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Split OptionalPathSetting from PathSetting

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Rather than doing `allowEmpty` as boolean, have separate types and use
`std::optional`. This makes it harder to forget the possibility of an
empty path.

The `build-hook` setting was categorized as a `PathSetting`, but
actually it was split into arguments. No good! Now, it is
`Setting<Strings>` which actually reflects what it means and how it is
used.

Because of the subtyping, we now also have support for
`Setting<std::optional<String>>` in general. I imagine this can be used
to clean up many more settings also.
This commit is contained in:
John Ericson 2023-05-19 10:56:59 -04:00
parent c8825e9d8c
commit d2ce2e89b1
10 changed files with 134 additions and 63 deletions
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6
src/libstore/build/hook-instance.cc
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@ -5,14 +5,14 @@ namespace nix {
HookInstance::HookInstance()
{
debug("starting build hook '%s'", settings.buildHook);
debug("starting build hook '%s'", concatStringsSep(" ", settings.buildHook.get()));
auto buildHookArgs = tokenizeString<std::list<std::string>>(settings.buildHook.get());
auto buildHookArgs = settings.buildHook.get();
if (buildHookArgs.empty())
throw Error("'build-hook' setting is empty");
auto buildHook = buildHookArgs.front();
auto buildHook = canonPath(buildHookArgs.front());
buildHookArgs.pop_front();
Strings args;