* ob-shell and remote shells
@ 2017-11-28 8:45 Michael Welle
2017-11-29 6:17 ` numbchild
0 siblings, 1 reply; 3+ messages in thread
From: Michael Welle @ 2017-11-28 8:45 UTC (permalink / raw)
To: emacs-orgmode
Hello,
I want to execute shell blocks like follows:
#+BEGIN_SRC shell :session n42 :dir /127.0.0.1: :shebang "#!/bin/bash"
echo los
echo $SHELL
echo $BASH
echo ready
#+end_src
The trouble is that the shebang property doesn't work in this case. The
script is executed with the login shell of the user and fails because of
syntax errors (for instance, if bashisms are used in the script).
With my minimal and dangerous knowledge about Org's source code ;), I
think the following might work (from ob-shell.el):
(defun org-babel-sh-initiate-session (&optional session _params)
"Initiate a session named SESSION according to PARAMS."
(when (and session (not (string= session "none")))
(save-window-excursion
(or (org-babel-comint-buffer-livep session)
(progn
(let ((explicit-shell-file-name (xxx)))
(shell session))
;; Needed for Emacs 23 since the marker is initially
;; undefined and the filter functions try to use it without
;; checking.
(set-marker comint-last-output-start (point))
(get-buffer (current-buffer)))))))
Note the let form. Further tasks that have to be done is to add the
shebang key to _params, which I hope is available at all places where
o-b-s-i-s is evaluated. Further at (xxx) a regexp etc. is needed to
transform the shebang line to a shell path suitable for e-s-f-n.
Any opinions, please? Depending on the opinions I will implement the
approach this week and see if it works as expected.
Regards
hmw
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: ob-shell and remote shells
2017-11-28 8:45 ob-shell and remote shells Michael Welle
@ 2017-11-29 6:17 ` numbchild
2017-11-29 7:13 ` Michael Welle
0 siblings, 1 reply; 3+ messages in thread
From: numbchild @ 2017-11-29 6:17 UTC (permalink / raw)
To: Michael Welle; +Cc: Org-mode
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Off the topic, I'm curious what is the `:session` in `ob-shell` ?
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On Tue, Nov 28, 2017 at 4:45 PM, Michael Welle <mwe012008@gmx.net> wrote:
> Hello,
>
> I want to execute shell blocks like follows:
>
> #+BEGIN_SRC shell :session n42 :dir /127.0.0.1: :shebang "#!/bin/bash"
> echo los
> echo $SHELL
> echo $BASH
> echo ready
> #+end_src
>
> The trouble is that the shebang property doesn't work in this case. The
> script is executed with the login shell of the user and fails because of
> syntax errors (for instance, if bashisms are used in the script).
>
> With my minimal and dangerous knowledge about Org's source code ;), I
> think the following might work (from ob-shell.el):
>
> (defun org-babel-sh-initiate-session (&optional session _params)
> "Initiate a session named SESSION according to PARAMS."
> (when (and session (not (string= session "none")))
> (save-window-excursion
> (or (org-babel-comint-buffer-livep session)
> (progn
> (let ((explicit-shell-file-name (xxx)))
> (shell session))
> ;; Needed for Emacs 23 since the marker is initially
> ;; undefined and the filter functions try to use it without
> ;; checking.
> (set-marker comint-last-output-start (point))
> (get-buffer (current-buffer)))))))
>
>
> Note the let form. Further tasks that have to be done is to add the
> shebang key to _params, which I hope is available at all places where
> o-b-s-i-s is evaluated. Further at (xxx) a regexp etc. is needed to
> transform the shebang line to a shell path suitable for e-s-f-n.
>
> Any opinions, please? Depending on the opinions I will implement the
> approach this week and see if it works as expected.
>
> Regards
> hmw
>
>
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: ob-shell and remote shells
2017-11-29 6:17 ` numbchild
@ 2017-11-29 7:13 ` Michael Welle
0 siblings, 0 replies; 3+ messages in thread
From: Michael Welle @ 2017-11-29 7:13 UTC (permalink / raw)
To: emacs-orgmode
Hello,
"numbchild@gmail.com" <numbchild@gmail.com> writes:
> Off the topic, I'm curious what is the `:session` in `ob-shell` ?
it basically means that state is preserved for code blocks that run in
the same session (as long as the interpreter is running). Or in other
words, imagine two code blocks: the first sets a variable, the second
prints the variable. Without sessions the code blocks run in different
shell instances and the second block doesn't 'see' the variable set by
the first code block. But if both run in the same session, the second
code block 'sees' the state left by the first code block.
Regard
hmw
^ permalink raw reply [flat|nested] 3+ messages in thread
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2017-11-28 8:45 ob-shell and remote shells Michael Welle
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