forked from lix-project/lix
139 lines
4.2 KiB
C++
139 lines
4.2 KiB
C++
#include "misc.hh"
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#include "store-api.hh"
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#include "local-store.hh"
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#include "globals.hh"
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namespace nix {
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Derivation derivationFromPath(StoreAPI & store, const Path & drvPath)
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{
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assertStorePath(drvPath);
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store.ensurePath(drvPath);
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return parseDerivation(readFile(drvPath));
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}
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void computeFSClosure(StoreAPI & store, const Path & storePath,
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PathSet & paths, bool flipDirection, bool includeOutputs)
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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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if (includeOutputs && isDerivation(storePath)) {
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PathSet outputs = store.queryDerivationOutputs(storePath);
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foreach (PathSet::iterator, i, outputs)
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if (store.isValidPath(*i))
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computeFSClosure(store, *i, paths, flipDirection, true);
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}
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foreach (PathSet::iterator, i, references)
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computeFSClosure(store, *i, paths, flipDirection, includeOutputs);
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}
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Path findOutput(const Derivation & drv, string id)
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{
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foreach (DerivationOutputs::const_iterator, i, drv.outputs)
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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(StoreAPI & store, const PathSet & targets,
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PathSet & willBuild, PathSet & willSubstitute, PathSet & unknown,
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unsigned long long & downloadSize, unsigned long long & narSize)
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{
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downloadSize = narSize = 0;
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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)) {
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unknown.insert(p);
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continue;
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}
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Derivation drv = derivationFromPath(store, p);
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bool mustBuild = false;
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foreach (DerivationOutputs::iterator, i, drv.outputs)
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if (!store.isValidPath(i->second.path) &&
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!(queryBoolSetting("build-use-substitutes", true) && store.hasSubstitutes(i->second.path)))
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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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foreach (DerivationInputs::iterator, i, drv.inputDrvs)
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todo.insert(i->first);
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} else
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foreach (DerivationOutputs::iterator, i, drv.outputs)
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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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SubstitutablePathInfo info;
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if (store.querySubstitutablePathInfo(p, info)) {
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willSubstitute.insert(p);
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downloadSize += info.downloadSize;
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narSize += info.narSize;
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todo.insert(info.references.begin(), info.references.end());
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} else
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unknown.insert(p);
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}
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}
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}
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static void dfsVisit(StoreAPI & store, const PathSet & paths,
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const Path & path, PathSet & visited, Paths & sorted,
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PathSet & parents)
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{
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if (parents.find(path) != parents.end())
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throw BuildError(format("cycle detected in the references of `%1%'") % path);
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if (visited.find(path) != visited.end()) return;
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visited.insert(path);
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parents.insert(path);
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PathSet references;
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if (store.isValidPath(path))
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store.queryReferences(path, references);
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foreach (PathSet::iterator, i, references)
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/* Don't traverse into paths that don't exist. That can
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happen due to substitutes for non-existent paths. */
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if (*i != path && paths.find(*i) != paths.end())
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dfsVisit(store, paths, *i, visited, sorted, parents);
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sorted.push_front(path);
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parents.erase(path);
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}
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Paths topoSortPaths(StoreAPI & store, const PathSet & paths)
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{
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Paths sorted;
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PathSet visited, parents;
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foreach (PathSet::const_iterator, i, paths)
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dfsVisit(store, paths, *i, visited, sorted, parents);
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return sorted;
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}
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}
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