cache.rs

mod utils;

use tame_index::{index::cache::ValidCacheEntry, utils::get_index_details, IndexCache};

/// Validates that we can parse the current version of cache entries emitted by
/// cargo by reading the cache entry that should be there for one of this crate's
/// dependencies. This test should only fail if you have built the crate, wiped
/// the crates.io cache, then run the test executable without using cargo. If
/// you do that, that is your fault.
#[test]
fn parses_current_cargo_cache() {
    let (path, _url) = get_index_details(tame_index::CRATES_IO_HTTP_INDEX, None).unwrap();
    let cache = IndexCache::at_path(path);
    let lock = &utils::unlocked();

    let cached = cache
        .read_cache_file("camino".try_into().unwrap(), lock)
        .expect("failed to read cache file")
        .expect("cache file not found");

    let vce = ValidCacheEntry::read(&cached)
        .expect("failed to parse cargo cache file, we might need to update this crate");

    assert!(
        vce.revision.starts_with("etag:"),
        "cargo rarely/never writes anything but etag revisions to the cache"
    );

    let camino = vce
        .to_krate(None)
        .expect("failed to parse cache entry")
        .unwrap();

    // The initial version of camino used by this crate, this version will _always_
    // exist in the index, even if it yanked in the future, and is otherwise immutable
    let camino_version = camino
        .versions
        .iter()
        .find(|iv| iv.version == "1.1.4")
        .expect("failed to find expected version");

    assert_eq!(
        "c530edf18f37068ac2d977409ed5cd50d53d73bc653c7647b48eb78976ac9ae2",
        camino_version.checksum.to_string()
    );
}

/// Validates we can write cache files the exact same as the current version of cargo
#[test]
fn serializes_current_cargo_cache() {
    let (path, _url) = get_index_details(tame_index::CRATES_IO_HTTP_INDEX, None).unwrap();
    let cache = IndexCache::at_path(path);
    let lock = &utils::unlocked();

    let cargos = cache
        .read_cache_file("camino".try_into().unwrap(), lock)
        .expect("failed to read cache file")
        .expect("cache file not found");

    let cargo_ce = ValidCacheEntry::read(&cargos)
        .expect("failed to parse cargo cache file, we might need to update this crate");

    let cargos_krate = cargo_ce.to_krate(None).unwrap().unwrap();

    let mut ours = Vec::new();
    cargos_krate
        .write_cache_entry(&mut ours, cargo_ce.revision)
        .expect("failed to write");

    let our_ce = ValidCacheEntry::read(&ours).expect("failed to parse our cache file");

    assert_eq!(cargo_ce.revision, our_ce.revision);
    assert_eq!(cargo_ce.version_entries, our_ce.version_entries);
}