Fix confusing error messages for sparse index replaced source

src/cargo/sources/replaced.rs

@@ -6,8 +6,6 @@ use crate::sources::IndexSummary;
 use crate::util::errors::CargoResult;
 use std::task::Poll;
 
-use anyhow::Context as _;
-
 /// A source that replaces one source with the other. This manages the [source
 /// replacement] feature.
 ///
@@ -37,6 +35,14 @@ impl<'cfg> ReplacedSource<'cfg> {
             inner: src,
         }
     }
+
+    /// Is this source a built-in replacement of crates.io?
+    ///
+    /// Built-in source replacement of crates.io for sparse registry or tests
+    /// should not show messages indicating source replacement.
+    fn is_builtin_replacement(&self) -> bool {
+        self.replace_with.is_crates_io() && self.to_replace.is_crates_io()
+    }
 }
 
 impl<'cfg> Source for ReplacedSource<'cfg> {
@@ -70,10 +76,14 @@ impl<'cfg> Source for ReplacedSource<'cfg> {
                 f(summary.map_summary(|s| s.map_source(replace_with, to_replace)))
             })
             .map_err(|e| {
-                e.context(format!(
-                    "failed to query replaced source {}",
-                    self.to_replace
-                ))
+                if self.is_builtin_replacement() {
+                    e
+                } else {
+                    e.context(format!(
+                        "failed to query replaced source {}",
+                        self.to_replace
+                    ))
+                }
             })
     }
 
@@ -87,10 +97,16 @@ impl<'cfg> Source for ReplacedSource<'cfg> {
 
     fn download(&mut self, id: PackageId) -> CargoResult<MaybePackage> {
         let id = id.with_source_id(self.replace_with);
-        let pkg = self
-            .inner
-            .download(id)
-            .with_context(|| format!("failed to download replaced source {}", self.to_replace))?;
+        let pkg = self.inner.download(id).map_err(|e| {
+            if self.is_builtin_replacement() {
+                e
+            } else {
+                e.context(format!(
+                    "failed to download replaced source {}",
+                    self.to_replace
+                ))
+            }
+        })?;
         Ok(match pkg {
             MaybePackage::Ready(pkg) => {
                 MaybePackage::Ready(pkg.map_source(self.replace_with, self.to_replace))
@@ -101,10 +117,16 @@ impl<'cfg> Source for ReplacedSource<'cfg> {
 
     fn finish_download(&mut self, id: PackageId, data: Vec<u8>) -> CargoResult<Package> {
         let id = id.with_source_id(self.replace_with);
-        let pkg = self
-            .inner
-            .finish_download(id, data)
-            .with_context(|| format!("failed to download replaced source {}", self.to_replace))?;
+        let pkg = self.inner.finish_download(id, data).map_err(|e| {
+            if self.is_builtin_replacement() {
+                e
+            } else {
+                e.context(format!(
+                    "failed to download replaced source {}",
+                    self.to_replace
+                ))
+            }
+        })?;
         Ok(pkg.map_source(self.replace_with, self.to_replace))
     }
 
@@ -118,9 +140,7 @@ impl<'cfg> Source for ReplacedSource<'cfg> {
     }
 
     fn describe(&self) -> String {
-        if self.replace_with.is_crates_io() && self.to_replace.is_crates_io() {
-            // Built-in source replacement of crates.io for sparse registry or tests
-            // doesn't need duplicate description (crates.io replacing crates.io).
+        if self.is_builtin_replacement() {
             self.inner.describe()
         } else {
             format!(
@@ -148,8 +168,15 @@ impl<'cfg> Source for ReplacedSource<'cfg> {
     }
 
     fn block_until_ready(&mut self) -> CargoResult<()> {
-        self.inner
-            .block_until_ready()
-            .with_context(|| format!("failed to update replaced source {}", self.to_replace))
+        self.inner.block_until_ready().map_err(|e| {
+            if self.is_builtin_replacement() {
+                e
+            } else {
+                e.context(format!(
+                    "failed to update replaced source {}",
+                    self.to_replace
+                ))
+            }
+        })
     }
 }

tests/testsuite/credential_process.rs

@@ -275,10 +275,7 @@ fn not_found() {
             r#"[UPDATING] [..]
 [CREDENTIAL] [..]not_found[..] get crates-io
 {"v":1[..]
-[ERROR] failed to query replaced source registry `crates-io`
-
-Caused by:
-  no token found, please run `cargo login`
+[ERROR] no token found, please run `cargo login`
 "#,
         )
         .run();
@@ -314,10 +311,7 @@ fn all_not_found() {
             r#"[UPDATING] [..]
 [CREDENTIAL] [..]not_found[..] get crates-io
 {"v":1,"registry":{"index-url":"[..]","name":"crates-io","headers":[[..]"WWW-Authenticate: Cargo login_url=\"https://test-registry-login/me\""[..]]},"kind":"get","operation":"read"}
-[ERROR] failed to query replaced source registry `crates-io`
-
-Caused by:
-  no token found, please run `cargo login`
+[ERROR] no token found, please run `cargo login`
 "#,
         )
         .run();
@@ -353,10 +347,7 @@ fn all_not_supported() {
             r#"[UPDATING] [..]
 [CREDENTIAL] [..]not_supported[..] get crates-io
 {"v":1,"registry":{"index-url":"[..]","name":"crates-io","headers":[[..]"WWW-Authenticate: Cargo login_url=\"https://test-registry-login/me\""[..]]},"kind":"get","operation":"read"}
-[ERROR] failed to query replaced source registry `crates-io`
-
-Caused by:
-  no credential providers could handle the request
+[ERROR] no credential providers could handle the request
 "#,
         )
         .run();

tests/testsuite/registry.rs

@@ -3664,3 +3664,42 @@ fn differ_only_by_metadata_with_lockfile() {
         )
         .run();
 }
+
+#[cargo_test]
+fn builtin_source_replacement() {
+    // errors for builtin source replacement of crates.io
+    // should not include mention of source replacement in the error message.
+    let server = RegistryBuilder::new().build();
+
+    let p = project()
+        .file(
+            "Cargo.toml",
+            r#"
+                [package]
+                name = "foo"
+                version = "0.0.1"
+
+                [dependencies]
+                bad-cksum = ">= 0.0.0"
+            "#,
+        )
+        .file("src/main.rs", "fn main() {}")
+        .build();
+
+    let pkg = Package::new("bad-cksum", "0.0.1");
+    pkg.publish();
+    t!(File::create(&pkg.archive_dst()));
+
+    p.cargo("check -v")
+        .replace_crates_io(&server.index_url())
+        .with_status(101)
+        .with_stderr(
+            "\
+[UPDATING] [..] index
+[DOWNLOADING] crates ...
+[DOWNLOADED] bad-cksum [..]
+[ERROR] failed to verify the checksum of `bad-cksum v0.0.1`
+",
+        )
+        .run();
+}