c922e73c11
Flake lock file updates:
• Updated input 'nix':
'github:NixOS/nix/f5f4de6a550327b4b1a06123c2e450f1b92c73b6' (2023-10-02)
→ 'github:NixOS/nix/50f8f1c8bc019a4c0fd098b9ac674b94cfc6af0d' (2023-11-27)
89 lines
2.3 KiB
C++
89 lines
2.3 KiB
C++
#include "nar-extractor.hh"
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#include "archive.hh"
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#include <unordered_set>
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using namespace nix;
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struct Extractor : ParseSink
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{
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std::unordered_set<Path> filesToKeep {
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"/nix-support/hydra-build-products",
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"/nix-support/hydra-release-name",
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"/nix-support/hydra-metrics",
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};
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NarMemberDatas & members;
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NarMemberData * curMember = nullptr;
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Path prefix;
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Extractor(NarMemberDatas & members, const Path & prefix)
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: members(members), prefix(prefix)
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{ }
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void createDirectory(const Path & path) override
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{
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members.insert_or_assign(prefix + path, NarMemberData { .type = SourceAccessor::Type::tDirectory });
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}
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void createRegularFile(const Path & path) override
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{
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curMember = &members.insert_or_assign(prefix + path, NarMemberData {
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.type = SourceAccessor::Type::tRegular,
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.fileSize = 0,
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.contents = filesToKeep.count(path) ? std::optional("") : std::nullopt,
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}).first->second;
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}
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std::optional<uint64_t> expectedSize;
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std::unique_ptr<HashSink> hashSink;
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void preallocateContents(uint64_t size) override
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{
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expectedSize = size;
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hashSink = std::make_unique<HashSink>(htSHA256);
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}
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void receiveContents(std::string_view data) override
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{
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assert(expectedSize);
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assert(curMember);
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assert(hashSink);
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*curMember->fileSize += data.size();
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(*hashSink)(data);
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if (curMember->contents) {
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curMember->contents->append(data);
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}
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assert(curMember->fileSize <= expectedSize);
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if (curMember->fileSize == expectedSize) {
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auto [hash, len] = hashSink->finish();
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assert(curMember->fileSize == len);
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curMember->sha256 = hash;
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hashSink.reset();
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}
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}
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void createSymlink(const Path & path, const std::string & target) override
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{
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members.insert_or_assign(prefix + path, NarMemberData { .type = SourceAccessor::Type::tSymlink });
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}
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void isExecutable() override
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{ }
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void closeRegularFile() override
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{ }
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};
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void extractNarData(
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Source & source,
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const Path & prefix,
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NarMemberDatas & members)
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{
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Extractor extractor(members, prefix);
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parseDump(extractor, source);
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// Note: this point may not be reached if we're in a coroutine.
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}
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