Use specific terminology for sparse HTTP-based registry

Git-based registry uses HTTP too

CHANGELOG.md

@@ -157,7 +157,7 @@
 - Start work on inheriting manifest values in a workspace.
   [#10497](https://github.com/rust-lang/cargo/pull/10497)
   [#10517](https://github.com/rust-lang/cargo/pull/10517)
-- Added support for HTTP registries.
+- Added support for sparse HTTP registries.
   [#10470](https://github.com/rust-lang/cargo/pull/10470)
   [#10064](https://github.com/rust-lang/cargo/pull/10064)
 - Fixed panic when artifact target is used for `[target.'cfg(<target>)'.dependencies]`

src/cargo/core/features.rs

@@ -653,7 +653,7 @@ unstable_cli_options!(
     no_index_update: bool = ("Do not update the registry index even if the cache is outdated"),
     panic_abort_tests: bool = ("Enable support to run tests with -Cpanic=abort"),
     host_config: bool = ("Enable the [host] section in the .cargo/config.toml file"),
-    http_registry: bool = ("Support HTTP-based crate registries"),
+    sparse_registry: bool = ("Support plain-HTTP-based crate registries"),
     target_applies_to_host: bool = ("Enable the `target-applies-to-host` key in the .cargo/config.toml file"),
     rustdoc_map: bool = ("Allow passing external documentation mappings to rustdoc"),
     separate_nightlies: bool = (HIDDEN),
@@ -907,7 +907,7 @@ impl CliUnstable {
             "multitarget" => self.multitarget = parse_empty(k, v)?,
             "rustdoc-map" => self.rustdoc_map = parse_empty(k, v)?,
             "terminal-width" => self.terminal_width = Some(parse_usize_opt(v)?),
-            "http-registry" => self.http_registry = parse_empty(k, v)?,
+            "sparse-registry" => self.sparse_registry = parse_empty(k, v)?,
             "namespaced-features" => stabilized_warn(k, "1.60", STABILISED_NAMESPACED_FEATURES),
             "weak-dep-features" => stabilized_warn(k, "1.60", STABILIZED_WEAK_DEP_FEATURES),
             "credential-process" => self.credential_process = parse_empty(k, v)?,

src/cargo/core/source/source_id.rs

@@ -208,9 +208,9 @@ impl SourceId {
     }
 
     /// Returns the `SourceId` corresponding to the main repository, using the
-    /// http index if allowed.
-    pub fn crates_io_maybe_http(config: &Config) -> CargoResult<SourceId> {
-        if config.cli_unstable().http_registry {
+    /// sparse HTTP index if allowed.
+    pub fn crates_io_maybe_sparse_http(config: &Config) -> CargoResult<SourceId> {
+        if config.cli_unstable().sparse_registry {
             config.check_registry_index_not_set()?;
             let url = CRATES_IO_HTTP_INDEX.into_url().unwrap();
             SourceId::new(SourceKind::Registry, url, Some(CRATES_IO_REGISTRY))

src/cargo/sources/config.rs

@@ -91,11 +91,11 @@ impl<'cfg> SourceConfigMap<'cfg> {
                 replace_with: None,
             },
         )?;
-        if config.cli_unstable().http_registry {
+        if config.cli_unstable().sparse_registry {
             base.add(
                 CRATES_IO_REGISTRY,
                 SourceConfig {
-                    id: SourceId::crates_io_maybe_http(config)?,
+                    id: SourceId::crates_io_maybe_sparse_http(config)?,
                     replace_with: None,
                 },
             )?;
@@ -257,7 +257,7 @@ restore the source replacement configuration to continue the build
             check_not_set("rev", def.rev)?;
         }
         if name == CRATES_IO_REGISTRY && srcs.is_empty() {
-            srcs.push(SourceId::crates_io_maybe_http(self.config)?);
+            srcs.push(SourceId::crates_io_maybe_sparse_http(self.config)?);
         }
 
         match srcs.len() {

src/cargo/sources/registry/http_remote.rs

@@ -131,8 +131,8 @@ impl<'cfg> HttpRegistry<'cfg> {
         config: &'cfg Config,
         name: &str,
     ) -> CargoResult<HttpRegistry<'cfg>> {
-        if !config.cli_unstable().http_registry {
-            anyhow::bail!("usage of HTTP-based registries requires `-Z http-registry`");
+        if !config.cli_unstable().sparse_registry {
+            anyhow::bail!("usage of HTTP-based registries requires `-Z sparse-registry`");
         }
         let url = source_id.url().as_str();
         // Ensure the url ends with a slash so we can concatenate paths.

src/doc/src/reference/unstable.md

@@ -102,7 +102,7 @@ Each new feature described below should explain how to use it.
 * Registries
     * [credential-process](#credential-process) — Adds support for fetching registry tokens from an external authentication program.
     * [`cargo logout`](#cargo-logout) — Adds the `logout` command to remove the currently saved registry token.
-    * [http-registry](#http-registry) — Adds support for fetching from http registries (`sparse+`)
+    * [sparse-registry](#sparse-registry) — Adds support for fetching from static-file HTTP registries (`sparse+`)
 
 ### allow-features
 
@@ -909,18 +909,18 @@ fn main() {
 }
 ```
 
-### http-registry
+### sparse-registry
 * Tracking Issue: [9069](https://github.com/rust-lang/cargo/issues/9069)
 * RFC: [#2789](https://github.com/rust-lang/rfcs/pull/2789)
 
-The `http-registry` feature allows cargo to interact with remote registries served
-over http rather than git. These registries can be identified by urls starting with
+The `sparse-registry` feature allows cargo to interact with remote registries served
+over plain HTTP rather than git. These registries can be identified by urls starting with
 `sparse+http://` or `sparse+https://`.
 
-When fetching index metadata over http, cargo only downloads the metadata for relevant
+When fetching index metadata over HTTP, cargo only downloads the metadata for relevant
 crates, which can save significant time and bandwidth.
 
-The format of the http index is identical to a checkout of a git-based index.
+The format of the sparse index is identical to a checkout of a git-based index.
 
 ### credential-process
 * Tracking Issue: [#8933](https://github.com/rust-lang/cargo/issues/8933)
@@ -1597,4 +1597,4 @@ See the [Features chapter](features.md#dependency-features) for more information
 
 The `-Ztimings` option has been stabilized as `--timings` in the 1.60 release.
 (`--timings=html` and the machine-readable `--timings=json` output remain
-unstable and require `-Zunstable-options`.)
+unstable and require `-Zunstable-options`.)

tests/testsuite/registry.rs

@@ -14,7 +14,7 @@ use std::path::Path;
 
 fn cargo_http(p: &Project, s: &str) -> Execs {
     let mut e = p.cargo(s);
-    e.arg("-Zhttp-registry").masquerade_as_nightly_cargo();
+    e.arg("-Zsparse-registry").masquerade_as_nightly_cargo();
     e
 }
 
@@ -2643,13 +2643,13 @@ fn http_requires_z_flag() {
 
     p.cargo("build")
         .with_status(101)
-        .with_stderr_contains("  usage of HTTP-based registries requires `-Z http-registry`")
+        .with_stderr_contains("  usage of HTTP-based registries requires `-Z sparse-registry`")
         .run();
 }
 
 #[cargo_test]
 fn http_requires_trailing_slash() {
-    cargo_process("-Z http-registry install bar --index sparse+https://index.crates.io")
+    cargo_process("-Z sparse-registry install bar --index sparse+https://index.crates.io")
         .masquerade_as_nightly_cargo()
         .with_status(101)
         .with_stderr("[ERROR] registry url must end in a slash `/`: sparse+https://index.crates.io")