forked from lix-project/lix
![Eelco Dolstra](/assets/img/avatar_default.png)
allowed. So `name1@name2', `{attrs1}@{attrs2}' and so on are now no longer legal. This is no big loss because they were not useful anyway. This also changes the output of builtins.toXML for @-patterns slightly.
1198 lines
38 KiB
C++
1198 lines
38 KiB
C++
#include "misc.hh"
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#include "eval.hh"
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#include "globals.hh"
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#include "store-api.hh"
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#include "util.hh"
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#include "archive.hh"
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#include "expr-to-xml.hh"
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#include "nixexpr-ast.hh"
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#include "parser.hh"
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#include "names.hh"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <algorithm>
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namespace nix {
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/*************************************************************
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* Constants
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*************************************************************/
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static Expr prim_builtins(EvalState & state, const ATermVector & args)
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{
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/* Return an attribute set containing all primops. This allows
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Nix expressions to test for new primops and take appropriate
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action if they're not available. For instance, rather than
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calling a primop `foo' directly, they could say `if builtins ?
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foo then builtins.foo ... else ...'. */
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ATermMap builtins(state.primOps.size());
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for (ATermMap::const_iterator i = state.primOps.begin();
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i != state.primOps.end(); ++i)
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{
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string name = aterm2String(i->key);
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if (string(name, 0, 2) == "__")
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name = string(name, 2);
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/* !!! should use makePrimOp here, I guess. */
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builtins.set(toATerm(name), makeAttrRHS(makeVar(i->key), makeNoPos()));
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}
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return makeAttrs(builtins);
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}
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/* Boolean constructors. */
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static Expr prim_true(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 prim_false(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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static Expr prim_null(EvalState & state, const ATermVector & args)
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{
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return makeNull();
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}
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/* Return a string constant representing the current platform. Note!
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that differs between platforms, so Nix expressions using
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`__currentSystem' can evaluate to different values on different
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platforms. */
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static Expr prim_currentSystem(EvalState & state, const ATermVector & args)
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{
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return makeStr(thisSystem);
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}
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static Expr prim_currentTime(EvalState & state, const ATermVector & args)
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{
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return ATmake("Int(<int>)", time(0));
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}
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/*************************************************************
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* Miscellaneous
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*************************************************************/
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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 prim_import(EvalState & state, const ATermVector & args)
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{
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PathSet context;
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Path path = coerceToPath(state, args[0], context);
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for (PathSet::iterator i = context.begin(); i != context.end(); ++i) {
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assert(isStorePath(*i));
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if (!store->isValidPath(*i))
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throw EvalError(format("cannot import `%1%', since path `%2%' is not valid")
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% path % *i);
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if (isDerivation(*i))
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store->buildDerivations(singleton<PathSet>(*i));
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}
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return evalFile(state, path);
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}
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/* Determine whether the argument is the null value. */
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static Expr prim_isNull(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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/* Determine whether the argument is a function. */
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static Expr prim_isFunction(EvalState & state, const ATermVector & args)
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{
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Expr e = evalExpr(state, args[0]);
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Pattern pat;
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ATerm body, pos;
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return makeBool(matchFunction(e, pat, body, pos));
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}
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/* Determine whether the argument is an Int. */
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static Expr prim_isInt(EvalState & state, const ATermVector & args)
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{
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int i;
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return makeBool(matchInt(evalExpr(state, args[0]), i));
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}
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/* Determine whether the argument is an String. */
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static Expr prim_isString(EvalState & state, const ATermVector & args)
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{
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string s;
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PathSet l;
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return makeBool(matchStr(evalExpr(state, args[0]), s, l));
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}
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/* Determine whether the argument is an Bool. */
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static Expr prim_isBool(EvalState & state, const ATermVector & args)
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{
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ATermBool b;
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return makeBool(matchBool(evalExpr(state, args[0]), b));
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}
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static Expr prim_genericClosure(EvalState & state, const ATermVector & args)
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{
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startNest(nest, lvlDebug, "finding dependencies");
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Expr attrs = evalExpr(state, args[0]);
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/* Get the start set. */
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Expr startSet = queryAttr(attrs, "startSet");
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if (!startSet) throw EvalError("attribute `startSet' required");
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ATermList startSet2 = evalList(state, startSet);
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set<Expr> workSet; // !!! gc roots
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for (ATermIterator i(startSet2); i; ++i) workSet.insert(*i);
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/* Get the operator. */
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Expr op = queryAttr(attrs, "operator");
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if (!op) throw EvalError("attribute `operator' required");
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/* Construct the closure by applying the operator to element of
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`workSet', adding the result to `workSet', continuing until
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no new elements are found. */
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ATermList res = ATempty;
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set<Expr> doneKeys; // !!! gc roots
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while (!workSet.empty()) {
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Expr e = *(workSet.begin());
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workSet.erase(e);
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e = strictEvalExpr(state, e);
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Expr key = queryAttr(e, "key");
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if (!key) throw EvalError("attribute `key' required");
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if (doneKeys.find(key) != doneKeys.end()) continue;
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doneKeys.insert(key);
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res = ATinsert(res, e);
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/* Call the `operator' function with `e' as argument. */
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ATermList res = evalList(state, makeCall(op, e));
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/* Try to find the dependencies relative to the `path'. */
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for (ATermIterator i(res); i; ++i)
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workSet.insert(evalExpr(state, *i));
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}
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return makeList(res);
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}
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static Expr prim_abort(EvalState & state, const ATermVector & args)
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{
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PathSet context;
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throw Abort(format("evaluation aborted with the following error message: `%1%'") %
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evalString(state, args[0], context));
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}
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static Expr prim_throw(EvalState & state, const ATermVector & args)
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{
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PathSet context;
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throw ThrownError(format("user-thrown exception: %1%") %
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evalString(state, args[0], context));
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}
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static Expr prim_addErrorContext(EvalState & state, const ATermVector & args)
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{
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PathSet context;
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try {
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return evalExpr(state, args[1]);
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} catch (Error & e) {
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e.addPrefix(format("%1%\n") %
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evalString(state, args[0], context));
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throw;
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}
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}
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/* Try evaluating the argument. Success => {success=true; value=something;},
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* else => {success=false; value=false;} */
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static Expr prim_tryEval(EvalState & state, const ATermVector & args)
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{
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ATermMap res = ATermMap();
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try {
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Expr val = evalExpr(state, args[0]);
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res.set(toATerm("value"), makeAttrRHS(val, makeNoPos()));
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res.set(toATerm("success"), makeAttrRHS(eTrue, makeNoPos()));
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} catch (AssertionError & e) {
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printMsg(lvlDebug, format("tryEval caught an error: %1%: %2%") % e.prefix() % e.msg());
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res.set(toATerm("value"), makeAttrRHS(eFalse, makeNoPos()));
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res.set(toATerm("success"), makeAttrRHS(eFalse, makeNoPos()));
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}
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return makeAttrs(res);
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}
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/* Return an environment variable. Use with care. */
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static Expr prim_getEnv(EvalState & state, const ATermVector & args)
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{
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string name = evalStringNoCtx(state, args[0]);
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return makeStr(getEnv(name));
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}
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/* Evaluate the first expression, and print its abstract syntax tree
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on standard error. Then return the second expression. Useful for
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debugging.
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*/
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static Expr prim_trace(EvalState & state, const ATermVector & args)
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{
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Expr e = evalExpr(state, args[0]);
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string s;
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PathSet context;
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if (matchStr(e, s, context))
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printMsg(lvlError, format("trace: %1%") % s);
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else
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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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/*************************************************************
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* Derivations
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*************************************************************/
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static bool isFixedOutput(const Derivation & drv)
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{
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return drv.outputs.size() == 1 &&
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drv.outputs.begin()->first == "out" &&
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drv.outputs.begin()->second.hash != "";
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}
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/* Returns the hash of a derivation modulo fixed-output
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subderivations. A fixed-output derivation is a derivation with one
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output (`out') for which an expected hash and hash algorithm are
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specified (using the `outputHash' and `outputHashAlgo'
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attributes). We don't want changes to such derivations to
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propagate upwards through the dependency graph, changing output
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paths everywhere.
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For instance, if we change the url in a call to the `fetchurl'
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function, we do not want to rebuild everything depending on it
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(after all, (the hash of) the file being downloaded is unchanged).
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So the *output paths* should not change. On the other hand, the
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*derivation paths* should change to reflect the new dependency
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graph.
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That's what this function does: it returns a hash which is just the
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hash of the derivation ATerm, except that any input derivation
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paths have been replaced by the result of a recursive call to this
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function, and that for fixed-output derivations we return a hash of
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its output path. */
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static Hash hashDerivationModulo(EvalState & state, Derivation drv)
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{
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/* Return a fixed hash for fixed-output derivations. */
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if (isFixedOutput(drv)) {
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DerivationOutputs::const_iterator i = drv.outputs.begin();
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return hashString(htSHA256, "fixed:out:"
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+ i->second.hashAlgo + ":"
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+ i->second.hash + ":"
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+ i->second.path);
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}
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/* For other derivations, replace the inputs paths with recursive
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calls to this function.*/
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DerivationInputs inputs2;
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foreach (DerivationInputs::const_iterator, i, drv.inputDrvs) {
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Hash h = state.drvHashes[i->first];
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if (h.type == htUnknown) {
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Derivation drv2 = derivationFromPath(i->first);
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h = hashDerivationModulo(state, drv2);
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state.drvHashes[i->first] = h;
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}
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inputs2[printHash(h)] = i->second;
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}
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drv.inputDrvs = inputs2;
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return hashTerm(unparseDerivation(drv));
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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 prim_derivationStrict(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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queryAllAttrs(evalExpr(state, args[0]), attrs, true);
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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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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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} 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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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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PathSet context;
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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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startNest(nest, lvlVomit, format("processing attribute `%1%'") % key);
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try {
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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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drv.args.push_back(s);
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}
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}
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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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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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else if (key == "name") drvName = s;
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else if (key == "outputHash") outputHash = s;
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else if (key == "outputHashAlgo") outputHashAlgo = s;
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else if (key == "outputHashMode") {
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if (s == "recursive") outputHashRecursive = true;
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else if (s == "flat") outputHashRecursive = false;
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else throw EvalError(format("invalid value `%1%' for `outputHashMode' attribute") % s);
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}
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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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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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attributes should be added as dependencies of the resulting
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derivation. */
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foreach (PathSet::iterator, i, context) {
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Path path = *i;
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/* Paths marked with `=' denote that the path of a derivation
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is explicitly passed to the builder. Since that allows the
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builder to gain access to every path in the dependency
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graph of the derivation (including all outputs), all paths
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in the graph must be added to this derivation's list of
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inputs to ensure that they are available when the builder
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runs. */
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if (path.at(0) == '=') {
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path = string(path, 1);
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PathSet refs; computeFSClosure(path, refs);
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foreach (PathSet::iterator, j, refs) {
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drv.inputSrcs.insert(*j);
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if (isDerivation(*j))
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drv.inputDrvs[*j] = singleton<StringSet>("out");
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}
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}
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/* See prim_unsafeDiscardOutputDependency. */
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bool useDrvAsSrc = false;
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if (path.at(0) == '~') {
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path = string(path, 1);
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useDrvAsSrc = true;
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}
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assert(isStorePath(path));
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debug(format("derivation uses `%1%'") % path);
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if (!useDrvAsSrc && isDerivation(path))
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drv.inputDrvs[path] = singleton<StringSet>("out");
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else
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drv.inputSrcs.insert(path);
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}
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/* Do we have all required attributes? */
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if (drv.builder == "")
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throw EvalError("required attribute `builder' missing");
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if (drv.platform == "")
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throw EvalError("required attribute `system' missing");
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/* If an output hash was given, check it. */
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Path outPath;
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if (outputHash == "")
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outputHashAlgo = "";
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else {
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HashType ht = parseHashType(outputHashAlgo);
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if (ht == htUnknown)
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throw EvalError(format("unknown hash algorithm `%1%'") % outputHashAlgo);
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Hash h(ht);
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if (outputHash.size() == h.hashSize * 2)
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/* hexadecimal representation */
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h = parseHash(ht, outputHash);
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else if (outputHash.size() == hashLength32(h))
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/* base-32 representation */
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h = parseHash32(ht, outputHash);
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else
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throw Error(format("hash `%1%' has wrong length for hash type `%2%'")
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% outputHash % outputHashAlgo);
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string s = outputHash;
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outputHash = printHash(h);
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outPath = makeFixedOutputPath(outputHashRecursive, ht, h, drvName);
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if (outputHashRecursive) outputHashAlgo = "r:" + outputHashAlgo;
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}
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/* Check whether the derivation name is valid. */
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checkStoreName(drvName);
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if (isDerivation(drvName))
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throw EvalError(format("derivation names are not allowed to end in `%1%'")
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% drvExtension);
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/* Construct the "masked" derivation store expression, which is
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the final one except that in the list of outputs, the output
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paths are empty, and the corresponding environment variables
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have an empty value. This ensures that changes in the set of
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output names do get reflected in the hash. */
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drv.env["out"] = "";
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drv.outputs["out"] = DerivationOutput("", outputHashAlgo, outputHash);
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/* Use the masked derivation expression to compute the output
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path. */
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if (outPath == "")
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outPath = makeStorePath("output:out", hashDerivationModulo(state, drv), drvName);
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/* Construct the final derivation store expression. */
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drv.env["out"] = outPath;
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drv.outputs["out"] =
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DerivationOutput(outPath, outputHashAlgo, outputHash);
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|
|
/* Write the resulting term into the Nix store directory. */
|
|
Path drvPath = writeDerivation(drv, drvName);
|
|
|
|
printMsg(lvlChatty, format("instantiated `%1%' -> `%2%'")
|
|
% drvName % drvPath);
|
|
|
|
/* Optimisation, but required in read-only mode! because in that
|
|
case we don't actually write store expressions, so we can't
|
|
read them later. */
|
|
state.drvHashes[drvPath] = hashDerivationModulo(state, drv);
|
|
|
|
/* !!! assumes a single output */
|
|
ATermMap outAttrs(2);
|
|
outAttrs.set(toATerm("outPath"),
|
|
makeAttrRHS(makeStr(outPath, singleton<PathSet>(drvPath)), makeNoPos()));
|
|
outAttrs.set(toATerm("drvPath"),
|
|
makeAttrRHS(makeStr(drvPath, singleton<PathSet>("=" + drvPath)), makeNoPos()));
|
|
|
|
return makeAttrs(outAttrs);
|
|
}
|
|
|
|
|
|
static Expr prim_derivationLazy(EvalState & state, const ATermVector & args)
|
|
{
|
|
Expr eAttrs = evalExpr(state, args[0]);
|
|
ATermMap attrs;
|
|
queryAllAttrs(eAttrs, attrs, true);
|
|
|
|
attrs.set(toATerm("type"),
|
|
makeAttrRHS(makeStr("derivation"), makeNoPos()));
|
|
|
|
Expr drvStrict = makeCall(makeVar(toATerm("derivation!")), eAttrs);
|
|
|
|
attrs.set(toATerm("outPath"),
|
|
makeAttrRHS(makeSelect(drvStrict, toATerm("outPath")), makeNoPos()));
|
|
attrs.set(toATerm("drvPath"),
|
|
makeAttrRHS(makeSelect(drvStrict, toATerm("drvPath")), makeNoPos()));
|
|
|
|
return makeAttrs(attrs);
|
|
}
|
|
|
|
|
|
/*************************************************************
|
|
* Paths
|
|
*************************************************************/
|
|
|
|
|
|
/* Convert the argument to a path. !!! obsolete? */
|
|
static Expr prim_toPath(EvalState & state, const ATermVector & args)
|
|
{
|
|
PathSet context;
|
|
string path = coerceToPath(state, args[0], context);
|
|
return makeStr(canonPath(path), context);
|
|
}
|
|
|
|
|
|
/* Allow a valid store path to be used in an expression. This is
|
|
useful in some generated expressions such as in nix-push, which
|
|
generates a call to a function with an already existing store path
|
|
as argument. You don't want to use `toPath' here because it copies
|
|
the path to the Nix store, which yields a copy like
|
|
/nix/store/newhash-oldhash-oldname. In the past, `toPath' had
|
|
special case behaviour for store paths, but that created weird
|
|
corner cases. */
|
|
static Expr prim_storePath(EvalState & state, const ATermVector & args)
|
|
{
|
|
PathSet context;
|
|
Path path = canonPath(coerceToPath(state, args[0], context));
|
|
if (!isInStore(path))
|
|
throw EvalError(format("path `%1%' is not in the Nix store") % path);
|
|
Path path2 = toStorePath(path);
|
|
if (!store->isValidPath(path2))
|
|
throw EvalError(format("store path `%1%' is not valid") % path2);
|
|
context.insert(path2);
|
|
return makeStr(path, context);
|
|
}
|
|
|
|
|
|
static Expr prim_pathExists(EvalState & state, const ATermVector & args)
|
|
{
|
|
PathSet context;
|
|
Path path = coerceToPath(state, args[0], context);
|
|
if (!context.empty())
|
|
throw EvalError(format("string `%1%' cannot refer to other paths") % path);
|
|
return makeBool(pathExists(path));
|
|
}
|
|
|
|
|
|
/* Return the base name of the given string, i.e., everything
|
|
following the last slash. */
|
|
static Expr prim_baseNameOf(EvalState & state, const ATermVector & args)
|
|
{
|
|
PathSet context;
|
|
return makeStr(baseNameOf(coerceToString(state, args[0], context)), context);
|
|
}
|
|
|
|
|
|
/* Return the directory of the given path, i.e., everything before the
|
|
last slash. Return either a path or a string depending on the type
|
|
of the argument. */
|
|
static Expr prim_dirOf(EvalState & state, const ATermVector & args)
|
|
{
|
|
PathSet context;
|
|
Expr e = evalExpr(state, args[0]); ATerm dummy;
|
|
bool isPath = matchPath(e, dummy);
|
|
Path dir = dirOf(coerceToPath(state, e, context));
|
|
return isPath ? makePath(toATerm(dir)) : makeStr(dir, context);
|
|
}
|
|
|
|
|
|
/* Return the contents of a file as a string. */
|
|
static Expr prim_readFile(EvalState & state, const ATermVector & args)
|
|
{
|
|
PathSet context;
|
|
Path path = coerceToPath(state, args[0], context);
|
|
if (!context.empty())
|
|
throw EvalError(format("string `%1%' cannot refer to other paths") % path);
|
|
return makeStr(readFile(path));
|
|
}
|
|
|
|
|
|
/*************************************************************
|
|
* Creating files
|
|
*************************************************************/
|
|
|
|
|
|
/* Convert the argument (which can be any Nix expression) to an XML
|
|
representation returned in a string. Not all Nix expressions can
|
|
be sensibly or completely represented (e.g., functions). */
|
|
static Expr prim_toXML(EvalState & state, const ATermVector & args)
|
|
{
|
|
std::ostringstream out;
|
|
PathSet context;
|
|
printTermAsXML(strictEvalExpr(state, args[0]), out, context);
|
|
return makeStr(out.str(), context);
|
|
}
|
|
|
|
|
|
/* Store a string in the Nix store as a source file that can be used
|
|
as an input by derivations. */
|
|
static Expr prim_toFile(EvalState & state, const ATermVector & args)
|
|
{
|
|
PathSet context;
|
|
string name = evalStringNoCtx(state, args[0]);
|
|
string contents = evalString(state, args[1], context);
|
|
|
|
PathSet refs;
|
|
|
|
for (PathSet::iterator i = context.begin(); i != context.end(); ++i) {
|
|
Path path = *i;
|
|
if (path.at(0) == '=') path = string(path, 1);
|
|
if (isDerivation(path))
|
|
throw EvalError(format("in `toFile': the file `%1%' cannot refer to derivation outputs") % name);
|
|
refs.insert(path);
|
|
}
|
|
|
|
Path storePath = readOnlyMode
|
|
? computeStorePathForText(name, contents, refs)
|
|
: store->addTextToStore(name, contents, refs);
|
|
|
|
/* Note: we don't need to add `context' to the context of the
|
|
result, since `storePath' itself has references to the paths
|
|
used in args[1]. */
|
|
|
|
return makeStr(storePath, singleton<PathSet>(storePath));
|
|
}
|
|
|
|
|
|
struct FilterFromExpr : PathFilter
|
|
{
|
|
EvalState & state;
|
|
Expr filter;
|
|
|
|
FilterFromExpr(EvalState & state, Expr filter)
|
|
: state(state), filter(filter)
|
|
{
|
|
}
|
|
|
|
bool operator () (const Path & path)
|
|
{
|
|
struct stat st;
|
|
if (lstat(path.c_str(), &st))
|
|
throw SysError(format("getting attributes of path `%1%'") % path);
|
|
|
|
Expr call =
|
|
makeCall(
|
|
makeCall(filter, makeStr(path)),
|
|
makeStr(
|
|
S_ISREG(st.st_mode) ? "regular" :
|
|
S_ISDIR(st.st_mode) ? "directory" :
|
|
S_ISLNK(st.st_mode) ? "symlink" :
|
|
"unknown" /* not supported, will fail! */
|
|
));
|
|
|
|
return evalBool(state, call);
|
|
}
|
|
};
|
|
|
|
|
|
static Expr prim_filterSource(EvalState & state, const ATermVector & args)
|
|
{
|
|
PathSet context;
|
|
Path path = coerceToPath(state, args[1], context);
|
|
if (!context.empty())
|
|
throw EvalError(format("string `%1%' cannot refer to other paths") % path);
|
|
|
|
FilterFromExpr filter(state, args[0]);
|
|
|
|
Path dstPath = readOnlyMode
|
|
? computeStorePathForPath(path, true, htSHA256, filter).first
|
|
: store->addToStore(path, true, htSHA256, filter);
|
|
|
|
return makeStr(dstPath, singleton<PathSet>(dstPath));
|
|
}
|
|
|
|
|
|
/*************************************************************
|
|
* Attribute sets
|
|
*************************************************************/
|
|
|
|
|
|
/* Return the names of the attributes in an attribute set as a sorted
|
|
list of strings. */
|
|
static Expr prim_attrNames(EvalState & state, const ATermVector & args)
|
|
{
|
|
ATermMap attrs;
|
|
queryAllAttrs(evalExpr(state, args[0]), attrs);
|
|
|
|
StringSet names;
|
|
for (ATermMap::const_iterator i = attrs.begin(); i != attrs.end(); ++i)
|
|
names.insert(aterm2String(i->key));
|
|
|
|
ATermList list = ATempty;
|
|
for (StringSet::const_reverse_iterator i = names.rbegin();
|
|
i != names.rend(); ++i)
|
|
list = ATinsert(list, makeStr(*i, PathSet()));
|
|
|
|
return makeList(list);
|
|
}
|
|
|
|
|
|
/* Dynamic version of the `.' operator. */
|
|
static Expr prim_getAttr(EvalState & state, const ATermVector & args)
|
|
{
|
|
string attr = evalStringNoCtx(state, args[0]);
|
|
return evalExpr(state, makeSelect(args[1], toATerm(attr)));
|
|
}
|
|
|
|
|
|
/* Dynamic version of the `?' operator. */
|
|
static Expr prim_hasAttr(EvalState & state, const ATermVector & args)
|
|
{
|
|
string attr = evalStringNoCtx(state, args[0]);
|
|
return evalExpr(state, makeOpHasAttr(args[1], toATerm(attr)));
|
|
}
|
|
|
|
|
|
/* Builds an attribute set from a list specifying (name, value)
|
|
pairs. To be precise, a list [{name = "name1"; value = value1;}
|
|
... {name = "nameN"; value = valueN;}] is transformed to {name1 =
|
|
value1; ... nameN = valueN;}. */
|
|
static Expr prim_listToAttrs(EvalState & state, const ATermVector & args)
|
|
{
|
|
try {
|
|
ATermMap res = ATermMap();
|
|
ATermList list;
|
|
list = evalList(state, args[0]);
|
|
for (ATermIterator i(list); i; ++i){
|
|
// *i should now contain a pointer to the list item expression
|
|
ATermList attrs;
|
|
Expr evaledExpr = evalExpr(state, *i);
|
|
if (matchAttrs(evaledExpr, attrs)){
|
|
Expr e = evalExpr(state, makeSelect(evaledExpr, toATerm("name")));
|
|
string attr = evalStringNoCtx(state,e);
|
|
Expr r = makeSelect(evaledExpr, toATerm("value"));
|
|
res.set(toATerm(attr), makeAttrRHS(r, makeNoPos()));
|
|
}
|
|
else
|
|
throw TypeError(format("list element in `listToAttrs' is %s, expected a set { name = \"<name>\"; value = <value>; }")
|
|
% showType(evaledExpr));
|
|
}
|
|
|
|
return makeAttrs(res);
|
|
|
|
} catch (Error & e) {
|
|
e.addPrefix(format("in `listToAttrs':\n"));
|
|
throw;
|
|
}
|
|
}
|
|
|
|
|
|
static Expr prim_removeAttrs(EvalState & state, const ATermVector & args)
|
|
{
|
|
ATermMap attrs;
|
|
queryAllAttrs(evalExpr(state, args[0]), attrs, true);
|
|
|
|
ATermList list = evalList(state, args[1]);
|
|
|
|
for (ATermIterator i(list); i; ++i)
|
|
/* It's not an error for *i not to exist. */
|
|
attrs.remove(toATerm(evalStringNoCtx(state, *i)));
|
|
|
|
return makeAttrs(attrs);
|
|
}
|
|
|
|
|
|
/* Determine whether the argument is an attribute set. */
|
|
static Expr prim_isAttrs(EvalState & state, const ATermVector & args)
|
|
{
|
|
ATermList list;
|
|
return makeBool(matchAttrs(evalExpr(state, args[0]), list));
|
|
}
|
|
|
|
|
|
/* Return the right-biased intersection of two attribute sets as1 and
|
|
as2, i.e. a set that contains every attribute from as2 that is also
|
|
a member of as1. */
|
|
static Expr prim_intersectAttrs(EvalState & state, const ATermVector & args)
|
|
{
|
|
ATermMap as1, as2;
|
|
queryAllAttrs(evalExpr(state, args[0]), as1, true);
|
|
queryAllAttrs(evalExpr(state, args[1]), as2, true);
|
|
|
|
ATermMap res;
|
|
foreach (ATermMap::const_iterator, i, as2)
|
|
if (as1[i->key]) res.set(i->key, i->value);
|
|
|
|
return makeAttrs(res);
|
|
}
|
|
|
|
|
|
static void attrsInPattern(ATermMap & map, Pattern pat)
|
|
{
|
|
ATerm name;
|
|
ATermList formals;
|
|
ATermBool ellipsis;
|
|
if (matchAttrsPat(pat, formals, ellipsis, name)) {
|
|
for (ATermIterator i(formals); i; ++i) {
|
|
ATerm def;
|
|
if (!matchFormal(*i, name, def)) abort();
|
|
map.set(name, makeAttrRHS(makeBool(def != constNoDefaultValue), makeNoPos()));
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/* Return a set containing the names of the formal arguments expected
|
|
by the function `f'. The value of each attribute is a Boolean
|
|
denoting whether has a default value. For instance,
|
|
|
|
functionArgs ({ x, y ? 123}: ...)
|
|
=> { x = false; y = true; }
|
|
|
|
"Formal argument" here refers to the attributes pattern-matched by
|
|
the function. Plain lambdas are not included, e.g.
|
|
|
|
functionArgs (x: ...)
|
|
=> { }
|
|
*/
|
|
static Expr prim_functionArgs(EvalState & state, const ATermVector & args)
|
|
{
|
|
Expr f = evalExpr(state, args[0]);
|
|
ATerm pat, body, pos;
|
|
if (!matchFunction(f, pat, body, pos))
|
|
throw TypeError("`functionArgs' required a function");
|
|
|
|
ATermMap as;
|
|
attrsInPattern(as, pat);
|
|
|
|
return makeAttrs(as);
|
|
}
|
|
|
|
|
|
/*************************************************************
|
|
* Lists
|
|
*************************************************************/
|
|
|
|
|
|
/* Determine whether the argument is a list. */
|
|
static Expr prim_isList(EvalState & state, const ATermVector & args)
|
|
{
|
|
ATermList list;
|
|
return makeBool(matchList(evalExpr(state, args[0]), list));
|
|
}
|
|
|
|
|
|
/* Return the first element of a list. */
|
|
static Expr prim_head(EvalState & state, const ATermVector & args)
|
|
{
|
|
ATermList list = evalList(state, args[0]);
|
|
if (ATisEmpty(list))
|
|
throw Error("`head' called on an empty list");
|
|
return evalExpr(state, ATgetFirst(list));
|
|
}
|
|
|
|
|
|
/* Return a list consisting of everything but the the first element of
|
|
a list. */
|
|
static Expr prim_tail(EvalState & state, const ATermVector & args)
|
|
{
|
|
ATermList list = evalList(state, args[0]);
|
|
if (ATisEmpty(list))
|
|
throw Error("`tail' called on an empty list");
|
|
return makeList(ATgetNext(list));
|
|
}
|
|
|
|
|
|
/* Apply a function to every element of a list. */
|
|
static Expr prim_map(EvalState & state, const ATermVector & args)
|
|
{
|
|
Expr fun = evalExpr(state, args[0]);
|
|
ATermList list = evalList(state, args[1]);
|
|
|
|
ATermList res = ATempty;
|
|
for (ATermIterator i(list); i; ++i)
|
|
res = ATinsert(res, makeCall(fun, *i));
|
|
|
|
return makeList(ATreverse(res));
|
|
}
|
|
|
|
|
|
/* Return the length of a list. This is an O(1) time operation. */
|
|
static Expr prim_length(EvalState & state, const ATermVector & args)
|
|
{
|
|
ATermList list = evalList(state, args[0]);
|
|
return makeInt(ATgetLength(list));
|
|
}
|
|
|
|
|
|
/*************************************************************
|
|
* Integer arithmetic
|
|
*************************************************************/
|
|
|
|
|
|
static Expr prim_add(EvalState & state, const ATermVector & args)
|
|
{
|
|
int i1 = evalInt(state, args[0]);
|
|
int i2 = evalInt(state, args[1]);
|
|
return makeInt(i1 + i2);
|
|
}
|
|
|
|
|
|
static Expr prim_sub(EvalState & state, const ATermVector & args)
|
|
{
|
|
int i1 = evalInt(state, args[0]);
|
|
int i2 = evalInt(state, args[1]);
|
|
return makeInt(i1 - i2);
|
|
}
|
|
|
|
|
|
static Expr prim_mul(EvalState & state, const ATermVector & args)
|
|
{
|
|
int i1 = evalInt(state, args[0]);
|
|
int i2 = evalInt(state, args[1]);
|
|
return makeInt(i1 * i2);
|
|
}
|
|
|
|
|
|
static Expr prim_div(EvalState & state, const ATermVector & args)
|
|
{
|
|
int i1 = evalInt(state, args[0]);
|
|
int i2 = evalInt(state, args[1]);
|
|
if (i2 == 0) throw EvalError("division by zero");
|
|
return makeInt(i1 / i2);
|
|
}
|
|
|
|
|
|
static Expr prim_lessThan(EvalState & state, const ATermVector & args)
|
|
{
|
|
int i1 = evalInt(state, args[0]);
|
|
int i2 = evalInt(state, args[1]);
|
|
return makeBool(i1 < i2);
|
|
}
|
|
|
|
|
|
/*************************************************************
|
|
* String manipulation
|
|
*************************************************************/
|
|
|
|
|
|
/* Convert the argument to a string. Paths are *not* copied to the
|
|
store, so `toString /foo/bar' yields `"/foo/bar"', not
|
|
`"/nix/store/whatever..."'. */
|
|
static Expr prim_toString(EvalState & state, const ATermVector & args)
|
|
{
|
|
PathSet context;
|
|
string s = coerceToString(state, args[0], context, true, false);
|
|
return makeStr(s, context);
|
|
}
|
|
|
|
|
|
/* `substring start len str' returns the substring of `str' starting
|
|
at character position `min(start, stringLength str)' inclusive and
|
|
ending at `min(start + len, stringLength str)'. `start' must be
|
|
non-negative. */
|
|
static Expr prim_substring(EvalState & state, const ATermVector & args)
|
|
{
|
|
int start = evalInt(state, args[0]);
|
|
int len = evalInt(state, args[1]);
|
|
PathSet context;
|
|
string s = coerceToString(state, args[2], context);
|
|
|
|
if (start < 0) throw EvalError("negative start position in `substring'");
|
|
|
|
return makeStr(string(s, start, len), context);
|
|
}
|
|
|
|
|
|
static Expr prim_stringLength(EvalState & state, const ATermVector & args)
|
|
{
|
|
PathSet context;
|
|
string s = coerceToString(state, args[0], context);
|
|
return makeInt(s.size());
|
|
}
|
|
|
|
|
|
static Expr prim_unsafeDiscardStringContext(EvalState & state, const ATermVector & args)
|
|
{
|
|
PathSet context;
|
|
string s = coerceToString(state, args[0], context);
|
|
return makeStr(s, PathSet());
|
|
}
|
|
|
|
|
|
/* Sometimes we want to pass a derivation path (i.e. pkg.drvPath) to a
|
|
builder without causing the derivation to be built (for instance,
|
|
in the derivation that builds NARs in nix-push, when doing
|
|
source-only deployment). This primop marks the string context so
|
|
that builtins.derivation adds the path to drv.inputSrcs rather than
|
|
drv.inputDrvs. */
|
|
static Expr prim_unsafeDiscardOutputDependency(EvalState & state, const ATermVector & args)
|
|
{
|
|
PathSet context;
|
|
string s = coerceToString(state, args[0], context);
|
|
|
|
PathSet context2;
|
|
foreach (PathSet::iterator, i, context) {
|
|
Path p = *i;
|
|
if (p.at(0) == '=') p = "~" + string(p, 1);
|
|
context2.insert(p);
|
|
}
|
|
|
|
return makeStr(s, context2);
|
|
}
|
|
|
|
|
|
/* Expression serialization/deserialization */
|
|
|
|
|
|
static Expr prim_exprToString(EvalState & state, const ATermVector & args)
|
|
{
|
|
/* !!! this disregards context */
|
|
return makeStr(atPrint(evalExpr(state, args[0])));
|
|
}
|
|
|
|
|
|
static Expr prim_stringToExpr(EvalState & state, const ATermVector & args)
|
|
{
|
|
/* !!! this can introduce arbitrary garbage terms in the
|
|
evaluator! */;
|
|
string s;
|
|
PathSet l;
|
|
if (!matchStr(evalExpr(state, args[0]), s, l))
|
|
throw EvalError("stringToExpr needs string argument!");
|
|
return ATreadFromString(s.c_str());
|
|
}
|
|
|
|
|
|
/*************************************************************
|
|
* Versions
|
|
*************************************************************/
|
|
|
|
|
|
static Expr prim_parseDrvName(EvalState & state, const ATermVector & args)
|
|
{
|
|
string name = evalStringNoCtx(state, args[0]);
|
|
DrvName parsed(name);
|
|
ATermMap attrs(2);
|
|
attrs.set(toATerm("name"), makeAttrRHS(makeStr(parsed.name), makeNoPos()));
|
|
attrs.set(toATerm("version"), makeAttrRHS(makeStr(parsed.version), makeNoPos()));
|
|
return makeAttrs(attrs);
|
|
}
|
|
|
|
|
|
static Expr prim_compareVersions(EvalState & state, const ATermVector & args)
|
|
{
|
|
string version1 = evalStringNoCtx(state, args[0]);
|
|
string version2 = evalStringNoCtx(state, args[1]);
|
|
int d = compareVersions(version1, version2);
|
|
return makeInt(d);
|
|
}
|
|
|
|
|
|
/*************************************************************
|
|
* Primop registration
|
|
*************************************************************/
|
|
|
|
|
|
void EvalState::addPrimOps()
|
|
{
|
|
addPrimOp("builtins", 0, prim_builtins);
|
|
|
|
// Constants
|
|
addPrimOp("true", 0, prim_true);
|
|
addPrimOp("false", 0, prim_false);
|
|
addPrimOp("null", 0, prim_null);
|
|
addPrimOp("__currentSystem", 0, prim_currentSystem);
|
|
addPrimOp("__currentTime", 0, prim_currentTime);
|
|
|
|
// Miscellaneous
|
|
addPrimOp("import", 1, prim_import);
|
|
addPrimOp("isNull", 1, prim_isNull);
|
|
addPrimOp("__isFunction", 1, prim_isFunction);
|
|
addPrimOp("__isString", 1, prim_isString);
|
|
addPrimOp("__isInt", 1, prim_isInt);
|
|
addPrimOp("__isBool", 1, prim_isBool);
|
|
addPrimOp("__genericClosure", 1, prim_genericClosure);
|
|
addPrimOp("abort", 1, prim_abort);
|
|
addPrimOp("throw", 1, prim_throw);
|
|
addPrimOp("__addErrorContext", 2, prim_addErrorContext);
|
|
addPrimOp("__tryEval", 1, prim_tryEval);
|
|
addPrimOp("__getEnv", 1, prim_getEnv);
|
|
addPrimOp("__trace", 2, prim_trace);
|
|
|
|
|
|
// Expr <-> String
|
|
addPrimOp("__exprToString", 1, prim_exprToString);
|
|
addPrimOp("__stringToExpr", 1, prim_stringToExpr);
|
|
|
|
// Derivations
|
|
addPrimOp("derivation!", 1, prim_derivationStrict);
|
|
addPrimOp("derivation", 1, prim_derivationLazy);
|
|
|
|
// Paths
|
|
addPrimOp("__toPath", 1, prim_toPath);
|
|
addPrimOp("__storePath", 1, prim_storePath);
|
|
addPrimOp("__pathExists", 1, prim_pathExists);
|
|
addPrimOp("baseNameOf", 1, prim_baseNameOf);
|
|
addPrimOp("dirOf", 1, prim_dirOf);
|
|
addPrimOp("__readFile", 1, prim_readFile);
|
|
|
|
// Creating files
|
|
addPrimOp("__toXML", 1, prim_toXML);
|
|
addPrimOp("__toFile", 2, prim_toFile);
|
|
addPrimOp("__filterSource", 2, prim_filterSource);
|
|
|
|
// Attribute sets
|
|
addPrimOp("__attrNames", 1, prim_attrNames);
|
|
addPrimOp("__getAttr", 2, prim_getAttr);
|
|
addPrimOp("__hasAttr", 2, prim_hasAttr);
|
|
addPrimOp("__isAttrs", 1, prim_isAttrs);
|
|
addPrimOp("removeAttrs", 2, prim_removeAttrs);
|
|
addPrimOp("__listToAttrs", 1, prim_listToAttrs);
|
|
addPrimOp("__intersectAttrs", 2, prim_intersectAttrs);
|
|
addPrimOp("__functionArgs", 1, prim_functionArgs);
|
|
|
|
// Lists
|
|
addPrimOp("__isList", 1, prim_isList);
|
|
addPrimOp("__head", 1, prim_head);
|
|
addPrimOp("__tail", 1, prim_tail);
|
|
addPrimOp("map", 2, prim_map);
|
|
addPrimOp("__length", 1, prim_length);
|
|
|
|
// Integer arithmetic
|
|
addPrimOp("__add", 2, prim_add);
|
|
addPrimOp("__sub", 2, prim_sub);
|
|
addPrimOp("__mul", 2, prim_mul);
|
|
addPrimOp("__div", 2, prim_div);
|
|
addPrimOp("__lessThan", 2, prim_lessThan);
|
|
|
|
// String manipulation
|
|
addPrimOp("toString", 1, prim_toString);
|
|
addPrimOp("__substring", 3, prim_substring);
|
|
addPrimOp("__stringLength", 1, prim_stringLength);
|
|
addPrimOp("__unsafeDiscardStringContext", 1, prim_unsafeDiscardStringContext);
|
|
addPrimOp("__unsafeDiscardOutputDependency", 1, prim_unsafeDiscardOutputDependency);
|
|
|
|
// Versions
|
|
addPrimOp("__parseDrvName", 1, prim_parseDrvName);
|
|
addPrimOp("__compareVersions", 2, prim_compareVersions);
|
|
}
|
|
|
|
|
|
}
|