bug#41496: 28.0.50; When accessing sshd via Tramp via Termux on Android: File error: Couldn't find a proper `ls' command

bug#41496: 28.0.50; When accessing sshd via Tramp via Termux on Android: File error: Couldn't find a proper `ls' command

[Jean Louis]

I am trying to use Tramp to access Termux on Android/Replicant, by using
this command:

/ssh:192.168.43.1#8022:/storage/emulated/0/

Yet I get faced with the error:

File error: Couldn't find a proper `ls' command

I have installed there "ls" command from coreutils, and I tried these
checks:

ls -lnd /
drwxr-xr-x 20 0 0 0 Feb  6  1970 /

ls --color=never -al /dev/null
crw-rw-rw- 1 root root 1, 3 Feb  6  1970 /dev/null

$ which ls
/data/data/com.termux/files/usr/bin/ls

Thus ls is there and is working so far, it is from coreutils, not from
busybox. The busybox version did not work.

The ssh connection from terminal works just fine, including the sftp
connection. 

It would be nice to be able to access Android/Replicant devices over
sshd by using Tramp.


In GNU Emacs 28.0.50 (build 9, x86_64-pc-linux-gnu, X toolkit, cairo version 1.14.8, Xaw3d scroll bars)
 of 2020-05-07 built on protected.rcdrun.com
Repository revision: b2581eea1be1468a15927be00ba2f3f399af33a1
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.11907000
System Description: Hyperbola GNU/Linux-libre

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.

Configured using:
 'configure --prefix=/package/text/emacs-2020-05-07 --with-modules
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LCMS2 GMP

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Memory information:
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-- 
Thanks,
Jean Louis

bug#41496: 28.0.50; When accessing sshd via Tramp via Termux on Android: File error: Couldn't find a proper `ls' command

[Michael Albinus]

Jean Louis <bugs@gnu.support> writes:

Hi,

> $ which ls
> /data/data/com.termux/files/usr/bin/ls
>
> Thus ls is there and is working so far, it is from coreutils, not from
> busybox. The busybox version did not work.

I guess you need to add that directory to your remote PATH. See variable
`tramp-remote-path'.

Best regards, Michael.

bug#41496: 28.0.50; When accessing sshd via Tramp via Termux on Android: File error: Couldn't find a proper `ls' command

[Jean Louis]

* Michael Albinus <michael.albinus@gmx.de> [2020-05-24 11:49]:
> Jean Louis <bugs@gnu.support> writes:
> 
> Hi,
> 
> > $ which ls
> > /data/data/com.termux/files/usr/bin/ls
> >
> > Thus ls is there and is working so far, it is from coreutils, not from
> > busybox. The busybox version did not work.
> 
> I guess you need to add that directory to your remote PATH. See variable
> `tramp-remote-path'.

Thank you, I did change that, and I still get the same error.

If I start emacs -Q, then I can login, it works well, provided I have
changed that path.

Do you know maybe how can I debug that? I need my Emacs settings and
with it, I get this same error.

I have no other options set for tramp, and still same error.

Jean

tramp-remote-path is a variable defined in ‘tramp-sh.el’.
Its value is
(tramp-default-remote-path "/bin" "/usr/bin" "/sbin" "/usr/sbin" "/usr/local/bin" "/usr/local/sbin" "/local/bin" "/local/freeware/bin" "/local/gnu/bin" "/usr/freeware/bin" "/usr/pkg/bin" "/usr/contrib/bin" "/opt/bin" "/opt/sbin" "/opt/local/bin" "/data/data/com.termux/files/usr/bin")
Original value was 
(tramp-default-remote-path "/bin" "/usr/bin" "/sbin" "/usr/sbin" "/usr/local/bin" "/usr/local/sbin" "/local/bin" "/local/freeware/bin" "/local/gnu/bin" "/usr/freeware/bin" "/usr/pkg/bin" "/usr/contrib/bin" "/opt/bin" "/opt/sbin" "/opt/local/bin")

bug#41496: 28.0.50; When accessing sshd via Tramp via Termux on Android: File error: Couldn't find a proper `ls' command

[Michael Albinus]

Jean Louis <bugs@gnu.support> writes:

Hi Jean,
 
>> I guess you need to add that directory to your remote PATH. See variable
>> `tramp-remote-path'.
>
> Thank you, I did change that, and I still get the same error.
>
> If I start emacs -Q, then I can login, it works well, provided I have
> changed that path.
>
> Do you know maybe how can I debug that? I need my Emacs settings and
> with it, I get this same error.

Usually, you should bisect your ~/.emacs. That is, comment half of the
settings, and check whether it works.

If it works, you know the problem is in the commented part, which you
can bisect, again.

If it doesn't work, comment the other part of your ~/.emacs, and check
again. And so on, until you know the problematic setting in your ~/.emacs.

> tramp-remote-path is a variable defined in ‘tramp-sh.el’.
> Its value is
> (tramp-default-remote-path "/bin" "/usr/bin" "/sbin" "/usr/sbin"
> "/usr/local/bin" "/usr/local/sbin" "/local/bin" "/local/freeware/bin"
> "/local/gnu/bin" "/usr/freeware/bin" "/usr/pkg/bin" "/usr/contrib/bin"
> "/opt/bin" "/opt/sbin" "/opt/local/bin"
> "/data/data/com.termux/files/usr/bin")

Maybe it is better to move "/data/data/com.termux/files/usr/bin to the
begin of that list?

> Jean

Best regards, Michael.

bug#41496: 28.0.50; When accessing sshd via Tramp via Termux on Android: File error: Couldn't find a proper `ls' command

[Jean Louis]

Hello Michael,

Thanks for helping.

* Michael Albinus <michael.albinus@gmx.de> [2020-05-24 17:59]:
> Jean Louis <bugs@gnu.support> writes:
> 
> Hi Jean,
>  
> >> I guess you need to add that directory to your remote PATH. See variable
> >> `tramp-remote-path'.
> >
> > Thank you, I did change that, and I still get the same error.
> >
> > If I start emacs -Q, then I can login, it works well, provided I have
> > changed that path.
> >
> > Do you know maybe how can I debug that? I need my Emacs settings and
> > with it, I get this same error.
> 
> Usually, you should bisect your ~/.emacs. That is, comment half of the
> settings, and check whether it works.
> 
> If it works, you know the problem is in the commented part, which you
> can bisect, again.
> 
> If it doesn't work, comment the other part of your ~/.emacs, and check
> again. And so on, until you know the problematic setting in your ~/.emacs.
> 
> > tramp-remote-path is a variable defined in ‘tramp-sh.el’.
> > Its value is
> > (tramp-default-remote-path "/bin" "/usr/bin" "/sbin" "/usr/sbin"
> > "/usr/local/bin" "/usr/local/sbin" "/local/bin" "/local/freeware/bin"
> > "/local/gnu/bin" "/usr/freeware/bin" "/usr/pkg/bin" "/usr/contrib/bin"
> > "/opt/bin" "/opt/sbin" "/opt/local/bin"
> > "/data/data/com.termux/files/usr/bin")
> 
> Maybe it is better to move "/data/data/com.termux/files/usr/bin to the
> begin of that list?

That did not work.

Now I found that I cannot login when `emacs -q' and I can only login
without problems when I am using `emacs -Q'

I have then removed the non existent site-start.el it was dangling
symbolic link, and then it started working with `emacs -q'

I will try bisecting, but I am not sure. Each time I need to kill the
ssh tramp process in background as well to debug what is wrong.

Jean

bug#41496: 28.0.50; When accessing sshd via Tramp via Termux on Android: File error: Couldn't find a proper `ls' command

[Michael Albinus]

Jean Louis <bugs@gnu.support> writes:

> Hello Michael,

Hi Jean,

> Now I found that I cannot login when `emacs -q' and I can only login
> without problems when I am using `emacs -Q'
>
> I have then removed the non existent site-start.el it was dangling
> symbolic link, and then it started working with `emacs -q'
>
> I will try bisecting, but I am not sure. Each time I need to kill the
> ssh tramp process in background as well to debug what is wrong.

Maybe the Tramp cache is in the way. Try "M-x tramp-cleanup-all-connections".

> Jean

Best regards, Michael.

bug#41496: 28.0.50; When accessing sshd via Tramp via Termux on Android: File error: Couldn't find a proper `ls' command

[Jean Louis]

* Michael Albinus <michael.albinus@gmx.de> [2020-05-24 20:15]:
> Jean Louis <bugs@gnu.support> writes:
> 
> > Hello Michael,
> 
> Hi Jean,
> 
> > Now I found that I cannot login when `emacs -q' and I can only login
> > without problems when I am using `emacs -Q'
> >
> > I have then removed the non existent site-start.el it was dangling
> > symbolic link, and then it started working with `emacs -q'
> >
> > I will try bisecting, but I am not sure. Each time I need to kill the
> > ssh tramp process in background as well to debug what is wrong.
> 
> Maybe the Tramp cache is in the way. Try "M-x tramp-cleanup-all-connections".

Thank you, that made it working.

But I do wonder, because I have restarted Emacs, and killed sshd
connections in background.

At least now I got it working with my full setup.

Thanks.

Jean

bug#41496: 28.0.50; When accessing sshd via Tramp via Termux on Android: File error: Couldn't find a proper `ls' command

[Michael Albinus]

Jean Louis <bugs@gnu.support> writes:

Hi Jean,

>> Maybe the Tramp cache is in the way. Try "M-x tramp-cleanup-all-connections".
>
> Thank you, that made it working.

Good, so I'm closing the bug.

> But I do wonder, because I have restarted Emacs, and killed sshd
> connections in background.

The Tramp cache is kept persistently in a file. Only "emacs -Q" doesn't
load it.

> At least now I got it working with my full setup.
>
> Thanks.
>
> Jean

Best regards, Michael.