mirror of
https://github.com/NixOS/nix
synced 2025-06-26 20:01:15 +02:00
756758d968
Looks like some cruft has been left over from previous refactorings. This removes dead variables, which should not have side effects in their constructors. In cases where the variable initialization has a purpose [[maybe_unused]] is inserted to silence compiler warnings.
99 lines
2.9 KiB
C++
99 lines
2.9 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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for (auto & path : sorted) {
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sink << 1;
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exportPath(path, sink);
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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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