feat(cargo): allow customizable registry

e2e/backend/test_cargo_binstall

@@ -16,3 +16,9 @@ EOF
 
 mise i
 mise uninstall cargo:cargo-show cargo-binstall
+
+###### TEST CUSTOM REGISTRY ######
+export CARGO_REGISTRIES_OFFICIAL_GIT_INDEX=https://github.com/rust-lang/crates.io-index
+export MISE_CARGO_REGISTRY_NAME=official_git
+mise i
+mise uninstall cargo:cargo-show cargo-binstall

schema/mise.json

@@ -309,6 +309,10 @@
               "default": true,
               "description": "Use cargo-binstall instead of cargo install if available",
               "type": "boolean"
+            },
+            "registry_name": {
+              "description": "Name of the cargo registry to use.",
+              "type": "string"
             }
           }
         },

settings.toml

@@ -174,6 +174,19 @@ mise use -g cargo-binstall
 ```
 """
 
+[cargo.registry_name]
+env = "MISE_CARGO_REGISTRY_NAME"
+type = "String"
+optional = true
+description = "Name of the cargo registry to use."
+docs = """
+Packages are installed from the official cargo registry.
+
+You can set this to a different registry name if you have a custom feed or want to use a different source.
+
+Please follow the [cargo alternative registries documentation](https://doc.rust-lang.org/cargo/reference/registries.html#using-an-alternate-registry) to configure your registry.
+"""
+
 [cargo_binstall]
 type = "Bool"
 hide = true

src/backend/cargo.rs

@@ -58,6 +58,7 @@ impl Backend for CargoBackend {
     fn install_version_(&self, ctx: &InstallContext, tv: ToolVersion) -> eyre::Result<ToolVersion> {
         let config = Config::try_get()?;
         let install_arg = format!("{}@{}", self.tool_name(), tv.version);
+        let registry_name = &SETTINGS.cargo.registry_name;
 
         let cmd = CmdLineRunner::new("cargo").arg("install");
         let mut cmd = if let Some(url) = self.git_url() {
@@ -109,6 +110,9 @@ impl Backend for CargoBackend {
         if let Some(c) = opts.get("crate") {
             cmd = cmd.arg(c);
         }
+        if let Some(registry_name) = registry_name {
+            cmd = cmd.arg(format!("--registry={registry_name}"));
+        }
 
         cmd.arg("--root")
             .arg(tv.install_path())