371 lines
11 KiB
C++
371 lines
11 KiB
C++
#include "normalise.hh"
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#include "eval.hh"
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#include "globals.hh"
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#include "nixexpr-ast.hh"
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/* Load and evaluate an expression from path specified by the
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argument. */
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static Expr primImport(EvalState & state, const ATermVector & args)
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{
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ATerm path;
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Expr fn = evalExpr(state, args[0]);
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if (!matchPath(fn, path))
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throw Error("path expected");
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return evalFile(state, aterm2String(path));
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}
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static PathSet storeExprRootsCached(EvalState & state, const Path & nePath)
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{
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DrvRoots::iterator i = state.drvRoots.find(nePath);
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if (i != state.drvRoots.end())
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return i->second;
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else {
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PathSet paths = storeExprRoots(nePath);
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state.drvRoots[nePath] = paths;
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return paths;
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}
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}
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static Hash hashDerivation(EvalState & state, StoreExpr ne)
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{
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if (ne.type == StoreExpr::neDerivation) {
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PathSet inputs2;
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for (PathSet::iterator i = ne.derivation.inputs.begin();
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i != ne.derivation.inputs.end(); i++)
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{
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DrvHashes::iterator j = state.drvHashes.find(*i);
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if (j == state.drvHashes.end())
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throw Error(format("don't know expression `%1%'") % (string) *i);
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inputs2.insert(printHash(j->second));
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}
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ne.derivation.inputs = inputs2;
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}
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return hashTerm(unparseStoreExpr(ne));
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}
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static Path copyAtom(EvalState & state, const Path & srcPath)
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{
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/* !!! should be cached */
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Path dstPath(addToStore(srcPath));
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ClosureElem elem;
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StoreExpr ne;
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ne.type = StoreExpr::neClosure;
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ne.closure.roots.insert(dstPath);
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ne.closure.elems[dstPath] = elem;
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Hash drvHash = hashDerivation(state, ne);
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Path drvPath = writeTerm(unparseStoreExpr(ne), "c");
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state.drvHashes[drvPath] = drvHash;
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state.drvRoots[drvPath] = ne.closure.roots;
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printMsg(lvlChatty, format("copied `%1%' -> closure `%2%'")
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% srcPath % drvPath);
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return drvPath;
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}
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static string addInput(EvalState & state,
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Path & nePath, StoreExpr & ne)
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{
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PathSet paths = storeExprRootsCached(state, nePath);
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if (paths.size() != 1) abort();
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Path path = *(paths.begin());
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ne.derivation.inputs.insert(nePath);
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return path;
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}
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static void processBinding(EvalState & state, Expr e, StoreExpr & ne,
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Strings & ss)
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{
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e = evalExpr(state, e);
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ATerm s;
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ATermList es;
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int n;
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Expr e1, e2;
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if (matchStr(e, s)) ss.push_back(aterm2String(s));
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else if (matchUri(e, s)) ss.push_back(aterm2String(s));
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else if (e == eTrue) ss.push_back("1");
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else if (e == eFalse) ss.push_back("");
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else if (matchInt(e, n)) {
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ostringstream st;
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st << n;
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ss.push_back(st.str());
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}
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else if (matchAttrs(e, es)) {
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Expr a = queryAttr(e, "type");
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if (a && evalString(state, a) == "derivation") {
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a = queryAttr(e, "drvPath");
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if (!a) throw Error("derivation name missing");
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Path drvPath = evalPath(state, a);
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a = queryAttr(e, "drvHash");
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if (!a) throw Error("derivation hash missing");
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Hash drvHash = parseHash(htMD5, evalString(state, a));
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a = queryAttr(e, "outPath");
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if (!a) throw Error("output path missing");
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PathSet drvRoots;
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drvRoots.insert(evalPath(state, a));
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state.drvHashes[drvPath] = drvHash;
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state.drvRoots[drvPath] = drvRoots;
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ss.push_back(addInput(state, drvPath, ne));
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} else
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throw Error("invalid derivation attribute");
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}
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else if (matchPath(e, s)) {
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Path drvPath = copyAtom(state, aterm2String(s));
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ss.push_back(addInput(state, drvPath, ne));
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}
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else if (matchList(e, es)) {
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for (ATermIterator i(es); i; ++i) {
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startNest(nest, lvlVomit, format("processing list element"));
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processBinding(state, evalExpr(state, *i), ne, ss);
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}
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}
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else if (matchNull(e)) ss.push_back("");
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else if (matchSubPath(e, e1, e2)) {
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Strings ss2;
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processBinding(state, evalExpr(state, e1), ne, ss2);
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if (ss2.size() != 1)
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throw Error("left-hand side of `~' operator cannot be a list");
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e2 = evalExpr(state, e2);
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if (!(matchStr(e2, s) || matchPath(e2, s)))
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throw Error("right-hand side of `~' operator must be a path or string");
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ss.push_back(canonPath(ss2.front() + "/" + aterm2String(s)));
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}
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else throw Error("invalid derivation attribute");
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}
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static string concatStrings(const Strings & ss)
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{
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string s;
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bool first = true;
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for (Strings::const_iterator i = ss.begin(); i != ss.end(); ++i) {
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if (!first) s += " "; else first = false;
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s += *i;
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}
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return s;
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}
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/* Construct (as a unobservable side effect) a Nix derivation
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expression that performs the derivation described by the argument
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set. Returns the original set extended with the following
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attributes: `outPath' containing the primary output path of the
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derivation; `drvPath' containing the path of the Nix expression;
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and `type' set to `derivation' to indicate that this is a
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derivation. */
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static Expr primDerivation(EvalState & state, const ATermVector & _args)
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{
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startNest(nest, lvlVomit, "evaluating derivation");
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ATermMap attrs;
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Expr args = _args[0];
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args = evalExpr(state, args);
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queryAllAttrs(args, attrs, true);
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/* Build the derivation expression by processing the attributes. */
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StoreExpr ne;
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ne.type = StoreExpr::neDerivation;
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string drvName;
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Hash outHash;
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bool outHashGiven = false;
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for (ATermIterator i(attrs.keys()); i; ++i) {
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string key = aterm2String(*i);
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ATerm value;
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Expr pos;
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ATerm rhs = attrs.get(key);
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if (!matchAttrRHS(rhs, value, pos)) abort();
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startNest(nest, lvlVomit, format("processing attribute `%1%'") % key);
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Strings ss;
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try {
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processBinding(state, value, ne, ss);
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} catch (Error & e) {
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throw Error(format("while processing the derivation attribute `%1%' at %2%:\n%3%")
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% key % showPos(pos) % e.msg());
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}
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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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for (Strings::iterator i = ss.begin(); i != ss.end(); ++i)
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ne.derivation.args.push_back(*i);
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}
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/* All other attributes are passed to the builder through the
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environment. */
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else {
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string s = concatStrings(ss);
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ne.derivation.env[key] = s;
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if (key == "builder") ne.derivation.builder = s;
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else if (key == "system") ne.derivation.platform = s;
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else if (key == "name") drvName = s;
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else if (key == "id") {
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outHash = parseHash(htMD5, s);
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outHashGiven = true;
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}
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}
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}
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/* Do we have all required attributes? */
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if (ne.derivation.builder == "")
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throw Error("required attribute `builder' missing");
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if (ne.derivation.platform == "")
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throw Error("required attribute `system' missing");
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if (drvName == "")
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throw Error("required attribute `name' missing");
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/* Check the derivation name. It shouldn't contain whitespace,
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but we are conservative here: we check whether only
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alphanumerics and some other characters appear. */
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string validChars = "+-._?=";
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for (string::iterator i = drvName.begin(); i != drvName.end(); ++i)
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if (!((*i >= 'A' && *i <= 'Z') ||
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(*i >= 'a' && *i <= 'z') ||
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(*i >= '0' && *i <= '9') ||
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validChars.find(*i) != string::npos))
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{
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throw Error(format("invalid character `%1%' in derivation name `%2%'")
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% *i % drvName);
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}
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/* Construct the "masked" derivation store expression, which is
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the final one except that the list of output paths is set to
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the set of output names, and the corresponding environment
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variables have an empty value. This ensures that changes in
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the set of output names do get reflected in the hash. */
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ne.derivation.env["out"] = "";
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ne.derivation.outputs.insert("out");
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/* Determine the output path by hashing the Nix expression with no
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outputs to produce a unique but deterministic path name for
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this derivation. */
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if (!outHashGiven) outHash = hashDerivation(state, ne);
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Path outPath = makeStorePath("output:out",
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outHash, drvName);
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/* Construct the final derivation store expression. */
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ne.derivation.env["out"] = outPath;
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ne.derivation.outputs.clear();
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ne.derivation.outputs.insert(outPath);
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/* Write the resulting term into the Nix store directory. */
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Hash drvHash = outHashGiven
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? hashString(printHash(outHash) + outPath, htMD5)
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: hashDerivation(state, ne);
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Path drvPath = writeTerm(unparseStoreExpr(ne), "d-" + drvName);
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printMsg(lvlChatty, format("instantiated `%1%' -> `%2%'")
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% drvName % drvPath);
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attrs.set("outPath", makeAttrRHS(makePath(toATerm(outPath)), makeNoPos()));
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attrs.set("drvPath", makeAttrRHS(makePath(toATerm(drvPath)), makeNoPos()));
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attrs.set("drvHash",
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makeAttrRHS(makeStr(toATerm(printHash(drvHash))), makeNoPos()));
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attrs.set("type", makeAttrRHS(makeStr(toATerm("derivation")), makeNoPos()));
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return makeAttrs(attrs);
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}
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/* Return the base name of the given string, i.e., everything
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following the last slash. */
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static Expr primBaseNameOf(EvalState & state, const ATermVector & args)
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{
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return makeStr(toATerm(baseNameOf(evalString(state, args[0]))));
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}
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/* Convert the argument (which can be a path or a uri) to a string. */
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static Expr primToString(EvalState & state, const ATermVector & args)
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{
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Expr arg = evalExpr(state, args[0]);
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ATerm s;
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if (matchStr(arg, s) || matchPath(arg, s) || matchUri(arg, s))
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return makeStr(s);
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else throw Error("cannot coerce value to string");
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}
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/* Boolean constructors. */
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static Expr primTrue(EvalState & state, const ATermVector & args)
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{
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return eTrue;
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}
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static Expr primFalse(EvalState & state, const ATermVector & args)
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{
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return eFalse;
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}
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/* Return the null value. */
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Expr primNull(EvalState & state, const ATermVector & args)
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{
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return makeNull();
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}
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/* Determine whether the argument is the null value. */
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Expr primIsNull(EvalState & state, const ATermVector & args)
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{
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return makeBool(matchNull(evalExpr(state, args[0])));
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}
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/* Apply a function to every element of a list. */
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Expr primMap(EvalState & state, const ATermVector & args)
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{
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Expr fun = evalExpr(state, args[0]);
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Expr list = evalExpr(state, args[1]);
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ATermList list2;
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if (!matchList(list, list2))
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throw Error("`map' expects a list as its second argument");
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ATermList list3 = ATempty;
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for (ATermIterator i(list2); i; ++i)
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list3 = ATinsert(list3, makeCall(fun, *i));
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return makeList(ATreverse(list3));
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}
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void EvalState::addPrimOps()
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{
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addPrimOp("true", 0, primTrue);
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addPrimOp("false", 0, primFalse);
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addPrimOp("null", 0, primNull);
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addPrimOp("import", 1, primImport);
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addPrimOp("derivation", 1, primDerivation);
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addPrimOp("baseNameOf", 1, primBaseNameOf);
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addPrimOp("toString", 1, primToString);
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addPrimOp("isNull", 1, primIsNull);
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addPrimOp("map", 2, primMap);
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}
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