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#include "make-content-addressed.hh"
#include "references.hh"
namespace nix {
std::map<StorePath, StorePath> makeContentAddressed(
Store & srcStore,
Store & dstStore,
const StorePathSet & storePaths)
{
StorePathSet closure;
srcStore.computeFSClosure(storePaths, closure);
auto paths = srcStore.topoSortPaths(closure);
std::reverse(paths.begin(), paths.end());
std::map<StorePath, StorePath> remappings;
for (auto & path : paths) {
auto pathS = srcStore.printStorePath(path);
auto oldInfo = srcStore.queryPathInfo(path);
std::string oldHashPart(path.hashPart());
StringSink sink;
srcStore.narFromPath(path, sink);
StringMap rewrites;
StorePathSet references;
bool hasSelfReference = false;
for (auto & ref : oldInfo->references) {
if (ref == path)
hasSelfReference = true;
else {
auto i = remappings.find(ref);
auto replacement = i != remappings.end() ? i->second : ref;
// FIXME: warn about unremapped paths?
if (replacement != ref)
rewrites.insert_or_assign(srcStore.printStorePath(ref), srcStore.printStorePath(replacement));
references.insert(std::move(replacement));
}
}
sink.s = rewriteStrings(sink.s, rewrites);
HashModuloSink hashModuloSink(htSHA256, oldHashPart);
hashModuloSink(sink.s);
auto narModuloHash = hashModuloSink.finish().first;
auto dstPath = dstStore.makeFixedOutputPath(
FileIngestionMethod::Recursive, narModuloHash, path.name(), references, hasSelfReference);
printInfo("rewriting '%s' to '%s'", pathS, srcStore.printStorePath(dstPath));
StringSink sink2;
RewritingSink rsink2(oldHashPart, std::string(dstPath.hashPart()), sink2);
rsink2(sink.s);
rsink2.flush();
ValidPathInfo info { dstPath, hashString(htSHA256, sink2.s) };
info.references = std::move(references);
if (hasSelfReference) info.references.insert(info.path);
info.narSize = sink.s.size();
info.ca = FixedOutputHash {
.method = FileIngestionMethod::Recursive,
.hash = narModuloHash,
};
StringSource source(sink2.s);
dstStore.addToStore(info, source);
remappings.insert_or_assign(std::move(path), std::move(info.path));
}
return remappings;
}
}
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