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bug#39489: 28.0.50; On Emacs 27, 28, tramp hangs indefinitely


From: Benjamin Slade
Subject: bug#39489: 28.0.50; On Emacs 27, 28, tramp hangs indefinitely
Date: Sat, 08 Feb 2020 14:04:28 -0700

Hi Michael,

Thanks for following up on this. (It is most perplexing to me.)

On 2020-02-08T02:31:40-0700, Michael Albinus <address@hidden> wrote:

> Like you, I believe it is a problem with auth-sources.el. I > suppose you have only one file, ~/.authinfo.gpg? And you don't > have neither ~/.authinfo nor ./netrc? What is the value of > auth-sources?

I have a =~/.authinfo.gpg= file (with contents). There is no =~/.authinfo= file. There *is* a =~/.netrc= file, but it's empty.

For my regular configuration, the value of =auth-sources= is:

--8<---------------cut here---------------start------------->8---
("~/.authinfo.gpg")
--8<---------------cut here---------------end--------------->8---

For =emacs -q -l tramp-sh=, the value of =auth-sources= is:

--8<---------------cut here---------------start------------->8---
("~/.authinfo" "~/.authinfo.gpg" "~/.netrc")
--8<---------------cut here---------------end--------------->8---


> Could you please run the following test:

> --8<---------------cut > here---------------start------------->8---
> # emacs -q -l tramp-sh
> --8<---------------cut > here---------------end--------------->8---

Since you specify `#`, I ran as root first, and then also as my regular user.

> In Emacs, please evaluate

> --8<---------------cut > here---------------start------------->8---
> (progn
>   (dolist (elt (cons "auth-source-search"
> (all-completions "tramp-" obarray > 'functionp)))
>     (trace-function-background (intern elt)))
>   (setq auth-source-debug 'trivia))
> --8<---------------cut > here---------------end--------------->8---

> After that, pls apply

> --8<---------------cut > here---------------start------------->8---
> C-x C-f /sudo:: ;; Cancel it with C-g if necessary
> M-x untrace-all
> --8<---------------cut > here---------------end--------------->8---

> There will be a new buffer *trace-output*, which I would like > to see. > I would also like to see your *Messages* buffer, with the > traces from > auth-sources.el. Pls send them as attachment, in order to keep > the line
> breaks.

I did the above both as root and as my regular user. I attach the results of both.

> *** ATTENTION ***

> The *trace-output* buffer might contain your password, as > result of the
> function tramp-read-passwd, and in obfuscated form as result of
> auth-source-search. You should overwrite these strings with > "xxx" or
> alike.

I could find no evidence of any of my passwords in this output.


with many thanks,
  —Ben

--
( Dr Benjamin Slade . address@hidden . https://lambda-y.net )
( Linguistics . University of Utah . https://linguistics.utah.edu )
( office : LNCO 2309 )
`( pgp_fp: ,(21BA 2AE1 28F6 DF36 110A 0E9C A320 BBE8 2B52 EE19))
'( sent by mu4e in Emacs on GNU/Linux . https://gnu.org )

Attachment: regularuser.tramp.txt
Description: Text document

Attachment: root.tramp.txt
Description: Text document


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