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//! Parser for the Nix archive listing format, aka .ls.
//!
//! LS files are produced by the C++ Nix implementation via `write-nar-listing=1` query parameter
//! passed to a store implementation when transferring store paths.
//!
//! Listing files contains metadata about a file and its offset in the corresponding NAR.
//!
//! NOTE: LS entries does not offer any integrity field to validate the retrieved file at the provided
//! offset. Validating the contents is the caller's responsibility.
use std::collections::HashMap;
use serde::Deserialize;
#[cfg(test)]
mod test;
#[derive(Debug, Deserialize)]
#[serde(tag = "type", rename_all = "lowercase")]
pub enum ListingEntry {
Regular {
size: u64,
#[serde(default)]
executable: bool,
#[serde(rename = "narOffset")]
nar_offset: u64,
},
Directory {
entries: HashMap<String, ListingEntry>,
},
Symlink {
target: String,
},
}
#[derive(Debug)]
pub struct ListingVersion<const V: u8>;
#[derive(Debug, thiserror::Error)]
#[error("Invalid version: {0}")]
struct ListingVersionError(u8);
impl<'de, const V: u8> Deserialize<'de> for ListingVersion<V> {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: serde::Deserializer<'de>,
{
let value = u8::deserialize(deserializer)?;
if value == V {
Ok(ListingVersion::<V>)
} else {
Err(serde::de::Error::custom(ListingVersionError(value)))
}
}
}
#[derive(Debug, Deserialize)]
#[serde(untagged)]
#[non_exhaustive]
pub enum Listing {
V1 {
root: ListingEntry,
version: ListingVersion<1>,
},
}
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