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#include "misc.hh"
#include "store-api.hh"
#include "local-store.hh"
#include <aterm2.h>
namespace nix {
Derivation derivationFromPath(const Path & drvPath)
{
assertStorePath(drvPath);
store->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, bool flipDirection)
{
if (paths.find(storePath) != paths.end()) return;
paths.insert(storePath);
PathSet references;
if (flipDirection)
store->queryReferrers(storePath, references);
else
store->queryReferences(storePath, references);
for (PathSet::iterator i = references.begin();
i != references.end(); ++i)
computeFSClosure(*i, paths, flipDirection);
}
Path findOutput(const Derivation & drv, string id)
{
for (DerivationOutputs::const_iterator i = drv.outputs.begin();
i != drv.outputs.end(); ++i)
if (i->first == id) return i->second.path;
throw Error(format("derivation has no output `%1%'") % id);
}
void queryMissing(const PathSet & targets,
PathSet & willBuild, PathSet & willSubstitute, PathSet & unknown)
{
PathSet todo(targets.begin(), targets.end()), done;
while (!todo.empty()) {
Path p = *(todo.begin());
todo.erase(p);
if (done.find(p) != done.end()) continue;
done.insert(p);
if (isDerivation(p)) {
if (!store->isValidPath(p)) {
unknown.insert(p);
continue;
}
Derivation drv = derivationFromPath(p);
bool mustBuild = false;
for (DerivationOutputs::iterator i = drv.outputs.begin();
i != drv.outputs.end(); ++i)
if (!store->isValidPath(i->second.path) && !store->hasSubstitutes(i->second.path))
mustBuild = true;
if (mustBuild) {
willBuild.insert(p);
todo.insert(drv.inputSrcs.begin(), drv.inputSrcs.end());
for (DerivationInputs::iterator i = drv.inputDrvs.begin();
i != drv.inputDrvs.end(); ++i)
todo.insert(i->first);
} else
for (DerivationOutputs::iterator i = drv.outputs.begin();
i != drv.outputs.end(); ++i)
todo.insert(i->second.path);
}
else {
if (store->isValidPath(p)) continue;
SubstitutablePathInfo info;
if (store->querySubstitutablePathInfo(p, info)) {
willSubstitute.insert(p);
todo.insert(info.references.begin(), info.references.end());
} else
unknown.insert(p);
}
}
}
}
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