shouldn't change default-directory
Date: Fri, 30 Jul 2021 21:50:13 +0100

Hi

On Fri, Jul 30, 2021 at 8:54 PM Eli Zaretskii <eliz <at> gnu.org> wrote:
>
> > From: dick <dick.r.chiang <at> gmail.com>
> > Date: Fri, 30 Jul 2021 15:12:06 -0400
> >
> > Commit 606b783acb leverages a 2015 hack that extracts the
> > package version from the buffer file name, only he has to
> > explicitly `set-visited-file-name` to do it.
> >
> > `set-visited-file-name` has the adverse side effect of
> > changing the default-directory, and that causes me problems.
>
> Ioannis, could you please tell why you needed to call
> set-visited-file-name there?
>

We `set-visited-file-name' after we literally read the package into a buffer,
so that we can extract the original filename in `package-install-from-buffer'
with `buffer-file-name' and determine its original coding system with
`find-operation-coding-system'.

Once we determine the coding system, we can then decode the literal buffer
and parse the package headers using the original encoding.

Could you please elaborate a bit more what issue does this cause?

thanks

Message #21 received at 49786 <at> debbugs.gnu.org (full text, mbox):

From: dick <dick.r.chiang <at> gmail.com>
To: Ioannis Kappas <ioannis.kappas <at> gmail.com>
Cc: 49786 <at> debbugs.gnu.org, Eli Zaretskii <eliz <at> gnu.org>
Subject: Re: bug#49786: 28.0.50; [PATCH] package-install shouldn't change
 default-directory
Date: Fri, 30 Jul 2021 21:27:02 -0400

Ah, my apologies.  The sole mention of `buffer-file-name` in `lisp-mnt.el`
describes a hack that seemed custom-made for skirting the carriage return
problem.

IK> Could you please elaborate a bit more what issue does this cause?

Now that the default-directory can change mid-stream in
`package-install-file`, I will have to amend something that relied on it being
constant.  It should be okay, particularly if bug#49788 gets merged.

Message #24 received at 49786 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: dick <dick.r.chiang <at> gmail.com>
Cc: 49786 <at> debbugs.gnu.org, ioannis.kappas <at> gmail.com
Subject: Re: bug#49786: 28.0.50; [PATCH] package-install shouldn't change
 default-directory
Date: Sat, 31 Jul 2021 09:09:32 +0300

> From: dick <dick.r.chiang <at> gmail.com>
> Cc: Ioannis Kappas <ioannis.kappas <at> gmail.com>,  49786 <at> debbugs.gnu.org
> Date: Fri, 30 Jul 2021 16:41:15 -0400
> 
> EZ> The 'mac' encoding is documented in the ELisp manual.  Please don't remove
> EZ> its testing here.
> 
> Ah, so it does.  I'm rather content to let the OS9 diehards stew in
> their own obsolescence.  There's no telling what else doesn't work on an OS
> that was last released in the twentieth century.  But it's impossible to
> disabuse the maintainer of the maintainer ethos: "preservation above-all" [1].

The 'mac' encoding is not about that old OS, it's about documents
written on that OS.  The documents can outlive their OS by many
decades.

Message #27 received at 49786 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: dick <dick.r.chiang <at> gmail.com>
Cc: 49786 <at> debbugs.gnu.org, ioannis.kappas <at> gmail.com
Subject: Re: bug#49786: 28.0.50; [PATCH] package-install shouldn't change
 default-directory
Date: Sat, 31 Jul 2021 09:19:56 +0300

> From: dick <dick.r.chiang <at> gmail.com>
> Cc: Eli Zaretskii <eliz <at> gnu.org>,  49786 <at> debbugs.gnu.org
> Date: Fri, 30 Jul 2021 21:27:02 -0400
> 
> Ah, my apologies.  The sole mention of `buffer-file-name` in `lisp-mnt.el`
> describes a hack that seemed custom-made for skirting the carriage return
> problem.
> 
> IK> Could you please elaborate a bit more what issue does this cause?
> 
> Now that the default-directory can change mid-stream in
> `package-install-file`, I will have to amend something that relied on it being
> constant.  It should be okay, particularly if bug#49788 gets merged.

Does this mean that if bug#49788 is fixed, we can close this bug
without any further action?  Or are there any further issues caused by
set-visited-file-name that you are aware of?

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