From 1bccaa17153dd5b54a187fe4cb29f99f47cac4fb Mon Sep 17 00:00:00 2001
From: David Tolnay <dtolnay@gmail.com>
Date: Sat, 9 Oct 2021 06:06:28 +0100
Subject: [PATCH] Emit allow-downgrade flag only on nightly with components

---
 action.yml | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/action.yml b/action.yml
index 3ad5183..2067242 100644
--- a/action.yml
+++ b/action.yml
@@ -26,12 +26,13 @@ runs:
         : construct rustup command line
         echo "::set-output name=targets::$(for t in ${targets//,/ }; do echo -n ' --target' $t; done)"
         echo "::set-output name=components::$(for c in ${components//,/ }; do echo -n ' --component' $c; done)"
+        echo "::set-output name=downgrade::${{inputs.toolchain == 'nightly' && inputs.components && ' --allow-downgrade' || ''}}"
       env:
         targets: ${{inputs.target}}
         components: ${{inputs.components}}
       shell: bash
     - name: rustup toolchain install ${{inputs.toolchain}}
-      run: rustup toolchain install ${{inputs.toolchain}}${{steps.flags.outputs.targets}}${{steps.flags.outputs.components}} --profile minimal --allow-downgrade --no-self-update
+      run: rustup toolchain install ${{inputs.toolchain}}${{steps.flags.outputs.targets}}${{steps.flags.outputs.components}} --profile minimal${{steps.flags.outputs.downgrade}} --no-self-update
       shell: bash
     - run: rustup default ${{inputs.toolchain}}
       shell: bash