[Emacs 26] Possible bug with TRAMP accessing some files when using hops

[Emacs 26] Possible bug with TRAMP accessing some files when using hops

[Nicolas Petton]

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Hi,

Before I report a bug for Emacs 26, I want to confirm an issue.

I started using hops recently to access remote files as root (using
sudo), like the following:

  C-x C-f /ssh:me@example.com|sudo:localhost:/etc/deluser.conf

It works fine most of the times, but sometimes I end up with an empty
buffer.

This always happens with the same files, like /etc/deluser.conf on a
clean debian stretch (/etc/hosts works fine for instance).

I cannot see any obvious reason like file permissions or attributes, so
the issue is really puzzling me.

I have tested this with the latest commit on the emacs-26 branch on two
different machines, with two different remote hosts (both debian stretch
though).

Cheers,
Nico

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Re: [Emacs 26] Possible bug with TRAMP accessing some files when using hops

[Michael Albinus]

Nicolas Petton <nicolas@petton.fr> writes:

> Hi,

Hi Nico,

> Before I report a bug for Emacs 26, I want to confirm an issue.

Wouldn't be a problem for me. Closing bugs as not-a-bug is so easy, in
case of :-)

> I started using hops recently to access remote files as root (using
> sudo), like the following:
>
>   C-x C-f /ssh:me@example.com|sudo:localhost:/etc/deluser.conf

I don't know whether it is related, but the second host name shall be
the same like the first one. Something like
/ssh:me@example.com|sudo:example.com:/etc/deluser.conf

> It works fine most of the times, but sometimes I end up with an empty
> buffer.
>
> This always happens with the same files, like /etc/deluser.conf on a
> clean debian stretch (/etc/hosts works fine for instance).
>
> I cannot see any obvious reason like file permissions or attributes, so
> the issue is really puzzling me.
>
> I have tested this with the latest commit on the emacs-26 branch on two
> different machines, with two different remote hosts (both debian stretch
> though).

Pls set tramp-verbose to 6, and send the Tramp debug buffer once it
failed. In case of confidentiality problems, send it just to me (if possible).

> Cheers,
> Nico

Best regards, Michael.

Re: [Emacs 26] Possible bug with TRAMP accessing some files when using hops

[Nicolas Petton]

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Michael Albinus <michael.albinus@gmx.de> writes:


>> Before I report a bug for Emacs 26, I want to confirm an issue.
>
> Wouldn't be a problem for me. Closing bugs as not-a-bug is so easy, in
> case of :-)

You're right, but I was skeptical and guessed the issue came from me
(which seems to be the case).

>>   C-x C-f /ssh:me@example.com|sudo:localhost:/etc/deluser.conf
>
> I don't know whether it is related, but the second host name shall be
> the same like the first one. Something like
> /ssh:me@example.com|sudo:example.com:/etc/deluser.conf

Thanks, that fixes the issue.  However now I'm wondering why for some
files it works with the second host being "sudo:localhost".

I'll set tramp-verbose to 6 to see what actually happens.

Cheers,
Nico

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Re: [Emacs 26] Possible bug with TRAMP accessing some files when using hops

[Michael Albinus]

Nicolas Petton <nicolas@petton.fr> writes:

>>>   C-x C-f /ssh:me@example.com|sudo:localhost:/etc/deluser.conf
>>
>> I don't know whether it is related, but the second host name shall be
>> the same like the first one. Something like
>> /ssh:me@example.com|sudo:example.com:/etc/deluser.conf
>
> Thanks, that fixes the issue.  However now I'm wondering why for some
> files it works with the second host being "sudo:localhost".

That's an inconsistency in Tramp which I've planned several times to
fix, but there were always more important issues to solve.

A bug might trigger me to do this, finally :-)

> I'll set tramp-verbose to 6 to see what actually happens.

Pls do.

> Cheers,
> Nico

Best regards, Michael.

Re: [Emacs 26] Possible bug with TRAMP accessing some files when using hops

[Nicolas Petton]

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Michael Albinus <michael.albinus@gmx.de> writes:

> A bug might trigger me to do this, finally :-)

I made a bug report ;)

Cheers,
Nico

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