forked from lix-project/lix
318 lines
9.7 KiB
C++
318 lines
9.7 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 <cstring>
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namespace nix {
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string DrvInfo::queryDrvPath()
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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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drvPath = i != attrs->end() ? state->coerceToPath(*i->pos, *i->value, context) : "";
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}
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return drvPath;
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}
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string DrvInfo::queryOutPath()
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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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outPath = i != attrs->end() ? state->coerceToPath(*i->pos, *i->value, context) : "";
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}
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return outPath;
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}
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DrvInfo::Outputs DrvInfo::queryOutputs()
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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);
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/* For each output... */
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for (unsigned int j = 0; j < i->value->listSize(); ++j) {
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/* Evaluate the corresponding set. */
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string name = state->forceStringNoCtx(*i->value->listElems()[j], *i->pos);
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Bindings::iterator out = attrs->find(state->symbols.create(name));
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if (out == attrs->end()) continue; // FIXME: throw error?
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state->forceAttrs(*out->value);
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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[name] = state->coerceToPath(*outPath->pos, *outPath->value, context);
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}
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} else
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outputs["out"] = queryOutPath();
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}
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return outputs;
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}
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string DrvInfo::queryOutputName()
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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) : "";
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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);
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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.insert(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);
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if (v.isList()) {
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for (unsigned int n = 0; n < v.listSize(); ++n)
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if (!checkMeta(*v.listElems()[n])) return false;
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return true;
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}
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else if (v.type == tAttrs) {
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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 == tInt || v.type == tBool || v.type == tString ||
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v.type == tFloat;
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}
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Value * DrvInfo::queryMeta(const 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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string DrvInfo::queryMetaString(const string & name)
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{
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Value * v = queryMeta(name);
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if (!v || v->type != tString) return "";
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return v->string.s;
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}
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NixInt DrvInfo::queryMetaInt(const 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 == tInt) return v->integer;
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if (v->type == tString) {
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/* Backwards compatibility with before we had support for
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integer meta fields. */
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NixInt n;
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if (string2Int(v->string.s, n)) return n;
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}
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return def;
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}
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NixFloat DrvInfo::queryMetaFloat(const 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 == tFloat) return v->fpoint;
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if (v->type == tString) {
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/* Backwards compatibility with before we had support for
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float meta fields. */
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NixFloat n;
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if (string2Float(v->string.s, n)) return n;
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}
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return def;
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}
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bool DrvInfo::queryMetaBool(const 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 == tBool) return v->boolean;
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if (v->type == tString) {
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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 string & name, Value * v)
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{
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getMeta();
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Bindings * old = meta;
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meta = state->allocBindings(1 + (old ? old->size() : 0));
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Symbol sym = state->symbols.create(name);
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if (old)
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for (auto i : *old)
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if (i.name != sym)
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meta->push_back(i);
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if (v) meta->push_back(Attr(sym, v));
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meta->sort();
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}
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/* Cache for already considered attrsets. */
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typedef 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
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`doneExprs'). 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 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);
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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.find(v.attrs) != done.end()) return false;
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done.insert(v.attrs);
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Bindings::iterator i = v.attrs->find(state.sName);
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/* !!! We really would like to have a decent back trace here. */
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if (i == v.attrs->end()) throw TypeError("derivation name missing");
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Bindings::iterator i2 = v.attrs->find(state.sSystem);
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DrvInfo drv(state, state.forceStringNoCtx(*i->value), attrPath,
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i2 == v.attrs->end() ? "unknown" : state.forceStringNoCtx(*i2->value, *i2->pos),
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v.attrs);
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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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bool getDerivation(EvalState & state, Value & v, DrvInfo & drv,
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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 false;
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drv = drvs.front();
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return true;
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}
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static string addToPath(const string & s1, const 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 void getDerivations(EvalState & state, Value & vIn,
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const 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 == tAttrs) {
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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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typedef std::map<string, Symbol> SortedSymbols;
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SortedSymbols attrs;
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for (auto & i : *v.attrs)
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attrs.insert(std::pair<string, Symbol>(i.name, i.name));
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for (auto & i : attrs) {
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startNest(nest, lvlDebug, format("evaluating attribute ‘%1%’") % i.first);
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string pathPrefix2 = addToPath(pathPrefix, i.first);
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Value & v2(*v.attrs->find(i.second)->value);
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if (combineChannels)
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getDerivations(state, v2, pathPrefix2, autoArgs, drvs, done, ignoreAssertionFailures);
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else if (getDerivation(state, v2, 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 (v2.type == tAttrs) {
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Bindings::iterator j = v2.attrs->find(state.symbols.create("recurseForDerivations"));
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if (j != v2.attrs->end() && state.forceBool(*j->value))
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getDerivations(state, v2, 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.isList()) {
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for (unsigned int n = 0; n < v.listSize(); ++n) {
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startNest(nest, lvlDebug,
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format("evaluating list element"));
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string pathPrefix2 = addToPath(pathPrefix, (format("%1%") % n).str());
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if (getDerivation(state, *v.listElems()[n], pathPrefix2, drvs, done, ignoreAssertionFailures))
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getDerivations(state, *v.listElems()[n], 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 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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