105 lines
3.1 KiB
C++
105 lines
3.1 KiB
C++
#include "serialise.hh"
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#include "store-api.hh"
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#include "archive.hh"
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#include "common-protocol.hh"
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#include "common-protocol-impl.hh"
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#include <algorithm>
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namespace nix {
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void Store::exportPaths(const StorePathSet & paths, Sink & sink)
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{
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auto sorted = topoSortPaths(paths);
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std::reverse(sorted.begin(), sorted.end());
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std::string doneLabel("paths exported");
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//logger->incExpected(doneLabel, sorted.size());
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for (auto & path : sorted) {
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//Activity act(*logger, lvlInfo, "exporting path '%s'", path);
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sink << 1;
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exportPath(path, sink);
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//logger->incProgress(doneLabel);
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}
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sink << 0;
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}
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void Store::exportPath(const StorePath & path, Sink & sink)
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{
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auto info = queryPathInfo(path);
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HashSink hashSink(HashAlgorithm::SHA256);
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TeeSink teeSink(sink, hashSink);
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narFromPath(path, teeSink);
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/* Refuse to export paths that have changed. This prevents
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filesystem corruption from spreading to other machines.
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Don't complain if the stored hash is zero (unknown). */
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Hash hash = hashSink.currentHash().first;
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if (hash != info->narHash && info->narHash != Hash(info->narHash.algo))
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throw Error("hash of path '%s' has changed from '%s' to '%s'!",
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printStorePath(path), info->narHash.to_string(HashFormat::Nix32, true), hash.to_string(HashFormat::Nix32, true));
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teeSink
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<< exportMagic
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<< printStorePath(path);
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CommonProto::write(*this,
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CommonProto::WriteConn { .to = teeSink },
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info->references);
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teeSink
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<< (info->deriver ? printStorePath(*info->deriver) : "")
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<< 0;
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}
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StorePaths Store::importPaths(Source & source, CheckSigsFlag checkSigs)
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{
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StorePaths res;
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while (true) {
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auto n = readNum<uint64_t>(source);
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if (n == 0) break;
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if (n != 1) throw Error("input doesn't look like something created by 'nix-store --export'");
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/* Extract the NAR from the source. */
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StringSink saved;
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TeeSource tee { source, saved };
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NullFileSystemObjectSink ether;
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parseDump(ether, tee);
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uint32_t magic = readInt(source);
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if (magic != exportMagic)
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throw Error("Nix archive cannot be imported; wrong format");
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auto path = parseStorePath(readString(source));
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//Activity act(*logger, lvlInfo, "importing path '%s'", info.path);
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auto references = CommonProto::Serialise<StorePathSet>::read(*this,
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CommonProto::ReadConn { .from = source });
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auto deriver = readString(source);
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auto narHash = hashString(HashAlgorithm::SHA256, saved.s);
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ValidPathInfo info { path, narHash };
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if (deriver != "")
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info.deriver = parseStorePath(deriver);
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info.references = references;
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info.narSize = saved.s.size();
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// Ignore optional legacy signature.
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if (readInt(source) == 1)
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readString(source);
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// Can't use underlying source, which would have been exhausted
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auto source = StringSource(saved.s);
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addToStore(info, source, NoRepair, checkSigs);
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res.push_back(info.path);
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}
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return res;
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}
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}
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