Re: "Tramp failed to connect" to an ssh server (gpg as an ssh agent)

Daniel Krajnik <[email protected]> Sat, 9 Sep 2023 12:28:16 +0100

Newsgroups	gmane.emacs.tramp
Message-ID	<[email protected]>

 > check where Tramp is started from, by 'M-x locate-library RET tramp'.

Thank you, this confirmed that the tramp version is shipped by the emacs 
system pacakge (/usr/share/emacs/29.1/lisp/net/tramp.elc) and not the 
doom framework (~/.config/emacs) like I originally thought (I might have 
looked at the "other versions" field in the "doom/help-packages" buffer 
by mistake).

> sign_and_send_pubkey: signing failed for ED25519 "cardno:000F73AE79E9" 
from agent: agent refused operation

I've switched temporarily back to pinentry (non-gtk) version and run 
tramp in emacs -Q. Log at level 10 and backtrace attached. It yielded 
the same error (quoted above) as on the terminal. GTK3 version pinentry 
still works fine though (both on emacs -Q and doom).

On 09/09/2023 08:37, Michael Albinus wrote:
> Daniel Krajnik<[email protected]>  writes:
>
> Hi Daniel,
>
>> Thank you, I've upgraded doom's packages to the latest version, which
>> bumped tramp up to version 2.6.1.1.
>>
>> I've tried looking for a way to upgrade it to 2.6.1.2 (package is
>> managed by straight.el and doom's documentation doesn't mention that
>> you can use release number instead of the hash commit), but this broke
>> emacs and I had to revert back (thankfully all is backed by btrfs'
>> snapshots).
> Well, the difference between 2.6.1.1 and 2.6.1.2 is small. If you have
> 2.6.1.1 it would be OK.
>
>> After restarting emacs daemon, I've tried to connect again (thinking
>> that it's on version 2.6.1.1) and initially this time it worked.
>>
>> It did however produce the same backtrace errors, which revealed that
>> tramp is still on version 2.6.0.29.1.
> You can check the Tramp version by 'C-h v tramp-version'. You can also
> check where Tramp is started from, by 'M-x locate-library RET tramp'.
>
>>> It is the "prompting PIN" text I'm interested in.
>> Because, ~/.gnupg/gpg-agent.conf was configured to use
>>
>> pinentry-program /usr/bin/pinentry-gnome3
>>
>> gtk3 for pinentry (it's necessary when working with gpg in
>> thunderbird) there was not output in the terminal - just the typical
>> graphical window appears and login succeeds.
> I see. In this case, Tramp is not involved, and I don't need to see
> anything :-)
>
>> Interestingly though if you change it to /usr/bin/pinentry (and
>> restart gpg-agent) it fails:
>>
>> sign_and_send_pubkey: signing failed for ED25519 "cardno:000F
>> 73AE79E9" from agent: agent refused operation
>>
>> I'm not sure why though?
> Again, show the debug buffer produced with tramp-verbose 10.
>
> Best regards, Michael.

backtrace (text/plain, 1.9 KB)

  backtrace()
  tramp-error(nil file-error "Tramp failed to connect.  If this happens repeated...")
  tramp-signal-hook-function(file-error ("Tramp failed to connect.  If this happens repeated..."))
  signal(file-error ("Tramp failed to connect.  If this happens repeated..."))
  tramp-maybe-open-connection((tramp-file-name "ssh" "user1" nil "128.40.123.56" nil "" nil))
  tramp-send-command((tramp-file-name "ssh" "user1" nil "128.40.123.56" nil "" nil) "echo ~ 2>/dev/null; echo tramp_exit_status $?")
  tramp-send-command-and-check((tramp-file-name "ssh" "user1" nil "128.40.123.56" nil "" nil) "echo ~")
  tramp-sh-handle-get-home-directory((tramp-file-name "ssh" "user1" nil "128.40.123.56" nil "" nil) "")
  apply(tramp-sh-handle-get-home-directory ((tramp-file-name "ssh" "user1" nil "128.40.123.56" nil "" nil) ""))
  tramp-sh-file-name-handler(tramp-get-home-directory (tramp-file-name "ssh" "user1" nil "128.40.123.56" nil "" nil) "")
  apply(tramp-sh-file-name-handler tramp-get-home-directory ((tramp-file-name "ssh" "user1" nil "128.40.123.56" nil "" nil) ""))
  tramp-file-name-handler(tramp-get-home-directory (tramp-file-name "ssh" "user1" nil "128.40.123.56" nil "" nil) "")
  tramp-get-home-directory((tramp-file-name "ssh" "user1" nil "128.40.123.56" nil "" nil) "")
  tramp-sh-handle-expand-file-name("/ssh:[email protected]:" nil)
  apply(tramp-sh-handle-expand-file-name ("/ssh:[email protected]:" nil))
  tramp-sh-file-name-handler(expand-file-name "/ssh:[email protected]:" nil)
  apply(tramp-sh-file-name-handler expand-file-name ("/ssh:[email protected]:" nil))
  tramp-file-name-handler(expand-file-name "/ssh:[email protected]:" nil)
  expand-file-name("/ssh:[email protected]:")
  find-file-noselect("/ssh:[email protected]:" nil nil t)
  find-file("/ssh:[email protected]:" t)
  funcall-interactively(find-file "/ssh:[email protected]:" t)
  call-interactively(find-file nil nil)
  command-execute(find-file)

debug tramp-ssh [email protected] (text/plain, 32.6 KB) - not displayed

OpenPGP_0xCFC60FFCAAEC3A7D.asc (application/pgp-keys, 1.3 KB)

OpenPGP_signature.asc (application/pgp-signature, 228 B)