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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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29
src/libstore/misc.cc
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@ -1,16 +1,32 @@
#include "normalise.hh"
StoreExpr storeExprFromPath(const Path & path)
Derivation derivationFromPath(const Path & drvPath)
{
assertStorePath(path);
ensurePath(path);
ATerm t = ATreadFromNamedFile(path.c_str());
if (!t) throw Error(format("cannot read aterm from `%1%'") % path);
return parseStoreExpr(t);
assertStorePath(drvPath);
ensurePath(drvPath);
ATerm t = ATreadFromNamedFile(drvPath.c_str());
if (!t) throw Error(format("cannot read aterm from `%1%'") % drvPath);
return parseDerivation(t);
}
void computeFSClosure(const Path & storePath,
PathSet & paths)
{
if (paths.find(storePath) != paths.end()) return;
paths.insert(storePath);
PathSet references;
queryReferences(storePath, references);
for (PathSet::iterator i = references.begin();
i != references.end(); ++i)
computeFSClosure(*i, paths);
}
#if 0
PathSet storeExprRoots(const Path & nePath)
{
PathSet paths;
@ -71,3 +87,4 @@ PathSet storeExprRequisites(const Path & nePath,
paths, doneSet);
return paths;
}
#endif