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https://github.com/rust-lang/cargo
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Make cargo metadata
output deterministic
Uses BTreeMap instead of HashMap for the `cargo metadata` command. The change did not cause a measurable performance impact for running `cargo metadata` on `cargo` itself. Fixes #8477
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@ -6,7 +6,7 @@ use crate::ops::{self, Packages};
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use crate::util::CargoResult;
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use cargo_platform::Platform;
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use serde::Serialize;
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use std::collections::HashMap;
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use std::collections::BTreeMap;
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use std::path::PathBuf;
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const VERSION: u32 = 1;
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@ -130,7 +130,7 @@ fn build_resolve_graph(
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// Download all Packages. This is needed to serialize the information
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// for every package. In theory this could honor target filtering,
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// but that would be somewhat complex.
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let mut package_map: HashMap<PackageId, Package> = ws_resolve
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let package_map: BTreeMap<PackageId, Package> = ws_resolve
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.pkg_set
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.get_many(ws_resolve.pkg_set.package_ids())?
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.into_iter()
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@ -140,7 +140,7 @@ fn build_resolve_graph(
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// Start from the workspace roots, and recurse through filling out the
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// map, filtering targets as necessary.
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let mut node_map = HashMap::new();
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let mut node_map = BTreeMap::new();
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for member_pkg in ws.members() {
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build_resolve_graph_r(
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&mut node_map,
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@ -153,21 +153,22 @@ fn build_resolve_graph(
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}
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// Get a Vec of Packages.
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let actual_packages = package_map
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.drain()
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.into_iter()
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.filter_map(|(pkg_id, pkg)| node_map.get(&pkg_id).map(|_| pkg))
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.collect();
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let mr = MetadataResolve {
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nodes: node_map.drain().map(|(_pkg_id, node)| node).collect(),
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nodes: node_map.into_iter().map(|(_pkg_id, node)| node).collect(),
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root: ws.current_opt().map(|pkg| pkg.package_id()),
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};
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Ok((actual_packages, mr))
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}
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fn build_resolve_graph_r(
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node_map: &mut HashMap<PackageId, MetadataResolveNode>,
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node_map: &mut BTreeMap<PackageId, MetadataResolveNode>,
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pkg_id: PackageId,
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resolve: &Resolve,
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package_map: &HashMap<PackageId, Package>,
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package_map: &BTreeMap<PackageId, Package>,
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target_data: &RustcTargetData,
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requested_kinds: &[CompileKind],
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) {
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