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Add inNixShell = true to nix-shell auto-call

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This is an alternative to the IN_NIX_SHELL environment variable,
allowing the expression to adapt itself to nix-shell without
triggering those adaptations when used as a dependency of another
shell.

Closes #3147
This commit is contained in:
Robert Hensing 2019-10-27 09:34:33 +01:00
parent 2f96a89646
commit 9d612c393a
3 changed files with 21 additions and 6 deletions
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16
src/nix-build/nix-build.cc
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@ -245,7 +245,21 @@ static void _main(int argc, char * * argv)
auto state = std::make_unique<EvalState>(myArgs.searchPath, store);
state->repair = repair;
Bindings & autoArgs = *myArgs.getAutoArgs(*state);
Bindings & autoArgs = *[&](){
Bindings *userAutoArgs = myArgs.getAutoArgs(*state);
if (runEnv) {
Bindings * res = state->allocBindings(userAutoArgs->size() + 1);
Value * tru = state->allocValue();
mkBool(*tru, true);
res->push_back(Attr(state->symbols.create("inNixShell"), tru));
for (auto & i : *userAutoArgs) {
res->push_back(i);
}
res->sort();
return res;
}
else return userAutoArgs;
}();
if (packages) {
std::ostringstream joined;