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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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10
src/libexpr/eval.hh
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@ -56,7 +56,8 @@ typedef std::map<Path, Path> SrcToStore;
std::ostream & operator << (std::ostream & str, const Value & v);
typedef list<std::pair<string, Path> > SearchPath;
typedef std::pair<std::string, std::string> SearchPathElem;
typedef std::list<SearchPathElem> SearchPath;
/* Initialise the Boehm GC, if applicable. */
@ -98,12 +99,14 @@ private:
SearchPath searchPath;
std::map<std::string, std::pair<bool, std::string>> searchPathResolved;
public:
EvalState(const Strings & _searchPath, ref<Store> store);
~EvalState();
void addToSearchPath(const string & s, bool warn = false);
void addToSearchPath(const string & s);
Path checkSourcePath(const Path & path);
@ -125,6 +128,9 @@ public:
Path findFile(const string & path);
Path findFile(SearchPath & searchPath, const string & path, const Pos & pos = noPos);
/* If the specified search path element is a URI, download it. */
std::pair<bool, std::string> resolveSearchPathElem(const SearchPathElem & elem);
/* Evaluate an expression to normal form, storing the result in
value `v'. */
void eval(Expr * e, Value & v);