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Add hasContext primop

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This commit is contained in:
Shea Levy 2018-01-02 12:22:52 -05:00
parent f68c2b5a78
commit 689b2783fc
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1 changed files with 9 additions and 0 deletions
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9
src/libexpr/primops.cc
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@ -1653,6 +1653,14 @@ static void prim_unsafeDiscardStringContext(EvalState & state, const Pos & pos,
}
static void prim_hasContext(EvalState & state, const Pos & pos, Value * * args, Value & v)
{
PathSet context;
state.forceString(*args[0], context, pos);
mkBool(v, !context.empty());
}
/* 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
@ -2083,6 +2091,7 @@ void EvalState::createBaseEnv()
addPrimOp("toString", 1, prim_toString);
addPrimOp("__substring", 3, prim_substring);
addPrimOp("__stringLength", 1, prim_stringLength);
addPrimOp("__hasContext", 1, prim_hasContext);
addPrimOp("__unsafeDiscardStringContext", 1, prim_unsafeDiscardStringContext);
addPrimOp("__unsafeDiscardOutputDependency", 1, prim_unsafeDiscardOutputDependency);
addPrimOp("__hashString", 2, prim_hashString);