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|
//! Implements `builtins.derivation`, the core of what makes Nix build packages.
use std::collections::{btree_map, BTreeSet};
use tvix_derivation::Derivation;
use tvix_eval::{AddContext, ErrorKind, NixList, VM};
use crate::errors::Error;
use crate::known_paths::{KnownPaths, PathType};
/// Helper function for populating the `drv.outputs` field from a
/// manually specified set of outputs, instead of the default
/// `outputs`.
fn populate_outputs(vm: &mut VM, drv: &mut Derivation, outputs: NixList) -> Result<(), ErrorKind> {
// Remove the original default `out` output.
drv.outputs.clear();
for output in outputs {
let output_name = output
.force(vm)?
.to_str()
.context("determining output name")?;
if drv
.outputs
.insert(output_name.as_str().into(), Default::default())
.is_some()
{
return Err(Error::DuplicateOutput(output_name.as_str().into()).into());
}
}
Ok(())
}
/// Populate the inputs of a derivation from the build references
/// found when scanning the derivation's parameters.
fn populate_inputs<I: IntoIterator<Item = String>>(
drv: &mut Derivation,
known_paths: &KnownPaths,
references: I,
) {
for reference in references.into_iter() {
match &known_paths[&reference] {
PathType::Plain => {
drv.input_sources.insert(reference.to_string());
}
PathType::Output { name, derivation } => {
match drv.input_derivations.entry(derivation.clone()) {
btree_map::Entry::Vacant(entry) => {
entry.insert(BTreeSet::from([name.clone()]));
}
btree_map::Entry::Occupied(mut entry) => {
entry.get_mut().insert(name.clone());
}
}
}
PathType::Derivation { output_names } => {
match drv.input_derivations.entry(reference.to_string()) {
btree_map::Entry::Vacant(entry) => {
entry.insert(output_names.clone());
}
btree_map::Entry::Occupied(mut entry) => {
entry.get_mut().extend(output_names.clone().into_iter());
}
}
}
}
}
}
#[cfg(test)]
mod tests {
use super::*;
use tvix_eval::observer::NoOpObserver;
use tvix_eval::Value;
static mut OBSERVER: NoOpObserver = NoOpObserver {};
// Creates a fake VM for tests, which can *not* actually be
// used to force (most) values but can satisfy the type
// parameter.
fn fake_vm() -> VM<'static> {
// safe because accessing the observer doesn't actually do anything
unsafe {
VM::new(
Default::default(),
Box::new(tvix_eval::DummyIO),
&mut OBSERVER,
Default::default(),
)
}
}
#[test]
fn populate_outputs_ok() {
let mut vm = fake_vm();
let mut drv = Derivation::default();
drv.outputs.insert("out".to_string(), Default::default());
let outputs = NixList::construct(
2,
vec![Value::String("foo".into()), Value::String("bar".into())],
);
populate_outputs(&mut vm, &mut drv, outputs).expect("populate_outputs should succeed");
assert_eq!(drv.outputs.len(), 2);
assert!(drv.outputs.contains_key("bar"));
assert!(drv.outputs.contains_key("foo"));
}
#[test]
fn populate_outputs_duplicate() {
let mut vm = fake_vm();
let mut drv = Derivation::default();
drv.outputs.insert("out".to_string(), Default::default());
let outputs = NixList::construct(
2,
vec![Value::String("foo".into()), Value::String("foo".into())],
);
populate_outputs(&mut vm, &mut drv, outputs)
.expect_err("supplying duplicate outputs should fail");
}
#[test]
fn populate_inputs_empty() {
let mut drv = Derivation::default();
let paths = KnownPaths::default();
let inputs = vec![];
populate_inputs(&mut drv, &paths, inputs);
assert!(drv.input_sources.is_empty());
assert!(drv.input_derivations.is_empty());
}
#[test]
fn populate_inputs_all() {
let mut drv = Derivation::default();
let mut paths = KnownPaths::default();
paths.plain("/nix/store/fn7zvafq26f0c8b17brs7s95s10ibfzs-foo");
paths.drv(
"/nix/store/aqffiyqx602lbam7n1zsaz3yrh6v08pc-bar.drv",
&["out"],
);
paths.output(
"/nix/store/zvpskvjwi72fjxg0vzq822sfvq20mq4l-bar",
"out",
"/nix/store/aqffiyqx602lbam7n1zsaz3yrh6v08pc-bar.drv",
);
let inputs: Vec<String> = vec![
"/nix/store/fn7zvafq26f0c8b17brs7s95s10ibfzs-foo".into(),
"/nix/store/aqffiyqx602lbam7n1zsaz3yrh6v08pc-bar.drv".into(),
"/nix/store/zvpskvjwi72fjxg0vzq822sfvq20mq4l-bar".into(),
];
populate_inputs(&mut drv, &paths, inputs);
assert_eq!(drv.input_sources.len(), 1);
assert!(drv
.input_sources
.contains("/nix/store/fn7zvafq26f0c8b17brs7s95s10ibfzs-foo"));
assert_eq!(drv.input_derivations.len(), 1);
assert!(drv
.input_derivations
.contains_key("/nix/store/aqffiyqx602lbam7n1zsaz3yrh6v08pc-bar.drv"));
}
}
|
