mirror of
https://github.com/NixOS/nix
synced 2024-09-20 23:28:26 -04:00
e2ef5e07fd
containing functions that operate on the Nix store. One implementation is LocalStore, which operates on the Nix store directly. The next step, to enable secure multi-user Nix, is to create a different implementation RemoteStore that talks to a privileged daemon process that uses LocalStore to perform the actual operations.
95 lines
2.6 KiB
C++
95 lines
2.6 KiB
C++
#include "misc.hh"
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#include "store-api.hh"
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#include "build.hh"
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#include "db.hh"
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#include <aterm2.h>
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namespace nix {
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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, bool flipDirection)
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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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if (flipDirection)
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store->queryReferrers(storePath, references);
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else
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store->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, flipDirection);
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}
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Path findOutput(const Derivation & drv, string id)
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{
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for (DerivationOutputs::const_iterator i = drv.outputs.begin();
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i != drv.outputs.end(); ++i)
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if (i->first == id) return i->second.path;
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throw Error(format("derivation has no output `%1%'") % id);
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}
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void queryMissing(const PathSet & targets,
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PathSet & willBuild, PathSet & willSubstitute)
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{
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PathSet todo(targets.begin(), targets.end()), done;
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while (!todo.empty()) {
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Path p = *(todo.begin());
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todo.erase(p);
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if (done.find(p) != done.end()) continue;
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done.insert(p);
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if (isDerivation(p)) {
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if (!store->isValidPath(p)) continue;
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Derivation drv = derivationFromPath(p);
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bool mustBuild = false;
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for (DerivationOutputs::iterator i = drv.outputs.begin();
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i != drv.outputs.end(); ++i)
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if (!store->isValidPath(i->second.path) &&
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store->querySubstitutes(i->second.path).size() == 0)
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mustBuild = true;
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if (mustBuild) {
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willBuild.insert(p);
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todo.insert(drv.inputSrcs.begin(), drv.inputSrcs.end());
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for (DerivationInputs::iterator i = drv.inputDrvs.begin();
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i != drv.inputDrvs.end(); ++i)
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todo.insert(i->first);
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} else
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for (DerivationOutputs::iterator i = drv.outputs.begin();
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i != drv.outputs.end(); ++i)
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todo.insert(i->second.path);
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}
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else {
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if (store->isValidPath(p)) continue;
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if (store->querySubstitutes(p).size() > 0)
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willSubstitute.insert(p);
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PathSet refs;
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store->queryReferences(p, todo);
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}
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}
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}
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}
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