Allow .envrc to integrate into existing direnv environments#2968
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Signed-off-by: Gerard Hickey <hickey@kinetic-compute.com>
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The existing
.envrcsets up the Nix environment which is nice, but not all of us use Nix.This change will make setting up the Nix environment conditional upon finding
nix-shell. This way if thedirenvis being executed outside of the Nix environmentdirenvwill not fail.In addition, the
source_upstdlib call is used to process all parent.envrcfiles.