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Update README.md with nix.conf changes needed for persistent derivations

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It appears that the derivations produced by nix-direnv are removed when running nix's garbage collection. Troubleshooting this issue led me to a git issue in the NixOS/nix repo [1]. Enabling both `keep-derivations` and `keep-outputs` worked for me as recommended, and now nix-direnv is working.

[1]: https://github.com/NixOS/nix/issues/2208
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Matt Snider 2020-03-05 23:37:55 +01:00 • committed by GitHub
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@ -20,3 +20,10 @@ Then source the direnvrc from this repository in your own `.direnvrc`
# put this in ~/.direnvrc # put this in ~/.direnvrc
source $HOME/.nix-direnv/direnvrc source $HOME/.nix-direnv/direnvrc
``` ```
For derivations to persist garbage collection, set the following in nix.conf:
```
keep-derivations = true
keep-outputs = true
```