bug#48015: 28.0.50; ELPA package compilation fails

bug#48015: 28.0.50; ELPA package compilation fails

[Michael Albinus]

Scenario:

- emacs -Q /sudo:: # Emacs 27.2 with builtin Tramp
- M-x list-packages
- Mark Tramp 2.5.0.3 with "i"
- Install it with "x"

=> Compilation error

The problem is, that the loaded Tramp version is not compatible with the
Tramp version to be installed.

For Tramp, this problem is mitigated by command `tramp-recompile-elpa'.
But this could happen for any package.


In GNU Emacs 28.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.26, cairo version 1.16.0)
 of 2021-03-08 built on gandalf
Repository revision: 11d3af3c7b9dc5a2910807d311168fb82d962d0d
Repository branch: master
Windowing system distributor 'Fedora Project', version 11.0.12010000
System Description: Fedora 33 (Workstation Edition)

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
LCMS2 LIBOTF LIBSELINUX LIBXML2 M17N_FLT MODULES NOTIFY INOTIFY PDUMPER
PNG RSVG SOUND THREADS TIFF TOOLKIT_SCROLL_BARS X11 XDBE XIM XPM GTK3
ZLIB

Important settings:
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  locale-coding-system: utf-8

Major mode: Group

Minor modes in effect:
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Load-path shadows:
~/lisp/dbus hides /usr/local/share/emacs/28.0.50/lisp/net/dbus
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/home/albinus/src/tramp/lisp/tramp-uu hides /usr/local/share/emacs/28.0.50/lisp/net/tramp-uu
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/home/albinus/src/tramp/lisp/tramp-cmds hides /usr/local/share/emacs/28.0.50/lisp/net/tramp-cmds
/home/albinus/src/tramp/lisp/tramp-compat hides /usr/local/share/emacs/28.0.50/lisp/net/tramp-compat
/home/albinus/src/tramp/lisp/tramp-sudoedit hides /usr/local/share/emacs/28.0.50/lisp/net/tramp-sudoedit
/home/albinus/src/tramp/lisp/tramp-gvfs hides /usr/local/share/emacs/28.0.50/lisp/net/tramp-gvfs
/home/albinus/src/tramp/lisp/tramp-loaddefs hides /usr/local/share/emacs/28.0.50/lisp/net/tramp-loaddefs
/home/albinus/src/tramp/lisp/tramp-crypt hides /usr/local/share/emacs/28.0.50/lisp/net/tramp-crypt
/home/albinus/src/tramp/lisp/tramp-smb hides /usr/local/share/emacs/28.0.50/lisp/net/tramp-smb
/home/albinus/src/tramp/lisp/trampver hides /usr/local/share/emacs/28.0.50/lisp/net/trampver
/home/albinus/src/tramp/lisp/tramp-sshfs hides /usr/local/share/emacs/28.0.50/lisp/net/tramp-sshfs

Features:
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esh-opt esh-proc esh-io esh-arg esh-module esh-groups esh-util finder
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bug#48015: 28.0.50; ELPA package compilation fails

[Stefan Monnier]

> - emacs -Q /sudo:: # Emacs 27.2 with builtin Tramp

Since my account doesn't have sudo access here, I just hit `C-g` at the
prompt.  I don't think it makes the difference (Tramp was loaded in any
case), but I mention it for completeness.

> - M-x list-packages
> - Mark Tramp 2.5.0.3 with "i"
> - Install it with "x"

Done.

> => Compilation error

I don't get any error, neither with Debian testing's Emacs-27.1
nor with the `emacs-27` branch.

What error do you get?


        Stefan

bug#48015: 28.0.50; ELPA package compilation fails

[Michael Albinus]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

Hi Stefan,

>> - emacs -Q /sudo:: # Emacs 27.2 with builtin Tramp
>
> Since my account doesn't have sudo access here, I just hit `C-g` at the
> prompt.  I don't think it makes the difference (Tramp was loaded in any
> case), but I mention it for completeness.

Same here. Hitting C-g at the password prompt is not sufficient to
trigger the error for package installation.

Maybe you could use something else? "emacs -Q /ssh::" did the failing
test.

>> => Compilation error
>
> I don't get any error, neither with Debian testing's Emacs-27.1
> nor with the `emacs-27` branch.
>
> What error do you get?

I'm running a recent build of "GNU Emacs 27.2.50 (build 1,
x86_64-pc-linux-gnu, GTK+ Version 3.24.27) of 2021-03-28" on Fedora
33. But I don't believe it matters.

The point seems to be that default-directory is remote, when you call
list-packages, and try to install Tramp 2.5.0.3. Emacs completely blocks then.

I have seen also other error messages during Tramp package compilation,
which I'm not able to reproduce just now. But let's fix the first
problem first.

>         Stefan

Best regards, Michael.

bug#48015: 28.0.50; ELPA package compilation fails

[Stefan Monnier]

> Same here. Hitting C-g at the password prompt is not sufficient to
> trigger the error for package installation.
>
> Maybe you could use something else? "emacs -Q /ssh::" did the failing
> test.

Indeed, I can reproduce the problem now.  Basically you need
default-directory to be under Tramp's control.

The core problem that I see is the following:

- Emacs's tramp gets loaded
- We go to a Tramp-controlled default-directory
- We call `package--load-files-for-activation`
  - This starts by loading ~/.emacs.d/elpa/tramp-NN.MM/tramp-autoloads.el
    This calls `tramp-register-autoload-file-name-handlers`.
  - At this point, `package--load-files-for-activation` would like to
    continue by (re)loading the new Tramp files, such as `tramp-compat`
    and friends in the same order that they have been loaded
    (i.e. `tramp-compat.el` before `tramp.el`).
  - But before it gets a chance to do that, the file-name handlers
    call `tramp-autoload-file-name-handler` because of `default-directory`,
    which does (load "tramp" 'noerror 'nomessage), which loads the new
    `tramp.el` before we got a change to load the new `tramp-compat.el`,
    which then leads to an error when the new code in `tramp.el` calls
    a new function from `tramp-compat.el` (which happens to be
    `tramp-compat-thread-yield` AFAICT).

At this point, I'm not sure how best to fix the problem.
Maybe replacing (load "tramp" 'noerror 'nomessage) with
(require 'tramp nil t) is all it takes.
Or maybe a better option is to arrange the autoloads such that
`tramp-register-autoload-file-name-handlers` doesn't "unload/unregister" file
handlers that have already been loaded so that the directory that was
already under Tramp's control doesn't re-trigger a call to
`tramp-autoload-file-name-handler`?


        Stefan

bug#48015: 28.0.50; ELPA package compilation fails

[Michael Albinus]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

> The core problem that I see is the following:
>
> - Emacs's tramp gets loaded
> - We go to a Tramp-controlled default-directory
> - We call `package--load-files-for-activation`
>   - This starts by loading ~/.emacs.d/elpa/tramp-NN.MM/tramp-autoloads.el
>     This calls `tramp-register-autoload-file-name-handlers`.
>   - At this point, `package--load-files-for-activation` would like to
>     continue by (re)loading the new Tramp files, such as `tramp-compat`
>     and friends in the same order that they have been loaded
>     (i.e. `tramp-compat.el` before `tramp.el`).
>   - But before it gets a chance to do that, the file-name handlers
>     call `tramp-autoload-file-name-handler` because of `default-directory`,
>     which does (load "tramp" 'noerror 'nomessage), which loads the new
>     `tramp.el` before we got a change to load the new `tramp-compat.el`,
>     which then leads to an error when the new code in `tramp.el` calls
>     a new function from `tramp-compat.el` (which happens to be
>     `tramp-compat-thread-yield` AFAICT).
>
> At this point, I'm not sure how best to fix the problem.
> Maybe replacing (load "tramp" 'noerror 'nomessage) with
> (require 'tramp nil t) is all it takes.
> Or maybe a better option is to arrange the autoloads such that
> `tramp-register-autoload-file-name-handlers` doesn't "unload/unregister" file
> handlers that have already been loaded so that the directory that was
> already under Tramp's control doesn't re-trigger a call to
> `tramp-autoload-file-name-handler`?

What I don't understand: when (load "tramp" 'noerror 'nomessage) is
called, default-directory is already local due to a let-binding.

Anyway, even if the compilation runs through in case of a local
default-directory, the resulting *.elc files have errors. I have quit
Emacs (from the first recipe), and then I have started

emacs -Q -L ~/.emacs.d/elpa/tramp-2.5.0.3/ /ssh::

There are further errors, which are related to a wrong
tramp-compat.el. Only my new command tramp-recompile-elpa fixes this.

>         Stefan

Best regards, Michael.

bug#48015: 28.0.50; ELPA package compilation fails

[Stefan Monnier]

>> The core problem that I see is the following:
>>
>> - Emacs's tramp gets loaded
>> - We go to a Tramp-controlled default-directory
>> - We call `package--load-files-for-activation`
>>   - This starts by loading ~/.emacs.d/elpa/tramp-NN.MM/tramp-autoloads.el
>>     This calls `tramp-register-autoload-file-name-handlers`.
>>   - At this point, `package--load-files-for-activation` would like to
>>     continue by (re)loading the new Tramp files, such as `tramp-compat`
>>     and friends in the same order that they have been loaded
>>     (i.e. `tramp-compat.el` before `tramp.el`).
>>   - But before it gets a chance to do that, the file-name handlers
>>     call `tramp-autoload-file-name-handler` because of `default-directory`,
>>     which does (load "tramp" 'noerror 'nomessage), which loads the new
>>     `tramp.el` before we got a change to load the new `tramp-compat.el`,
>>     which then leads to an error when the new code in `tramp.el` calls
>>     a new function from `tramp-compat.el` (which happens to be
>>     `tramp-compat-thread-yield` AFAICT).
>>
>> At this point, I'm not sure how best to fix the problem.
>> Maybe replacing (load "tramp" 'noerror 'nomessage) with
>> (require 'tramp nil t) is all it takes.
>> Or maybe a better option is to arrange the autoloads such that
>> `tramp-register-autoload-file-name-handlers` doesn't "unload/unregister" file
>> handlers that have already been loaded so that the directory that was
>> already under Tramp's control doesn't re-trigger a call to
>> `tramp-autoload-file-name-handler`?
>
> What I don't understand: when (load "tramp" 'noerror 'nomessage) is
> called, default-directory is already local due to a let-binding.

That's fine, this load functions properly.  The problem is elsewhere:
- loading the new `tramp.el` works properly but results in a broken
  setup because it will not load the new `tramp-compat.el`
  because that feature is already provided.  So you end up with a new`
  tramp.el` calling functions it expects to be provided by the new
  `tramp-compat.el`.
- the Tramp default-directory is not active during the load, but it is
  active right before it (it is the trigger that causes the load, actually)
  and it is active right after it (before package.el gets to reload
  `tramp-compat.el`) and that's when the new code from `tramp.el`
  signals an error because of the missing function from the new
  `tramp-compat.el`.

> Anyway, even if the compilation runs through in case of a local
> default-directory, the resulting *.elc files have errors.
>
> I have quit Emacs (from the first recipe), and then I have started
>
>     emacs -Q -L ~/.emacs.d/elpa/tramp-2.5.0.3/ /ssh::
>
> There are further errors, which are related to a wrong
> tramp-compat.el. Only my new command tramp-recompile-elpa fixes this.

I suspect this is the result of the `find-library-name` problem I fixed
yesterday on `master` (which causes `package.el` not to load the new
files to override the old ones before compiling the new files).

You can circumvent it by loading `find-func` before doing the
`package-install`.  I'm not sure how the GNU ELPA package of Tramp can
protect itself from this bug yet (beside `tramp-recompile-elpa`, of
course).

BTW, maybe one option to circumvent both problems is to replace

    (load "tramp" 'noerror 'nomessage)

with

    (load "tramp-compat" 'noerror 'nomessage)
    (load "tramp" 'noerror 'nomessage)

?


-- Stefan

bug#48015: 28.0.50; ELPA package compilation fails

[Stefan Monnier]

> BTW, maybe one option to circumvent both problems is to replace
>
>     (load "tramp" 'noerror 'nomessage)
>
> with
>
>     (load "tramp-compat" 'noerror 'nomessage)
>     (load "tramp" 'noerror 'nomessage)

Hmm... no I don't think this will make any difference when
default-directory is not under the control of Tramp.

Another approach is to add something like

    ;; Reload `tramp-compat` when we reload `tramp-autoloads`.
    ;;;###autoload (when (featurep 'tramp-compat)
    ;;;###autoload   (load "tramp-compat"'noerror 'nomessage)

This presumes that the only file that really needs to be reloaded is
`tramp-compat`.


    Stefan

bug#48015: 28.0.50; ELPA package compilation fails

[Michael Albinus]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

>> BTW, maybe one option to circumvent both problems is to replace
>>
>>     (load "tramp" 'noerror 'nomessage)
>>
>> with
>>
>>     (load "tramp-compat" 'noerror 'nomessage)
>>     (load "tramp" 'noerror 'nomessage)
>
> Hmm... no I don't think this will make any difference when
> default-directory is not under the control of Tramp.

Well, I have just pushed this change. It seems to help partly. Emacs
27.2 isn't blocked any longer when installing an incompatible Tramp
version, even when default-directory is remote while installing. It
shows just an error message. And after restarting Emacs,
tramp-recompile-elpa does arrange everything. This is a scenario I could
explain to the users :-)

> Another approach is to add something like
>
>     ;; Reload `tramp-compat` when we reload `tramp-autoloads`.
>     ;;;###autoload (when (featurep 'tramp-compat)
>     ;;;###autoload   (load "tramp-compat"'noerror 'nomessage)
>
> This presumes that the only file that really needs to be reloaded is
> `tramp-compat`.

I'll test this tomorrow. It was a hard day ...

>     Stefan

Best regards, Michael.

bug#48015: 28.0.50; ELPA package compilation fails

[Michael Albinus]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

Hi Stefan,

> Hmm... no I don't think this will make any difference when
> default-directory is not under the control of Tramp.
>
> Another approach is to add something like
>
>     ;; Reload `tramp-compat` when we reload `tramp-autoloads`.
>     ;;;###autoload (when (featurep 'tramp-compat)
>     ;;;###autoload   (load "tramp-compat"'noerror 'nomessage)
>
> This presumes that the only file that really needs to be reloaded is
> `tramp-compat`.

This is as good (or bad) like the other proposal. Installing a Tramp
package finishes, and it compiles everything. However, the *.elc files
show still the compatibility problems.

Restarting Emacs, and running tramp-recompile-elpa, fixes this.

>     Stefan

Best regards, Michael.

bug#48015: 28.0.50; ELPA package compilation fails

[Stefan Monnier]

Michael Albinus [2021-04-28 16:22:49] wrote:
> Stefan Monnier <monnier@iro.umontreal.ca> writes:
>> Hmm... no I don't think this will make any difference when
>> default-directory is not under the control of Tramp.
>>
>> Another approach is to add something like
>>
>>     ;; Reload `tramp-compat` when we reload `tramp-autoloads`.
>>     ;;;###autoload (when (featurep 'tramp-compat)
>>     ;;;###autoload   (load "tramp-compat"'noerror 'nomessage)
>>
>> This presumes that the only file that really needs to be reloaded is
>> `tramp-compat`.
>
> This is as good (or bad) like the other proposal. Installing a Tramp
> package finishes, and it compiles everything. However, the *.elc files
> show still the compatibility problems.

Even if you `M-x load-library RET find-func RET` before `package-install`?


        Stefan

bug#48015: 28.0.50; ELPA package compilation fails

[Michael Albinus]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

Hi Stefan,

>> This is as good (or bad) like the other proposal. Installing a Tramp
>> package finishes, and it compiles everything. However, the *.elc files
>> show still the compatibility problems.
>
> Even if you `M-x load-library RET find-func RET` before `package-install`?

I've started

--8<---------------cut here---------------start------------->8---
[albinus@gandalf emacs]$ ~/src/emacs-27/src/emacs -l package -l find-func -f list-packages
--8<---------------cut here---------------end--------------->8---

From there, I've installed the Tramp package. Same situation:
compilation w/o problem, but resulting *.elc have compatibility problems.

>         Stefan

Best regards, Michael.