bug#67704: 30.0.50; Emacs hangs indefinitely when writing GPG-encrypted file

bug#67704: 30.0.50; Emacs hangs indefinitely when writing GPG-encrypted file

[Tassilo Horn]

I have several GPG-encrypted files such as ~/.authinfo.gpg which I use
as auth-source.  I can still open them fine where I get a pinentry
dialog the first time until the password is cached in the gpg-agent.
However, I cannot save/write such files from emacs anymore which used to
work flawlessly for many years.

When I try to save, emacs just seems to hang indefinitely.  Setting
debug-on-quit and then C-g-ing reveals it hangs in there (emacs -Q):

--8<---------------cut here---------------start------------->8---
Debugger entered--Lisp error: (quit)
  epg-wait-for-status(#s(epg-context :protocol OpenPGP :program "/usr/bin/gpg2" :home-directory nil :armor nil :textmode nil :include-certs nil :cipher-algorithm nil :digest-algorithm nil :compress-algorithm nil :passphrase-callback (epa-file-passphrase-callback-function . "/home/horn/Repos/configs/dot-authinfo.gpg") :progress-callback (epa-progress-callback-function . "Encrypting /home/horn/Repos/configs/dot-authinfo.gpg") :edit-callback nil :signers nil :sender nil :sig-notations nil :process #<process epg> :output-file "/tmp/epg-outputxL3w1m" :result nil :operation encrypt :pinentry-mode nil :error-output "" :error-buffer #<buffer  *epg-error*>) ("BEGIN_ENCRYPTION"))
  epg-start-encrypt(#s(epg-context :protocol OpenPGP :program "/usr/bin/gpg2" :home-directory nil :armor nil :textmode nil :include-certs nil :cipher-algorithm nil :digest-algorithm nil :compress-algorithm nil :passphrase-callback (epa-file-passphrase-callback-function . "/home/horn/Repos/configs/dot-authinfo.gpg") :progress-callback (epa-progress-callback-function . "Encrypting /home/horn/Repos/configs/dot-authinfo.gpg") :edit-callback nil :signers nil :sender nil :sig-notations nil :process #<process epg> :output-file "/tmp/epg-outputxL3w1m" :result nil :operation encrypt :pinentry-mode nil :error-output "" :error-buffer #<buffer  *epg-error*>) #s(epg-data :file nil :string "...") (#s(epg-key :owner-trust ultimate :sub-key-list (#s(epg-sub-key :validity ultimate :capability (sign certify) :secret-p nil :algorithm 1 :length 4096 :id "..." :creation-time 1474387910 :expiration-time nil :fingerprint "...") #s(epg-sub-key :validity ultimate :capability (encrypt) :secret-p nil :algorithm 1 :length 4096 :id "..." :creation-time 1474387910 :expiration-time nil :fingerprint "...")) :user-id-list (#s(epg-user-id :validity ultimate :string "Tassilo Horn <tsdh@gnu.org>" :signature-list nil) #s(epg-user-id :validity ultimate :string "Tassilo Horn <tassilo@member.fsf.org>" :signature-list nil) #s(epg-user-id :validity ultimate :string "Tassilo Horn <xxx@gmail.com>" :signature-list nil) #s(epg-user-id :validity ultimate :string "Tassilo Horn <xxx@fastmail.fm>" :signature-list nil) #s(epg-user-id :validity ultimate :string "Tassilo Horn <xxx@uni-koblenz.de>" :signature-list nil)))) nil nil)
  epg-encrypt-string(#s(epg-context :protocol OpenPGP :program "/usr/bin/gpg2" :home-directory nil :armor nil :textmode nil :include-certs nil :cipher-algorithm nil :digest-algorithm nil :compress-algorithm nil :passphrase-callback (epa-file-passphrase-callback-function . "/home/horn/Repos/configs/dot-authinfo.gpg") :progress-callback (epa-progress-callback-function . "Encrypting /home/horn/Repos/configs/dot-authinfo.gpg") :edit-callback nil :signers nil :sender nil :sig-notations nil :process #<process epg> :output-file "/tmp/epg-outputxL3w1m" :result nil :operation encrypt :pinentry-mode nil :error-output "" :error-buffer #<buffer  *epg-error*>) "..." (#s(epg-key :owner-trust ultimate :sub-key-list (#s(epg-sub-key :validity ultimate :capability (sign certify) :secret-p nil :algorithm 1 :length 4096 :id "..." :creation-time 1474387910 :expiration-time nil :fingerprint "...") #s(epg-sub-key :validity ultimate :capability (encrypt) :secret-p nil :algorithm 1 :length 4096 :id "..." :creation-time 1474387910 :expiration-time nil :fingerprint "...")) :user-id-list (#s(epg-user-id :validity ultimate :string "Tassilo Horn <tsdh@gnu.org>" :signature-list nil) #s(epg-user-id :validity ultimate :string "Tassilo Horn <tassilo@member.fsf.org>" :signature-list nil) #s(epg-user-id :validity ultimate :string "Tassilo Horn <xxx@gmail.com>" :signature-list nil) #s(epg-user-id :validity ultimate :string "Tassilo Horn <xxx@fastmail.fm>" :signature-list nil) #s(epg-user-id :validity ultimate :string "Tassilo Horn <xxx@uni-koblenz.de>" :signature-list nil)))))
  epa-file-write-region(nil nil "/home/horn/Repos/configs/dot-authinfo.gpg" nil t "~/Repos/configs/dot-authinfo.gpg" nil)
  epa-file-handler(write-region nil nil "/home/horn/Repos/configs/dot-authinfo.gpg" nil t "~/Repos/configs/dot-authinfo.gpg" nil)
  write-region(nil nil "/home/horn/Repos/configs/dot-authinfo.gpg" nil t "~/Repos/configs/dot-authinfo.gpg")
  basic-save-buffer-2()
  basic-save-buffer-1()
  basic-save-buffer(t)
  save-buffer(1)
  funcall-interactively(save-buffer 1)
  command-execute(save-buffer)
--8<---------------cut here---------------end--------------->8---

There's a gpg2 process started like that:

  /usr/bin/gpg2 --no-tty --status-fd 1 --yes --enable-progress-filter \
                --command-fd 0 --output /tmp/epg-outputxL3w1m \
                --encrypt -r <MY_GPG_KEY_ID>

When I perform that command (with a different --output file) on the
command line, it says

--8<---------------cut here---------------start------------->8---
[GNUPG:] KEY_CONSIDERED 0F1D0793E6C7D8A5DA026F1373292E404EDE1CF4 0

--8<---------------cut here---------------end--------------->8---

and I can type text and then hit C-d where it will say

--8<---------------cut here---------------start------------->8---
[GNUPG:] PROGRESS stdin ? 0 0 B
[GNUPG:] BEGIN_ENCRYPTION 2 9
[GNUPG:] PROGRESS stdin ? 21 0 B
[GNUPG:] END_ENCRYPTION
--8<---------------cut here---------------end--------------->8---

and write the text I entered to the encrypted --output file.  So it
looks like emacs doesn't do the equivalent of sending the "I am finished
entering text" code which the key C-d on the shell does.

The above was with the current emacs master.  With the released version
29.1 as provided by my distro, I have the same issue, however the
backtrace looks a bit different (a accept-process-output on top):

Debugger entered--Lisp error: (quit)
  accept-process-output(#<process epg> 1)
  epg-wait-for-status(#s(...) ("BEGIN_ENCRYPTION"))
  epg-start-encrypt(...)
  epg-encrypt-string(...)
  epa-file-write-region(nil nil "/home/horn/Repos/configs/dot-authinfo.gpg" nil t "~/Repos/configs/dot-authinfo.gpg" nil)
  apply(epa-file-write-region (nil nil "/home/horn/Repos/configs/dot-authinfo.gpg" nil t "~/Repos/configs/dot-authinfo.gpg" nil))
  epa-file-handler(write-region nil nil "/home/horn/Repos/configs/dot-authinfo.gpg" nil t "~/Repos/configs/dot-authinfo.gpg" nil)
  write-region(nil nil "/home/horn/Repos/configs/dot-authinfo.gpg" nil t "~/Repos/configs/dot-authinfo.gpg")
  basic-save-buffer-2()
  basic-save-buffer-1()
  basic-save-buffer(t)
  save-buffer(1)
  funcall-interactively(save-buffer 1)
  call-interactively(save-buffer nil nil)
  command-execute(save-buffer)

The GnuPG version is 2.4.3.

I cannot say when the issue started appearing.  I frequently read those
files (which still works) but seldomly need to change them.  So it's
possible it's broken since several weeks.  Or maybe it's not caused by
emacs but the gpg2 interface changed?  Oh yeah, that could be likely.
My package manager log says

  [2023-12-04T08:32:29+0100] [ALPM] upgraded gnupg (2.2.41-2 -> 2.4.3-2)

so there was a minor version upgrade on December, 4th.  Maybe emacs is
not yet ready for GnuPG 2.4.x?


In GNU Emacs 30.0.50 (build 24, x86_64-pc-linux-gnu, GTK+ Version
 3.24.38, cairo version 1.18.0) of 2023-12-08 built on thinkpad-t440p
Repository revision: 3cf7d32b90ad32321c141bb2a34a670d2d6df5b7
Repository branch: master
System Description: Arch Linux

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bug#67704: 30.0.50; Emacs hangs indefinitely when writing GPG-encrypted file

[Eli Zaretskii]

> From: Tassilo Horn <tsdh@gnu.org>
> Date: Fri, 08 Dec 2023 07:49:13 +0100
> 
> 
> I have several GPG-encrypted files such as ~/.authinfo.gpg which I use
> as auth-source.  I can still open them fine where I get a pinentry
> dialog the first time until the password is cached in the gpg-agent.
> However, I cannot save/write such files from emacs anymore which used to
> work flawlessly for many years.
> 
> When I try to save, emacs just seems to hang indefinitely.  Setting
> debug-on-quit and then C-g-ing reveals it hangs in there (emacs -Q):

Isn't this the problem with GnuPG described in PROBLEMS under "Saving
a file encrypted with GnuPG via EasyPG hangs"?

bug#67704: 30.0.50; Emacs hangs indefinitely when writing GPG-encrypted file

[Eli Zaretskii]

> From: Tassilo Horn <tsdh@gnu.org>
> Date: Fri, 08 Dec 2023 08:13:54 +0100
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> >> When I try to save, emacs just seems to hang indefinitely.  Setting
> >> debug-on-quit and then C-g-ing reveals it hangs in there (emacs -Q):
> >
> > Isn't this the problem with GnuPG described in PROBLEMS under "Saving
> > a file encrypted with GnuPG via EasyPG hangs"?
> 
> Oh, indeed, it is.  Thanks for the pointer.

OK, so I'm closing this bug.

bug#67704: 30.0.50; Emacs hangs indefinitely when writing GPG-encrypted file

[Manuel Giraud via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Tassilo Horn <tsdh@gnu.org>
>> Date: Fri, 08 Dec 2023 07:49:13 +0100
>> 
>> 
>> I have several GPG-encrypted files such as ~/.authinfo.gpg which I use
>> as auth-source.  I can still open them fine where I get a pinentry
>> dialog the first time until the password is cached in the gpg-agent.
>> However, I cannot save/write such files from emacs anymore which used to
>> work flawlessly for many years.
>> 
>> When I try to save, emacs just seems to hang indefinitely.  Setting
>> debug-on-quit and then C-g-ing reveals it hangs in there (emacs -Q):
>
> Isn't this the problem with GnuPG described in PROBLEMS under "Saving
> a file encrypted with GnuPG via EasyPG hangs"?

Hi,

FWIW, I also observe this bug and I have gnupg-2.4.3…  So maybe we'll
have to fix this in Emacs.
-- 
Manuel Giraud

bug#67704: 30.0.50; Emacs hangs indefinitely when writing GPG-encrypted file

[Eli Zaretskii]

> From: Manuel Giraud <manuel@ledu-giraud.fr>
> Cc: Tassilo Horn <tsdh@gnu.org>,  67704@debbugs.gnu.org
> Date: Fri, 08 Dec 2023 09:11:22 +0100
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > Isn't this the problem with GnuPG described in PROBLEMS under "Saving
> > a file encrypted with GnuPG via EasyPG hangs"?
> 
> Hi,
> 
> FWIW, I also observe this bug and I have gnupg-2.4.3…  So maybe we'll
> have to fix this in Emacs.

You are saying that GnuPG 2.4.3 solved the problem on their side?

If GnuPG still behaves like 2.4.1 did, why would you expect us to
solve this?  Why didn't GnuPG folks solve this in GnuPG?  I thought at
the time they were discussing solutions that would not need any
changes in Emacs?

bug#67704: 30.0.50; Emacs hangs indefinitely when writing GPG-encrypted file

[Tassilo Horn]

Eli Zaretskii <eliz@gnu.org> writes:

> You are saying that GnuPG 2.4.3 solved the problem on their side?

For all folks interested, that seems to be the gnupg issue:

  https://dev.gnupg.org/T6481

It seems this issue has been fixed on November, 17th.  But probably it's
not yet in any released version, I guess.  2.4.3 was relealed in July.

Bye,
Tassilo

bug#67704: 30.0.50; Emacs hangs indefinitely when writing GPG-encrypted file

[Eli Zaretskii]

> From: Tassilo Horn <tsdh@gnu.org>
> Cc: Manuel Giraud <manuel@ledu-giraud.fr>,  67704@debbugs.gnu.org
> Date: Fri, 08 Dec 2023 09:59:29 +0100
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > You are saying that GnuPG 2.4.3 solved the problem on their side?
> 
> For all folks interested, that seems to be the gnupg issue:
> 
>   https://dev.gnupg.org/T6481
> 
> It seems this issue has been fixed on November, 17th.  But probably it's
> not yet in any released version, I guess.  2.4.3 was relealed in July.

Thanks.

When such a fixed version of GnuPG is released, we will need to update
that PROBLEMS entry.  So when anyone sees such a released version in
the wild, please speak up.

bug#67704: 30.0.50; Emacs hangs indefinitely when writing GPG-encrypted file

[Manuel Giraud via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Manuel Giraud <manuel@ledu-giraud.fr>
>> Cc: Tassilo Horn <tsdh@gnu.org>,  67704@debbugs.gnu.org
>> Date: Fri, 08 Dec 2023 09:11:22 +0100
>> 
>> Eli Zaretskii <eliz@gnu.org> writes:
>> 
>> > Isn't this the problem with GnuPG described in PROBLEMS under "Saving
>> > a file encrypted with GnuPG via EasyPG hangs"?
>> 
>> Hi,
>> 
>> FWIW, I also observe this bug and I have gnupg-2.4.3…  So maybe we'll
>> have to fix this in Emacs.
>
> You are saying that GnuPG 2.4.3 solved the problem on their side?

No, I am saying that 2.4.3 still shows this issue (for me).  So I guess
that it calls for a solution on our side.

> If GnuPG still behaves like 2.4.1 did, why would you expect us to
> solve this?  Why didn't GnuPG folks solve this in GnuPG?  I thought at
> the time they were discussing solutions that would not need any
> changes in Emacs?

Ok, I was not aware of this discussion.
-- 
Manuel Giraud

bug#67704: 30.0.50; Emacs hangs indefinitely when writing GPG-encrypted file

[Manuel Giraud via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Tassilo Horn <tsdh@gnu.org> writes:

> Eli Zaretskii <eliz@gnu.org> writes:
>
>> You are saying that GnuPG 2.4.3 solved the problem on their side?
>
> For all folks interested, that seems to be the gnupg issue:
>
>   https://dev.gnupg.org/T6481
>
> It seems this issue has been fixed on November, 17th.  But probably it's
> not yet in any released version, I guess.  2.4.3 was relealed in July.

Wow thanks!  So everything was discussed even "epg.el" modifications…
but it is good if they fixed it on their side.  We'd have to wait for a
new release then.
-- 
Manuel Giraud