fix: unsupported protocol error on old macos version

src/cargo/core/package.rs

@@ -651,23 +651,6 @@ impl<'cfg> PackageSet<'cfg> {
     }
 }
 
-// When dynamically linked against libcurl, we want to ignore some failures
-// when using old versions that don't support certain features.
-macro_rules! try_old_curl {
-    ($e:expr, $msg:expr) => {
-        let result = $e;
-        if cfg!(target_os = "macos") {
-            if let Err(e) = result {
-                warn!("ignoring libcurl {} error: {}", $msg, e);
-            }
-        } else {
-            result.with_context(|| {
-                anyhow::format_err!("failed to enable {}, is curl not built right?", $msg)
-            })?;
-        }
-    };
-}
-
 impl<'a, 'cfg> Downloads<'a, 'cfg> {
     /// Starts to download the package for the `id` specified.
     ///
@@ -748,7 +731,7 @@ impl<'a, 'cfg> Downloads<'a, 'cfg> {
         // errors here on OSX, but consider this a fatal error to not activate
         // HTTP/2 on all other platforms.
         if self.set.multiplexing {
-            try_old_curl!(handle.http_version(HttpVersion::V2), "HTTP2");
+            crate::try_old_curl!(handle.http_version(HttpVersion::V2), "HTTP2");
         } else {
             handle.http_version(HttpVersion::V11)?;
         }
@@ -760,7 +743,7 @@ impl<'a, 'cfg> Downloads<'a, 'cfg> {
         // Once the main one is opened we realized that pipelining is possible
         // and multiplexing is possible with static.crates.io. All in all this
         // reduces the number of connections down to a more manageable state.
-        try_old_curl!(handle.pipewait(true), "pipewait");
+        crate::try_old_curl!(handle.pipewait(true), "pipewait");
 
         handle.write_function(move |buf| {
             debug!("{} - {} bytes of data", token, buf.len());

src/cargo/sources/registry/http_remote.rs

@@ -14,7 +14,7 @@ use anyhow::Context;
 use cargo_util::paths;
 use curl::easy::{HttpVersion, List};
 use curl::multi::{EasyHandle, Multi};
-use log::{debug, trace};
+use log::{debug, trace, warn};
 use std::cell::RefCell;
 use std::collections::{HashMap, HashSet};
 use std::fs::{self, File};
@@ -553,7 +553,7 @@ impl<'cfg> RegistryData for HttpRegistry<'cfg> {
 
         // Enable HTTP/2 if possible.
         if self.multiplexing {
-            handle.http_version(HttpVersion::V2)?;
+            crate::try_old_curl!(handle.http_version(HttpVersion::V2), "HTTP2");
         } else {
             handle.http_version(HttpVersion::V11)?;
         }
@@ -565,7 +565,7 @@ impl<'cfg> RegistryData for HttpRegistry<'cfg> {
         // Once the main one is opened we realized that pipelining is possible
         // and multiplexing is possible with static.crates.io. All in all this
         // reduces the number of connections done to a more manageable state.
-        handle.pipewait(true)?;
+        crate::try_old_curl!(handle.pipewait(true), "pipewait");
 
         let mut headers = List::new();
         // Include a header to identify the protocol. This allows the server to

src/cargo/util/network.rs

@@ -110,6 +110,24 @@ where
     }
 }
 
+// When dynamically linked against libcurl, we want to ignore some failures
+// when using old versions that don't support certain features.
+#[macro_export]
+macro_rules! try_old_curl {
+    ($e:expr, $msg:expr) => {
+        let result = $e;
+        if cfg!(target_os = "macos") {
+            if let Err(e) = result {
+                warn!("ignoring libcurl {} error: {}", $msg, e);
+            }
+        } else {
+            result.with_context(|| {
+                anyhow::format_err!("failed to enable {}, is curl not built right?", $msg)
+            })?;
+        }
+    };
+}
+
 #[test]
 fn with_retry_repeats_the_call_then_works() {
     use crate::core::Shell;