forked from lix-project/lix
650 lines
19 KiB
C++
650 lines
19 KiB
C++
#include "derivations.hh"
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#include "store-api.hh"
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#include "globals.hh"
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#include "util.hh"
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#include "worker-protocol.hh"
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#include "fs-accessor.hh"
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namespace nix {
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std::optional<StorePath> DerivationOutput::pathOpt(const Store & store, std::string_view drvName) const
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{
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return std::visit(overloaded {
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[](DerivationOutputInputAddressed doi) -> std::optional<StorePath> {
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return { doi.path };
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},
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[&](DerivationOutputFixed dof) -> std::optional<StorePath> {
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return {
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store.makeFixedOutputPath(dof.hash.method, dof.hash.hash, drvName)
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};
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},
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[](DerivationOutputFloating dof) -> std::optional<StorePath> {
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return std::nullopt;
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},
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}, output);
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}
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bool derivationIsCA(DerivationType dt) {
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switch (dt) {
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case DerivationType::Regular: return false;
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case DerivationType::CAFixed: return true;
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};
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// Since enums can have non-variant values, but making a `default:` would
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// disable exhaustiveness warnings.
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abort();
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}
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bool derivationIsFixed(DerivationType dt) {
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switch (dt) {
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case DerivationType::Regular: return false;
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case DerivationType::CAFixed: return true;
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};
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abort();
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}
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bool derivationIsImpure(DerivationType dt) {
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switch (dt) {
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case DerivationType::Regular: return false;
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case DerivationType::CAFixed: return true;
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};
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abort();
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}
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const StorePath BasicDerivation::findOutput(const Store & store, const string & id) const
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{
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auto i = outputs.find(id);
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if (i == outputs.end())
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throw Error("derivation has no output '%s'", id);
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return i->second.path(store, name);
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}
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bool BasicDerivation::isBuiltin() const
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{
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return string(builder, 0, 8) == "builtin:";
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}
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StorePath writeDerivation(ref<Store> store,
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const Derivation & drv, std::string_view name, RepairFlag repair)
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{
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auto references = drv.inputSrcs;
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for (auto & i : drv.inputDrvs)
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references.insert(i.first);
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/* Note that the outputs of a derivation are *not* references
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(that can be missing (of course) and should not necessarily be
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held during a garbage collection). */
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auto suffix = std::string(name) + drvExtension;
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auto contents = drv.unparse(*store, false);
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return settings.readOnlyMode
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? store->computeStorePathForText(suffix, contents, references)
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: store->addTextToStore(suffix, contents, references, repair);
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}
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/* Read string `s' from stream `str'. */
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static void expect(std::istream & str, const string & s)
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{
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char s2[s.size()];
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str.read(s2, s.size());
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if (string(s2, s.size()) != s)
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throw FormatError("expected string '%1%'", s);
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}
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/* Read a C-style string from stream `str'. */
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static string parseString(std::istream & str)
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{
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string res;
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expect(str, "\"");
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int c;
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while ((c = str.get()) != '"')
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if (c == '\\') {
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c = str.get();
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if (c == 'n') res += '\n';
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else if (c == 'r') res += '\r';
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else if (c == 't') res += '\t';
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else res += c;
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}
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else res += c;
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return res;
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}
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static Path parsePath(std::istream & str)
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{
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string s = parseString(str);
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if (s.size() == 0 || s[0] != '/')
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throw FormatError("bad path '%1%' in derivation", s);
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return s;
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}
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static bool endOfList(std::istream & str)
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{
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if (str.peek() == ',') {
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str.get();
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return false;
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}
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if (str.peek() == ']') {
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str.get();
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return true;
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}
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return false;
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}
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static StringSet parseStrings(std::istream & str, bool arePaths)
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{
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StringSet res;
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while (!endOfList(str))
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res.insert(arePaths ? parsePath(str) : parseString(str));
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return res;
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}
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static DerivationOutput parseDerivationOutput(const Store & store, std::istringstream & str)
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{
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expect(str, ","); auto path = store.parseStorePath(parsePath(str));
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expect(str, ","); auto hashAlgo = parseString(str);
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expect(str, ","); const auto hash = parseString(str);
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expect(str, ")");
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if (hashAlgo != "") {
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auto method = FileIngestionMethod::Flat;
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if (string(hashAlgo, 0, 2) == "r:") {
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method = FileIngestionMethod::Recursive;
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hashAlgo = string(hashAlgo, 2);
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}
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const HashType hashType = parseHashType(hashAlgo);
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return hash != ""
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? DerivationOutput {
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.output = DerivationOutputFixed {
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.hash = FixedOutputHash {
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.method = std::move(method),
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.hash = Hash(hash, hashType),
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},
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}
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}
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: DerivationOutput {
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.output = DerivationOutputFloating {
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.method = std::move(method),
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.hashType = std::move(hashType),
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},
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};
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} else
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return DerivationOutput {
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.output = DerivationOutputInputAddressed {
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.path = std::move(path),
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}
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};
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}
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static Derivation parseDerivation(const Store & store, std::string && s, std::string_view name)
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{
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Derivation drv;
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drv.name = name;
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std::istringstream str(std::move(s));
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expect(str, "Derive([");
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/* Parse the list of outputs. */
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while (!endOfList(str)) {
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expect(str, "("); std::string id = parseString(str);
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auto output = parseDerivationOutput(store, str);
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drv.outputs.emplace(std::move(id), std::move(output));
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}
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/* Parse the list of input derivations. */
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expect(str, ",[");
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while (!endOfList(str)) {
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expect(str, "(");
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Path drvPath = parsePath(str);
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expect(str, ",[");
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drv.inputDrvs.insert_or_assign(store.parseStorePath(drvPath), parseStrings(str, false));
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expect(str, ")");
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}
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expect(str, ",["); drv.inputSrcs = store.parseStorePathSet(parseStrings(str, true));
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expect(str, ","); drv.platform = parseString(str);
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expect(str, ","); drv.builder = parseString(str);
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/* Parse the builder arguments. */
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expect(str, ",[");
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while (!endOfList(str))
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drv.args.push_back(parseString(str));
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/* Parse the environment variables. */
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expect(str, ",[");
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while (!endOfList(str)) {
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expect(str, "("); string name = parseString(str);
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expect(str, ","); string value = parseString(str);
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expect(str, ")");
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drv.env[name] = value;
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}
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expect(str, ")");
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return drv;
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}
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Derivation readDerivation(const Store & store, const Path & drvPath, std::string_view name)
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{
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try {
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return parseDerivation(store, readFile(drvPath), name);
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} catch (FormatError & e) {
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throw Error("error parsing derivation '%1%': %2%", drvPath, e.msg());
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}
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}
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Derivation Store::derivationFromPath(const StorePath & drvPath)
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{
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ensurePath(drvPath);
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return readDerivation(drvPath);
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}
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Derivation Store::readDerivation(const StorePath & drvPath)
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{
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auto accessor = getFSAccessor();
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try {
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return parseDerivation(*this, accessor->readFile(printStorePath(drvPath)), Derivation::nameFromPath(drvPath));
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} catch (FormatError & e) {
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throw Error("error parsing derivation '%s': %s", printStorePath(drvPath), e.msg());
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}
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}
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static void printString(string & res, std::string_view s)
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{
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char buf[s.size() * 2 + 2];
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char * p = buf;
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*p++ = '"';
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for (auto c : s)
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if (c == '\"' || c == '\\') { *p++ = '\\'; *p++ = c; }
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else if (c == '\n') { *p++ = '\\'; *p++ = 'n'; }
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else if (c == '\r') { *p++ = '\\'; *p++ = 'r'; }
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else if (c == '\t') { *p++ = '\\'; *p++ = 't'; }
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else *p++ = c;
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*p++ = '"';
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res.append(buf, p - buf);
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}
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static void printUnquotedString(string & res, std::string_view s)
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{
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res += '"';
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res.append(s);
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res += '"';
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}
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template<class ForwardIterator>
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static void printStrings(string & res, ForwardIterator i, ForwardIterator j)
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{
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res += '[';
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bool first = true;
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for ( ; i != j; ++i) {
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if (first) first = false; else res += ',';
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printString(res, *i);
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}
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res += ']';
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}
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template<class ForwardIterator>
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static void printUnquotedStrings(string & res, ForwardIterator i, ForwardIterator j)
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{
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res += '[';
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bool first = true;
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for ( ; i != j; ++i) {
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if (first) first = false; else res += ',';
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printUnquotedString(res, *i);
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}
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res += ']';
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}
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string Derivation::unparse(const Store & store, bool maskOutputs,
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std::map<std::string, StringSet> * actualInputs) const
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{
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string s;
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s.reserve(65536);
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s += "Derive([";
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bool first = true;
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for (auto & i : outputs) {
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if (first) first = false; else s += ',';
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s += '('; printUnquotedString(s, i.first);
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s += ','; printUnquotedString(s, maskOutputs ? "" : store.printStorePath(i.second.path(store, name)));
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std::visit(overloaded {
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[&](DerivationOutputInputAddressed doi) {
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s += ','; printUnquotedString(s, "");
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s += ','; printUnquotedString(s, "");
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},
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[&](DerivationOutputFixed dof) {
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s += ','; printUnquotedString(s, dof.hash.printMethodAlgo());
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s += ','; printUnquotedString(s, dof.hash.hash.to_string(Base16, false));
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},
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[&](DerivationOutputFloating dof) {
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s += ','; printUnquotedString(s, makeFileIngestionPrefix(dof.method) + printHashType(dof.hashType));
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s += ','; printUnquotedString(s, "");
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},
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}, i.second.output);
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s += ')';
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}
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s += "],[";
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first = true;
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if (actualInputs) {
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for (auto & i : *actualInputs) {
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if (first) first = false; else s += ',';
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s += '('; printUnquotedString(s, i.first);
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s += ','; printUnquotedStrings(s, i.second.begin(), i.second.end());
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s += ')';
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}
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} else {
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for (auto & i : inputDrvs) {
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if (first) first = false; else s += ',';
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s += '('; printUnquotedString(s, store.printStorePath(i.first));
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s += ','; printUnquotedStrings(s, i.second.begin(), i.second.end());
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s += ')';
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}
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}
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s += "],";
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auto paths = store.printStorePathSet(inputSrcs); // FIXME: slow
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printUnquotedStrings(s, paths.begin(), paths.end());
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s += ','; printUnquotedString(s, platform);
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s += ','; printString(s, builder);
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s += ','; printStrings(s, args.begin(), args.end());
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s += ",[";
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first = true;
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for (auto & i : env) {
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if (first) first = false; else s += ',';
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s += '('; printString(s, i.first);
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s += ','; printString(s, maskOutputs && outputs.count(i.first) ? "" : i.second);
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s += ')';
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}
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s += "])";
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return s;
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}
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// FIXME: remove
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bool isDerivation(const string & fileName)
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{
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return hasSuffix(fileName, drvExtension);
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}
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DerivationType BasicDerivation::type() const
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{
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std::set<std::string_view> inputAddressedOutputs, fixedCAOutputs;
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for (auto & i : outputs) {
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std::visit(overloaded {
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[&](DerivationOutputInputAddressed _) {
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inputAddressedOutputs.insert(i.first);
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},
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[&](DerivationOutputFixed _) {
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fixedCAOutputs.insert(i.first);
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},
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[&](DerivationOutputFloating _) {
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throw Error("Floating CA output derivations are not yet implemented");
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},
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}, i.second.output);
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}
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if (inputAddressedOutputs.empty() && fixedCAOutputs.empty()) {
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throw Error("Must have at least one output");
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} else if (! inputAddressedOutputs.empty() && fixedCAOutputs.empty()) {
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return DerivationType::Regular;
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} else if (inputAddressedOutputs.empty() && ! fixedCAOutputs.empty()) {
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if (fixedCAOutputs.size() > 1)
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// FIXME: Experimental feature?
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throw Error("Only one fixed output is allowed for now");
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if (*fixedCAOutputs.begin() != "out")
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throw Error("Single fixed output must be named \"out\"");
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return DerivationType::CAFixed;
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} else {
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throw Error("Can't mix derivation output types");
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}
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}
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DrvHashes drvHashes;
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/* pathDerivationModulo and hashDerivationModulo are mutually recursive
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*/
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/* Look up the derivation by value and memoize the
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`hashDerivationModulo` call.
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*/
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static const DrvHashModulo & pathDerivationModulo(Store & store, const StorePath & drvPath)
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{
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auto h = drvHashes.find(drvPath);
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if (h == drvHashes.end()) {
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assert(store.isValidPath(drvPath));
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// Cache it
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h = drvHashes.insert_or_assign(
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drvPath,
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hashDerivationModulo(
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store,
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store.readDerivation(drvPath),
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false)).first;
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}
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return h->second;
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}
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/* See the header for interface details. These are the implementation details.
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For fixed-output derivations, each hash in the map is not the
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corresponding output's content hash, but a hash of that hash along
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with other constant data. The key point is that the value is a pure
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function of the output's contents, and there are no preimage attacks
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either spoofing an output's contents for a derivation, or
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spoofing a derivation for an output's contents.
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For regular derivations, it looks up each subderivation from its hash
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and recurs. If the subderivation is also regular, it simply
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substitutes the derivation path with its hash. If the subderivation
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is fixed-output, however, it takes each output hash and pretends it
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is a derivation hash producing a single "out" output. This is so we
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don't leak the provenance of fixed outputs, reducing pointless cache
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misses as the build itself won't know this.
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*/
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DrvHashModulo hashDerivationModulo(Store & store, const Derivation & drv, bool maskOutputs)
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{
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/* Return a fixed hash for fixed-output derivations. */
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switch (drv.type()) {
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case DerivationType::CAFixed: {
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std::map<std::string, Hash> outputHashes;
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for (const auto & i : drv.outputs) {
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auto & dof = std::get<DerivationOutputFixed>(i.second.output);
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auto hash = hashString(htSHA256, "fixed:out:"
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+ dof.hash.printMethodAlgo() + ":"
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+ dof.hash.hash.to_string(Base16, false) + ":"
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+ store.printStorePath(i.second.path(store, drv.name)));
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outputHashes.insert_or_assign(i.first, std::move(hash));
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}
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return outputHashes;
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}
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default:
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break;
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}
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/* For other derivations, replace the inputs paths with recursive
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calls to this function. */
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std::map<std::string, StringSet> inputs2;
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for (auto & i : drv.inputDrvs) {
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const auto & res = pathDerivationModulo(store, i.first);
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std::visit(overloaded {
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// Regular non-CA derivation, replace derivation
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[&](Hash drvHash) {
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inputs2.insert_or_assign(drvHash.to_string(Base16, false), i.second);
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},
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// CA derivation's output hashes
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[&](CaOutputHashes outputHashes) {
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std::set<std::string> justOut = { "out" };
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for (auto & output : i.second) {
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/* Put each one in with a single "out" output.. */
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const auto h = outputHashes.at(output);
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inputs2.insert_or_assign(
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h.to_string(Base16, false),
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justOut);
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}
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},
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}, res);
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}
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return hashString(htSHA256, drv.unparse(store, maskOutputs, &inputs2));
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}
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std::string StorePathWithOutputs::to_string(const Store & store) const
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{
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return outputs.empty()
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? store.printStorePath(path)
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: store.printStorePath(path) + "!" + concatStringsSep(",", outputs);
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}
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bool wantOutput(const string & output, const std::set<string> & wanted)
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{
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return wanted.empty() || wanted.find(output) != wanted.end();
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}
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StorePathSet BasicDerivation::outputPaths(const Store & store) const
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{
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StorePathSet paths;
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for (auto & i : outputs)
|
|
paths.insert(i.second.path(store, name));
|
|
return paths;
|
|
}
|
|
|
|
static DerivationOutput readDerivationOutput(Source & in, const Store & store)
|
|
{
|
|
auto path = store.parseStorePath(readString(in));
|
|
auto hashAlgo = readString(in);
|
|
auto hash = readString(in);
|
|
|
|
if (hashAlgo != "") {
|
|
auto method = FileIngestionMethod::Flat;
|
|
if (string(hashAlgo, 0, 2) == "r:") {
|
|
method = FileIngestionMethod::Recursive;
|
|
hashAlgo = string(hashAlgo, 2);
|
|
}
|
|
auto hashType = parseHashType(hashAlgo);
|
|
return hash != ""
|
|
? DerivationOutput {
|
|
.output = DerivationOutputFixed {
|
|
.hash = FixedOutputHash {
|
|
.method = std::move(method),
|
|
.hash = Hash(hash, hashType),
|
|
},
|
|
}
|
|
}
|
|
: DerivationOutput {
|
|
.output = DerivationOutputFloating {
|
|
.method = std::move(method),
|
|
.hashType = std::move(hashType),
|
|
},
|
|
};
|
|
} else
|
|
return DerivationOutput {
|
|
.output = DerivationOutputInputAddressed {
|
|
.path = std::move(path),
|
|
}
|
|
};
|
|
}
|
|
|
|
StringSet BasicDerivation::outputNames() const
|
|
{
|
|
StringSet names;
|
|
for (auto & i : outputs)
|
|
names.insert(i.first);
|
|
return names;
|
|
}
|
|
|
|
|
|
std::string_view BasicDerivation::nameFromPath(const StorePath & drvPath) {
|
|
auto nameWithSuffix = drvPath.name();
|
|
constexpr std::string_view extension = ".drv";
|
|
assert(hasSuffix(nameWithSuffix, extension));
|
|
nameWithSuffix.remove_suffix(extension.size());
|
|
return nameWithSuffix;
|
|
}
|
|
|
|
|
|
Source & readDerivation(Source & in, const Store & store, BasicDerivation & drv, std::string_view name)
|
|
{
|
|
drv.name = name;
|
|
|
|
drv.outputs.clear();
|
|
auto nr = readNum<size_t>(in);
|
|
for (size_t n = 0; n < nr; n++) {
|
|
auto name = readString(in);
|
|
auto output = readDerivationOutput(in, store);
|
|
drv.outputs.emplace(std::move(name), std::move(output));
|
|
}
|
|
|
|
drv.inputSrcs = readStorePaths<StorePathSet>(store, in);
|
|
in >> drv.platform >> drv.builder;
|
|
drv.args = readStrings<Strings>(in);
|
|
|
|
nr = readNum<size_t>(in);
|
|
for (size_t n = 0; n < nr; n++) {
|
|
auto key = readString(in);
|
|
auto value = readString(in);
|
|
drv.env[key] = value;
|
|
}
|
|
|
|
return in;
|
|
}
|
|
|
|
|
|
void writeDerivation(Sink & out, const Store & store, const BasicDerivation & drv)
|
|
{
|
|
out << drv.outputs.size();
|
|
for (auto & i : drv.outputs) {
|
|
out << i.first
|
|
<< store.printStorePath(i.second.path(store, drv.name));
|
|
std::visit(overloaded {
|
|
[&](DerivationOutputInputAddressed doi) {
|
|
out << "" << "";
|
|
},
|
|
[&](DerivationOutputFixed dof) {
|
|
out << dof.hash.printMethodAlgo()
|
|
<< dof.hash.hash.to_string(Base16, false);
|
|
},
|
|
[&](DerivationOutputFloating dof) {
|
|
out << (makeFileIngestionPrefix(dof.method) + printHashType(dof.hashType))
|
|
<< "";
|
|
},
|
|
}, i.second.output);
|
|
}
|
|
writeStorePaths(store, out, drv.inputSrcs);
|
|
out << drv.platform << drv.builder << drv.args;
|
|
out << drv.env.size();
|
|
for (auto & i : drv.env)
|
|
out << i.first << i.second;
|
|
}
|
|
|
|
|
|
std::string hashPlaceholder(const std::string & outputName)
|
|
{
|
|
// FIXME: memoize?
|
|
return "/" + hashString(htSHA256, "nix-output:" + outputName).to_string(Base32, false);
|
|
}
|
|
|
|
|
|
}
|