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authorEelco Dolstra <eelco.dolstra@logicblox.com>2016-04-14T13·32+0200
committerEelco Dolstra <eelco.dolstra@logicblox.com>2016-04-14T13·32+0200
commit363f37d0843d87e03bd4dcb600ce04e7be60d7e1 (patch)
tree006704025fa074f412c530938dd804080fc3ba3b /.dir-locals.el
parentfc6a03298989383aa6d4562b51820d45a0f728eb (diff)
Make the search path lazier with non-fatal errors
Thus, -I / $NIX_PATH entries are now downloaded only when they are
needed for evaluation. An error to download an entry is a non-fatal
warning (just like non-existant paths).

This does change the semantics of builtins.nixPath, which now returns
the original, rather than resulting path. E.g., before we had

  [ { path = "/nix/store/hgm3yxf1lrrwa3z14zpqaj5p9vs0qklk-nixexprs.tar.xz"; prefix = "nixpkgs"; } ... ]

but now

  [ { path = "https://nixos.org/channels/nixos-16.03/nixexprs.tar.xz"; prefix = "nixpkgs"; } ... ]

Fixes #792.
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