863dcff6c5
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.
90 lines
2.3 KiB
C++
90 lines
2.3 KiB
C++
#include "normalise.hh"
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Derivation derivationFromPath(const Path & drvPath)
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{
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assertStorePath(drvPath);
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ensurePath(drvPath);
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ATerm t = ATreadFromNamedFile(drvPath.c_str());
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if (!t) throw Error(format("cannot read aterm from `%1%'") % drvPath);
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return parseDerivation(t);
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}
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void computeFSClosure(const Path & storePath,
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PathSet & paths)
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{
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if (paths.find(storePath) != paths.end()) return;
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paths.insert(storePath);
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PathSet references;
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queryReferences(storePath, references);
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for (PathSet::iterator i = references.begin();
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i != references.end(); ++i)
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computeFSClosure(*i, paths);
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}
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#if 0
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PathSet storeExprRoots(const Path & nePath)
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{
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PathSet paths;
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StoreExpr ne = storeExprFromPath(nePath);
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if (ne.type == StoreExpr::neClosure)
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paths.insert(ne.closure.roots.begin(), ne.closure.roots.end());
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else if (ne.type == StoreExpr::neDerivation)
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for (DerivationOutputs::iterator i = ne.derivation.outputs.begin();
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i != ne.derivation.outputs.end(); ++i)
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paths.insert(i->second.path);
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else abort();
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return paths;
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}
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static void requisitesWorker(const Path & nePath,
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bool includeExprs, bool includeSuccessors,
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PathSet & paths, PathSet & doneSet)
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{
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checkInterrupt();
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if (doneSet.find(nePath) != doneSet.end()) return;
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doneSet.insert(nePath);
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StoreExpr ne = storeExprFromPath(nePath);
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if (ne.type == StoreExpr::neClosure)
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for (ClosureElems::iterator i = ne.closure.elems.begin();
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i != ne.closure.elems.end(); ++i)
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paths.insert(i->first);
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else if (ne.type == StoreExpr::neDerivation)
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for (PathSet::iterator i = ne.derivation.inputs.begin();
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i != ne.derivation.inputs.end(); ++i)
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requisitesWorker(*i,
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includeExprs, includeSuccessors, paths, doneSet);
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else abort();
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if (includeExprs) paths.insert(nePath);
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Path nfPath;
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if (includeSuccessors && querySuccessor(nePath, nfPath))
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requisitesWorker(nfPath, includeExprs, includeSuccessors,
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paths, doneSet);
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}
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PathSet storeExprRequisites(const Path & nePath,
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bool includeExprs, bool includeSuccessors)
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{
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PathSet paths;
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PathSet doneSet;
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requisitesWorker(nePath, includeExprs, includeSuccessors,
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paths, doneSet);
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return paths;
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}
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#endif
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