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Make the search path lazier with non-fatal errors

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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.

(cherry picked from commit 363f37d084)
This commit is contained in:
Eelco Dolstra 2016-04-14 15:32:24 +02:00
parent dea9de79b7
commit efa2e451fb
5 changed files with 76 additions and 35 deletions
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8
tests/tarball.sh
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@ -20,4 +20,10 @@ nix-build file://$tarball
nix-build '<foo>' -I foo=file://$tarball
nix-build -E "import (fetchTarball file://$tarball)"
nix-build -o $TMPDIR/result -E "import (fetchTarball file://$tarball)"
nix-instantiate --eval -E '1 + 2' -I fnord=file://no-such-tarball.tar.xz
nix-instantiate --eval -E 'with <fnord/xyzzy>; 1 + 2' -I fnord=file://no-such-tarball.tar.xz
(! nix-instantiate --eval -E '<fnord/xyzzy> 1' -I fnord=file://no-such-tarball.tar.xz)
nix-instantiate --eval -E '<fnord/config.nix>' -I fnord=file://no-such-tarball.tar.xz -I fnord=.