Re: remote execution in heterogeneous environment

[Michael Albinus <michael.albinus@gmx.de>]

Neil Best <nbest@ci.uchicago.edu> writes:

> I had just recently upgraded Emacs through Macports but had not since
> restarted it, that's all.  No such luck on the Tramp upgrade.  I will
> just wait for the next release to propagate through Macports unless
> some intolerable behavior crops up.  I do have a shiny new version of
> Org to play with thanks to ELPA.  :)

There are still several problems, even with Tramp 2.2.6. I use Org
20121126 from ELPA.

1. test
=======

My local and remote hosts use "/tmp", both run Linux. So I have applied
prior to the test

--8<---------------cut here---------------start------------->8---
(setq temporary-file-directory "~/tmp/")
--8<---------------cut here---------------end--------------->8---

This directory is known to exist locally, but not remotely. When I eval
the source code block, I don't run into this infloop as you have seen
(this is fixed with Tramp 2.2.6, indeed). But there is another error

--8<---------------cut here---------------start------------->8---
Tramp: Decoding region into remote file /scpc:ford:/home/albinus/tmp/sh-205735cU...done
cond: Couldn't write region to `/scpc:ford:/home/albinus/tmp/sh-205735cU', decode using `base64 -d -i >%s' failed
--8<---------------cut here---------------end--------------->8---

Somewhere in the code, the remote temporary directory is created based
on `temporary-file-directory', which is wrong. I believe this is in
Org's code, must be debugged further.

2. test
=======

I keep `temporary-file-directory' as "/tmp". The source code block
evaluates fine, but the result is:

--8<---------------cut here---------------start------------->8---
#+BEGIN_SRC sh :dir /ford:~
echo "Executed by `whoami` on `hostname` in `pwd`"
#+END_SRC

#+RESULTS:
: Executed by albinus on detlef in /home/albinus
--8<---------------cut here---------------end--------------->8---

Obviously, the code is executed on the local host. As far as I could
debug it, this is because `org-babel-shell-command-on-region' calls
`call-process-region', which is not aware of remote execution.

>> PS: it's on my wishlist for a long time to learn org-mode. Maybe I have
>> a chance now.
>
> You won't regret it.  Have fun.  What's your use case?

Accessing lists on different devices, under Linux, Android etc.

> How did you happen to get on this thread?  Was there a cross-post that
> I missed?

Nothing special. I have looked into the ML archive for some other
reason, and I have seen this thread by accident.

> Thanks for pitching in, everyone.

Best regards, Michael.