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* New primop "throw <string>" to throw an error. This is like abort,

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only thrown errors are caught by the top-level derivation evaluation
  in nix-env -qa / -i.
This commit is contained in:
Eelco Dolstra 2007-04-16 15:03:19 +00:00
parent 0a8eeea9d8
commit 5f2492eaec
3 changed files with 13 additions and 0 deletions
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9
src/libexpr/primops.cc
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@ -269,6 +269,14 @@ static Expr prim_abort(EvalState & state, const ATermVector & args)
}
static Expr prim_throw(EvalState & state, const ATermVector & args)
{
PathSet context;
throw ThrownError(format("user-thrown exception: `%1%'") %
evalString(state, args[0], context));
}
/* Return an environment variable. Use with care. */
static Expr prim_getEnv(EvalState & state, const ATermVector & args)
{
@ -878,6 +886,7 @@ void EvalState::addPrimOps()
addPrimOp("isNull", 1, prim_isNull);
addPrimOp("dependencyClosure", 1, prim_dependencyClosure);
addPrimOp("abort", 1, prim_abort);
addPrimOp("throw", 1, prim_throw);
addPrimOp("__getEnv", 1, prim_getEnv);
addPrimOp("relativise", 2, prim_relativise);