mirror of
https://github.com/NixOS/nix.git
synced 2025-11-09 12:06:01 +01:00
98 lines
3.1 KiB
C++
98 lines
3.1 KiB
C++
#include "nix/store/export-import.hh"
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#include "nix/util/serialise.hh"
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#include "nix/store/store-api.hh"
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#include "nix/util/archive.hh"
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#include "nix/store/common-protocol.hh"
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#include "nix/store/common-protocol-impl.hh"
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#include <algorithm>
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namespace nix {
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static void exportPath(Store & store, const StorePath & path, Sink & sink)
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{
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auto info = store.queryPathInfo(path);
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HashSink hashSink(HashAlgorithm::SHA256);
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TeeSink teeSink(sink, hashSink);
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store.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().hash;
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if (hash != info->narHash && info->narHash != Hash(info->narHash.algo))
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throw Error(
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"hash of path '%s' has changed from '%s' to '%s'!",
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store.printStorePath(path),
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info->narHash.to_string(HashFormat::Nix32, true),
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hash.to_string(HashFormat::Nix32, true));
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teeSink << exportMagic << store.printStorePath(path);
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CommonProto::write(store, CommonProto::WriteConn{.to = teeSink}, info->references);
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teeSink << (info->deriver ? store.printStorePath(*info->deriver) : "") << 0;
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}
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void exportPaths(Store & store, const StorePathSet & paths, Sink & sink)
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{
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auto sorted = store.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(store, path, sink);
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}
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sink << 0;
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}
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StorePaths importPaths(Store & store, 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)
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break;
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if (n != 1)
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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 = store.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(store, 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 = store.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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store.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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} // namespace nix
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