ffap-bindings incompatible with TRAMP?

ffap-bindings incompatible with TRAMP?

[Bernardo]

It appears that having (ffap-bindings) in .emacs interferes with TRAMP, 
e.g. i can no longer use C-x C-f /su::/etc/somefile to open a file as root.
Would anybody know of a workaround?

TRAMP version 2.1.15
GNU/Linux Emacs 22.3.1

Re: ffap-bindings incompatible with TRAMP?

[Michael Albinus]

Bernardo <bernardo.bacic@pobox.com> writes:

> It appears that having (ffap-bindings) in .emacs interferes with
> TRAMP, e.g. i can no longer use C-x C-f /su::/etc/somefile to open a
> file as root.
> Would anybody know of a workaround?
>
> TRAMP version 2.1.15
> GNU/Linux Emacs 22.3.1

Could you, please, be a little bit more verbose what happens? I cannot
reproduce it here (using GNU Emacs 22.2.1, Tramp 2.1.16-pre). Because of
Ubuntu I've opened "/sudo::/etc/hosts", but this shouldn't make a
difference.

Best regards, Michael.

Re: ffap-bindings incompatible with TRAMP?

[Bernardo]

> It appears that having (ffap-bindings) in .emacs interferes with TRAMP, 
> e.g. i can no longer use C-x C-f /su::/etc/somefile to open a file as root.
> Would anybody know of a workaround?
> 
> TRAMP version 2.1.15
> GNU/Linux Emacs 22.3.1

a few more details (the mail gateway hasn't forwarded Michael's message 
yet, but i can see it on google groups)

1. start Emacs
   $ emacs -Q &

2. open /etc/hosts
   C-x C-f /su::/etc/hosts

3. enter password when prompted
4. the file loads ok
5. quit emacs

-------------------------------------------------
the second scenario:
a. start Emacs
   $ emacs -Q &

b. activate ffap-bindings
   M-: (ffap-bindings)

c. open /etc/hosts [1]
   C-x C-f /su::/etc/hosts

d. there is no prompt for root password although Emacs
    was started from a user's account; the echo area says:
    "Use M-x make-directory RET RET to create directory and its parents"
    The /etc/hosts file isn't loaded.


Regards, Bernardo


[1] while typing, one can see the TRAMP is loading

Re: ffap-bindings incompatible with TRAMP?

[Michael Albinus]

Bernardo <bernardo.bacic@pobox.com> writes:

>> TRAMP version 2.1.15
>> GNU/Linux Emacs 22.3.1

Are you sure Tramp 2.1.15 is loaded with your scenario? After starting
"emacs -Q" you need at least adapt the load-path. Emacs 22 comes with
Tramp 2.0.

> -------------------------------------------------
> the second scenario:
> a. start Emacs
>   $ emacs -Q &
>
> b. activate ffap-bindings
>   M-: (ffap-bindings)
>
> c. open /etc/hosts [1]
>   C-x C-f /su::/etc/hosts
>
> d. there is no prompt for root password although Emacs
>    was started from a user's account; the echo area says:
>    "Use M-x make-directory RET RET to create directory and its parents"
>    The /etc/hosts file isn't loaded.

I have done exactly as said with Emacs 23.0.90 / Tramp 2.1.15. The
only difference is that I have used "sudo" instead of "su" (because of
Ubuntu). I was prompted for the password, and it did run w/o any
problem.

Could you, please, repeat the test? Directly after starting Emacs, you
should apply "M-: (setq tramp-verbose 9)". If the problem happens,
please show the "*tramp/su root@...*" and "*debug tramp/su root@...*"
buffers.

> Regards, Bernardo

Best regards, Michael.

Re: ffap-bindings incompatible with TRAMP?

[Bernardo]

> 
>>> TRAMP version 2.1.15
>>> GNU/Linux Emacs 22.3.1
> 
> Are you sure Tramp 2.1.15 is loaded with your scenario? After starting
> "emacs -Q" you need at least adapt the load-path. Emacs 22 comes with
> Tramp 2.0.

i've installed Tramp 2.1.15 just to confirm the issue is still there;
anyway, M-x tramp-version returns 2.1.15 in both cases

> 
> I have done exactly as said with Emacs 23.0.90 / Tramp 2.1.15. The
> only difference is that I have used "sudo" instead of "su" (because of
> Ubuntu). I was prompted for the password, and it did run w/o any
> problem.
> 
> Could you, please, repeat the test? Directly after starting Emacs, you
> should apply "M-: (setq tramp-verbose 9)". If the problem happens,
> please show the "*tramp/su root@...*" and "*debug tramp/su root@...*"
> buffers.
> 
done so, but there are no TRAMP buffers!
C-x C-b only shows
.   hosts                    0  Fundamental	  /su::/etc/hosts
     *scratch*                0  Lisp Interaction
   * *Messages*             733  Fundamental


BTW shell output:
$ ls -l /etc/hosts
-rw-r--r-- 1 root root 98 2008-12-31 09:03 /etc/hosts


C-h v tramp-verbose shows:
tramp-verbose is a variable defined in `tramp.el'.
Its value is 9


Documentation:
*Verbosity level for Tramp.
Any level x includes messages for all levels 1 .. x-1.  The levels are

  0  silent (no tramp messages at all)
  1  errors
  2  warnings
  3  connection to remote hosts (default level)
  4  activities
  5  internal
  6  sent and received strings
  7  file caching
  8  connection properties
10  traces (huge).

You can customize this variable.


The content of *Messages*
Warning: no fonts matching 
`-*-fixed-medium-r-normal-*-16-*-*-*-*-*-iso8859-1' available [2 times]
Warning: no fonts matching 
`-*-*-medium-r-normal-*-16-*-*-*-*-*-iso8859-1' available
Warning: no fonts matching `-*-*-*-r-normal-*-16-*-*-*-*-*-iso8859-1' 
available
Warning: no fonts matching `-*-*-*-*-normal-*-16-*-*-*-*-*-iso8859-1' 
available
Warning: no fonts matching `-*-*-*-*-*-*-16-*-*-*-*-*-iso8859-1' 
available [2 times]
("emacs" "-Q")
For information about GNU Emacs and the GNU system, type C-h C-a.
9 (#o11, #x9)
Loading ffap...done
(ffap-ro-mode-hook)
Loading tramp... [3 times]
Loading regexp-opt...done
Loading easymenu...done
Loading tramp...done
Use M-x make-directory RET RET to create the directory and its parents


got to go now, will have another look at this test a bit later on;

regards, Bernardo

Re: ffap-bindings incompatible with TRAMP?

[Michael Albinus]

Bernardo <bernardo.bacic@pobox.com> writes:

> done so, but there are no TRAMP buffers!
> C-x C-b only shows
> .   hosts                    0  Fundamental	  /su::/etc/hosts
>     *scratch*                0  Lisp Interaction
>   * *Messages*             733  Fundamental

OK, that's clear now. ffap-bindings changes file-name-handler-alist,
that's why Tramp is not recognized.

I've checked ffap.el in CVS. Version 1.62.2.5, which comes with Emacs
22.3, does indeed suspicious file-name-handler-alist manipulations.

Version 1.82, bundled with recent Emacs 23.0.90/91, has changed that
code with respect to this problem. There is the following comment:

        ;; Remove the special handler manually.  We used to just let-bind
        ;; file-name-handler-alist to preserve its value, but that caused
        ;; other modifications to be lost (e.g. when Tramp gets loaded
        ;; during the completing-read call).

That's why I couldn't reproduce your problem with Emacs 23.0.90. I
don't believe that there will be an Emacs 22.4, so you must wait for
Emacs 23 (or you participate in the beta test: Emacs 23.0.91 was
announced yesterday).

> regards, Bernardo

Best regards, Michael.

Re: ffap-bindings incompatible with TRAMP?

[Bernardo]

Michael Albinus said the following on 26/02/09 22:39:
> Bernardo <bernardo.bacic@pobox.com> writes:
> 
>> done so, but there are no TRAMP buffers!
>> C-x C-b only shows
>> .   hosts                    0  Fundamental	  /su::/etc/hosts
>>     *scratch*                0  Lisp Interaction
>>   * *Messages*             733  Fundamental
> 
> OK, that's clear now. ffap-bindings changes file-name-handler-alist,
> that's why Tramp is not recognized.
> 
> I've checked ffap.el in CVS. Version 1.62.2.5, which comes with Emacs
> 22.3, does indeed suspicious file-name-handler-alist manipulations.
> 
> Version 1.82, bundled with recent Emacs 23.0.90/91, has changed that
> code with respect to this problem. There is the following comment:
> 
>         ;; Remove the special handler manually.  We used to just let-bind
>         ;; file-name-handler-alist to preserve its value, but that caused
>         ;; other modifications to be lost (e.g. when Tramp gets loaded
>         ;; during the completing-read call).
> 
> That's why I couldn't reproduce your problem with Emacs 23.0.90. I
> don't believe that there will be an Emacs 22.4, so you must wait for
> Emacs 23 (or you participate in the beta test: Emacs 23.0.91 was
> announced yesterday).
> 
>> regards, Bernardo
> 
> Best regards, Michael.

looks like i've procrastinated with v23.x upgrade for too long, will 
give it a try in next few days; thanks for your help

rgds, Bernardo