bug#31691: 25.3; Emacs fails browsing remote files over FTP

bug#31691: 25.3; Emacs fails browsing remote files over FTP

[Maxim Cournoyer]

* Reproduction steps:

1. Install FTP server (in my case I installed and started 'primitive
ftpd' with F-Droid on my Android phone).

2. Run: emacs -Q --eval '(find-file "/ftp:anonymous@192.168.1.101#12345:/")'
adapting for your local private IP address.

This should leave you blank buffer. Visiting the buffer starting by *ftp
anonymous ...*, we can find:

--8<---------------cut here---------------start------------->8---
ftp> open 192.168.1.101 12345
Connected to 192.168.1.101.
220 Service ready for new user.
user "anonymous" Turtle Power!
ftp> 331 Guest login okay, send your complete e-mail address as password.
230 User logged in, proceed.
ftp> hash
Hash mark printing on (1024 bytes/hash mark).
ftp> pwd
257 "/" is current directory.
ftp> cd /
250 Directory changed to /
ftp> ls -al /tmp/ange-ftp22301BWx
200 Command PORT okay.
cd /
150 File status okay; about to open data connection.

226 Closing data connection.
ftp> ls -al /tmp/ange-ftp22301fzv
250 Directory changed to /
ftp> 200 Command PORT okay.
150 File status okay; about to open data connection.
######
226 Closing data connection.
ftp>
--8<---------------cut here---------------end--------------->8---

* Trying same commands using inetutils' ftp client:

$ ftp 192.168.1.101 12345
Connected to 192.168.1.101.
220 Service ready for new user.
Name (192.168.1.101:maxim): anonymous
331 Guest login okay, send your complete e-mail address as password.
Password: 
230 User logged in, proceed.
Remote system type is UNIX.
ftp> hash
Hash mark printing on (1024 bytes/hash mark).
ftp> pwd
257 "/" is current directory.
ftp> cd /
250 Directory changed to /
ftp> ls -al /tmp/ange-ftp22301BWx
output to local-file: /tmp/ange-ftp22301BWx? 
200 Command PORT okay.
150 File status okay; about to open data connection.
######
226 Closing data connection.
ftp>

Notice that I was prompted for some input after entering the "ls -al
/tmp/ange-ftp22301BWx" command. That might be what is causing the issue?

* Automatically generated

In GNU Emacs 25.3.1 (x86_64-pc-linux-gnu, GTK+ Version 3.22.21)
 of 2018-02-06 built on localhost
Windowing system distributor 'The X.Org Foundation', version 11.0.11906000
Configured using:
 'configure
 CONFIG_SHELL=/gnu/store/f8k940vy9gck66m9r4id5m098w3hxgka-bash-minimal-4.4.12/bin/bash
 SHELL=/gnu/store/f8k940vy9gck66m9r4id5m098w3hxgka-bash-minimal-4.4.12/bin/bash
 --prefix=/gnu/store/y335nx4r08m6kg0yrna7spfwr4s05n36-emacs-25.3
 --enable-fast-install'

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND DBUS GSETTINGS NOTIFY ACL
GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB TOOLKIT_SCROLL_BARS
GTK3 X11

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Debbugs

Minor modes in effect:
  magit-auto-revert-mode: t
  global-git-commit-mode: t
  async-bytecomp-package-mode: t
  shell-dirtrack-mode: t
  diff-auto-refine-mode: t
  winner-mode: t
  show-paren-mode: t
  display-time-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  size-indication-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent messages:
mwheel-scroll: Beginning of buffer [2 times]
Mark set [3 times]
mwheel-scroll: Beginning of buffer [2 times]
Type C-x 4 C-o RET to restore the other window.  
Quit
Mark saved where search started
Type "q" in help window to restore its previous buffer.
mouse-2, RET: find function's definition
uncompressing emacsbug.el.gz...done
Note: file is write protected

Load-path shadows:
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bug#31691: 25.3; Emacs fails browsing remote files over FTP

[Michael Albinus]

Maxim Cournoyer <maxim.cournoyer@gmail.com> writes:

Hi Maxim,

> * Reproduction steps:
>
> 1. Install FTP server (in my case I installed and started 'primitive
> ftpd' with F-Droid on my Android phone).
>
> 2. Run: emacs -Q --eval '(find-file "/ftp:anonymous@192.168.1.101#12345:/")'
> adapting for your local private IP address.
>
> This should leave you blank buffer. Visiting the buffer starting by *ftp
> anonymous ...*, we can find:

What do you mean with "This should leave you blank buffer."? Do you want
to say, that just a blank buffer is shown, instead of the dired listing?

And do you see the same problem when connecting to any other ftp server,
say "/ftp:anonymous@ftp.gnu.org:/"?

Bst regards, Michael.

bug#31691: 25.3; Emacs fails browsing remote files over FTP

[Maxim Cournoyer]

Hi Michael,

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

> Maxim Cournoyer <maxim.cournoyer@gmail.com> writes:
>
> Hi Maxim,
>
>> * Reproduction steps:
>>
>> 1. Install FTP server (in my case I installed and started 'primitive
>> ftpd' with F-Droid on my Android phone).
>>
>> 2. Run: emacs -Q --eval '(find-file "/ftp:anonymous@192.168.1.101#12345:/")'
>> adapting for your local private IP address.
>>
>> This should leave you blank buffer. Visiting the buffer starting by *ftp
>> anonymous ...*, we can find:
>
> What do you mean with "This should leave you blank buffer."? Do you want
> to say, that just a blank buffer is shown, instead of the dired listing?

You guessed right, this is what is happening :)

> And do you see the same problem when connecting to any other ftp server,
> say "/ftp:anonymous@ftp.gnu.org:/"?

I adapted my repro command like this:

--8<---------------cut here---------------start------------->8---
emacs -Q --eval '(find-file "/ftp:anonymous@ftp.gnu.org:/")'
--8<---------------cut here---------------end--------------->8---

And obtained the listing... So maybe the bug is only exhibited with this
particular FTP server ('primitive ftp' from F-Droid on Android).

I just tried a second FTP server (the one included with Amaze, a file
manager available for Android on F-Droid), and found it exhibits the
same problem as with 'primite FTP' (I get a blank buffer instead of the
dired listing).

Maybe the problem only happen when attempting to use an FTP server on
Android?

Thank you!

Maxim

bug#31691: 25.3; Emacs fails browsing remote files over FTP

[Michael Albinus]

Maxim Cournoyer <maxim.cournoyer@gmail.com> writes:

> Hi Michael,

Hi Maxim,

> Maybe the problem only happen when attempting to use an FTP server on
> Android?

Perhaps. I cannot test myself, because I don't run an ftp server on my
Android device (and I don't intend to do).

Are you bound to the ftp method? There are other possibilities to
connect to Android via Tramp. First, you could try the "adb" method, it
uses the Android Debug Bridge. Disadvantage is, that you need an USB
connection. Read the Tramp manual for details.

Somebody has also used an sshd daemon on an Android device, accessing it
via Tramp with "ssh" or friends, The setup is described in the Tramp
manual, chapter "4.17 Android shell setup hints".

> Thank you!
>
> Maxim

Best regards, Michael.

bug#31691: 25.3; Emacs fails browsing remote files over FTP

[Maxim Cournoyer]

Hello Michael,

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

> Maxim Cournoyer <maxim.cournoyer@gmail.com> writes:
>
>> Hi Michael,
>
> Hi Maxim,
>
>> Maybe the problem only happen when attempting to use an FTP server on
>> Android?
>
> Perhaps. I cannot test myself, because I don't run an ftp server on my
> Android device (and I don't intend to do).
>
> Are you bound to the ftp method? There are other possibilities to
> connect to Android via Tramp. First, you could try the "adb" method, it
> uses the Android Debug Bridge. Disadvantage is, that you need an USB
> connection. Read the Tramp manual for details.

Thanks for pointing me to this way. I have a functional adb working, so
minus the hassle of a cable, this is a neat alternative that I'll try
shortly.

> Somebody has also used an sshd daemon on an Android device, accessing it
> via Tramp with "ssh" or friends, The setup is described in the Tramp
> manual, chapter "4.17 Android shell setup hints".

While SSH would be much better than FTP, I couldn't find a way to
install an SSH server on my non-rooted phone :/.

Thanks for the ideas,

Maxim

bug#31691: 25.3; Emacs fails browsing remote files over FTP

[Michael Albinus]

Maxim Cournoyer <maxim.cournoyer@gmail.com> writes:

> Hello Michael,

Hi Maxim,

>> Are you bound to the ftp method? There are other possibilities to
>> connect to Android via Tramp. First, you could try the "adb" method, it
>> uses the Android Debug Bridge. Disadvantage is, that you need an USB
>> connection. Read the Tramp manual for details.
>
> Thanks for pointing me to this way. I have a functional adb working, so
> minus the hassle of a cable, this is a neat alternative that I'll try
> shortly.

IIRC, there are problems of the Tramp version built in Emacs 25 with
newer Android releases. So I recommend you to switch to Emacs 26.1, or
to install at least a newer Tramp release.

>> Somebody has also used an sshd daemon on an Android device, accessing it
>> via Tramp with "ssh" or friends, The setup is described in the Tramp
>> manual, chapter "4.17 Android shell setup hints".
>
> While SSH would be much better than FTP, I couldn't find a way to
> install an SSH server on my non-rooted phone :/.

The Tramp manual speaks about the SSHDroid app. But I have no idea what
it takes to install it.

> Thanks for the ideas,
>
> Maxim

Best regards, Michael.

bug#31691: 25.3; Emacs fails browsing remote files over FTP

[Robert Pluim]

Maxim Cournoyer <maxim.cournoyer@gmail.com> writes:

> Hello Michael,
>
> Michael Albinus <michael.albinus@gmx.de> writes:
>
>> Maxim Cournoyer <maxim.cournoyer@gmail.com> writes:
>>
>>> Hi Michael,
>>
>> Hi Maxim,
>>
>>> Maybe the problem only happen when attempting to use an FTP server on
>>> Android?
>>
>> Perhaps. I cannot test myself, because I don't run an ftp server on my
>> Android device (and I don't intend to do).
>>
>> Are you bound to the ftp method? There are other possibilities to
>> connect to Android via Tramp. First, you could try the "adb" method, it
>> uses the Android Debug Bridge. Disadvantage is, that you need an USB
>> connection. Read the Tramp manual for details.
>
> Thanks for pointing me to this way. I have a functional adb working, so
> minus the hassle of a cable, this is a neat alternative that I'll try
> shortly.

You can connect to the adb service over tcp once you've started it on
your target device, so you only need the cable at the beginning.

>> Somebody has also used an sshd daemon on an Android device, accessing it
>> via Tramp with "ssh" or friends, The setup is described in the Tramp
>> manual, chapter "4.17 Android shell setup hints".
>
> While SSH would be much better than FTP, I couldn't find a way to
> install an SSH server on my non-rooted phone :/.

What's a non-rooted phone? ;-)

Robert

bug#31691: 25.3; Emacs fails browsing remote files over FTP

[Michael Albinus]

Robert Pluim <rpluim@gmail.com> writes:

Hi Robert,

>> While SSH would be much better than FTP, I couldn't find a way to
>> install an SSH server on my non-rooted phone :/.
>
> What's a non-rooted phone? ;-)

Mine, for example :-)

As said, I'm restricted in teaching Tramp over adb.

> Robert

Best regards, Michael.

bug#31691: 25.3; Emacs fails browsing remote files over FTP

[Maxim Cournoyer]

Hi Robert,

Robert Pluim <rpluim@gmail.com> writes:

[...]

>>> Are you bound to the ftp method? There are other possibilities to
>>> connect to Android via Tramp. First, you could try the "adb" method, it
>>> uses the Android Debug Bridge. Disadvantage is, that you need an USB
>>> connection. Read the Tramp manual for details.
>>
>> Thanks for pointing me to this way. I have a functional adb working, so
>> minus the hassle of a cable, this is a neat alternative that I'll try
>> shortly.
>
> You can connect to the adb service over tcp once you've started it on
> your target device, so you only need the cable at the beginning.

Interesting! Thanks for the info.

>>> Somebody has also used an sshd daemon on an Android device, accessing it
>>> via Tramp with "ssh" or friends, The setup is described in the Tramp
>>> manual, chapter "4.17 Android shell setup hints".
>>
>> While SSH would be much better than FTP, I couldn't find a way to
>> install an SSH server on my non-rooted phone :/.
>
> What's a non-rooted phone? ;-)

A phone on which you cannot alter the protected parts of the filesystem;
it's akin to not having 'sudo' on a GNU/Linux distro. All Android phones
come this way; some can easily be rooted if the bootloader can be unlocked,
but not all Android phones have this decency.

Maxim

bug#31691: 25.3; Emacs fails browsing remote files over FTP

[Maxim Cournoyer]

Hi Michael,

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

> Maxim Cournoyer <maxim.cournoyer@gmail.com> writes:
>
>> Hello Michael,
>
> Hi Maxim,
>
>>> Are you bound to the ftp method? There are other possibilities to
>>> connect to Android via Tramp. First, you could try the "adb" method, it
>>> uses the Android Debug Bridge. Disadvantage is, that you need an USB
>>> connection. Read the Tramp manual for details.
>>
>> Thanks for pointing me to this way. I have a functional adb working, so
>> minus the hassle of a cable, this is a neat alternative that I'll try
>> shortly.
>
> IIRC, there are problems of the Tramp version built in Emacs 25 with
> newer Android releases. So I recommend you to switch to Emacs 26.1, or
> to install at least a newer Tramp release.

Good to know! I've just updated my GuixSD system and Emacs is now at
26.1, so I should be good!

>>> Somebody has also used an sshd daemon on an Android device, accessing it
>>> via Tramp with "ssh" or friends, The setup is described in the Tramp
>>> manual, chapter "4.17 Android shell setup hints".
>>
>> While SSH would be much better than FTP, I couldn't find a way to
>> install an SSH server on my non-rooted phone :/.
>
> The Tramp manual speaks about the SSHDroid app. But I have no idea what
> it takes to install it.

It seems to only be available through Google Play (I don't have it -- I
use F-Droid) and also it doesn't seem to be free software (couldn't find
the source code anywhere).

Maxim

bug#31691: 25.3; Emacs fails browsing remote files over FTP

[Michael Albinus]

Maxim Cournoyer <maxim.cournoyer@gmail.com> writes:

> Hi Michael,

Hi Maxim,

>>>> Somebody has also used an sshd daemon on an Android device, accessing it
>>>> via Tramp with "ssh" or friends, The setup is described in the Tramp
>>>> manual, chapter "4.17 Android shell setup hints".
>>>
>>> While SSH would be much better than FTP, I couldn't find a way to
>>> install an SSH server on my non-rooted phone :/.
>>
>> The Tramp manual speaks about the SSHDroid app. But I have no idea what
>> it takes to install it.
>
> It seems to only be available through Google Play (I don't have it -- I
> use F-Droid) and also it doesn't seem to be free software (couldn't find
> the source code anywhere).

Maybe termux is an option for you? It is available on F-Droid, and it is
GPLv3 licensed.

<https://termux.com/>

> Maxim

Best regards, Michael.

bug#31691: 25.3; Emacs fails browsing remote files over FTP

[Michael Albinus]

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

Hi Maxim,

>>>>> Somebody has also used an sshd daemon on an Android device, accessing it
>>>>> via Tramp with "ssh" or friends, The setup is described in the Tramp
>>>>> manual, chapter "4.17 Android shell setup hints".
>>>>
>>>> While SSH would be much better than FTP, I couldn't find a way to
>>>> install an SSH server on my non-rooted phone :/.
>>>
>>> The Tramp manual speaks about the SSHDroid app. But I have no idea what
>>> it takes to install it.
>>
>> It seems to only be available through Google Play (I don't have it -- I
>> use F-Droid) and also it doesn't seem to be free software (couldn't find
>> the source code anywhere).
>
> Maybe termux is an option for you? It is available on F-Droid, and it is
> GPLv3 licensed.
>
> <https://termux.com/>

No further response, so I close this bug as wontfix. However, feel free
to reply if you have further questions.

>> Maxim

Best regards, Michael.

bug#31691: 25.3; Emacs fails browsing remote files over FTP

[Maxim Cournoyer]

Hello,

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

[...]

>> Maybe termux is an option for you? It is available on F-Droid, and it is
>> GPLv3 licensed.
>>
>> <https://termux.com/>
>
> No further response, so I close this bug as wontfix. However, feel free
> to reply if you have further questions.

Thank you Michael for your help; I haven't had a chance to try if I
could setup an SSH server in termux, but I've been using successfully
the adb support provided by TRAMP which you suggested earlier.

Thanks again,

Maxim Cournoyer