416 lines
11 KiB
C++
416 lines
11 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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#include "istringstream_nocopy.hh"
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namespace nix {
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void DerivationOutput::parseHashInfo(bool & recursive, Hash & hash) const
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{
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recursive = false;
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string algo = hashAlgo;
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if (string(algo, 0, 2) == "r:") {
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recursive = true;
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algo = string(algo, 2);
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}
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HashType hashType = parseHashType(algo);
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if (hashType == htUnknown)
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throw Error(format("unknown hash algorithm '%1%'") % algo);
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hash = Hash(this->hash, hashType);
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}
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Path BasicDerivation::findOutput(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(format("derivation has no output '%1%'") % id);
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return i->second.path;
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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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Path writeDerivation(ref<Store> store,
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const Derivation & drv, const string & name, RepairFlag repair)
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{
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PathSet references;
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references.insert(drv.inputSrcs.begin(), drv.inputSrcs.end());
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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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string suffix = name + drvExtension;
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string contents = drv.unparse();
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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(format("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(format("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 Derivation parseDerivation(const string & s)
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{
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Derivation drv;
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istringstream_nocopy str(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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DerivationOutput out;
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expect(str, "("); string id = parseString(str);
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expect(str, ","); out.path = parsePath(str);
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expect(str, ","); out.hashAlgo = parseString(str);
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expect(str, ","); out.hash = parseString(str);
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expect(str, ")");
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drv.outputs[id] = out;
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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[drvPath] = parseStrings(str, false);
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expect(str, ")");
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}
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expect(str, ",["); drv.inputSrcs = 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 Path & drvPath)
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{
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try {
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return parseDerivation(readFile(drvPath));
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} catch (FormatError & e) {
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throw Error(format("error parsing derivation '%1%': %2%") % drvPath % e.msg());
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}
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}
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Derivation Store::derivationFromPath(const Path & drvPath)
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{
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assertStorePath(drvPath);
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ensurePath(drvPath);
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auto accessor = getFSAccessor();
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try {
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return parseDerivation(accessor->readFile(drvPath));
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} catch (FormatError & e) {
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throw Error(format("error parsing derivation '%1%': %2%") % drvPath % e.msg());
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}
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}
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static void printString(string & res, const string & s)
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{
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res += '"';
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for (const char * i = s.c_str(); *i; i++)
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if (*i == '\"' || *i == '\\') { res += "\\"; res += *i; }
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else if (*i == '\n') res += "\\n";
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else if (*i == '\r') res += "\\r";
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else if (*i == '\t') res += "\\t";
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else res += *i;
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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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string Derivation::unparse() 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 += '('; printString(s, i.first);
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s += ','; printString(s, i.second.path);
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s += ','; printString(s, i.second.hashAlgo);
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s += ','; printString(s, i.second.hash);
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s += ')';
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}
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s += "],[";
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first = true;
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for (auto & i : inputDrvs) {
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if (first) first = false; else s += ',';
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s += '('; printString(s, i.first);
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s += ','; printStrings(s, i.second.begin(), i.second.end());
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s += ')';
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}
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s += "],";
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printStrings(s, inputSrcs.begin(), inputSrcs.end());
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s += ','; printString(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, 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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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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bool BasicDerivation::isFixedOutput() const
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{
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return outputs.size() == 1 &&
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outputs.begin()->first == "out" &&
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outputs.begin()->second.hash != "";
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}
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DrvHashes drvHashes;
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/* Returns the hash of a derivation modulo fixed-output
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subderivations. A fixed-output derivation is a derivation with one
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output (`out') for which an expected hash and hash algorithm are
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specified (using the `outputHash' and `outputHashAlgo'
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attributes). We don't want changes to such derivations to
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propagate upwards through the dependency graph, changing output
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paths everywhere.
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For instance, if we change the url in a call to the `fetchurl'
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function, we do not want to rebuild everything depending on it
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(after all, (the hash of) the file being downloaded is unchanged).
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So the *output paths* should not change. On the other hand, the
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*derivation paths* should change to reflect the new dependency
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graph.
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That's what this function does: it returns a hash which is just the
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hash of the derivation ATerm, except that any input derivation
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paths have been replaced by the result of a recursive call to this
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function, and that for fixed-output derivations we return a hash of
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its output path. */
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Hash hashDerivationModulo(Store & store, Derivation drv)
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{
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/* Return a fixed hash for fixed-output derivations. */
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if (drv.isFixedOutput()) {
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DerivationOutputs::const_iterator i = drv.outputs.begin();
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return hashString(htSHA256, "fixed:out:"
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+ i->second.hashAlgo + ":"
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+ i->second.hash + ":"
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+ i->second.path);
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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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DerivationInputs inputs2;
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for (auto & i : drv.inputDrvs) {
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Hash h = drvHashes[i.first];
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if (!h) {
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assert(store.isValidPath(i.first));
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Derivation drv2 = readDerivation(store.toRealPath(i.first));
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h = hashDerivationModulo(store, drv2);
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drvHashes[i.first] = h;
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}
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inputs2[h.to_string(Base16, false)] = i.second;
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}
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drv.inputDrvs = inputs2;
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return hashString(htSHA256, drv.unparse());
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}
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DrvPathWithOutputs parseDrvPathWithOutputs(const string & s)
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{
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size_t n = s.find("!");
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return n == s.npos
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? DrvPathWithOutputs(s, std::set<string>())
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: DrvPathWithOutputs(string(s, 0, n), tokenizeString<std::set<string> >(string(s, n + 1), ","));
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}
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Path makeDrvPathWithOutputs(const Path & drvPath, const std::set<string> & outputs)
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{
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return outputs.empty()
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? drvPath
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: drvPath + "!" + 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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PathSet BasicDerivation::outputPaths() const
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{
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PathSet paths;
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for (auto & i : outputs)
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paths.insert(i.second.path);
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return paths;
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}
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Source & readDerivation(Source & in, Store & store, BasicDerivation & drv)
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{
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drv.outputs.clear();
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auto nr = readNum<size_t>(in);
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for (size_t n = 0; n < nr; n++) {
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auto name = readString(in);
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DerivationOutput o;
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in >> o.path >> o.hashAlgo >> o.hash;
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store.assertStorePath(o.path);
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drv.outputs[name] = o;
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}
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drv.inputSrcs = readStorePaths<PathSet>(store, in);
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in >> drv.platform >> drv.builder;
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drv.args = readStrings<Strings>(in);
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nr = readNum<size_t>(in);
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for (size_t n = 0; n < nr; n++) {
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auto key = readString(in);
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auto value = readString(in);
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drv.env[key] = value;
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}
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return in;
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}
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Sink & operator << (Sink & out, const BasicDerivation & drv)
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{
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out << drv.outputs.size();
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for (auto & i : drv.outputs)
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out << i.first << i.second.path << i.second.hashAlgo << i.second.hash;
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out << drv.inputSrcs << drv.platform << drv.builder << drv.args;
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out << drv.env.size();
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for (auto & i : drv.env)
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out << i.first << i.second;
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return out;
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}
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std::string hashPlaceholder(const std::string & outputName)
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{
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// FIXME: memoize?
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return "/" + hashString(htSHA256, "nix-output:" + outputName).to_string(Base32, false);
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}
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}
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