diff options
Diffstat (limited to 'src/libexpr/primops.cc')
| -rw-r--r-- | src/libexpr/primops.cc | 129 |
1 files changed, 84 insertions, 45 deletions
diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc index 3e955ea3fe09..e58f9265f02a 100644 --- a/src/libexpr/primops.cc +++ b/src/libexpr/primops.cc @@ -337,6 +337,9 @@ static void prim_derivationStrict(EvalState & state, Value * * args, Value & v) string outputHash, outputHashAlgo; bool outputHashRecursive = false; + StringSet outputs; + outputs.insert("out"); + foreach (Bindings::iterator, i, *args[0]->attrs) { string key = i->name; startNest(nest, lvlVomit, format("processing attribute `%1%'") % key); @@ -368,6 +371,24 @@ static void prim_derivationStrict(EvalState & state, Value * * args, Value & v) else if (s == "flat") outputHashRecursive = false; else throw EvalError(format("invalid value `%1%' for `outputHashMode' attribute") % s); } + else if (key == "outputs") { + Strings tmp = tokenizeString(s); + outputs.clear(); + foreach (Strings::iterator, j, tmp) { + if (outputs.find(*j) != outputs.end()) + throw EvalError(format("duplicate derivation output `%1%'") % *j); + /* !!! Check whether *j is a valid attribute + name. */ + /* Derivations cannot be named ‘drv’, because + then we'd have an attribute ‘drvPath’ in + the resulting set. */ + if (*j == "drv") + throw EvalError(format("invalid derivation output name `drv'") % *j); + outputs.insert(*j); + } + if (outputs.empty()) + throw EvalError("derivation cannot have an empty set of outputs"); + } } } catch (Error & e) { @@ -424,54 +445,68 @@ static void prim_derivationStrict(EvalState & state, Value * * args, Value & v) if (drv.platform == "") throw EvalError("required attribute `system' missing"); - /* If an output hash was given, check it. */ - Path outPath; - if (outputHash == "") - outputHashAlgo = ""; - else { - HashType ht = parseHashType(outputHashAlgo); - if (ht == htUnknown) - throw EvalError(format("unknown hash algorithm `%1%'") % outputHashAlgo); - Hash h(ht); - if (outputHash.size() == h.hashSize * 2) - /* hexadecimal representation */ - h = parseHash(ht, outputHash); - else if (outputHash.size() == hashLength32(h)) - /* base-32 representation */ - h = parseHash32(ht, outputHash); - else - throw Error(format("hash `%1%' has wrong length for hash type `%2%'") - % outputHash % outputHashAlgo); - string s = outputHash; - outputHash = printHash(h); - outPath = makeFixedOutputPath(outputHashRecursive, ht, h, drvName); - if (outputHashRecursive) outputHashAlgo = "r:" + outputHashAlgo; - } - /* Check whether the derivation name is valid. */ checkStoreName(drvName); if (isDerivation(drvName)) throw EvalError(format("derivation names are not allowed to end in `%1%'") % drvExtension); - /* Construct the "masked" derivation store expression, which is - the final one except that in the list of outputs, the output - paths are empty, and the corresponding environment variables - have an empty value. This ensures that changes in the set of - output names do get reflected in the hash. */ - drv.env["out"] = ""; - drv.outputs["out"] = DerivationOutput("", outputHashAlgo, outputHash); - - /* Use the masked derivation expression to compute the output - path. */ - if (outPath == "") - outPath = makeStorePath("output:out", hashDerivationModulo(state, drv), drvName); - - /* Construct the final derivation store expression. */ - drv.env["out"] = outPath; - drv.outputs["out"] = - DerivationOutput(outPath, outputHashAlgo, outputHash); + /* Construct the "masked" store derivation, which is the final one + except that in the list of outputs, the output paths are empty, + and the corresponding environment variables have an empty + value. This ensures that changes in the set of output names do + get reflected in the hash. + + However, for fixed-output derivations, we can compute the + output path directly, so we don't need this. */ + bool fixedOnly = true; + foreach (StringSet::iterator, i, outputs) { + if (*i != "out" || outputHash == "") { + drv.env[*i] = ""; + drv.outputs[*i] = DerivationOutput("", "", ""); + fixedOnly = false; + } else { + /* If an output hash was given, check it, and compute the + output path. */ + HashType ht = parseHashType(outputHashAlgo); + if (ht == htUnknown) + throw EvalError(format("unknown hash algorithm `%1%'") % outputHashAlgo); + Hash h(ht); + if (outputHash.size() == h.hashSize * 2) + /* hexadecimal representation */ + h = parseHash(ht, outputHash); + else if (outputHash.size() == hashLength32(h)) + /* base-32 representation */ + h = parseHash32(ht, outputHash); + else + throw Error(format("hash `%1%' has wrong length for hash type `%2%'") + % outputHash % outputHashAlgo); + string s = outputHash; + outputHash = printHash(h); + if (outputHashRecursive) outputHashAlgo = "r:" + outputHashAlgo; + Path outPath = makeFixedOutputPath(outputHashRecursive, ht, h, drvName); + drv.env[*i] = outPath; + drv.outputs[*i] = DerivationOutput(outPath, outputHashAlgo, outputHash); + } + } + /* Use the masked derivation expression to compute the output + path. !!! Isn't it a potential security problem that the name + of each output path (including the suffix) isn't taken into + account? For instance, changing the suffix for one path + (‘i->first == "out" ...’) doesn't affect the hash of the + others. Is that exploitable? */ + if (!fixedOnly) { + Hash h = hashDerivationModulo(state, drv); + foreach (DerivationOutputs::iterator, i, drv.outputs) + if (i->second.path == "") { + Path outPath = makeStorePath("output:" + i->first, h, + drvName + (i->first == "out" ? "" : "-" + i->first)); + drv.env[i->first] = outPath; + i->second.path = outPath; + } + } + /* Write the resulting term into the Nix store directory. */ Path drvPath = writeDerivation(drv, drvName); @@ -479,14 +514,18 @@ static void prim_derivationStrict(EvalState & state, Value * * args, Value & v) % drvName % drvPath); /* Optimisation, but required in read-only mode! because in that - case we don't actually write store expressions, so we can't + case we don't actually write store derivations, so we can't read them later. */ state.drvHashes[drvPath] = hashDerivationModulo(state, drv); - /* !!! assumes a single output */ - state.mkAttrs(v, 2); - mkString(*state.allocAttr(v, state.sOutPath), outPath, singleton<PathSet>(drvPath)); + state.mkAttrs(v, 1 + drv.outputs.size()); mkString(*state.allocAttr(v, state.sDrvPath), drvPath, singleton<PathSet>("=" + drvPath)); + foreach (DerivationOutputs::iterator, i, drv.outputs) { + /* The output path of an output X is ‘<X>Path’, + e.g. ‘outPath’. */ + mkString(*state.allocAttr(v, state.symbols.create(i->first + "Path")), + i->second.path, singleton<PathSet>(drvPath)); + } v.attrs->sort(); } |