Add override input parameter that controls the rustup override behavior

Author: jonasbb

CHANGELOG.md

@@ -11,6 +11,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * Add new parameter `cache-key` that is propagated to `Swatinem/rust-cache` as `key` (#41 by @iainlane)
 * Make rustup toolchain installation more robust in light of planned changes https://github.com/rust-lang/rustup/issues/3635 and https://github.com/rust-lang/rustup/pull/3985
 * Allow installing multiple Rust toolchains by specifying multiple versions in the `toolchain` input parameter.
+* Configure the `rustup override` behavior via the new `override` input. (#38)
 
 ## [1.9.0] - 2024-06-08
 

README.md

@@ -60,6 +60,7 @@ Afterward, the `components` and `target` specified via inputs are installed in a
 | `cache-key`         | Propagates the value to [`Swatinem/rust-cache`] as `key`                                                                 |               |
 | `matcher`           | Enable problem matcher to surface build messages and formatting issues                                                   | true          |
 | `rustflags`         | Set the value of `RUSTFLAGS` (set to empty string to avoid overwriting existing flags)                                   | "-D warnings" |
+| `override`          | Setup the last installed toolchain as the default via `rustup override`                                                  | true          |
 
 [`Swatinem/rust-cache`]: https://github.com/Swatinem/rust-cache
 

action.yml

@@ -46,6 +46,10 @@ inputs:
     description: "set RUSTFLAGS environment variable, set to empty string to avoid overwriting build.rustflags"
     required: false
     default: "-D warnings"
+  override:
+    description: "Setup the last installed toolchain as the default via `rustup override`"
+    required: false
+    default: "true"
 
 outputs:
   rustc-version:
@@ -132,6 +136,7 @@ runs:
         toolchain: ${{inputs.toolchain}}
         targets: ${{inputs.target}}
         components: ${{inputs.components}}
+        override: ${{inputs.override}}
       shell: bash
       run: |
         if [[ -z "$toolchain" && ( -f "rust-toolchain" || -f "rust-toolchain.toml" ) ]]
@@ -154,7 +159,10 @@ runs:
           fi
           rustup toolchain install ${toolchain//,/ } ${{steps.flags.outputs.targets}}${{steps.flags.outputs.components}} --profile minimal${{steps.flags.outputs.downgrade}} --no-self-update
           # Take the last element from the list
-          rustup override set ${toolchain//*,/ }
+          if [[ "$override" == "true" ]]
+          then
+            rustup override set ${toolchain//*,/ }
+          fi
         fi
 
     - id: versions