forked from lix-project/lix
413 lines
13 KiB
C++
413 lines
13 KiB
C++
#include "get-drvs.hh"
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#include "util.hh"
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#include "eval-inline.hh"
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#include "derivations.hh"
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#include "store-api.hh"
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#include "path-with-outputs.hh"
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#include <cstring>
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#include <regex>
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namespace nix {
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DrvInfo::DrvInfo(EvalState & state, std::string attrPath, Bindings * attrs)
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: state(&state), attrs(attrs), attrPath(std::move(attrPath))
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{
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}
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DrvInfo::DrvInfo(EvalState & state, ref<Store> store, const std::string & drvPathWithOutputs)
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: state(&state), attrs(nullptr), attrPath("")
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{
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auto [drvPath, selectedOutputs] = parsePathWithOutputs(*store, drvPathWithOutputs);
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this->drvPath = drvPath;
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auto drv = store->derivationFromPath(drvPath);
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name = drvPath.name();
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if (selectedOutputs.size() > 1)
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throw Error("building more than one derivation output is not supported, in '%s'", drvPathWithOutputs);
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outputName =
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selectedOutputs.empty()
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? getOr(drv.env, "outputName", "out")
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: *selectedOutputs.begin();
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auto i = drv.outputs.find(outputName);
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if (i == drv.outputs.end())
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throw Error("derivation '%s' does not have output '%s'", store->printStorePath(drvPath), outputName);
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auto & [outputName, output] = *i;
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outPath = {output.path(*store, drv.name, outputName)};
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}
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std::string DrvInfo::queryName() const
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{
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if (name == "" && attrs) {
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auto i = attrs->find(state->sName);
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if (i == attrs->end()) throw TypeError("derivation name missing");
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name = state->forceStringNoCtx(*i->value, noPos, "while evaluating the 'name' attribute of a derivation");
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}
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return name;
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}
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std::string DrvInfo::querySystem() const
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{
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if (system == "" && attrs) {
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auto i = attrs->find(state->sSystem);
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system = i == attrs->end() ? "unknown" : state->forceStringNoCtx(*i->value, i->pos, "while evaluating the 'system' attribute of a derivation");
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}
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return system;
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}
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std::optional<StorePath> DrvInfo::queryDrvPath() const
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{
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if (!drvPath && attrs) {
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Bindings::iterator i = attrs->find(state->sDrvPath);
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PathSet context;
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if (i == attrs->end())
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drvPath = {std::nullopt};
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else
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drvPath = {state->coerceToStorePath(i->pos, *i->value, context, "while evaluating the 'drvPath' attribute of a derivation")};
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}
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return drvPath.value_or(std::nullopt);
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}
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StorePath DrvInfo::requireDrvPath() const
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{
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if (auto drvPath = queryDrvPath())
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return *drvPath;
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throw Error("derivation does not contain a 'drvPath' attribute");
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}
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StorePath DrvInfo::queryOutPath() const
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{
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if (!outPath && attrs) {
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Bindings::iterator i = attrs->find(state->sOutPath);
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PathSet context;
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if (i != attrs->end())
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outPath = state->coerceToStorePath(i->pos, *i->value, context, "while evaluating the output path of a derivation");
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}
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if (!outPath)
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throw UnimplementedError("CA derivations are not yet supported");
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return *outPath;
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}
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DrvInfo::Outputs DrvInfo::queryOutputs(bool withPaths, bool onlyOutputsToInstall)
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{
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if (outputs.empty()) {
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/* Get the ‘outputs’ list. */
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Bindings::iterator i;
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if (attrs && (i = attrs->find(state->sOutputs)) != attrs->end()) {
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state->forceList(*i->value, i->pos, "while evaluating the 'outputs' attribute of a derivation");
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/* For each output... */
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for (auto elem : i->value->listItems()) {
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std::string output(state->forceStringNoCtx(*elem, i->pos, "while evaluating the name of an output of a derivation"));
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if (withPaths) {
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/* Evaluate the corresponding set. */
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Bindings::iterator out = attrs->find(state->symbols.create(output));
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if (out == attrs->end()) continue; // FIXME: throw error?
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state->forceAttrs(*out->value, i->pos, "while evaluating an output of a derivation");
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/* And evaluate its ‘outPath’ attribute. */
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Bindings::iterator outPath = out->value->attrs->find(state->sOutPath);
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if (outPath == out->value->attrs->end()) continue; // FIXME: throw error?
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PathSet context;
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outputs.emplace(output, state->coerceToStorePath(outPath->pos, *outPath->value, context, "while evaluating an output path of a derivation"));
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} else
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outputs.emplace(output, std::nullopt);
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}
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} else
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outputs.emplace("out", withPaths ? std::optional{queryOutPath()} : std::nullopt);
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}
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if (!onlyOutputsToInstall || !attrs)
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return outputs;
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Bindings::iterator i;
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if (attrs && (i = attrs->find(state->sOutputSpecified)) != attrs->end() && state->forceBool(*i->value, i->pos, "while evaluating the 'outputSpecified' attribute of a derivation")) {
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Outputs result;
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auto out = outputs.find(queryOutputName());
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if (out == outputs.end())
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throw Error("derivation does not have output '%s'", queryOutputName());
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result.insert(*out);
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return result;
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}
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else {
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/* Check for `meta.outputsToInstall` and return `outputs` reduced to that. */
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const Value * outTI = queryMeta("outputsToInstall");
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if (!outTI) return outputs;
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auto errMsg = Error("this derivation has bad 'meta.outputsToInstall'");
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/* ^ this shows during `nix-env -i` right under the bad derivation */
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if (!outTI->isList()) throw errMsg;
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Outputs result;
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for (auto elem : outTI->listItems()) {
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if (elem->type() != nString) throw errMsg;
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auto out = outputs.find(elem->string.s);
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if (out == outputs.end()) throw errMsg;
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result.insert(*out);
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}
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return result;
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}
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}
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std::string DrvInfo::queryOutputName() const
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{
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if (outputName == "" && attrs) {
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Bindings::iterator i = attrs->find(state->sOutputName);
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outputName = i != attrs->end() ? state->forceStringNoCtx(*i->value, noPos, "while evaluating the output name of a derivation") : "";
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}
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return outputName;
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}
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Bindings * DrvInfo::getMeta()
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{
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if (meta) return meta;
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if (!attrs) return 0;
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Bindings::iterator a = attrs->find(state->sMeta);
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if (a == attrs->end()) return 0;
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state->forceAttrs(*a->value, a->pos, "while evaluating the 'meta' attribute of a derivation");
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meta = a->value->attrs;
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return meta;
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}
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StringSet DrvInfo::queryMetaNames()
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{
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StringSet res;
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if (!getMeta()) return res;
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for (auto & i : *meta)
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res.emplace(state->symbols[i.name]);
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return res;
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}
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bool DrvInfo::checkMeta(Value & v)
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{
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state->forceValue(v, [&]() { return v.determinePos(noPos); });
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if (v.type() == nList) {
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for (auto elem : v.listItems())
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if (!checkMeta(*elem)) return false;
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return true;
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}
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else if (v.type() == nAttrs) {
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Bindings::iterator i = v.attrs->find(state->sOutPath);
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if (i != v.attrs->end()) return false;
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for (auto & i : *v.attrs)
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if (!checkMeta(*i.value)) return false;
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return true;
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}
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else return v.type() == nInt || v.type() == nBool || v.type() == nString ||
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v.type() == nFloat;
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}
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Value * DrvInfo::queryMeta(const std::string & name)
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{
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if (!getMeta()) return 0;
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Bindings::iterator a = meta->find(state->symbols.create(name));
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if (a == meta->end() || !checkMeta(*a->value)) return 0;
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return a->value;
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}
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std::string DrvInfo::queryMetaString(const std::string & name)
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{
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Value * v = queryMeta(name);
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if (!v || v->type() != nString) return "";
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return v->string.s;
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}
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NixInt DrvInfo::queryMetaInt(const std::string & name, NixInt def)
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{
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Value * v = queryMeta(name);
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if (!v) return def;
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if (v->type() == nInt) return v->integer;
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if (v->type() == nString) {
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/* Backwards compatibility with before we had support for
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integer meta fields. */
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if (auto n = string2Int<NixInt>(v->string.s))
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return *n;
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}
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return def;
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}
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NixFloat DrvInfo::queryMetaFloat(const std::string & name, NixFloat def)
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{
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Value * v = queryMeta(name);
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if (!v) return def;
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if (v->type() == nFloat) return v->fpoint;
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if (v->type() == nString) {
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/* Backwards compatibility with before we had support for
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float meta fields. */
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if (auto n = string2Float<NixFloat>(v->string.s))
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return *n;
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}
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return def;
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}
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bool DrvInfo::queryMetaBool(const std::string & name, bool def)
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{
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Value * v = queryMeta(name);
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if (!v) return def;
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if (v->type() == nBool) return v->boolean;
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if (v->type() == nString) {
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/* Backwards compatibility with before we had support for
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Boolean meta fields. */
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if (strcmp(v->string.s, "true") == 0) return true;
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if (strcmp(v->string.s, "false") == 0) return false;
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}
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return def;
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}
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void DrvInfo::setMeta(const std::string & name, Value * v)
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{
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getMeta();
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auto attrs = state->buildBindings(1 + (meta ? meta->size() : 0));
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auto sym = state->symbols.create(name);
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if (meta)
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for (auto i : *meta)
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if (i.name != sym)
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attrs.insert(i);
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if (v) attrs.insert(sym, v);
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meta = attrs.finish();
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}
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/* Cache for already considered attrsets. */
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typedef std::set<Bindings *> Done;
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/* Evaluate value `v'. If it evaluates to a set of type `derivation',
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then put information about it in `drvs' (unless it's already in `done').
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The result boolean indicates whether it makes sense
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for the caller to recursively search for derivations in `v'. */
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static bool getDerivation(EvalState & state, Value & v,
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const std::string & attrPath, DrvInfos & drvs, Done & done,
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bool ignoreAssertionFailures)
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{
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try {
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state.forceValue(v, [&]() { return v.determinePos(noPos); });
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if (!state.isDerivation(v)) return true;
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/* Remove spurious duplicates (e.g., a set like `rec { x =
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derivation {...}; y = x;}'. */
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if (!done.insert(v.attrs).second) return false;
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DrvInfo drv(state, attrPath, v.attrs);
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drv.queryName();
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drvs.push_back(drv);
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return false;
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} catch (AssertionError & e) {
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if (ignoreAssertionFailures) return false;
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throw;
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}
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}
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std::optional<DrvInfo> getDerivation(EvalState & state, Value & v,
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bool ignoreAssertionFailures)
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{
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Done done;
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DrvInfos drvs;
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getDerivation(state, v, "", drvs, done, ignoreAssertionFailures);
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if (drvs.size() != 1) return {};
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return std::move(drvs.front());
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}
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static std::string addToPath(const std::string & s1, const std::string & s2)
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{
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return s1.empty() ? s2 : s1 + "." + s2;
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}
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static std::regex attrRegex("[A-Za-z_][A-Za-z0-9-_+]*");
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static void getDerivations(EvalState & state, Value & vIn,
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const std::string & pathPrefix, Bindings & autoArgs,
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DrvInfos & drvs, Done & done,
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bool ignoreAssertionFailures)
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{
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Value v;
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state.autoCallFunction(autoArgs, vIn, v);
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/* Process the expression. */
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if (!getDerivation(state, v, pathPrefix, drvs, done, ignoreAssertionFailures)) ;
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else if (v.type() == nAttrs) {
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/* !!! undocumented hackery to support combining channels in
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nix-env.cc. */
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bool combineChannels = v.attrs->find(state.symbols.create("_combineChannels")) != v.attrs->end();
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/* Consider the attributes in sorted order to get more
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deterministic behaviour in nix-env operations (e.g. when
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there are names clashes between derivations, the derivation
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bound to the attribute with the "lower" name should take
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precedence). */
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for (auto & i : v.attrs->lexicographicOrder(state.symbols)) {
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debug("evaluating attribute '%1%'", state.symbols[i->name]);
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if (!std::regex_match(std::string(state.symbols[i->name]), attrRegex))
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continue;
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std::string pathPrefix2 = addToPath(pathPrefix, state.symbols[i->name]);
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if (combineChannels)
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getDerivations(state, *i->value, pathPrefix2, autoArgs, drvs, done, ignoreAssertionFailures);
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else if (getDerivation(state, *i->value, pathPrefix2, drvs, done, ignoreAssertionFailures)) {
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/* If the value of this attribute is itself a set,
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should we recurse into it? => Only if it has a
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`recurseForDerivations = true' attribute. */
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if (i->value->type() == nAttrs) {
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Bindings::iterator j = i->value->attrs->find(state.sRecurseForDerivations);
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if (j != i->value->attrs->end() && state.forceBool(*j->value, j->pos, "while evaluating the attribute `recurseForDerivations`"))
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getDerivations(state, *i->value, pathPrefix2, autoArgs, drvs, done, ignoreAssertionFailures);
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}
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}
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}
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}
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else if (v.type() == nList) {
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for (auto [n, elem] : enumerate(v.listItems())) {
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std::string pathPrefix2 = addToPath(pathPrefix, fmt("%d", n));
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if (getDerivation(state, *elem, pathPrefix2, drvs, done, ignoreAssertionFailures))
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getDerivations(state, *elem, pathPrefix2, autoArgs, drvs, done, ignoreAssertionFailures);
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}
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}
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else throw TypeError("expression does not evaluate to a derivation (or a set or list of those)");
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}
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void getDerivations(EvalState & state, Value & v, const std::string & pathPrefix,
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Bindings & autoArgs, DrvInfos & drvs, bool ignoreAssertionFailures)
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{
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Done done;
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getDerivations(state, v, pathPrefix, autoArgs, drvs, done, ignoreAssertionFailures);
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}
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}
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