Auto merge of #11447 - arlosi:exact, r=weihanglo

Crate checksum lookup query should match on semver build metadata

Since crates.io allows crate versions to differ only by build metadata, a query using `OptVersionReq::exact` + `next()` can return nondeterministic results.

This change fixes the issue by adding an additional `filter` that ensures the version is equal (including build metadata).

It still feels somewhat wrong that a query using `exact` can match multiple crates, so an alternative fix would be to add a new variant of `OptVersionReq` that also matched on build metadata.

Fixes #11412

src/cargo/sources/registry/index.rs

@@ -379,7 +379,9 @@ impl<'cfg> RegistryIndex<'cfg> {
     pub fn hash(&mut self, pkg: PackageId, load: &mut dyn RegistryData) -> Poll<CargoResult<&str>> {
         let req = OptVersionReq::exact(pkg.version());
         let summary = self.summaries(&pkg.name(), &req, load)?;
-        let summary = ready!(summary).next();
+        let summary = ready!(summary)
+            .filter(|s| s.summary.version() == pkg.version())
+            .next();
         Poll::Ready(Ok(summary
             .ok_or_else(|| internal(format!("no hash listed for {}", pkg)))?
             .summary
@@ -623,10 +625,10 @@ impl<'cfg> RegistryIndex<'cfg> {
         load: &mut dyn RegistryData,
     ) -> Poll<CargoResult<bool>> {
         let req = OptVersionReq::exact(pkg.version());
-        let found = self
-            .summaries(&pkg.name(), &req, load)
-            .map_ok(|mut p| p.any(|summary| summary.yanked));
-        found
+        let found = ready!(self.summaries(&pkg.name(), &req, load))?
+            .filter(|s| s.summary.version() == pkg.version())
+            .any(|summary| summary.yanked);
+        Poll::Ready(Ok(found))
     }
 }
 

src/cargo/sources/registry/mod.rs

@@ -694,6 +694,7 @@ impl<'cfg> RegistrySource<'cfg> {
             .summaries(&package.name(), &req, &mut *self.ops)?
             .expect("a downloaded dep now pending!?")
             .map(|s| s.summary.clone())
+            .filter(|s| s.version() == package.version())
             .next()
             .expect("summary not found");
         if let Some(cksum) = summary_with_cksum.checksum() {

tests/testsuite/registry.rs

@@ -3529,3 +3529,38 @@ fn unpack_again_when_cargo_ok_is_unrecognized() {
     let ok = fs::read_to_string(&cargo_ok).unwrap();
     assert_eq!(&ok, r#"{"v":1}"#);
 }
+
+#[cargo_test]
+fn differ_only_by_metadata() {
+    let p = project()
+        .file(
+            "Cargo.toml",
+            r#"
+                [package]
+                name = "foo"
+                version = "0.0.1"
+                authors = []
+
+                [dependencies]
+                baz = "=0.0.1"
+            "#,
+        )
+        .file("src/main.rs", "fn main() {}")
+        .build();
+
+    Package::new("baz", "0.0.1+b").publish();
+    Package::new("baz", "0.0.1+c").yanked(true).publish();
+
+    p.cargo("check")
+        .with_stderr(
+            "\
+[UPDATING] `dummy-registry` index
+[DOWNLOADING] crates ...
+[DOWNLOADED] [..] v0.0.1+b (registry `dummy-registry`)
+[CHECKING] baz v0.0.1+b
+[CHECKING] foo v0.0.1 ([CWD])
+[FINISHED] dev [unoptimized + debuginfo] target(s) in [..]s
+",
+        )
+        .run();
+}