forked from lix-project/lix
f958bcdf1f
{stdenv, bash}: derivation {
builder = bash ~ /bin/sh;
args = ["-e" "-x" ./builder.sh];
...
}
Here the attribute `builder' will evaluate to, e.g.,
`/nix/store/1234abcd...-bash-2.0.1/bin/sh'.
289 lines
8.1 KiB
C++
289 lines
8.1 KiB
C++
#include "primops.hh"
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#include "normalise.hh"
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#include "globals.hh"
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Expr primImport(EvalState & state, Expr arg)
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{
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ATMatcher m;
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string path;
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if (!(atMatch(m, arg) >> "Path" >> path))
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throw badTerm("path expected", arg);
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return evalFile(state, 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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DrvPaths::iterator i = state.drvPaths.find(nePath);
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if (i != state.drvPaths.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.drvPaths[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(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), "");
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state.drvHashes[drvPath] = drvHash;
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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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ATMatcher m;
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string 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 (atMatch(m, e) >> "Str" >> s) ss.push_back(s);
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else if (atMatch(m, e) >> "Uri" >> s) ss.push_back(s);
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else if (atMatch(m, e) >> "Bool" >> "True") ss.push_back("1");
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else if (atMatch(m, e) >> "Bool" >> "False") ss.push_back("");
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else if (atMatch(m, e) >> "Int" >> 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 (atMatch(m, e) >> "Attrs") {
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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 badTerm("derivation name missing", e);
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Path drvPath = evalPath(state, a);
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a = queryAttr(e, "drvHash");
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if (!a) throw badTerm("derivation hash missing", e);
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Hash drvHash = parseHash(evalString(state, a));
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state.drvHashes[drvPath] = drvHash;
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ss.push_back(addInput(state, drvPath, ne));
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} else
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throw badTerm("invalid derivation binding", e);
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}
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else if (atMatch(m, e) >> "Path" >> s) {
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Path drvPath = copyAtom(state, s);
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ss.push_back(addInput(state, drvPath, ne));
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}
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else if (atMatch(m, e) >> "List" >> 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 (atMatch(m, e) >> "Null") ss.push_back("");
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else if (atMatch(m, e) >> "SubPath" >> 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 (!(atMatch(m, e2) >> "Str" >> s ||
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(atMatch(m, e2) >> "Path" >> 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() + "/" + s));
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}
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else throw badTerm("invalid derivation binding", e);
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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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Expr primDerivation(EvalState & state, Expr args)
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{
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startNest(nest, lvlVomit, "evaluating derivation");
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ATermMap attrs;
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args = evalExpr(state, args);
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queryAllAttrs(args, attrs);
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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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Path outPath;
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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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Expr value = attrs.get(key);
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startNest(nest, lvlVomit, format("processing attribute `%1%'") % key);
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Strings ss;
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processBinding(state, value, ne, ss);
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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 == "outPath") outPath = s;
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else if (key == "id") {
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outHash = parseHash(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 badTerm("required attribute `builder' missing", args);
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if (ne.derivation.platform == "")
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throw badTerm("required attribute `system' missing", args);
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if (drvName == "")
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throw badTerm("required attribute `name' missing", args);
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/* Determine the output path. */
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if (!outHashGiven) outHash = hashDerivation(state, ne);
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if (outPath == "")
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/* Hash the Nix expression with no outputs to produce a
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unique but deterministic path name for this derivation. */
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outPath = canonPath(nixStore + "/" +
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((string) outHash).c_str() + "-" + drvName);
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ne.derivation.env["out"] = outPath;
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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((string) outHash + outPath)
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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", ATmake("Path(<str>)", outPath.c_str()));
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attrs.set("drvPath", ATmake("Path(<str>)", drvPath.c_str()));
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attrs.set("drvHash", ATmake("Str(<str>)", ((string) drvHash).c_str()));
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attrs.set("type", ATmake("Str(\"derivation\")"));
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return makeAttrs(attrs);
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}
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Expr primBaseNameOf(EvalState & state, Expr arg)
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{
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string s = evalString(state, arg);
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return ATmake("Str(<str>)", baseNameOf(s).c_str());
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}
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Expr primToString(EvalState & state, Expr arg)
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{
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arg = evalExpr(state, arg);
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ATMatcher m;
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string s;
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if (atMatch(m, arg) >> "Str" >> s ||
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atMatch(m, arg) >> "Path" >> s ||
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atMatch(m, arg) >> "Uri" >> s)
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return ATmake("Str(<str>)", s.c_str());
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else throw badTerm("cannot coerce to string", arg);
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}
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Expr primTrue(EvalState & state)
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{
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return ATmake("Bool(True)");
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}
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Expr primFalse(EvalState & state)
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{
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return ATmake("Bool(False)");
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}
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Expr primNull(EvalState & state)
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{
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return ATmake("Null");
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}
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Expr primIsNull(EvalState & state, Expr arg)
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{
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arg = evalExpr(state, arg);
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ATMatcher m;
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return makeBool(atMatch(m, arg) >> "Null");
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}
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