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Subject: bug#57503: 28.1.91; package-selected-packages should not be saved to custom-file
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The variable `package-selected-packages` should not be saved to the users i=
nit
file (or whatever `custom-file` points to). This was discussed before on
emacs-devel but wasn't resolved:

<https://lists.gnu.org/archive/html/emacs-devel/2016-02/msg00958.html> but=
=20

The gist of it is that if you keep your configuration under version control,
having package-selected-packages written to your config file is inconvenien=
t if
you share your config across multiple machines but do not want to have the =
exact
same set of packages installed on each.

Even if you do want to keep the exact same set of packages on each machine,=
 you
still need to be careful about installing them, because the order of package
installation affects the order of package-selected-packages, and so does
deleting and reinstalling a package. As a result, I often experienced
meaningless VC conflicts that needed to be resolved.

IMHO the value of package-selected-packages should be written to a separate
file, so that it's possible to put it under version control or ignore it,
independently from the rest of one's configuration.


In GNU Emacs 28.1.91 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.20, c=
airo version 1.16.0)
 of 2022-08-03 built on Lenovo
Repository revision: f23d45603918721ec80bfcef883d22fab15cb9f1
Repository branch: emacs-28
Windowing system distributor 'The X.Org Foundation', version 11.0.12013000
System Description: elementary OS 6.1 J=C3=B3lnir

Configured using:
 'configure --with-native-compilation'
Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG JSON
LCMS2 LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT MODULES NATIVE_COMP NOT=
IFY
INOTIFY PDUMPER PNG RSVG SECCOMP SOUND THREADS TIFF TOOLKIT_SCROLL_BARS X11=
 XDBE
XIM XPM GTK3 ZLIB
Important settings:
  value of $LC_MONETARY: en_IE.UTF-8
  value of $LC_NUMERIC: en_IE.UTF-8
  value of $LC_TIME: en_IE.UTF-8
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=3Dibus
  locale-coding-system: utf-8-unix

Major mode: mu4e:main

Minor modes in effect:
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  delete-selection-mode: t
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  show-paren-mode: t
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  buffer-read-only: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t
  auto-save-visited-mode: t
  overwrite-mode: overwrite-mode-binary

Load-path shadows:
~/.emacs.d/lisp/custom hides /usr/local/share/emacs/28.1.91/lisp/custom
/home/joost/.emacs.d/elpa/transient-20220806.2224/transient hides /usr/loca=
l/share/emacs/28.1.91/lisp/transient

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Memory information:
((conses 16 848943 78066)
 (symbols 48 64672 39)
 (strings 32 228119 24655)
 (string-bytes 1 8079504)
 (vectors 16 112770)
 (vector-slots 8 1998465 158112)
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 (buffers 992 24))

--=20
Joost Kremers
Life has its moments

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X-Loop: help-debbugs@HIDDEN
From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Joost Kremers <joostkremers@HIDDEN>
Subject: bug#57503: Acknowledgement (28.1.91; package-selected-packages
 should not be saved to custom-file)
Message-ID: <handler.57503.B.16619516698648.ack <at> debbugs.gnu.org>
References: <87bks0368n.fsf@HIDDEN>
X-Gnu-PR-Message: ack 57503
X-Gnu-PR-Package: emacs
Reply-To: 57503 <at> debbugs.gnu.org
Date: Wed, 31 Aug 2022 13:15:01 +0000

Thank you for filing a new bug report with debbugs.gnu.org.

This is an automatically generated reply to let you know your message
has been received.

Your message is being forwarded to the package maintainers and other
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Your message has been sent to the package maintainer(s):
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If you wish to submit further information on this problem, please
send it to 57503 <at> debbugs.gnu.org.

Please do not send mail to help-debbugs@HIDDEN unless you wish
to report a problem with the Bug-tracking system.

--=20
57503: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D57503
GNU Bug Tracking System
Contact help-debbugs@HIDDEN with problems

Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#57503: 28.1.91; package-selected-packages should not be saved to custom-file
Resent-From: Philip Kaludercic <philipk@HIDDEN>
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To: Joost Kremers <joostkremers@HIDDEN>
Cc: 57503 <at> debbugs.gnu.org
From: Philip Kaludercic <philipk@HIDDEN>
In-Reply-To: <87bks0368n.fsf@HIDDEN> (Joost Kremers's message of "Wed, 31
 Aug 2022 14:43:43 +0200")
References: <87bks0368n.fsf@HIDDEN>
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Date: Fri, 02 Sep 2022 13:11:39 +0000
Message-ID: <87h71pc450.fsf@HIDDEN>
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Joost Kremers <joostkremers@HIDDEN> writes:

> The variable `package-selected-packages` should not be saved to the users init
> file (or whatever `custom-file` points to). This was discussed before on
> emacs-devel but wasn't resolved:
>
> <https://lists.gnu.org/archive/html/emacs-devel/2016-02/msg00958.html> but 
>
> The gist of it is that if you keep your configuration under version control,
> having package-selected-packages written to your config file is inconvenient if
> you share your config across multiple machines but do not want to have the exact
> same set of packages installed on each.
>
> Even if you do want to keep the exact same set of packages on each machine, you
> still need to be careful about installing them, because the order of package
> installation affects the order of package-selected-packages, and so does
> deleting and reinstalling a package. As a result, I often experienced
> meaningless VC conflicts that needed to be resolved.
>
> IMHO the value of package-selected-packages should be written to a separate
> file, so that it's possible to put it under version control or ignore it,
> independently from the rest of one's configuration.

How about writing it into a file like "~/.config/emacs/elpa/selected-packages"?

Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#57503: 28.1.91; package-selected-packages should not be saved to custom-file
Resent-From: Robert Pluim <rpluim@HIDDEN>
Original-Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org>
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To: Philip Kaludercic <philipk@HIDDEN>
Cc: Joost Kremers <joostkremers@HIDDEN>, 57503 <at> debbugs.gnu.org
From: Robert Pluim <rpluim@HIDDEN>
In-Reply-To: <87h71pc450.fsf@HIDDEN> (Philip Kaludercic's message of "Fri, 
 02 Sep 2022 13:11:39 +0000")
References: <87bks0368n.fsf@HIDDEN> <87h71pc450.fsf@HIDDEN>
Date: Fri, 02 Sep 2022 15:17:52 +0200
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>>>>> On Fri, 02 Sep 2022 13:11:39 +0000, Philip Kaludercic <philipk@posteo=
.net> said:
    >> IMHO the value of package-selected-packages should be written to a s=
eparate
    >> file, so that it's possible to put it under version control or ignor=
e it,
    >> independently from the rest of one's configuration.

    Philip> How about writing it into a file like "~/.config/emacs/elpa/sel=
ected-packages"?

Didn=CA=BCt Lars add `define-multisession-variable' exactly for this kind
of use case?

Robert
--=20

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 Content preview:  Philip Kaludercic <philipk@HIDDEN> writes: > How about
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 defcustom could just be changed to a define-multisession-variable. 
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Philip Kaludercic <philipk@HIDDEN> writes:

> How about writing it into a file like
> "~/.config/emacs/elpa/selected-packages"?

The defcustom could just be changed to a define-multisession-variable.

Message sent to bug-gnu-emacs@HIDDEN:

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--=-=-=
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable

>>>>> On Fri, 02 Sep 2022 15:17:55 +0200, Lars Ingebrigtsen <larsi@HIDDEN=
> said:

    Lars> Philip Kaludercic <philipk@HIDDEN> writes:
    >> How about writing it into a file like
    >> "~/.config/emacs/elpa/selected-packages"?

    Lars> The defcustom could just be changed to a define-multisession-vari=
able.

For values of 'just' that are a little bigger than changing that one
line =F0=9F=98=80

rough=CA=BCn=CA=BCready patch attached. Seems to work fine. I=CA=BCve not t=
ested the
interaction with a .emacs that has package-selected-packages set, but
if I understand multisession variables correctly that will just be
ignored.


--=-=-=
Content-Type: text/x-diff
Content-Disposition: attachment;
 filename=0001-Make-package-selected-packages-a-multisession-variab.patch

From 1a84bfbc1b568da6bf63bf9679a317b29f78d0e9 Mon Sep 17 00:00:00 2001
From: Robert Pluim <rpluim@HIDDEN>
Date: Fri, 2 Sep 2022 16:28:11 +0200
Subject: [PATCH] Make package-selected-packages a multisession variable
To: emacs-devel@HIDDEN

---
 lisp/emacs-lisp/package.el | 63 ++++++++++++++++++--------------------
 1 file changed, 30 insertions(+), 33 deletions(-)

diff --git a/lisp/emacs-lisp/package.el b/lisp/emacs-lisp/package.el
index ed23ee5f22..cda55bd90e 100644
--- a/lisp/emacs-lisp/package.el
+++ b/lisp/emacs-lisp/package.el
@@ -384,7 +384,8 @@ package-unsigned-archives
   :risky t
   :version "24.4")
 
-(defcustom package-selected-packages nil
+(require 'multisession)
+(define-multisession-variable package-selected-packages nil
   "Store here packages installed explicitly by user.
 This variable is fed automatically by Emacs when installing a new package.
 This variable is used by `package-autoremove' to decide
@@ -395,8 +396,8 @@ package-selected-packages
 To check if a package is contained in this list here, use
 `package--user-selected-p', as it may populate the variable with
 a sane initial value."
-  :version "25.1"
-  :type '(repeat symbol))
+  :synchronized t
+  :package "package")
 
 (defcustom package-native-compile nil
   "Non-nil means to natively compile packages as part of their installation.
@@ -1907,22 +1908,15 @@ package--find-non-dependencies
              unless (memq name dep-list)
              collect name)))
 
-(defun package--save-selected-packages (&optional value)
-  "Set and save `package-selected-packages' to VALUE."
-  (when value
-    (setq package-selected-packages value))
-  (if after-init-time
-      (customize-save-variable 'package-selected-packages package-selected-packages)
-    (add-hook 'after-init-hook #'package--save-selected-packages)))
-
 (defun package--user-selected-p (pkg)
   "Return non-nil if PKG is a package was installed by the user.
 PKG is a package name.
 This looks into `package-selected-packages', populating it first
 if it is still empty."
-  (unless (consp package-selected-packages)
-    (package--save-selected-packages (package--find-non-dependencies)))
-  (memq pkg package-selected-packages))
+  (unless (consp (multisession-value package-selected-packages))
+    (setf (multisession-value package-selected-packages)
+          (package--find-non-dependencies)))
+  (memq pkg (multisession-value package-selected-packages)))
 
 (defun package--get-deps (pkgs)
   (let ((seen '()))
@@ -1950,7 +1944,7 @@ package--removable-packages
   "Return a list of names of packages no longer needed.
 These are packages which are neither contained in
 `package-selected-packages' nor a dependency of one that is."
-  (let ((needed (package--get-deps package-selected-packages)))
+  (let ((needed (package--get-deps (multisession-value package-selected-packages))))
     (cl-loop for p in (mapcar #'car package-alist)
              unless (or (memq p needed)
                         ;; Do not auto-remove external packages.
@@ -2151,8 +2145,8 @@ package-install
                   (package-desc-name pkg)
                 pkg)))
     (unless (or dont-select (package--user-selected-p name))
-      (package--save-selected-packages
-       (cons name package-selected-packages)))
+      (setf (multisession-value package-selected-packages)
+       (cons name (multisession-value package-selected-packages))))
     (if-let* ((transaction
                (if (package-desc-p pkg)
                    (unless (package-installed-p pkg)
@@ -2284,8 +2278,8 @@ package-install-from-buffer
     ;; Install the package itself.
     (package-unpack pkg-desc)
     (unless (package--user-selected-p name)
-      (package--save-selected-packages
-       (cons name package-selected-packages)))
+      (setf (multisession-value package-selected-packages)
+       (cons name (multisession-value package-selected-packages))))
     (package--quickstart-maybe-refresh)
     pkg-desc))
 
@@ -2317,9 +2311,9 @@ package-install-selected-packages
   ;; We don't need to populate `package-selected-packages' before
   ;; using here, because the outcome is the same either way (nothing
   ;; gets installed).
-  (if (not package-selected-packages)
+  (if (not (multisession-value package-selected-packages))
       (message "`package-selected-packages' is empty, nothing to install")
-    (let* ((not-installed (seq-remove #'package-installed-p package-selected-packages))
+    (let* ((not-installed (seq-remove #'package-installed-p (multisession-value package-selected-packages)))
            (available (seq-filter (lambda (p) (assq p package-archive-contents)) not-installed))
            (difference (- (length not-installed) (length available))))
       (cond
@@ -2393,7 +2387,8 @@ package-delete
                ;; Don't deselect if this is an older version of an
                ;; upgraded package.
                (package--newest-p pkg-desc))
-      (package--save-selected-packages (remove name package-selected-packages)))
+      (setf (multisession-value package-selected-packages)
+            (remove name (multisession-value package-selected-packages))))
     (cond ((not (string-prefix-p (file-name-as-directory
                                   (expand-file-name package-user-dir))
                                  (expand-file-name dir)))
@@ -2485,7 +2480,7 @@ package-autoremove
   ;; If `package-selected-packages' is nil, it would make no sense to
   ;; try to populate it here, because then `package-autoremove' will
   ;; do absolutely nothing.
-  (when (or package-selected-packages
+  (when (or (multisession-value package-selected-packages)
             (yes-or-no-p
              (format-message
               "`package-selected-packages' is empty! Really remove ALL packages? ")))
@@ -3730,15 +3725,17 @@ package--update-selected-packages
 ADD and REMOVE must be disjoint lists of package names (or
 `package-desc' objects) to be added and removed to the selected
 packages list, respectively."
-  (dolist (p add)
-    (cl-pushnew (if (package-desc-p p) (package-desc-name p) p)
-                package-selected-packages))
-  (dolist (p remove)
-    (setq package-selected-packages
-          (remove (if (package-desc-p p) (package-desc-name p) p)
-                  package-selected-packages)))
-  (when (or add remove)
-    (package--save-selected-packages package-selected-packages)))
+  (let ((packages (multisession-value package-selected-packages)))
+    (dolist (p add)
+      (cl-pushnew (if (package-desc-p p) (package-desc-name p) p)
+                  packages))
+    (dolist (p remove)
+      (setq packages
+            (remove (if (package-desc-p p) (package-desc-name p) p)
+                    packages)))
+    (when (or add remove)
+      (setf (multisession-value package-selected-packages)
+            packages))))
 
 (defun package-menu-execute (&optional noquery)
   "Perform marked Package Menu actions.
@@ -3797,7 +3794,7 @@ package-menu-execute
           ;; Packages being upgraded are not marked as selected.
           (package--update-selected-packages .install .delete)
           (package-menu--perform-transaction install-list delete-list)
-          (when package-selected-packages
+          (when (multisession-value package-selected-packages)
             (if-let* ((removable (package--removable-packages)))
                 (message "Operation finished.  Packages that are no longer needed: %d.  Type `%s' to remove them"
                          (length removable)
-- 
2.37.2.382.g795ea8776b


--=-=-=--

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Date: Sat, 03 Sep 2022 11:52:44 +0200
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 Content preview:  Robert Pluim <rpluim@HIDDEN> writes: > For values of 'just'
    that are a little bigger than changing that one > line =?UTF-8?Q?=F0=9F=98=80_?= =?UTF-8?Q?=F0=9F=98=89?= 
 
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Robert Pluim <rpluim@HIDDEN> writes:

> For values of 'just' that are a little bigger than changing that one
> line =F0=9F=98=80

=F0=9F=98=89

> rough=CA=BCn=CA=BCready patch attached. Seems to work fine. I=CA=BCve not=
 tested the
> interaction with a .emacs that has package-selected-packages set, but
> if I understand multisession variables correctly that will just be
> ignored.

Hm, yes -- if we do this, we'll end up with all users both having that
variable saved in their init file in addition to the multisession
storage.  Hm.  That sounds really confusing.

I can also see people running into difficulties when switching between
older and newer versions of Emacs, and Emacs becoming very confused.

Hm...  I don't immediately see any way to make this work seamlessly in a
way that's backwards/forwards compatible.

Message sent to bug-gnu-emacs@HIDDEN:

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In-Reply-To: <875yi4iy37.fsf@HIDDEN> (Lars Ingebrigtsen's message of "Sat,
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References: <87bks0368n.fsf@HIDDEN> <87h71pc450.fsf@HIDDEN>
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Lars Ingebrigtsen <larsi@HIDDEN> writes:

> Robert Pluim <rpluim@HIDDEN> writes:
>
>> For values of 'just' that are a little bigger than changing that one
>> line =F0=9F=98=80
>
> =F0=9F=98=89
>
>> rough=CA=BCn=CA=BCready patch attached. Seems to work fine. I=CA=BCve no=
t tested the
>> interaction with a .emacs that has package-selected-packages set, but
>> if I understand multisession variables correctly that will just be
>> ignored.
>
> Hm, yes -- if we do this, we'll end up with all users both having that
> variable saved in their init file in addition to the multisession
> storage.  Hm.  That sounds really confusing.
>
> I can also see people running into difficulties when switching between
> older and newer versions of Emacs, and Emacs becoming very confused.
>
> Hm...  I don't immediately see any way to make this work seamlessly in a
> way that's backwards/forwards compatible.

What about if we allowed setting `package-selected-packages' to a symbol
like 'external, in which case the list would be saved in a file?  That
way users would have to explicitly opt-in.

Message sent to bug-gnu-emacs@HIDDEN:

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Philip Kaludercic <philipk@HIDDEN> writes:

>> Hm...  I don't immediately see any way to make this work seamlessly in a
>> way that's backwards/forwards compatible.
>
> What about if we allowed setting `package-selected-packages' to a symbol
> like 'external, in which case the list would be saved in a file?  That
> way users would have to explicitly opt-in.

But that would still break things for people who go back to using an
older Emacs version.

Message sent to bug-gnu-emacs@HIDDEN:

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Lars Ingebrigtsen <larsi@HIDDEN> writes:

> Hm...  I don't immediately see any way to make this work seamlessly in a
> way that's backwards/forwards compatible.

How about something like this:

- Keep the old defcustom, and add a new multisession variable.

- If the old variable exists, use it.  Otherwise the new one.

- Add a new command that "upgrades" the variable into a multisession
  variable.  Make it say that it will break things on Emacs < 29.  Don't
  run it automatically.

- In Emacs version N (e.g., 5 major versions from now?), upgrade any
  user automatically, without prompting, and make the defcustom
  obsolete.

Message sent to bug-gnu-emacs@HIDDEN:

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> The variable `package-selected-packages` should not be saved to the
> users init file (or whatever `custom-file` points to).

Yet, for some use cases it should.
So maybe we need to introduce a custom variable to choose whether it is
saved as a normal user config or not.


        Stefan

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 Content preview: Stefan Kangas <stefankangas@HIDDEN> writes: > - Keep the
 old defcustom, and add a new multisession variable. > > - If the old variable
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Stefan Kangas <stefankangas@HIDDEN> writes:

> - Keep the old defcustom, and add a new multisession variable.
>
> - If the old variable exists, use it.  Otherwise the new one.
>
> - Add a new command that "upgrades" the variable into a multisession
>   variable.  Make it say that it will break things on Emacs < 29.  Don't
>   run it automatically.
>
> - In Emacs version N (e.g., 5 major versions from now?), upgrade any
>   user automatically, without prompting, and make the defcustom
>   obsolete.

Hm...  I think this has the disadvantage that it both requires user
intervention, but in addition it'll force you into one usage pattern or
another at some point.

I think perhaps Stefan M's suggestion of adding a new user option to
control the behaviour here is the only practical way forward.

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>>>>> On Sun, 04 Sep 2022 12:52:47 +0200, Lars Ingebrigtsen <larsi@HIDDEN=
> said:

    Lars> Stefan Kangas <stefankangas@HIDDEN> writes:
    >> - Keep the old defcustom, and add a new multisession variable.
    >>=20
    >> - If the old variable exists, use it.  Otherwise the new one.
    >>=20
    >> - Add a new command that "upgrades" the variable into a multisession
    >> variable.  Make it say that it will break things on Emacs < 29.  Don=
't
    >> run it automatically.
    >>=20
    >> - In Emacs version N (e.g., 5 major versions from now?), upgrade any
    >> user automatically, without prompting, and make the defcustom
    >> obsolete.

    Lars> Hm...  I think this has the disadvantage that it both requires us=
er
    Lars> intervention, but in addition it'll force you into one usage patt=
ern or
    Lars> another at some point.

    Lars> I think perhaps Stefan M's suggestion of adding a new user option=
 to
    Lars> control the behaviour here is the only practical way forward.

I=CA=BCm not convinced that=CA=BCs necessary. I just did the following:

1. emacs-29+my patch, install some packages =3D> no package-selected-packag=
es
setting
2. emacs-28, run `package-list-packages=CA=BC =3D> package-selected-packages
is populated with packages set in step 1, and saved in .emacs
3. emacs-28, install some packages
4. emacs-29+my-patch, `package-list-packages=CA=BC, error because it now
has a setting for package-selected-packages, which means we need to
call the multisession variable something different. I fixed that, and
the packages installed in step 3 show up [1]

So for the small number of people going backwards from emacs-29, the
problem fixes itself, and we can document that, and for people going
forwards to emacs-29 and staying there is no manual intervention
needed.

Robert

Footnotes:
[1]  We can now argue about what to call that variable. I went for
     `package-selected-packages-ms=CA=BC for now

--=20

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Robert Pluim <rpluim@HIDDEN> writes:

> I=CA=BCm not convinced that=CA=BCs necessary. I just did the following:
>
> 1. emacs-29+my patch, install some packages =3D> no package-selected-pack=
ages
> setting
> 2. emacs-28, run `package-list-packages=CA=BC =3D> package-selected-packa=
ges
> is populated with packages set in step 1, and saved in .emacs

Oh, I didn't know that it was automatically recreated.  Then what's the
point of the variable?  According to the doc string:

---
Store here packages installed explicitly by user.
---

Does 2) there get that right, or does it contain all packages installed,
explicitly or not?

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>>>>> On Mon, 05 Sep 2022 13:16:24 +0200, Lars Ingebrigtsen <larsi@HIDDEN=
> said:

    Lars> Robert Pluim <rpluim@HIDDEN> writes:
    >> I=CA=BCm not convinced that=CA=BCs necessary. I just did the followi=
ng:
    >>=20
    >> 1. emacs-29+my patch, install some packages =3D> no package-selected=
-packages
    >> setting
    >> 2. emacs-28, run `package-list-packages=CA=BC =3D> package-selected-=
packages
    >> is populated with packages set in step 1, and saved in .emacs

    Lars> Oh, I didn't know that it was automatically recreated.  Then what=
's the
    Lars> point of the variable?  According to the doc string:

I guess reading a variable is faster than recursing over the elpa
directory.

    Lars> ---
    Lars> Store here packages installed explicitly by user.
    Lars> ---

    Lars> Does 2) there get that right, or does it contain all packages ins=
talled,
    Lars> explicitly or not?

It contains the packages I installed using 'i' in list-packages, but
not their automatically installed dependencies.

Robert
--=20

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From: Robert Pluim <rpluim@HIDDEN>
In-Reply-To: <87tu5mdopn.fsf@HIDDEN> (Robert Pluim's message of "Mon, 05
 Sep 2022 13:51:00 +0200")
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>>>>> On Mon, 05 Sep 2022 13:51:00 +0200, Robert Pluim <rpluim@HIDDEN> s=
aid:

>>>>> On Mon, 05 Sep 2022 13:16:24 +0200, Lars Ingebrigtsen <larsi@HIDDEN=
> said:
    Lars> Robert Pluim <rpluim@HIDDEN> writes:
    >>> I=CA=BCm not convinced that=CA=BCs necessary. I just did the follow=
ing:
    >>>=20
    >>> 1. emacs-29+my patch, install some packages =3D> no package-selecte=
d-packages
    >>> setting
    >>> 2. emacs-28, run `package-list-packages=CA=BC =3D> package-selected=
-packages
    >>> is populated with packages set in step 1, and saved in .emacs

    Lars> Oh, I didn't know that it was automatically recreated.  Then what=
's the
    Lars> point of the variable?  According to the doc string:

Of course one use case that breaks is to do

emacs-29->emacs-28, *delete* some packages, and then go back to
emacs-29, which will pick up the old multi-session value.

I guess we could change emacs-29 to refresh the multi-session value
every time you run `list-packages'.

Robert
--=20

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Robert Pluim <rpluim@HIDDEN> writes:

>     Lars> Oh, I didn't know that it was automatically recreated.  Then
>     Lars> what's the
>     Lars> point of the variable?  According to the doc string:

So it just caches data to speed things up, I guess?  

> Of course one use case that breaks is to do
>
> emacs-29->emacs-28, *delete* some packages, and then go back to
> emacs-29, which will pick up the old multi-session value.
>
> I guess we could change emacs-29 to refresh the multi-session value
> every time you run `list-packages'.

Hm.  Or...  refresh the value if the .emacs.d/elpa directory has fresher
contents than the multisession variable, but I don't know whether that's
faster.

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