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15658b259f
The short answer for why we need to do this is so we can consistently do
`#include "nix/..."`. Without this change, there are ways to still make
that work, but they are hacky, and they have downsides such as making it
harder to make sure headers from the wrong Nix library (e..g.
`libnixexpr` headers in `libnixutil`) aren't being used.
The C API alraedy used `nix_api_*`, so its headers are *not* put in
subdirectories accordingly.
Progress on #7876
We resisted doing this for a while because it would be annoying to not
have the header source file pairs close by / easy to change file
path/name from one to the other. But I am ameliorating that with
symlinks in the next commit.
(cherry picked from commit f3e1c47f47)
99 lines
2.9 KiB
C++
99 lines
2.9 KiB
C++
#include "nix/serialise.hh"
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#include "nix/store-api.hh"
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#include "nix/archive.hh"
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#include "nix/common-protocol.hh"
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#include "nix/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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