Re: Org babel source blocks ignore buffer-local variables

[Berry, Charles]

> On Sep 4, 2021, at 5:30 AM, Dominik Schrempf <dominik.schrempf@gmail.com> 
> wrote:
> 
> Hello,
> 
> I use directory local environments with =envrc= [1], and run into trouble when
> using (Bash) Org Babel source code blocks. The buffer local environment seems 
> to
> be ignored (see the example at the bottom).
> 
> This seems to have been discussed in the course of a GitHub issue of
> =inheritenv= [2], which is pulled in by =envrc=. Also, on this mailing list,
> there was a short discussion [3].
> 
> Do you have any thoughts on this? Is there an easy way to make Org Babel 
> source
> blocks honor buffer local setups?
> 
> Thank you!
> Dominik
> 
> #+name: Scratch
> #+begin_src sh :exports both :results output verbatim
> function path () { echo "$PATH" | tr ':' '\n'; }
> path
> #+end_src
> 
> #+RESULTS: Scratch
> #+begin_example
> /home/dominik/Evolutionary-Biology/Scripts/nix-flakes
> /home/dominik/Evolutionary-Biology/Scripts
> /home/dominik/bin/nix-flakes
> /home/dominik/bin
> /run/wrappers/bin
> /home/dominik/.nix-profile/bin
> /etc/profiles/per-user/dominik/bin
> /nix/var/nix/profiles/default/bin
> /run/current-system/sw/bin
> /nix/store/3l9lddwxz1mayaxvw8iy50ygzzfh1s1b-emacs-27.2/libexec/emacs/27.2/x86_64-pc-linux-gnu
> #+end_example
> 
> The Emacs =exec-path= variable has the following value:
> 
> #+begin_quote
> exec-path is a variable defined in ‘C source code’.
> Its value is
> ("/nix/store/cnxncxyghj3gfpfvng6z4l8k4hfl48wq-ghc-8.10.6-with-packages/bin/" 
> "/nix/store/435paza0j48aa9vgvf6r2l12nrg4ld11-patchelf-0.12/bin/" 

[snip]

Indeed, ~exec-path~ and ~(getenv "PATH")~ can differ.

If you want to set PATH for a shell src block, you can do something like:

#+begin_src sh :results output verbatim :var PATH=(mapconcat 'identity 
exec-path ":")
  echo $PATH
#+end_src

HTH,

Chuck