080654aaf9
This allows peeking of the type at a given path. It's necessary, as an open() might not fail until you try to read() from it, and generally, stat'ing can be faster in some cases. Change-Id: Ib002da3194a3546ca286de49aac8d1022ec5560f Reviewed-on: https://cl.tvl.fyi/c/depot/+/11871 Tested-by: BuildkiteCI Reviewed-by: Ilan Joselevich <personal@ilanjoselevich.com> Reviewed-by: Connor Brewster <cbrewster@hey.com>
70 lines
2.1 KiB
Rust
70 lines
2.1 KiB
Rust
//! This module implements a wrapper around tvix-eval's [EvalIO] type,
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//! adding functionality which is required by tvix-cli:
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//!
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//! 1. Marking plain paths known to the reference scanner.
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//! 2. Handling the C++ Nix `__corepkgs__`-hack for nixpkgs bootstrapping.
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//!
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//! All uses of [EvalIO] in tvix-cli must make use of this wrapper,
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//! otherwise fundamental features like nixpkgs bootstrapping and hash
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//! calculation will not work.
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use std::io::{self, Cursor};
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use std::path::{Path, PathBuf};
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use tvix_eval::{EvalIO, FileType};
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// TODO: Merge this together with TvixStoreIO?
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pub struct TvixIO<T> {
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// Actual underlying [EvalIO] implementation.
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actual: T,
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}
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impl<T> TvixIO<T> {
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pub fn new(actual: T) -> Self {
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Self { actual }
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}
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}
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impl<T> EvalIO for TvixIO<T>
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where
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T: AsRef<dyn EvalIO>,
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{
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fn store_dir(&self) -> Option<String> {
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self.actual.as_ref().store_dir()
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}
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fn import_path(&self, path: &Path) -> io::Result<PathBuf> {
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self.actual.as_ref().import_path(path)
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}
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fn path_exists(&self, path: &Path) -> io::Result<bool> {
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if path.starts_with("/__corepkgs__") {
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return Ok(true);
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}
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self.actual.as_ref().path_exists(path)
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}
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fn open(&self, path: &Path) -> io::Result<Box<dyn io::Read>> {
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// Bundled version of corepkgs/fetchurl.nix. The counterpart
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// of this happens in [crate::configure_nix_path], where the `nix_path`
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// of the evaluation has `nix=/__corepkgs__` added to it.
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//
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// This workaround is similar to what cppnix does for passing
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// the path through.
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//
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// TODO: this comparison is bad we should use the sane path library.
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if path.starts_with("/__corepkgs__/fetchurl.nix") {
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return Ok(Box::new(Cursor::new(include_bytes!("fetchurl.nix"))));
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}
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self.actual.as_ref().open(path)
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}
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fn file_type(&self, path: &Path) -> io::Result<FileType> {
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self.actual.as_ref().file_type(path)
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}
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fn read_dir(&self, path: &Path) -> io::Result<Vec<(bytes::Bytes, FileType)>> {
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self.actual.as_ref().read_dir(path)
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}
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}
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