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https://github.com/NixOS/nix
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* Implemented derivations.
This commit is contained in:
Eelco Dolstra
parent
5187678913
commit
3d94be61ea
6 changed files with 183 additions and 192 deletions
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@ -207,6 +207,7 @@ static void prim_trace(EvalState & state, Value * * args, Value & v)
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printMsg(lvlError, format("trace: %1%") % e);
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return evalExpr(state, args[1]);
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}
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#endif
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/*************************************************************
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@ -282,24 +283,21 @@ static void prim_derivationStrict(EvalState & state, Value * * args, Value & v)
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{
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startNest(nest, lvlVomit, "evaluating derivation");
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ATermMap attrs;
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queryAllAttrs(evalExpr(state, args[0]), attrs, true);
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state.forceAttrs(*args[0]);
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/* Figure out the name already (for stack backtraces). */
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ATerm posDrvName;
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Expr eDrvName = attrs.get(toATerm("name"));
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if (!eDrvName)
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/* Figure out the name first (for stack backtraces). */
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Bindings::iterator attr = args[0]->attrs->find(toATerm("name"));
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if (attr == args[0]->attrs->end())
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throw EvalError("required attribute `name' missing");
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if (!matchAttrRHS(eDrvName, eDrvName, posDrvName)) abort();
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string drvName;
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try {
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drvName = evalStringNoCtx(state, eDrvName);
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drvName = state.forceStringNoCtx(attr->second);
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} catch (Error & e) {
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e.addPrefix(format("while evaluating the derivation attribute `name' at %1%:\n")
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% showPos(posDrvName));
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e.addPrefix(format("while evaluating the derivation attribute `name' at <SOMEWHERE>:\n"));
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// !!! % showPos(posDrvName));
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throw;
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}
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/* Build the derivation expression by processing the attributes. */
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Derivation drv;
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@ -308,12 +306,8 @@ static void prim_derivationStrict(EvalState & state, Value * * args, Value & v)
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string outputHash, outputHashAlgo;
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bool outputHashRecursive = false;
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for (ATermMap::const_iterator i = attrs.begin(); i != attrs.end(); ++i) {
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string key = aterm2String(i->key);
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ATerm value;
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Expr pos;
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ATerm rhs = i->value;
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if (!matchAttrRHS(rhs, value, pos)) abort();
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foreach (Bindings::iterator, i, *args[0]->attrs) {
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string key = aterm2String(i->first);
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startNest(nest, lvlVomit, format("processing attribute `%1%'") % key);
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try {
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@ -321,15 +315,9 @@ static void prim_derivationStrict(EvalState & state, Value * * args, Value & v)
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/* The `args' attribute is special: it supplies the
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command-line arguments to the builder. */
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if (key == "args") {
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ATermList es;
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value = evalExpr(state, value);
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if (!matchList(value, es)) {
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static bool haveWarned = false;
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warnOnce(haveWarned, "the `args' attribute should evaluate to a list");
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es = flattenList(state, value);
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}
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for (ATermIterator i(es); i; ++i) {
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string s = coerceToString(state, *i, context, true);
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state.forceList(i->second);
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for (unsigned int n = 0; n < i->second.list.length; ++n) {
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string s = state.coerceToString(i->second.list.elems[n], context, true);
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drv.args.push_back(s);
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}
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}
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@ -337,7 +325,7 @@ static void prim_derivationStrict(EvalState & state, Value * * args, Value & v)
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/* All other attributes are passed to the builder through
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the environment. */
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else {
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string s = coerceToString(state, value, context, true);
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string s = state.coerceToString(i->second, context, true);
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drv.env[key] = s;
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if (key == "builder") drv.builder = s;
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else if (key == "system") drv.platform = s;
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@ -352,13 +340,12 @@ static void prim_derivationStrict(EvalState & state, Value * * args, Value & v)
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}
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} catch (Error & e) {
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e.addPrefix(format("while evaluating the derivation attribute `%1%' at %2%:\n")
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% key % showPos(pos));
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e.addPrefix(format("while instantiating the derivation named `%1%' at %2%:\n")
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% drvName % showPos(posDrvName));
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e.addPrefix(format("while evaluating the derivation attribute `%1%' at <SOMEWHERE>:\n")
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% key /* !!! % showPos(pos) */);
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e.addPrefix(format("while instantiating the derivation named `%1%' at <SOMEWHERE>:\n")
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% drvName /* !!! % showPos(posDrvName) */);
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throw;
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}
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}
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/* Everything in the context of the strings in the derivation
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@ -466,25 +453,25 @@ static void prim_derivationStrict(EvalState & state, Value * * args, Value & v)
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state.drvHashes[drvPath] = hashDerivationModulo(state, drv);
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/* !!! assumes a single output */
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ATermMap outAttrs(2);
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outAttrs.set(toATerm("outPath"),
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makeAttrRHS(makeStr(outPath, singleton<PathSet>(drvPath)), makeNoPos()));
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outAttrs.set(toATerm("drvPath"),
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makeAttrRHS(makeStr(drvPath, singleton<PathSet>("=" + drvPath)), makeNoPos()));
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return makeAttrs(outAttrs);
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//state.mkAttrs(v);
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state.cloneAttrs(*args[0], v);
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mkString((*v.attrs)[toATerm("outPath")], outPath, singleton<PathSet>(drvPath));
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mkString((*v.attrs)[toATerm("drvPath")], drvPath, singleton<PathSet>("=" + drvPath));
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mkString((*v.attrs)[toATerm("type")], "derivation"); // !!! remove
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}
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static void prim_derivationLazy(EvalState & state, Value * * args, Value & v)
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{
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Expr eAttrs = evalExpr(state, args[0]);
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ATermMap attrs;
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queryAllAttrs(eAttrs, attrs, true);
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state.forceAttrs(*args[0]);
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attrs.set(toATerm("type"),
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makeAttrRHS(makeStr("derivation"), makeNoPos()));
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state.cloneAttrs(*args[0], v);
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mkString((*v.attrs)[toATerm("type")], "derivation");
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/* !!! */
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#if 0
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Expr drvStrict = makeCall(makeVar(toATerm("derivation!")), eAttrs);
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attrs.set(toATerm("outPath"),
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@ -493,8 +480,8 @@ static void prim_derivationLazy(EvalState & state, Value * * args, Value & v)
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makeAttrRHS(makeSelect(drvStrict, toATerm("drvPath")), makeNoPos()));
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return makeAttrs(attrs);
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}
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#endif
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}
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/*************************************************************
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@ -592,6 +579,7 @@ static void prim_toXML(EvalState & state, Value * * args, Value & v)
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printTermAsXML(strictEvalExpr(state, args[0]), out, context);
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return makeStr(out.str(), context);
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}
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#endif
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/* Store a string in the Nix store as a source file that can be used
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@ -599,12 +587,12 @@ static void prim_toXML(EvalState & state, Value * * args, Value & v)
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static void prim_toFile(EvalState & state, Value * * args, Value & v)
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{
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PathSet context;
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string name = evalStringNoCtx(state, args[0]);
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string contents = evalString(state, args[1], context);
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string name = state.forceStringNoCtx(*args[0]);
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string contents = state.forceString(*args[1]); // !!! context
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PathSet refs;
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for (PathSet::iterator i = context.begin(); i != context.end(); ++i) {
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foreach (PathSet::iterator, i, context) {
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Path path = *i;
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if (path.at(0) == '=') path = string(path, 1);
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if (isDerivation(path))
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@ -619,11 +607,12 @@ static void prim_toFile(EvalState & state, Value * * args, Value & v)
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/* Note: we don't need to add `context' to the context of the
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result, since `storePath' itself has references to the paths
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used in args[1]. */
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return makeStr(storePath, singleton<PathSet>(storePath));
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mkString(v, storePath, singleton<PathSet>(storePath));
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}
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#if 0
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struct FilterFromExpr : PathFilter
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{
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EvalState & state;
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@ -731,10 +720,7 @@ static void prim_removeAttrs(EvalState & state, Value * * args, Value & v)
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state.forceAttrs(*args[0]);
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state.forceList(*args[1]);
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state.mkAttrs(v);
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foreach (Bindings::iterator, i, *args[0]->attrs)
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(*v.attrs)[i->first] = i->second;
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state.cloneAttrs(*args[0], v);
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for (unsigned int i = 0; i < args[1]->list.length; ++i) {
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state.forceStringNoCtx(args[1]->list.elems[i]);
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@ -743,40 +729,32 @@ static void prim_removeAttrs(EvalState & state, Value * * args, Value & v)
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}
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#if 0
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/* Builds an attribute set from a list specifying (name, value)
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pairs. To be precise, a list [{name = "name1"; value = value1;}
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... {name = "nameN"; value = valueN;}] is transformed to {name1 =
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value1; ... nameN = valueN;}. */
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static void prim_listToAttrs(EvalState & state, Value * * args, Value & v)
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{
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try {
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ATermMap res = ATermMap();
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ATermList list;
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list = evalList(state, args[0]);
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for (ATermIterator i(list); i; ++i){
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// *i should now contain a pointer to the list item expression
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ATermList attrs;
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Expr evaledExpr = evalExpr(state, *i);
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if (matchAttrs(evaledExpr, attrs)){
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Expr e = evalExpr(state, makeSelect(evaledExpr, toATerm("name")));
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string attr = evalStringNoCtx(state,e);
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Expr r = makeSelect(evaledExpr, toATerm("value"));
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res.set(toATerm(attr), makeAttrRHS(r, makeNoPos()));
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}
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else
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throw TypeError(format("list element in `listToAttrs' is %s, expected a set { name = \"<name>\"; value = <value>; }")
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% showType(evaledExpr));
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}
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return makeAttrs(res);
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} catch (Error & e) {
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e.addPrefix(format("in `listToAttrs':\n"));
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throw;
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state.forceList(*args[0]);
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state.mkAttrs(v);
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for (unsigned int i = 0; i < args[0]->list.length; ++i) {
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Value & v2(args[0]->list.elems[i]);
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state.forceAttrs(v2);
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Bindings::iterator j = v2.attrs->find(toATerm("name"));
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if (j == v2.attrs->end())
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throw TypeError("`name' attribute missing in a call to `listToAttrs'");
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string name = state.forceStringNoCtx(j->second);
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j = v2.attrs->find(toATerm("value"));
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if (j == v2.attrs->end())
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throw TypeError("`value' attribute missing in a call to `listToAttrs'");
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(*v.attrs)[toATerm(name)] = j->second; // !!! sharing?
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}
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}
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#endif
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#if 0
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@ -897,7 +875,7 @@ static void prim_map(EvalState & state, Value * * args, Value & v)
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static void prim_length(EvalState & state, Value * * args, Value & v)
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{
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state.forceList(*args[0]);
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mkInt(v, v.list.length);
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mkInt(v, args[0]->list.length);
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}
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@ -1111,11 +1089,11 @@ void EvalState::createBaseEnv()
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// Expr <-> String
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addPrimOp("__exprToString", 1, prim_exprToString);
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addPrimOp("__stringToExpr", 1, prim_stringToExpr);
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#endif
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// Derivations
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addPrimOp("derivation!", 1, prim_derivationStrict);
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addPrimOp("derivation", 1, prim_derivationLazy);
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#endif
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addPrimOp("derivation", 1, prim_derivationStrict);
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//addPrimOp("derivation", 1, prim_derivationLazy);
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// Paths
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addPrimOp("__toPath", 1, prim_toPath);
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@ -1130,7 +1108,9 @@ void EvalState::createBaseEnv()
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// Creating files
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#if 0
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addPrimOp("__toXML", 1, prim_toXML);
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#endif
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addPrimOp("__toFile", 2, prim_toFile);
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#if 0
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addPrimOp("__filterSource", 2, prim_filterSource);
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#endif
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@ -1140,8 +1120,8 @@ void EvalState::createBaseEnv()
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addPrimOp("__hasAttr", 2, prim_hasAttr);
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addPrimOp("__isAttrs", 1, prim_isAttrs);
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addPrimOp("removeAttrs", 2, prim_removeAttrs);
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#if 0
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addPrimOp("__listToAttrs", 1, prim_listToAttrs);
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#if 0
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addPrimOp("__intersectAttrs", 2, prim_intersectAttrs);
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addPrimOp("__functionArgs", 1, prim_functionArgs);
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#endif
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