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//! This module implements a wrapper around tvix-eval's [EvalIO] type,
//! adding functionality which is required by tvix-cli:
//!
//! 1. Marking plain paths known to the reference scanner.
//! 2. Handling the C++ Nix `__corepkgs__`-hack for nixpkgs bootstrapping.
//!
//! All uses of [EvalIO] in tvix-cli must make use of this wrapper,
//! otherwise fundamental features like nixpkgs bootstrapping and hash
//! calculation will not work.
use std::io::{self, Cursor};
use std::path::{Path, PathBuf};
use tvix_eval::{EvalIO, FileType};
// TODO: Merge this together with TvixStoreIO?
pub struct TvixIO<T> {
// Actual underlying [EvalIO] implementation.
actual: T,
}
impl<T> TvixIO<T> {
pub fn new(actual: T) -> Self {
Self { actual }
}
}
impl<T> EvalIO for TvixIO<T>
where
T: AsRef<dyn EvalIO>,
{
fn store_dir(&self) -> Option<String> {
self.actual.as_ref().store_dir()
}
fn import_path(&self, path: &Path) -> io::Result<PathBuf> {
self.actual.as_ref().import_path(path)
}
fn path_exists(&self, path: &Path) -> io::Result<bool> {
if path.starts_with("/__corepkgs__") {
return Ok(true);
}
self.actual.as_ref().path_exists(path)
}
fn open(&self, path: &Path) -> io::Result<Box<dyn io::Read>> {
// Bundled version of corepkgs/fetchurl.nix. The counterpart
// of this happens in [crate::configure_nix_path], where the `nix_path`
// of the evaluation has `nix=/__corepkgs__` added to it.
//
// This workaround is similar to what cppnix does for passing
// the path through.
//
// TODO: this comparison is bad we should use the sane path library.
if path.starts_with("/__corepkgs__/fetchurl.nix") {
return Ok(Box::new(Cursor::new(include_bytes!("fetchurl.nix"))));
}
self.actual.as_ref().open(path)
}
fn file_type(&self, path: &Path) -> io::Result<FileType> {
self.actual.as_ref().file_type(path)
}
fn read_dir(&self, path: &Path) -> io::Result<Vec<(bytes::Bytes, FileType)>> {
self.actual.as_ref().read_dir(path)
}
}
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