90 lines
2.6 KiB
C++
90 lines
2.6 KiB
C++
#include "make-content-addressed.hh"
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#include "references.hh"
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namespace nix {
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std::map<StorePath, StorePath> makeContentAddressed(
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Store & srcStore,
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Store & dstStore,
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const StorePathSet & storePaths)
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{
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StorePathSet closure;
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srcStore.computeFSClosure(storePaths, closure);
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auto paths = srcStore.topoSortPaths(closure);
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std::reverse(paths.begin(), paths.end());
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std::map<StorePath, StorePath> remappings;
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for (auto & path : paths) {
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auto pathS = srcStore.printStorePath(path);
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auto oldInfo = srcStore.queryPathInfo(path);
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std::string oldHashPart(path.hashPart());
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StringSink sink;
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sink << srcStore.narFromPath(path);
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StringMap rewrites;
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StoreReferences refs;
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for (auto & ref : oldInfo->references) {
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if (ref == path)
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refs.self = true;
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else {
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auto i = remappings.find(ref);
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auto replacement = i != remappings.end() ? i->second : ref;
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// FIXME: warn about unremapped paths?
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if (replacement != ref)
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rewrites.insert_or_assign(srcStore.printStorePath(ref), srcStore.printStorePath(replacement));
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refs.others.insert(std::move(replacement));
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}
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}
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sink.s = rewriteStrings(sink.s, rewrites);
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auto narModuloHash = [&] {
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StringSource source{sink.s};
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return computeHashModulo(htSHA256, oldHashPart, source).first;
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}();
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ValidPathInfo info {
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dstStore,
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path.name(),
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FixedOutputInfo {
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.method = FileIngestionMethod::Recursive,
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.hash = narModuloHash,
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.references = std::move(refs),
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},
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Hash::dummy,
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};
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printInfo("rewriting '%s' to '%s'", pathS, dstStore.printStorePath(info.path));
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const auto rewritten = rewriteStrings(sink.s, {{oldHashPart, std::string(info.path.hashPart())}});
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info.narHash = hashString(htSHA256, rewritten);
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info.narSize = sink.s.size();
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StringSource source(rewritten);
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dstStore.addToStore(info, source);
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remappings.insert_or_assign(std::move(path), std::move(info.path));
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}
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return remappings;
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}
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StorePath makeContentAddressed(
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Store & srcStore,
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Store & dstStore,
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const StorePath & fromPath)
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{
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auto remappings = makeContentAddressed(srcStore, dstStore, StorePathSet { fromPath });
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auto i = remappings.find(fromPath);
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assert(i != remappings.end());
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return i->second;
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}
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}
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