org babel before excute hook

[Henning Redestig <henning.red@gmail.com>]

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I collaborate with different people on the same orgfile which contains many
source blocks that generate graphics by e.g. :results graphics abc.pdf

It can happen that I or someone else accidentally create another
independent source block that overwrites my abc.pdf which is of course very
bad.

I would like to add functionality so that org-babel-execute-src-block
checks if in :results graphics FILE, FILE is already referred to by another
source block and if so refuse to evaluate.

However, I only see a org-babel-after-execute-hook but no
org-babel-before-execute-hook

any reason for this? I could try to write a patch but thought I'd ask
first.

....or if there is an even better approach to avoid overwriting output from
different source blocks..

//Henning

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