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Forward the experimental features to the nix repl subprocesses

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Pass the current experimental features using `NIX_CONFIG` to the various
Nix subprocesses that `nix repl` invokes.

This is quite a hack, but having `nix repl` call Nix with a subprocess
is a hack already, so I guess that’s fine.
This commit is contained in:
regnat 2021-06-29 14:52:46 +02:00
parent 81535022dc
commit 7daf0c6ef1
1 changed files with 24 additions and 4 deletions
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28
src/nix/repl.cc
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@ -104,6 +104,26 @@ NixRepl::~NixRepl()
write_history(historyFile.c_str());
}
string runNix(Path program, const Strings & args,
const std::optional<std::string> & input = {})
{
auto experimentalFeatures = concatStringsSep(" ", settings.experimentalFeatures.get());
auto nixConf = getEnv("NIX_CONFIG").value_or("");
nixConf.append("\nexperimental-features = " + experimentalFeatures);
auto subprocessEnv = getEnv();
subprocessEnv["NIX_CONFIG"] = nixConf;
RunOptions opts(settings.nixBinDir+ "/" + program, args);
opts.input = input;
opts.environment = subprocessEnv;
auto res = runProgram(opts);
if (!statusOk(res.first))
throw ExecError(res.first, fmt("program '%1%' %2%", program, statusToString(res.first)));
return res.second;
}
static NixRepl * curRepl; // ugly
static char * completionCallback(char * s, int *match) {
@ -463,7 +483,7 @@ bool NixRepl::processLine(string line)
state->callFunction(f, v, result, Pos());
StorePath drvPath = getDerivationPath(result);
runProgram(settings.nixBinDir + "/nix-shell", true, {state->store->printStorePath(drvPath)});
runNix("nix-shell", {state->store->printStorePath(drvPath)});
}
else if (command == ":b" || command == ":i" || command == ":s") {
@ -477,7 +497,7 @@ bool NixRepl::processLine(string line)
but doing it in a child makes it easier to recover from
problems / SIGINT. */
try {
runProgram(settings.nixBinDir + "/nix", true, {"build", "--no-link", drvPathRaw});
runNix("nix", {"build", "--no-link", drvPathRaw});
auto drv = state->store->readDerivation(drvPath);
std::cout << std::endl << "this derivation produced the following outputs:" << std::endl;
for (auto & i : drv.outputsAndOptPaths(*state->store))
@ -485,9 +505,9 @@ bool NixRepl::processLine(string line)
} catch (ExecError &) {
}
} else if (command == ":i") {
runProgram(settings.nixBinDir + "/nix-env", true, {"-i", drvPathRaw});
runNix("nix-env", {"-i", drvPathRaw});
} else {
runProgram(settings.nixBinDir + "/nix-shell", true, {drvPathRaw});
runNix("nix-shell", {drvPathRaw});
}
}