221 lines
7.0 KiB
C++
221 lines
7.0 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 & path,
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PathSet & paths, bool flipDirection, bool includeOutputs, bool includeDerivers)
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{
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if (paths.find(path) != paths.end()) return;
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paths.insert(path);
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PathSet edges;
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if (flipDirection) {
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store.queryReferrers(path, edges);
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if (includeOutputs) {
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PathSet derivers = store.queryValidDerivers(path);
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foreach (PathSet::iterator, i, derivers)
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edges.insert(*i);
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}
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if (includeDerivers && isDerivation(path)) {
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PathSet outputs = store.queryDerivationOutputs(path);
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foreach (PathSet::iterator, i, outputs)
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if (store.isValidPath(*i) && store.queryDeriver(*i) == path)
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edges.insert(*i);
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}
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} else {
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store.queryReferences(path, edges);
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if (includeOutputs && isDerivation(path)) {
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PathSet outputs = store.queryDerivationOutputs(path);
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foreach (PathSet::iterator, i, outputs)
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if (store.isValidPath(*i)) edges.insert(*i);
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}
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if (includeDerivers) {
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Path deriver = store.queryDeriver(path);
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if (store.isValidPath(deriver)) edges.insert(deriver);
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}
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}
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foreach (PathSet::iterator, i, edges)
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computeFSClosure(store, *i, paths, flipDirection, includeOutputs, includeDerivers);
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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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/* Getting substitute info has high latency when using the binary
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cache substituter. Thus it's essential to do substitute
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queries in parallel as much as possible. To accomplish this
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we do the following:
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- For all paths still to be processed (‘todo’), we add all
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paths for which we need info to the set ‘query’. For an
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unbuilt derivation this is the output paths; otherwise, it's
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the path itself.
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- We get info about all paths in ‘query’ in parallel.
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- We process the results and add new items to ‘todo’ if
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necessary. E.g. if a path is substitutable, then we need to
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get info on its references.
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- Repeat until ‘todo’ is empty.
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*/
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while (!todo.empty()) {
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PathSet query, todoDrv, todoNonDrv;
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foreach (PathSet::iterator, i, todo) {
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if (done.find(*i) != done.end()) continue;
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done.insert(*i);
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DrvPathWithOutputs i2 = parseDrvPathWithOutputs(*i);
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if (isDerivation(i2.first)) {
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if (!store.isValidPath(i2.first)) {
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// FIXME: we could try to substitute p.
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unknown.insert(*i);
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continue;
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}
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Derivation drv = derivationFromPath(store, i2.first);
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PathSet invalid;
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foreach (DerivationOutputs::iterator, j, drv.outputs)
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if (wantOutput(j->first, i2.second)
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&& !store.isValidPath(j->second.path))
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invalid.insert(j->second.path);
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if (invalid.empty()) continue;
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todoDrv.insert(*i);
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if (settings.useSubstitutes && !willBuildLocally(drv))
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query.insert(invalid.begin(), invalid.end());
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}
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else {
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if (store.isValidPath(*i)) continue;
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query.insert(*i);
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todoNonDrv.insert(*i);
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}
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}
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todo.clear();
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SubstitutablePathInfos infos;
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store.querySubstitutablePathInfos(query, infos);
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foreach (PathSet::iterator, i, todoDrv) {
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DrvPathWithOutputs i2 = parseDrvPathWithOutputs(*i);
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// FIXME: cache this
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Derivation drv = derivationFromPath(store, i2.first);
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PathSet outputs;
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bool mustBuild = false;
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if (settings.useSubstitutes && !willBuildLocally(drv)) {
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foreach (DerivationOutputs::iterator, j, drv.outputs) {
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if (!wantOutput(j->first, i2.second)) continue;
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if (!store.isValidPath(j->second.path)) {
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if (infos.find(j->second.path) == infos.end())
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mustBuild = true;
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else
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outputs.insert(j->second.path);
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}
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}
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} else
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mustBuild = true;
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if (mustBuild) {
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willBuild.insert(i2.first);
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todo.insert(drv.inputSrcs.begin(), drv.inputSrcs.end());
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foreach (DerivationInputs::iterator, j, drv.inputDrvs)
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todo.insert(makeDrvPathWithOutputs(j->first, j->second));
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} else
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todoNonDrv.insert(outputs.begin(), outputs.end());
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}
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foreach (PathSet::iterator, i, todoNonDrv) {
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done.insert(*i);
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SubstitutablePathInfos::iterator info = infos.find(*i);
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if (info != infos.end()) {
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willSubstitute.insert(*i);
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downloadSize += info->second.downloadSize;
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narSize += info->second.narSize;
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todo.insert(info->second.references.begin(), info->second.references.end());
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} else
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unknown.insert(*i);
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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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