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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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23
src/libexpr/primops.cc
View file

@ -778,7 +778,6 @@ static void prim_findFile(EvalState & state, const Pos & pos, Value * * args, Va
SearchPath searchPath;
PathSet context;
for (unsigned int n = 0; n < args[0]->listSize(); ++n) {
Value & v2(*args[0]->listElems()[n]);
state.forceAttrs(v2, pos);
@ -791,21 +790,23 @@ static void prim_findFile(EvalState & state, const Pos & pos, Value * * args, Va
i = v2.attrs->find(state.symbols.create("path"));
if (i == v2.attrs->end())
throw EvalError(format("attribute ‘path’ missing, at %1%") % pos);
string path = state.coerceToPath(pos, *i->value, context);
searchPath.push_back(std::pair<string, Path>(prefix, state.checkSourcePath(path)));
PathSet context;
string path = state.coerceToString(pos, *i->value, context, false, false);
try {
state.realiseContext(context);
} catch (InvalidPathError & e) {
throw EvalError(format("cannot find ‘%1%’, since path ‘%2%’ is not valid, at %3%")
% path % e.path % pos);
}
searchPath.emplace_back(prefix, path);
}
string path = state.forceStringNoCtx(*args[1], pos);
try {
state.realiseContext(context);
} catch (InvalidPathError & e) {
throw EvalError(format("cannot find ‘%1%’, since path ‘%2%’ is not valid, at %3%")
% path % e.path % pos);
}
mkPath(v, state.findFile(searchPath, path, pos).c_str());
mkPath(v, state.checkSourcePath(state.findFile(searchPath, path, pos)).c_str());
}
/* Read a directory (without . or ..) */