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authorShea Levy <shea@shealevy.com>2014-06-01T14·42-0400
committerShea Levy <shea@shealevy.com>2014-06-17T16·08-0400
commit5cd022d6c099c583c0494bdacd06f4eb32661135 (patch)
treedee973d2ba3f9c07cdffc15951483fa359450490 /src/nix-store
parent9d0709e8c47082cec35d6412053eacfadae23bcd (diff)
Add importNative primop
This can be used to import a dynamic shared object and return an
arbitrary value, including new primops. This can be used both to test
new primops without having to recompile nix every time, and to build
specialized primops that probably don't belong upstream (e.g. a function
that calls out to gpg to decrypt a nixops secret as-needed).

The imported function should initialize the Value & as needed. A single
import can define multiple values by creating an attrset or list, of
course.

An example initialization function might look like:

extern "C" void initialize(nix::EvalState & state, nix::Value & v)
{
    v.type = nix::tPrimOp;
    v.primOp = NEW nix::PrimOp(myFun, 1, state.symbols.create("myFun"));
}

Then `builtins.importNative ./example.so "initialize"` will evaluate to
the primop defined in the myFun function.
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