This removes all the intermediate helper functions and reorganizes the import code to only do the calculations where/when needed, and hopefully makes things easier to understand as well. Change-Id: I7e4c89c742bf8569b45e303523f7f801da7127ea Reviewed-on: https://cl.tvl.fyi/c/depot/+/12627 Autosubmit: flokli <flokli@flokli.de> Tested-by: BuildkiteCI Reviewed-by: Jörg Thalheim <joerg@thalheim.io> Reviewed-by: edef <edef@edef.eu>
697 lines
31 KiB
Rust
697 lines
31 KiB
Rust
//! This module provides an implementation of EvalIO talking to tvix-store.
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use bytes::Bytes;
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use futures::{StreamExt, TryStreamExt};
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use nix_compat::{nixhash::CAHash, store_path::StorePath};
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use std::collections::BTreeMap;
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use std::{
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cell::RefCell,
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io,
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path::{Path, PathBuf},
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sync::Arc,
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};
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use tokio_util::io::SyncIoBridge;
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use tracing::{error, instrument, warn, Level, Span};
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use tracing_indicatif::span_ext::IndicatifSpanExt;
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use tvix_build::buildservice::BuildService;
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use tvix_eval::{EvalIO, FileType, StdIO};
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use tvix_store::nar::NarCalculationService;
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use tvix_castore::{
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blobservice::BlobService,
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directoryservice::{self, DirectoryService},
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Node,
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};
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use tvix_store::pathinfoservice::{PathInfo, PathInfoService};
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use crate::fetchers::Fetcher;
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use crate::known_paths::KnownPaths;
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use crate::tvix_build::derivation_to_build_request;
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/// Implements [EvalIO], asking given [PathInfoService], [DirectoryService]
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/// and [BlobService].
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///
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/// In case the given path does not exist in these stores, we ask StdIO.
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/// This is to both cover cases of syntactically valid store paths, that exist
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/// on the filesystem (still managed by Nix), as well as being able to read
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/// files outside store paths.
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///
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/// This structure is also directly used by the derivation builtins
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/// and tightly coupled to it.
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///
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/// In the future, we may revisit that coupling and figure out how to generalize this interface and
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/// hide this implementation detail of the glue itself so that glue can be used with more than one
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/// implementation of "Tvix Store IO" which does not necessarily bring the concept of blob service,
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/// directory service or path info service.
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pub struct TvixStoreIO {
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// This is public so helper functions can interact with the stores directly.
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pub(crate) blob_service: Arc<dyn BlobService>,
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pub(crate) directory_service: Arc<dyn DirectoryService>,
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pub(crate) path_info_service: Arc<dyn PathInfoService>,
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pub(crate) nar_calculation_service: Arc<dyn NarCalculationService>,
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std_io: StdIO,
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#[allow(dead_code)]
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build_service: Arc<dyn BuildService>,
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pub(crate) tokio_handle: tokio::runtime::Handle,
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#[allow(clippy::type_complexity)]
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pub(crate) fetcher: Fetcher<
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Arc<dyn BlobService>,
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Arc<dyn DirectoryService>,
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Arc<dyn PathInfoService>,
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Arc<dyn NarCalculationService>,
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>,
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// Paths known how to produce, by building or fetching.
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pub known_paths: RefCell<KnownPaths>,
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}
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impl TvixStoreIO {
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pub fn new(
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blob_service: Arc<dyn BlobService>,
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directory_service: Arc<dyn DirectoryService>,
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path_info_service: Arc<dyn PathInfoService>,
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nar_calculation_service: Arc<dyn NarCalculationService>,
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build_service: Arc<dyn BuildService>,
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tokio_handle: tokio::runtime::Handle,
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) -> Self {
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Self {
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blob_service: blob_service.clone(),
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directory_service: directory_service.clone(),
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path_info_service: path_info_service.clone(),
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nar_calculation_service: nar_calculation_service.clone(),
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std_io: StdIO {},
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build_service,
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tokio_handle,
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fetcher: Fetcher::new(
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blob_service,
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directory_service,
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path_info_service,
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nar_calculation_service,
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),
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known_paths: Default::default(),
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}
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}
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/// for a given [StorePath] and additional [Path] inside the store path,
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/// look up the [PathInfo], and if it exists, and then use
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/// [directoryservice::descend_to] to return the
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/// [Node] specified by `sub_path`.
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///
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/// In case there is no PathInfo yet, this means we need to build it
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/// (which currently is stubbed out still).
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#[instrument(skip(self, store_path), fields(store_path=%store_path, indicatif.pb_show=1), ret(level = Level::TRACE), err)]
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async fn store_path_to_node(
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&self,
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store_path: &StorePath<String>,
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sub_path: &Path,
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) -> io::Result<Option<Node>> {
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// Find the root node for the store_path.
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// It asks the PathInfoService first, but in case there was a Derivation
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// produced that would build it, fall back to triggering the build.
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// To populate the input nodes, it might recursively trigger builds of
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// its dependencies too.
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let root_node = match self
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.path_info_service
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.as_ref()
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.get(*store_path.digest())
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.await?
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{
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// TODO: use stricter typed BuildRequest here.
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Some(path_info) => path_info.node,
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// If there's no PathInfo found, this normally means we have to
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// trigger the build (and insert into PathInfoService, after
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// reference scanning).
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// However, as Tvix is (currently) not managing /nix/store itself,
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// we return Ok(None) to let std_io take over.
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// While reading from store paths that are not known to Tvix during
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// that evaluation clearly is an impurity, we still need to support
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// it for things like <nixpkgs> pointing to a store path.
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// In the future, these things will (need to) have PathInfo.
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None => {
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// The store path doesn't exist yet, so we need to fetch or build it.
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// We check for fetches first, as we might have both native
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// fetchers and FODs in KnownPaths, and prefer the former.
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// This will also find [Fetch] synthesized from
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// `builtin:fetchurl` Derivations.
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let maybe_fetch = self
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.known_paths
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.borrow()
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.get_fetch_for_output_path(store_path);
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match maybe_fetch {
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Some((name, fetch)) => {
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let (sp, root_node) = self
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.fetcher
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.ingest_and_persist(&name, fetch)
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.await
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.map_err(|e| {
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std::io::Error::new(std::io::ErrorKind::InvalidData, e)
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})?;
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debug_assert_eq!(
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sp.to_absolute_path(),
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store_path.as_ref().to_absolute_path(),
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"store path returned from fetcher must match store path we have in fetchers"
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);
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root_node
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}
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None => {
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// Look up the derivation for this output path.
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let (drv_path, drv) = {
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let known_paths = self.known_paths.borrow();
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match known_paths.get_drv_path_for_output_path(store_path) {
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Some(drv_path) => (
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drv_path.to_owned(),
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known_paths.get_drv_by_drvpath(drv_path).unwrap().to_owned(),
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),
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None => {
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warn!(store_path=%store_path, "no drv found");
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// let StdIO take over
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return Ok(None);
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}
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}
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};
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let span = Span::current();
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span.pb_start();
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span.pb_set_style(&tvix_tracing::PB_SPINNER_STYLE);
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span.pb_set_message(&format!("⏳Waiting for inputs {}", &store_path));
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// derivation_to_build_request needs castore nodes for all inputs.
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// Provide them, which means, here is where we recursively build
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// all dependencies.
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let mut inputs: BTreeMap<Bytes, Node> =
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futures::stream::iter(drv.input_derivations.iter())
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.map(|(input_drv_path, output_names)| {
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// look up the derivation object
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let input_drv = {
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let known_paths = self.known_paths.borrow();
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known_paths
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.get_drv_by_drvpath(input_drv_path)
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.unwrap_or_else(|| {
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panic!("{} not found", input_drv_path)
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})
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.to_owned()
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};
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// convert output names to actual paths
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let output_paths: Vec<StorePath<String>> = output_names
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.iter()
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.map(|output_name| {
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input_drv
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.outputs
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.get(output_name)
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.expect("missing output_name")
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.path
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.as_ref()
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.expect("missing output path")
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.clone()
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})
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.collect();
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// For each output, ask for the castore node.
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// We're in a per-derivation context, so if they're
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// not built yet they'll all get built together.
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// If they don't need to build, we can however still
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// substitute all in parallel (if they don't need to
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// be built) - so we turn this into a stream of streams.
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// It's up to the builder to deduplicate same build requests.
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futures::stream::iter(output_paths.into_iter()).map(
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|output_path| async move {
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let node = self
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.store_path_to_node(&output_path, Path::new(""))
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.await?;
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if let Some(node) = node {
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Ok((output_path.to_string().into(), node))
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} else {
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Err(io::Error::other("no node produced"))
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}
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},
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)
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})
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.flatten()
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.buffer_unordered(
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1, /* TODO: increase again once we prevent redundant fetches */
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) // TODO: make configurable
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.try_collect()
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.await?;
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// FUTUREWORK: merge these who things together
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// add input sources
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let input_sources: BTreeMap<_, _> =
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futures::stream::iter(drv.input_sources.iter())
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.then(|input_source| {
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Box::pin({
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let input_source = input_source.clone();
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async move {
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let node = self
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.store_path_to_node(&input_source, Path::new(""))
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.await?;
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if let Some(node) = node {
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Ok((input_source.to_string().into(), node))
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} else {
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Err(io::Error::other("no node produced"))
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}
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}
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})
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})
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.try_collect()
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.await?;
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inputs.extend(input_sources);
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span.pb_set_message(&format!("🔨Building {}", &store_path));
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// TODO: check if input sources are sufficiently dealth with,
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// I think yes, they must be imported into the store by other
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// operations, so dealt with in the Some(…) match arm
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// synthesize the build request.
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let build_request = derivation_to_build_request(&drv, inputs)?;
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// create a build
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let build_result = self
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.build_service
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.as_ref()
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.do_build(build_request)
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.await
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.map_err(|e| std::io::Error::new(io::ErrorKind::Other, e))?;
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// Maps from the index in refscan_needles to the full store path
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// Used to map back to the actual store path from the found needles
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// Importantly, this must match the order of the needles generated in derivation_to_build_request
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let refscan_needles =
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crate::tvix_build::get_refscan_needles(&drv).collect::<Vec<_>>();
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// For each output, insert a PathInfo.
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for ((output, output_needles), drv_output) in build_result
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.outputs
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.iter()
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.zip(build_result.outputs_needles.iter())
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.zip(drv.outputs.iter())
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{
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let (_, output_node) = output
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.clone()
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.into_name_bytes_and_node()
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.expect("invalid node");
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let output_needles: Vec<_> = output_needles
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.needles
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.iter()
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// Map each output needle index back to the refscan_needle
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.map(|idx| {
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refscan_needles
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.get(*idx as usize)
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.ok_or(std::io::Error::new(
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std::io::ErrorKind::Other,
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"invalid build response",
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))
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})
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.collect::<Result<_, std::io::Error>>()?;
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// calculate the nar representation
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let (nar_size, nar_sha256) = self
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.nar_calculation_service
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.calculate_nar(&output_node)
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.await?;
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// assemble the PathInfo to persist
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let path_info = PathInfo {
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store_path: drv_output
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.1
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.path
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.as_ref()
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.ok_or(std::io::Error::new(
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std::io::ErrorKind::Other,
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"Tvix bug: missing output store path",
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))?
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.to_owned(),
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node: output_node,
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references: output_needles
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.iter()
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.map(|s| (**s).to_owned())
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.collect(),
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nar_size,
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nar_sha256,
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signatures: vec![],
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deriver: Some(
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StorePath::from_name_and_digest_fixed(
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drv_path
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.name()
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.strip_suffix(".drv")
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.expect("missing .drv suffix"),
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*drv_path.digest(),
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)
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.expect(
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"Tvix bug: StorePath without .drv suffix must be valid",
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),
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),
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ca: drv.fod_digest().map(|fod_digest| {
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CAHash::Nar(nix_compat::nixhash::NixHash::Sha256(fod_digest))
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}),
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};
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self.path_info_service
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.put(path_info)
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.await
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.map_err(|e| std::io::Error::new(io::ErrorKind::Other, e))?;
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}
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// find the output for the store path requested
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let s = store_path.to_string();
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build_result
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.outputs
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.into_iter()
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.map(|e| e.into_name_and_node().expect("invalid node"))
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.find(|(output_name, _output_node)| {
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output_name.as_ref() == s.as_bytes()
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})
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.expect("build didn't produce the store path")
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.1
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}
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}
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}
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};
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// now with the root_node and sub_path, descend to the node requested.
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// We convert sub_path to the castore model here.
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let sub_path = tvix_castore::PathBuf::from_host_path(sub_path, true)?;
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directoryservice::descend_to(&self.directory_service, root_node, sub_path)
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.await
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.map_err(|e| std::io::Error::new(io::ErrorKind::Other, e))
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}
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}
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impl EvalIO for TvixStoreIO {
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#[instrument(skip(self), ret(level = Level::TRACE), err)]
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fn path_exists(&self, path: &Path) -> io::Result<bool> {
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if let Ok((store_path, sub_path)) = StorePath::from_absolute_path_full(path) {
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if self
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.tokio_handle
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.block_on(self.store_path_to_node(&store_path, sub_path))?
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.is_some()
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{
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Ok(true)
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} else {
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// As tvix-store doesn't manage /nix/store on the filesystem,
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// we still need to also ask self.std_io here.
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self.std_io.path_exists(path)
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}
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} else {
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// The store path is no store path, so do regular StdIO.
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self.std_io.path_exists(path)
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}
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}
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#[instrument(skip(self), err)]
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fn open(&self, path: &Path) -> io::Result<Box<dyn io::Read>> {
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if let Ok((store_path, sub_path)) = StorePath::from_absolute_path_full(path) {
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if let Some(node) = self
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.tokio_handle
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.block_on(async { self.store_path_to_node(&store_path, sub_path).await })?
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{
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// depending on the node type, treat open differently
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match node {
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Node::Directory { .. } => {
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// This would normally be a io::ErrorKind::IsADirectory (still unstable)
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Err(io::Error::new(
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io::ErrorKind::Unsupported,
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format!("tried to open directory at {:?}", path),
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))
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}
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Node::File { digest, .. } => {
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self.tokio_handle.block_on(async {
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let resp = self.blob_service.as_ref().open_read(&digest).await?;
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match resp {
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Some(blob_reader) => {
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// The VM Response needs a sync [std::io::Reader].
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Ok(Box::new(SyncIoBridge::new(blob_reader))
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as Box<dyn io::Read>)
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}
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None => {
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error!(
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blob.digest = %digest,
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"blob not found",
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);
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Err(io::Error::new(
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io::ErrorKind::NotFound,
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format!("blob {} not found", &digest),
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))
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}
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}
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})
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}
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Node::Symlink { .. } => Err(io::Error::new(
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io::ErrorKind::Unsupported,
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"open for symlinks is unsupported",
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))?,
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}
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} else {
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// As tvix-store doesn't manage /nix/store on the filesystem,
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// we still need to also ask self.std_io here.
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self.std_io.open(path)
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}
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} else {
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// The store path is no store path, so do regular StdIO.
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self.std_io.open(path)
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}
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}
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#[instrument(skip(self), ret(level = Level::TRACE), err)]
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fn file_type(&self, path: &Path) -> io::Result<FileType> {
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if let Ok((store_path, sub_path)) = StorePath::from_absolute_path_full(path) {
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if let Some(node) = self
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.tokio_handle
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.block_on(async { self.store_path_to_node(&store_path, sub_path).await })?
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{
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match node {
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Node::Directory { .. } => Ok(FileType::Directory),
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Node::File { .. } => Ok(FileType::Regular),
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Node::Symlink { .. } => Ok(FileType::Symlink),
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}
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} else {
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self.std_io.file_type(path)
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}
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} else {
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self.std_io.file_type(path)
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}
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}
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#[instrument(skip(self), ret(level = Level::TRACE), err)]
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fn read_dir(&self, path: &Path) -> io::Result<Vec<(bytes::Bytes, FileType)>> {
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if let Ok((store_path, sub_path)) = StorePath::from_absolute_path_full(path) {
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if let Some(node) = self
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.tokio_handle
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.block_on(async { self.store_path_to_node(&store_path, sub_path).await })?
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{
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match node {
|
|
Node::Directory { digest, .. } => {
|
|
// fetch the Directory itself.
|
|
if let Some(directory) = self.tokio_handle.block_on({
|
|
let digest = digest.clone();
|
|
async move { self.directory_service.as_ref().get(&digest).await }
|
|
})? {
|
|
let mut children: Vec<(bytes::Bytes, FileType)> = Vec::new();
|
|
for (name, node) in directory.into_nodes() {
|
|
children.push(match node {
|
|
Node::Directory { .. } => (name.into(), FileType::Directory),
|
|
Node::File { .. } => (name.clone().into(), FileType::Regular),
|
|
Node::Symlink { .. } => (name.into(), FileType::Symlink),
|
|
})
|
|
}
|
|
Ok(children)
|
|
} else {
|
|
// If we didn't get the directory node that's linked, that's a store inconsistency!
|
|
error!(
|
|
directory.digest = %digest,
|
|
path = ?path,
|
|
"directory not found",
|
|
);
|
|
Err(io::Error::new(
|
|
io::ErrorKind::NotFound,
|
|
format!("directory {digest} does not exist"),
|
|
))?
|
|
}
|
|
}
|
|
Node::File { .. } => {
|
|
// This would normally be a io::ErrorKind::NotADirectory (still unstable)
|
|
Err(io::Error::new(
|
|
io::ErrorKind::Unsupported,
|
|
"tried to readdir path {:?}, which is a file",
|
|
))?
|
|
}
|
|
Node::Symlink { .. } => Err(io::Error::new(
|
|
io::ErrorKind::Unsupported,
|
|
"read_dir for symlinks is unsupported",
|
|
))?,
|
|
}
|
|
} else {
|
|
self.std_io.read_dir(path)
|
|
}
|
|
} else {
|
|
self.std_io.read_dir(path)
|
|
}
|
|
}
|
|
|
|
#[instrument(skip(self), ret(level = Level::TRACE), err)]
|
|
fn import_path(&self, path: &Path) -> io::Result<PathBuf> {
|
|
let path_info = self.tokio_handle.block_on({
|
|
tvix_store::import::import_path_as_nar_ca(
|
|
path,
|
|
tvix_store::import::path_to_name(path)?,
|
|
&self.blob_service,
|
|
&self.directory_service,
|
|
&self.path_info_service,
|
|
&self.nar_calculation_service,
|
|
)
|
|
})?;
|
|
|
|
// From the returned PathInfo, extract the store path and return it.
|
|
Ok(path_info.store_path.to_absolute_path().into())
|
|
}
|
|
|
|
#[instrument(skip(self), ret(level = Level::TRACE))]
|
|
fn store_dir(&self) -> Option<String> {
|
|
Some("/nix/store".to_string())
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use std::{path::Path, rc::Rc, sync::Arc};
|
|
|
|
use bstr::ByteSlice;
|
|
use clap::Parser;
|
|
use tempfile::TempDir;
|
|
use tvix_build::buildservice::DummyBuildService;
|
|
use tvix_eval::{EvalIO, EvaluationResult};
|
|
use tvix_store::utils::{construct_services, ServiceUrlsMemory};
|
|
|
|
use super::TvixStoreIO;
|
|
use crate::builtins::{add_derivation_builtins, add_fetcher_builtins, add_import_builtins};
|
|
|
|
/// evaluates a given nix expression and returns the result.
|
|
/// Takes care of setting up the evaluator so it knows about the
|
|
// `derivation` builtin.
|
|
fn eval(str: &str) -> EvaluationResult {
|
|
let tokio_runtime = tokio::runtime::Runtime::new().unwrap();
|
|
let (blob_service, directory_service, path_info_service, nar_calculation_service) =
|
|
tokio_runtime
|
|
.block_on(async {
|
|
construct_services(ServiceUrlsMemory::parse_from(std::iter::empty::<&str>()))
|
|
.await
|
|
})
|
|
.unwrap();
|
|
|
|
let io = Rc::new(TvixStoreIO::new(
|
|
blob_service,
|
|
directory_service,
|
|
path_info_service,
|
|
nar_calculation_service.into(),
|
|
Arc::<DummyBuildService>::default(),
|
|
tokio_runtime.handle().clone(),
|
|
));
|
|
|
|
let mut eval_builder =
|
|
tvix_eval::Evaluation::builder(io.clone() as Rc<dyn EvalIO>).enable_import();
|
|
eval_builder = add_derivation_builtins(eval_builder, Rc::clone(&io));
|
|
eval_builder = add_fetcher_builtins(eval_builder, Rc::clone(&io));
|
|
eval_builder = add_import_builtins(eval_builder, io);
|
|
let eval = eval_builder.build();
|
|
|
|
// run the evaluation itself.
|
|
eval.evaluate(str, None)
|
|
}
|
|
|
|
/// Helper function that takes a &Path, and invokes a tvix evaluator coercing that path to a string
|
|
/// (via "${/this/path}"). The path can be both absolute or not.
|
|
/// It returns Option<String>, depending on whether the evaluation succeeded or not.
|
|
fn import_path_and_compare<P: AsRef<Path>>(p: P) -> Option<String> {
|
|
// Try to import the path using "${/tmp/path/to/test}".
|
|
// The format string looks funny, the {} passed to Nix needs to be
|
|
// escaped.
|
|
let code = format!(r#""${{{}}}""#, p.as_ref().display());
|
|
let result = eval(&code);
|
|
|
|
if !result.errors.is_empty() {
|
|
return None;
|
|
}
|
|
|
|
let value = result.value.expect("must be some");
|
|
match value {
|
|
tvix_eval::Value::String(s) => Some(s.to_str_lossy().into_owned()),
|
|
_ => panic!("unexpected value type: {:?}", value),
|
|
}
|
|
}
|
|
|
|
/// Import a directory with a zero-sized ".keep" regular file.
|
|
/// Ensure it matches the (pre-recorded) store path that Nix would produce.
|
|
#[test]
|
|
fn import_directory() {
|
|
let tmpdir = TempDir::new().unwrap();
|
|
|
|
// create a directory named "test"
|
|
let src_path = tmpdir.path().join("test");
|
|
std::fs::create_dir(&src_path).unwrap();
|
|
|
|
// write a regular file `.keep`.
|
|
std::fs::write(src_path.join(".keep"), vec![]).unwrap();
|
|
|
|
// importing the path with .../test at the end.
|
|
assert_eq!(
|
|
Some("/nix/store/gq3xcv4xrj4yr64dflyr38acbibv3rm9-test".to_string()),
|
|
import_path_and_compare(&src_path)
|
|
);
|
|
|
|
// importing the path with .../test/. at the end.
|
|
assert_eq!(
|
|
Some("/nix/store/gq3xcv4xrj4yr64dflyr38acbibv3rm9-test".to_string()),
|
|
import_path_and_compare(src_path.join("."))
|
|
);
|
|
}
|
|
|
|
/// Import a file into the store. Nix uses the "recursive"/NAR-based hashing
|
|
/// scheme for these.
|
|
#[test]
|
|
fn import_file() {
|
|
let tmpdir = TempDir::new().unwrap();
|
|
|
|
// write a regular file `empty`.
|
|
std::fs::write(tmpdir.path().join("empty"), vec![]).unwrap();
|
|
|
|
assert_eq!(
|
|
Some("/nix/store/lx5i78a4izwk2qj1nq8rdc07y8zrwy90-empty".to_string()),
|
|
import_path_and_compare(tmpdir.path().join("empty"))
|
|
);
|
|
|
|
// write a regular file `hello.txt`.
|
|
std::fs::write(tmpdir.path().join("hello.txt"), b"Hello World!").unwrap();
|
|
|
|
assert_eq!(
|
|
Some("/nix/store/925f1jb1ajrypjbyq7rylwryqwizvhp0-hello.txt".to_string()),
|
|
import_path_and_compare(tmpdir.path().join("hello.txt"))
|
|
);
|
|
}
|
|
|
|
/// Invoke toString on a nonexisting file, and access the .file attribute.
|
|
/// This should not cause an error, because it shouldn't trigger an import,
|
|
/// and leave the path as-is.
|
|
#[test]
|
|
fn nonexisting_path_without_import() {
|
|
let result = eval("toString ({ line = 42; col = 42; file = /deep/thought; }.file)");
|
|
|
|
assert!(result.errors.is_empty(), "expect evaluation to succeed");
|
|
let value = result.value.expect("must be some");
|
|
|
|
match value {
|
|
tvix_eval::Value::String(s) => {
|
|
assert_eq!(*s, "/deep/thought");
|
|
}
|
|
_ => panic!("unexpected value type: {:?}", value),
|
|
}
|
|
}
|
|
}
|