83 lines
2.4 KiB
Rust
83 lines
2.4 KiB
Rust
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//! This contains the code translating from a `builtin:derivation` [Derivation]
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//! to a [Fetch].
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use crate::fetchers::Fetch;
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use nix_compat::{derivation::Derivation, nixhash::CAHash};
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use tracing::instrument;
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use url::Url;
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/// Takes a derivation produced by a call to `builtin:fetchurl` and returns the
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/// synthesized [Fetch] for it, as well as the name.
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#[instrument]
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pub(crate) fn fetchurl_derivation_to_fetch(drv: &Derivation) -> Result<(String, Fetch), Error> {
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if drv.builder != "builtin:fetchurl" {
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return Err(Error::BuilderInvalid);
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}
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if !drv.arguments.is_empty() {
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return Err(Error::ArgumentsInvalud);
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}
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if drv.system != "builtin" {
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return Err(Error::SystemInvalid);
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}
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// ensure this is a fixed-output derivation
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if drv.outputs.len() != 1 {
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return Err(Error::NoFOD);
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}
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let out_output = &drv.outputs.get("out").ok_or(Error::NoFOD)?;
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let ca_hash = out_output.ca_hash.clone().ok_or(Error::NoFOD)?;
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let name: String = drv
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.environment
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.get("name")
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.ok_or(Error::NameMissing)?
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.to_owned()
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.try_into()
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.map_err(|_| Error::NameInvalid)?;
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let url: Url = std::str::from_utf8(drv.environment.get("url").ok_or(Error::URLMissing)?)
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.map_err(|_| Error::URLInvalid)?
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.parse()
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.map_err(|_| Error::URLInvalid)?;
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match ca_hash {
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CAHash::Flat(hash) => {
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return Ok((
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name,
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Fetch::URL {
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url,
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exp_hash: Some(hash),
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},
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))
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}
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CAHash::Nar(hash) => {
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if drv.environment.get("executable").map(|v| v.as_slice()) == Some(b"1") {
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Ok((name, Fetch::Executable { url, hash }))
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} else {
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Ok((name, Fetch::NAR { url, hash }))
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}
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}
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// you can't construct derivations containing this
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CAHash::Text(_) => panic!("Tvix bug: got CaHash::Text in drv"),
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}
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}
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#[derive(Debug, thiserror::Error)]
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pub(crate) enum Error {
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#[error("Invalid builder")]
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BuilderInvalid,
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#[error("invalid arguments")]
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ArgumentsInvalud,
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#[error("Invalid system")]
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SystemInvalid,
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#[error("Derivation is not fixed-output")]
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NoFOD,
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#[error("Missing URL")]
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URLMissing,
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#[error("Invalid URL")]
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URLInvalid,
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#[error("Missing Name")]
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NameMissing,
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#[error("Name invalid")]
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NameInvalid,
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}
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