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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;
sink << srcStore.narFromPath(path);
StringMap rewrites;
StoreReferences refs;
for (auto & ref : oldInfo->references) {
if (ref == path)
refs.self = 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));
refs.others.insert(std::move(replacement));
}
}
sink.s = rewriteStrings(sink.s, rewrites);
auto narModuloHash = [&] {
StringSource source{sink.s};
return computeHashModulo(htSHA256, oldHashPart, source).first;
}();
ValidPathInfo info {
dstStore,
path.name(),
FixedOutputInfo {
.method = FileIngestionMethod::Recursive,
.hash = narModuloHash,
.references = std::move(refs),
},
Hash::dummy,
};
printInfo("rewriting '%s' to '%s'", pathS, dstStore.printStorePath(info.path));
const auto rewritten = rewriteStrings(sink.s, {{oldHashPart, std::string(info.path.hashPart())}});
info.narHash = hashString(htSHA256, rewritten);
info.narSize = sink.s.size();
StringSource source(rewritten);
dstStore.addToStore(info, source);
remappings.insert_or_assign(std::move(path), std::move(info.path));
}
return remappings;
}
StorePath makeContentAddressed(
Store & srcStore,
Store & dstStore,
const StorePath & fromPath)
{
auto remappings = makeContentAddressed(srcStore, dstStore, StorePathSet { fromPath });
auto i = remappings.find(fromPath);
assert(i != remappings.end());
return i->second;
}
}
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