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* Started removing closure store expressions, i.e., the explicit

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representation of closures as ATerms in the Nix store.  Instead, the
  file system pointer graph is now stored in the Nix database.  This
  has many advantages:

  - It greatly simplifies the implementation (we can drop the notion
    of `successors', and so on).

  - It makes registering roots for the garbage collector much easier.
    Instead of specifying the closure expression as a root, you can
    simply specify the store path that must be retained as a root.
    This could not be done previously, since there was no way to find
    the closure store expression containing a given store path.
    
  - Better traceability: it is now possible to query what paths are
    referenced by a path, and what paths refer to a path.
This commit is contained in:
Eelco Dolstra 2005-01-19 11:16:11 +00:00
parent e9762e2d10
commit 863dcff6c5
15 changed files with 407 additions and 890 deletions
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6
src/nix-env/main.cc
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@ -222,13 +222,13 @@ void createUserEnv(EvalState & state, const DrvInfos & drvs,
abort();
/* Realise the resulting store expression. */
debug(format("realising user environment"));
Path nfPath = realiseStoreExpr(topLevelDrv.drvPath);
debug(format("building user environment"));
buildDerivation(topLevelDrv.drvPath);
/* Switch the current user environment to the output path. */
debug(format("switching to new user environment"));
Path generation = createGeneration(profile,
topLevelDrv.outPath, topLevelDrv.drvPath, nfPath);
topLevelDrv.outPath, topLevelDrv.drvPath);
switchLink(profile, generation);
}