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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.
This commit is contained in:
Eelco Dolstra 2016-04-14 15:32:24 +02:00
parent fc6a032989
commit 363f37d084
5 changed files with 75 additions and 34 deletions
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6
tests/tarball.sh
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@ -21,3 +21,9 @@ nix-build -o $TMPDIR/result file://$tarball
nix-build -o $TMPDIR/result '<foo>' -I foo=file://$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=.