refactor: alt_registry_key -> registry_key

Given we remove `SourceId::name` field, `alt_registry_key` is no longer
only for alternative registries.

src/cargo/core/source_id.rs

@@ -51,10 +51,10 @@ struct SourceIdInner {
     kind: SourceKind,
     /// For example, the exact Git revision of the specified branch for a Git Source.
     precise: Option<String>,
-    /// Name of the alt registry in the `[registries]` table.
-    /// WARNING: this is not always set for alt-registries when the name is
-    /// not known.
-    alt_registry_key: Option<String>,
+    /// Name of the remote registry as defined in the `[registries]` table.
+    ///
+    /// WARNING: this is not always set for alt-registries when the name is not known.
+    registry_key: Option<String>,
 }
 
 /// The possible kinds of code source.
@@ -107,7 +107,7 @@ impl SourceId {
             canonical_url: CanonicalUrl::new(&url)?,
             url,
             precise: None,
-            alt_registry_key: key.map(|k| k.into()),
+            registry_key: key.map(|k| k.into()),
         });
         Ok(source_id)
     }
@@ -315,7 +315,7 @@ impl SourceId {
     pub fn display_registry_name(self) -> String {
         if self.is_crates_io() {
             CRATES_IO_REGISTRY.to_string()
-        } else if let Some(key) = &self.inner.alt_registry_key {
+        } else if let Some(key) = &self.inner.registry_key {
             key.clone()
         } else if self.precise().is_some() {
             // We remove `precise` here to retrieve an permissive version of
@@ -327,10 +327,10 @@ impl SourceId {
     }
 
     /// Gets the name of the remote registry as defined in the `[registries]` table.
-    /// WARNING: alt registries that come from Cargo.lock, or --index will
-    /// not have a name.
-    pub fn alt_registry_key(&self) -> Option<&str> {
-        self.inner.alt_registry_key.as_deref()
+    ///
+    /// WARNING: alt registries that come from Cargo.lock, or `--index` will not have a name.
+    pub fn registry_key(&self) -> Option<&str> {
+        self.inner.registry_key.as_deref()
     }
 
     /// Returns `true` if this source is from a filesystem path.
@@ -643,10 +643,9 @@ impl Hash for SourceId {
 /// The hash of `SourceIdInner` is used to retrieve its interned value from
 /// `SOURCE_ID_CACHE`. We only care about fields that make `SourceIdInner`
 /// unique. Optional fields not affecting the uniqueness must be excluded,
-/// such as [`name`] and [`alt_registry_key`]. That's why this is not derived.
+/// such as [`registry_key`]. That's why this is not derived.
 ///
-/// [`name`]: SourceIdInner::name
-/// [`alt_registry_key`]: SourceIdInner::alt_registry_key
+/// [`registry_key`]: SourceIdInner::registry_key
 impl Hash for SourceIdInner {
     fn hash<S: hash::Hasher>(&self, into: &mut S) {
         self.kind.hash(into);

src/cargo/ops/registry/mod.rs

@@ -188,7 +188,7 @@ fn get_source_id(
         .replaced_source_id();
     if reg.is_none() && index.is_none() && replacement_sid != builtin_replacement_sid {
         // Neither --registry nor --index was passed and the user has configured source-replacement.
-        if let Some(replacement_name) = replacement_sid.alt_registry_key() {
+        if let Some(replacement_name) = replacement_sid.registry_key() {
             bail!("crates-io is replaced with remote registry {replacement_name};\ninclude `--registry {replacement_name}` or `--registry crates-io`");
         } else {
             bail!("crates-io is replaced with non-remote-registry source {replacement_sid};\ninclude `--registry crates-io` to use crates.io");

src/cargo/util/auth/mod.rs

@@ -315,7 +315,7 @@ fn registry_credential_config_raw_uncached(
     // If the name doesn't match, leave a note to help the user understand
     // the potentially confusing situation.
     if let Some(name) = name.as_deref() {
-        if Some(name) != sid.alt_registry_key() {
+        if Some(name) != sid.registry_key() {
             config.shell().note(format!(
                 "name of alternative registry `{}` set to `{name}`",
                 sid.url()
@@ -429,7 +429,7 @@ impl fmt::Display for AuthorizationError {
                 write!(f, "\nor use environment variable CARGO_REGISTRY_TOKEN")?;
             }
             Ok(())
-        } else if let Some(name) = self.sid.alt_registry_key() {
+        } else if let Some(name) = self.sid.registry_key() {
             let key = ConfigKey::from_str(&format!("registries.{name}.token"));
             write!(
                 f,
@@ -500,7 +500,7 @@ fn credential_action(
     let name = if sid.is_crates_io() {
         Some(CRATES_IO_REGISTRY)
     } else {
-        sid.alt_registry_key()
+        sid.registry_key()
     };
     let registry = RegistryInfo {
         index_url: sid.url().as_str(),

src/cargo/util/config/mod.rs

@@ -2240,7 +2240,7 @@ pub fn save_credentials(
         None
     } else {
         let name = registry
-            .alt_registry_key()
+            .registry_key()
             .ok_or_else(|| internal("can't save credentials for anonymous registry"))?;
         Some(name)
     };