forked from lix-project/lix
Git object hashing in libutil
This is the core functionality but just unit-tested and not yet made part of the store layer. This is because there is some tech debt around (a) repeated boilerplate hashing objects (b) better integration of the new `SourceAccessor` type that needs to be cleaned up first. Part of RFC 133 Co-Authored-By: Matthew Bauer <mjbauer95@gmail.com> Co-Authored-By: Carlo Nucera <carlo.nucera@protonmail.com> Co-authored-by: Robert Hensing <roberth@users.noreply.github.com> Co-authored-by: Florian Klink <flokli@flokli.de>
This commit is contained in:
parent
9afa697ab6
commit
20b95d6223
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@ -96,6 +96,14 @@ constexpr std::array<ExperimentalFeatureDetails, numXpFeatures> xpFeatureDetails
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[`nix`](@docroot@/command-ref/new-cli/nix.md) for details.
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)",
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},
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{
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.tag = Xp::GitHashing,
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.name = "git-hashing",
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.description = R"(
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Allow creating (content-addressed) store objects which are hashed via Git's hashing algorithm.
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These store objects will not be understandable by older versions of Nix.
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)",
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},
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{
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.tag = Xp::RecursiveNix,
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.name = "recursive-nix",
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@ -22,6 +22,7 @@ enum struct ExperimentalFeature
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Flakes,
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FetchTree,
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NixCommand,
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GitHashing,
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RecursiveNix,
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NoUrlLiterals,
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FetchClosure,
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@ -1,9 +1,263 @@
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#include "git.hh"
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#include <cerrno>
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#include <algorithm>
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#include <vector>
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#include <map>
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#include <regex>
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#include <strings.h> // for strcasecmp
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#include "signals.hh"
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#include "config.hh"
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#include "hash.hh"
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#include "posix-source-accessor.hh"
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#include "git.hh"
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#include "serialise.hh"
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namespace nix::git {
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using namespace nix;
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using namespace std::string_literals;
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std::optional<Mode> decodeMode(RawMode m) {
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switch (m) {
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case (RawMode) Mode::Directory:
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case (RawMode) Mode::Executable:
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case (RawMode) Mode::Regular:
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case (RawMode) Mode::Symlink:
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return (Mode) m;
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default:
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return std::nullopt;
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}
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}
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static std::string getStringUntil(Source & source, char byte)
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{
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std::string s;
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char n[1];
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source(std::string_view { n, 1 });
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while (*n != byte) {
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s += *n;
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source(std::string_view { n, 1 });
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}
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return s;
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}
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static std::string getString(Source & source, int n)
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{
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std::string v;
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v.resize(n);
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source(v);
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return v;
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}
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void parse(
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ParseSink & sink,
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const Path & sinkPath,
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Source & source,
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std::function<SinkHook> hook,
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const ExperimentalFeatureSettings & xpSettings)
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{
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xpSettings.require(Xp::GitHashing);
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auto type = getString(source, 5);
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if (type == "blob ") {
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sink.createRegularFile(sinkPath);
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unsigned long long size = std::stoi(getStringUntil(source, 0));
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sink.preallocateContents(size);
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unsigned long long left = size;
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std::string buf;
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buf.reserve(65536);
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while (left) {
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checkInterrupt();
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buf.resize(std::min((unsigned long long)buf.capacity(), left));
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source(buf);
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sink.receiveContents(buf);
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left -= buf.size();
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}
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} else if (type == "tree ") {
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unsigned long long size = std::stoi(getStringUntil(source, 0));
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unsigned long long left = size;
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sink.createDirectory(sinkPath);
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while (left) {
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std::string perms = getStringUntil(source, ' ');
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left -= perms.size();
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left -= 1;
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RawMode rawMode = std::stoi(perms, 0, 8);
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auto modeOpt = decodeMode(rawMode);
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if (!modeOpt)
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throw Error("Unknown Git permission: %o", perms);
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auto mode = std::move(*modeOpt);
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std::string name = getStringUntil(source, '\0');
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left -= name.size();
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left -= 1;
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std::string hashs = getString(source, 20);
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left -= 20;
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Hash hash(htSHA1);
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std::copy(hashs.begin(), hashs.end(), hash.hash);
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hook(name, TreeEntry {
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.mode = mode,
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.hash = hash,
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});
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if (mode == Mode::Executable)
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sink.isExecutable();
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}
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} else throw Error("input doesn't look like a Git object");
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}
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std::optional<Mode> convertMode(SourceAccessor::Type type)
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{
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switch (type) {
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case SourceAccessor::tSymlink: return Mode::Symlink;
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case SourceAccessor::tRegular: return Mode::Regular;
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case SourceAccessor::tDirectory: return Mode::Directory;
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case SourceAccessor::tMisc: return std::nullopt;
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default: abort();
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}
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}
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void restore(ParseSink & sink, Source & source, std::function<RestoreHook> hook)
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{
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parse(sink, "", source, [&](Path name, TreeEntry entry) {
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auto [accessor, from] = hook(entry.hash);
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auto stat = accessor->lstat(from);
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auto gotOpt = convertMode(stat.type);
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if (!gotOpt)
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throw Error("file '%s' (git hash %s) has an unsupported type",
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from,
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entry.hash.to_string(HashFormat::Base16, false));
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auto & got = *gotOpt;
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if (got != entry.mode)
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throw Error("git mode of file '%s' (git hash %s) is %o but expected %o",
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from,
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entry.hash.to_string(HashFormat::Base16, false),
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(RawMode) got,
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(RawMode) entry.mode);
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copyRecursive(
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*accessor, from,
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sink, name);
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});
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}
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void dumpBlobPrefix(
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uint64_t size, Sink & sink,
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const ExperimentalFeatureSettings & xpSettings)
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{
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xpSettings.require(Xp::GitHashing);
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auto s = fmt("blob %d\0"s, std::to_string(size));
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sink(s);
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}
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void dumpTree(const Tree & entries, Sink & sink,
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const ExperimentalFeatureSettings & xpSettings)
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{
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xpSettings.require(Xp::GitHashing);
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std::string v1;
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for (auto & [name, entry] : entries) {
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auto name2 = name;
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if (entry.mode == Mode::Directory) {
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assert(name2.back() == '/');
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name2.pop_back();
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}
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v1 += fmt("%o %s\0"s, static_cast<RawMode>(entry.mode), name2);
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std::copy(entry.hash.hash, entry.hash.hash + entry.hash.hashSize, std::back_inserter(v1));
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}
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{
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auto s = fmt("tree %d\0"s, v1.size());
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sink(s);
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}
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sink(v1);
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}
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Mode dump(
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SourceAccessor & accessor, const CanonPath & path,
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Sink & sink,
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std::function<DumpHook> hook,
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PathFilter & filter,
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const ExperimentalFeatureSettings & xpSettings)
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{
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auto st = accessor.lstat(path);
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switch (st.type) {
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case SourceAccessor::tRegular:
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{
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accessor.readFile(path, sink, [&](uint64_t size) {
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dumpBlobPrefix(size, sink, xpSettings);
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});
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return st.isExecutable
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? Mode::Executable
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: Mode::Regular;
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}
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case SourceAccessor::tDirectory:
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{
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Tree entries;
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for (auto & [name, _] : accessor.readDirectory(path)) {
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auto child = path + name;
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if (!filter(child.abs())) continue;
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auto entry = hook(child);
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auto name2 = name;
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if (entry.mode == Mode::Directory)
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name2 += "/";
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entries.insert_or_assign(std::move(name2), std::move(entry));
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}
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dumpTree(entries, sink, xpSettings);
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return Mode::Directory;
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}
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case SourceAccessor::tSymlink:
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case SourceAccessor::tMisc:
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default:
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throw Error("file '%1%' has an unsupported type", path);
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}
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}
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TreeEntry dumpHash(
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HashType ht,
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SourceAccessor & accessor, const CanonPath & path, PathFilter & filter)
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{
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std::function<DumpHook> hook;
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hook = [&](const CanonPath & path) -> TreeEntry {
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auto hashSink = HashSink(ht);
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auto mode = dump(accessor, path, hashSink, hook, filter);
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auto hash = hashSink.finish().first;
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return {
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.mode = mode,
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.hash = hash,
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};
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};
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return hook(path);
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}
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namespace nix {
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namespace git {
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std::optional<LsRemoteRefLine> parseLsRemoteLine(std::string_view line)
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{
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@ -22,4 +276,3 @@ std::optional<LsRemoteRefLine> parseLsRemoteLine(std::string_view line)
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}
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}
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}
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@ -5,9 +5,127 @@
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#include <string_view>
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#include <optional>
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namespace nix {
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#include "types.hh"
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#include "serialise.hh"
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#include "hash.hh"
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#include "source-accessor.hh"
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#include "fs-sink.hh"
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namespace git {
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namespace nix::git {
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using RawMode = uint32_t;
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enum struct Mode : RawMode {
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Directory = 0040000,
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Executable = 0100755,
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Regular = 0100644,
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Symlink = 0120000,
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};
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std::optional<Mode> decodeMode(RawMode m);
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/**
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* An anonymous Git tree object entry (no name part).
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*/
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struct TreeEntry
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{
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Mode mode;
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Hash hash;
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GENERATE_CMP(TreeEntry, me->mode, me->hash);
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};
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/**
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* A Git tree object, fully decoded and stored in memory.
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*
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* Directory names must end in a `/` for sake of sorting. See
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* https://github.com/mirage/irmin/issues/352
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*/
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using Tree = std::map<std::string, TreeEntry>;
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/**
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* Callback for processing a child hash with `parse`
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*
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* The function should
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*
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* 1. Obtain the file system objects denoted by `gitHash`
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*
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* 2. Ensure they match `mode`
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*
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* 3. Feed them into the same sink `parse` was called with
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*
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* Implementations may seek to memoize resources (bandwidth, storage,
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* etc.) for the same Git hash.
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*/
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using SinkHook = void(const Path & name, TreeEntry entry);
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void parse(
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ParseSink & sink, const Path & sinkPath,
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Source & source,
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std::function<SinkHook> hook,
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const ExperimentalFeatureSettings & xpSettings = experimentalFeatureSettings);
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/**
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* Assists with writing a `SinkHook` step (2).
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*/
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std::optional<Mode> convertMode(SourceAccessor::Type type);
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/**
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* Simplified version of `SinkHook` for `restore`.
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*
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* Given a `Hash`, return a `SourceAccessor` and `CanonPath` pointing to
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* the file system object with that path.
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*/
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using RestoreHook = std::pair<SourceAccessor *, CanonPath>(Hash);
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/**
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* Wrapper around `parse` and `RestoreSink`
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*/
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void restore(ParseSink & sink, Source & source, std::function<RestoreHook> hook);
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/**
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* Dumps a single file to a sink
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*
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* @param xpSettings for testing purposes
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*/
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void dumpBlobPrefix(
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uint64_t size, Sink & sink,
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const ExperimentalFeatureSettings & xpSettings = experimentalFeatureSettings);
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/**
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* Dumps a representation of a git tree to a sink
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*/
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void dumpTree(
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const Tree & entries, Sink & sink,
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const ExperimentalFeatureSettings & xpSettings = experimentalFeatureSettings);
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/**
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* Callback for processing a child with `dump`
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*
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* The function should return the Git hash and mode of the file at the
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* given path in the accessor passed to `dump`.
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*
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* Note that if the child is a directory, its child in must also be so
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* processed in order to compute this information.
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*/
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using DumpHook = TreeEntry(const CanonPath & path);
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Mode dump(
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SourceAccessor & accessor, const CanonPath & path,
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Sink & sink,
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std::function<DumpHook> hook,
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PathFilter & filter = defaultPathFilter,
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const ExperimentalFeatureSettings & xpSettings = experimentalFeatureSettings);
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/**
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* Recursively dumps path, hashing as we go.
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*
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* A smaller wrapper around `dump`.
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*/
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TreeEntry dumpHash(
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HashType ht,
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SourceAccessor & accessor, const CanonPath & path,
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PathFilter & filter = defaultPathFilter);
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/**
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* A line from the output of `git ls-remote --symref`.
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@ -16,14 +134,16 @@ namespace git {
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*
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* - Symbolic references of the form
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*
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* ```
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* ref: {target} {reference}
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*
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* ```
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* where {target} is itself a reference and {reference} is optional
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*
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* - Object references of the form
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*
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* ```
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* {target} {reference}
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*
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* ```
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* where {target} is a commit id and {reference} is mandatory
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*/
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struct LsRemoteRefLine {
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@ -36,8 +156,9 @@ struct LsRemoteRefLine {
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std::optional<std::string> reference;
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};
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/**
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* Parse an `LsRemoteRefLine`
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*/
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std::optional<LsRemoteRefLine> parseLsRemoteLine(std::string_view line);
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}
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}
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|
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@ -74,6 +74,10 @@ void Source::operator () (char * data, size_t len)
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}
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}
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void Source::operator () (std::string_view data)
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{
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(*this)((char *)data.data(), data.size());
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}
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void Source::drainInto(Sink & sink)
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{
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|
|
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@ -73,6 +73,7 @@ struct Source
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* an error if it is not going to be available.
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*/
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void operator () (char * data, size_t len);
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void operator () (std::string_view data);
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/**
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* Store up to ‘len’ in the buffer pointed to by ‘data’, and
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|
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@ -1,33 +1,236 @@
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#include "git.hh"
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#include <gtest/gtest.h>
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#include "git.hh"
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#include "memory-source-accessor.hh"
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#include "tests/characterization.hh"
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namespace nix {
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using namespace git;
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class GitTest : public CharacterizationTest
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{
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Path unitTestData = getUnitTestData() + "/libutil/git";
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public:
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Path goldenMaster(std::string_view testStem) const override {
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return unitTestData + "/" + testStem;
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}
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/**
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* We set these in tests rather than the regular globals so we don't have
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* to worry about race conditions if the tests run concurrently.
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*/
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ExperimentalFeatureSettings mockXpSettings;
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private:
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void SetUp() override
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{
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mockXpSettings.set("experimental-features", "git-hashing");
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}
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};
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TEST(GitMode, gitMode_directory) {
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Mode m = Mode::Directory;
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RawMode r = 0040000;
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ASSERT_EQ(static_cast<RawMode>(m), r);
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ASSERT_EQ(decodeMode(r), std::optional { m });
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};
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TEST(GitMode, gitMode_executable) {
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Mode m = Mode::Executable;
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RawMode r = 0100755;
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ASSERT_EQ(static_cast<RawMode>(m), r);
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ASSERT_EQ(decodeMode(r), std::optional { m });
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};
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TEST(GitMode, gitMode_regular) {
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Mode m = Mode::Regular;
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||||
RawMode r = 0100644;
|
||||
ASSERT_EQ(static_cast<RawMode>(m), r);
|
||||
ASSERT_EQ(decodeMode(r), std::optional { m });
|
||||
};
|
||||
|
||||
TEST(GitMode, gitMode_symlink) {
|
||||
Mode m = Mode::Symlink;
|
||||
RawMode r = 0120000;
|
||||
ASSERT_EQ(static_cast<RawMode>(m), r);
|
||||
ASSERT_EQ(decodeMode(r), std::optional { m });
|
||||
};
|
||||
|
||||
TEST_F(GitTest, blob_read) {
|
||||
readTest("hello-world-blob.bin", [&](const auto & encoded) {
|
||||
StringSource in { encoded };
|
||||
StringSink out;
|
||||
RegularFileSink out2 { out };
|
||||
parse(out2, "", in, [](auto &, auto) {}, mockXpSettings);
|
||||
|
||||
auto expected = readFile(goldenMaster("hello-world.bin"));
|
||||
|
||||
ASSERT_EQ(out.s, expected);
|
||||
});
|
||||
}
|
||||
|
||||
TEST_F(GitTest, blob_write) {
|
||||
writeTest("hello-world-blob.bin", [&]() {
|
||||
auto decoded = readFile(goldenMaster("hello-world.bin"));
|
||||
StringSink s;
|
||||
dumpBlobPrefix(decoded.size(), s, mockXpSettings);
|
||||
s(decoded);
|
||||
return s.s;
|
||||
});
|
||||
}
|
||||
|
||||
/**
|
||||
* This data is for "shallow" tree tests. However, we use "real" hashes
|
||||
* so that we can check our test data in the corresponding functional
|
||||
* test (`git-hashing/unit-test-data`).
|
||||
*/
|
||||
const static Tree tree = {
|
||||
{
|
||||
"Foo",
|
||||
{
|
||||
.mode = Mode::Regular,
|
||||
// hello world with special chars from above
|
||||
.hash = Hash::parseAny("63ddb340119baf8492d2da53af47e8c7cfcd5eb2", htSHA1),
|
||||
},
|
||||
},
|
||||
{
|
||||
"bAr",
|
||||
{
|
||||
.mode = Mode::Executable,
|
||||
// ditto
|
||||
.hash = Hash::parseAny("63ddb340119baf8492d2da53af47e8c7cfcd5eb2", htSHA1),
|
||||
},
|
||||
},
|
||||
{
|
||||
"baZ/",
|
||||
{
|
||||
.mode = Mode::Directory,
|
||||
// Empty directory hash
|
||||
.hash = Hash::parseAny("4b825dc642cb6eb9a060e54bf8d69288fbee4904", htSHA1),
|
||||
},
|
||||
},
|
||||
};
|
||||
|
||||
TEST_F(GitTest, tree_read) {
|
||||
readTest("tree.bin", [&](const auto & encoded) {
|
||||
StringSource in { encoded };
|
||||
NullParseSink out;
|
||||
Tree got;
|
||||
parse(out, "", in, [&](auto & name, auto entry) {
|
||||
auto name2 = name;
|
||||
if (entry.mode == Mode::Directory)
|
||||
name2 += '/';
|
||||
got.insert_or_assign(name2, std::move(entry));
|
||||
}, mockXpSettings);
|
||||
|
||||
ASSERT_EQ(got, tree);
|
||||
});
|
||||
}
|
||||
|
||||
TEST_F(GitTest, tree_write) {
|
||||
writeTest("tree.bin", [&]() {
|
||||
StringSink s;
|
||||
dumpTree(tree, s, mockXpSettings);
|
||||
return s.s;
|
||||
});
|
||||
}
|
||||
|
||||
TEST_F(GitTest, both_roundrip) {
|
||||
using File = MemorySourceAccessor::File;
|
||||
|
||||
MemorySourceAccessor files;
|
||||
files.root = File::Directory {
|
||||
.contents {
|
||||
{
|
||||
"foo",
|
||||
File::Regular {
|
||||
.contents = "hello\n\0\n\tworld!",
|
||||
},
|
||||
},
|
||||
{
|
||||
"bar",
|
||||
File::Directory {
|
||||
.contents = {
|
||||
{
|
||||
"baz",
|
||||
File::Regular {
|
||||
.executable = true,
|
||||
.contents = "good day,\n\0\n\tworld!",
|
||||
},
|
||||
},
|
||||
},
|
||||
},
|
||||
},
|
||||
},
|
||||
};
|
||||
|
||||
std::map<Hash, std::string> cas;
|
||||
|
||||
std::function<DumpHook> dumpHook;
|
||||
dumpHook = [&](const CanonPath & path) {
|
||||
StringSink s;
|
||||
HashSink hashSink { htSHA1 };
|
||||
TeeSink s2 { s, hashSink };
|
||||
auto mode = dump(
|
||||
files, path, s2, dumpHook,
|
||||
defaultPathFilter, mockXpSettings);
|
||||
auto hash = hashSink.finish().first;
|
||||
cas.insert_or_assign(hash, std::move(s.s));
|
||||
return TreeEntry {
|
||||
.mode = mode,
|
||||
.hash = hash,
|
||||
};
|
||||
};
|
||||
|
||||
auto root = dumpHook(CanonPath::root);
|
||||
|
||||
MemorySourceAccessor files2;
|
||||
|
||||
MemorySink sinkFiles2 { files2 };
|
||||
|
||||
std::function<void(const Path, const Hash &)> mkSinkHook;
|
||||
mkSinkHook = [&](const Path prefix, const Hash & hash) {
|
||||
StringSource in { cas[hash] };
|
||||
parse(sinkFiles2, prefix, in, [&](const Path & name, const auto & entry) {
|
||||
mkSinkHook(prefix + "/" + name, entry.hash);
|
||||
}, mockXpSettings);
|
||||
};
|
||||
|
||||
mkSinkHook("", root.hash);
|
||||
|
||||
ASSERT_EQ(files, files2);
|
||||
}
|
||||
|
||||
TEST(GitLsRemote, parseSymrefLineWithReference) {
|
||||
auto line = "ref: refs/head/main HEAD";
|
||||
auto res = git::parseLsRemoteLine(line);
|
||||
auto res = parseLsRemoteLine(line);
|
||||
ASSERT_TRUE(res.has_value());
|
||||
ASSERT_EQ(res->kind, git::LsRemoteRefLine::Kind::Symbolic);
|
||||
ASSERT_EQ(res->kind, LsRemoteRefLine::Kind::Symbolic);
|
||||
ASSERT_EQ(res->target, "refs/head/main");
|
||||
ASSERT_EQ(res->reference, "HEAD");
|
||||
}
|
||||
|
||||
TEST(GitLsRemote, parseSymrefLineWithNoReference) {
|
||||
auto line = "ref: refs/head/main";
|
||||
auto res = git::parseLsRemoteLine(line);
|
||||
auto res = parseLsRemoteLine(line);
|
||||
ASSERT_TRUE(res.has_value());
|
||||
ASSERT_EQ(res->kind, git::LsRemoteRefLine::Kind::Symbolic);
|
||||
ASSERT_EQ(res->kind, LsRemoteRefLine::Kind::Symbolic);
|
||||
ASSERT_EQ(res->target, "refs/head/main");
|
||||
ASSERT_EQ(res->reference, std::nullopt);
|
||||
}
|
||||
|
||||
TEST(GitLsRemote, parseObjectRefLine) {
|
||||
auto line = "abc123 refs/head/main";
|
||||
auto res = git::parseLsRemoteLine(line);
|
||||
auto res = parseLsRemoteLine(line);
|
||||
ASSERT_TRUE(res.has_value());
|
||||
ASSERT_EQ(res->kind, git::LsRemoteRefLine::Kind::Object);
|
||||
ASSERT_EQ(res->kind, LsRemoteRefLine::Kind::Object);
|
||||
ASSERT_EQ(res->target, "abc123");
|
||||
ASSERT_EQ(res->reference, "refs/head/main");
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
|
|
|
@ -27,3 +27,7 @@ libutil-tests_CXXFLAGS += -I src/libutil
|
|||
libutil-tests_LIBS = libutil
|
||||
|
||||
libutil-tests_LDFLAGS := -lrapidcheck $(GTEST_LIBS)
|
||||
|
||||
check: unit-test-data/libutil/git/check-data.sh.test
|
||||
|
||||
$(eval $(call run-test,unit-test-data/libutil/git/check-data.sh))
|
||||
|
|
31
unit-test-data/libutil/git/check-data.sh
Normal file
31
unit-test-data/libutil/git/check-data.sh
Normal file
|
@ -0,0 +1,31 @@
|
|||
#!/usr/bin/env bash
|
||||
|
||||
set -eu -o pipefail
|
||||
|
||||
export TEST_ROOT=$(realpath ${TMPDIR:-/tmp}/nix-test)/git-hashing/unit-test-data
|
||||
mkdir -p $TEST_ROOT
|
||||
|
||||
repo="$TEST_ROOT/scratch"
|
||||
git init "$repo"
|
||||
|
||||
git -C "$repo" config user.email "you@example.com"
|
||||
git -C "$repo" config user.name "Your Name"
|
||||
|
||||
# `-w` to write for tree test
|
||||
freshlyAddedHash=$(git -C "$repo" hash-object -w -t blob --stdin < "./hello-world.bin")
|
||||
encodingHash=$(sha1sum -b < "./hello-world-blob.bin" | head -c 40)
|
||||
|
||||
# If the hashes match, then `hello-world-blob.bin` must be the encoding
|
||||
# of `hello-world.bin`.
|
||||
[[ "$encodingHash" == "$freshlyAddedHash" ]]
|
||||
|
||||
# Create empty directory object for tree test
|
||||
echo -n | git -C "$repo" hash-object -w -t tree --stdin
|
||||
|
||||
# Relies on both child hashes already existing in the git store
|
||||
freshlyAddedHash=$(git -C "$repo" mktree < "./tree.txt")
|
||||
encodingHash=$(sha1sum -b < "./tree.bin" | head -c 40)
|
||||
|
||||
# If the hashes match, then `tree.bin` must be the encoding of the
|
||||
# directory denoted by `tree.txt` interpreted as git directory listing.
|
||||
[[ "$encodingHash" == "$freshlyAddedHash" ]]
|
BIN
unit-test-data/libutil/git/hello-world-blob.bin
Normal file
BIN
unit-test-data/libutil/git/hello-world-blob.bin
Normal file
Binary file not shown.
BIN
unit-test-data/libutil/git/hello-world.bin
Normal file
BIN
unit-test-data/libutil/git/hello-world.bin
Normal file
Binary file not shown.
BIN
unit-test-data/libutil/git/tree.bin
Normal file
BIN
unit-test-data/libutil/git/tree.bin
Normal file
Binary file not shown.
3
unit-test-data/libutil/git/tree.txt
Normal file
3
unit-test-data/libutil/git/tree.txt
Normal file
|
@ -0,0 +1,3 @@
|
|||
100644 blob 63ddb340119baf8492d2da53af47e8c7cfcd5eb2 Foo
|
||||
100755 blob 63ddb340119baf8492d2da53af47e8c7cfcd5eb2 bAr
|
||||
040000 tree 4b825dc642cb6eb9a060e54bf8d69288fbee4904 baZ
|
Loading…
Reference in a new issue