From 2566656cd58d80ebc521fb7c20c1bb026d53f589 Mon Sep 17 00:00:00 2001
From: Ryan Lopopolo <rjl@hyperbo.la>
Date: Wed, 21 Dec 2022 11:00:55 -0800
Subject: [PATCH] Add action to setup code coverage with nightly rust and llvm
 tools

---
 .github/labels.yaml       |  3 +++
 .github/workflows/ci.yaml | 16 ++++++++++++++++
 code-coverage/action.yaml | 37 +++++++++++++++++++++++++++++++++++++
 3 files changed, 56 insertions(+)
 create mode 100644 code-coverage/action.yaml

diff --git a/.github/labels.yaml b/.github/labels.yaml
index e2a06a1..b33197d 100644
--- a/.github/labels.yaml
+++ b/.github/labels.yaml
@@ -8,6 +8,9 @@
 - name: "A-build-and-test"
   color: "f7e101"
   description: "Area: Build and test configurable toolchain."
+- name: "A-code-coverage"
+  color: "f7e101"
+  description: "Area: Code coverage configurable toolchain."
 - name: "A-deps"
   color: "f7e101"
   description: "Area: Source and library dependencies."
diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index c89c9ef..f684e33 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -126,6 +126,22 @@ jobs:
       - name: Check that nightly toolchain is installed
         run: rustc +nightly -Vv
 
+  test-setup-code-coverage-toolchain:
+    name: Test setup code coverage toolchain action
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+        with:
+          path: setup-rust-action
+
+      - name: Setup stable audit toolchain
+        uses: ./setup-rust-action/code-coverage
+
+      - name: Check that active toolchain is stable
+        run: |
+          [[ "$(rustup show active-toolchain)" == nightly-* ]]
+
   test-setup-lint-and-format-toolchain:
     name: Test setup lint and format toolchain action
     runs-on: ubuntu-latest
diff --git a/code-coverage/action.yaml b/code-coverage/action.yaml
new file mode 100644
index 0000000..1b2f92f
--- /dev/null
+++ b/code-coverage/action.yaml
@@ -0,0 +1,37 @@
+---
+name: "Audit Toolchain"
+description: "Setup a nightly Rust toolchain with llvm-tools so code coverage works"
+
+inputs:
+  toolchain:
+    description: "Rustup toolchain"
+    required: true
+    default: "nightly"
+
+runs:
+  using: "composite"
+  steps:
+    - name: Install ${{ inputs.toolchain }} toolchain
+      shell: bash
+      run: rustup toolchain install "${{ inputs.toolchain }}" --profile minimal --component llvm-tools-preview
+
+    - name: Update ${{ inputs.toolchain }} toolchain
+      shell: bash
+      run: rustup update "${{ inputs.toolchain }}"
+
+    - name: Set default toolchain to ${{ inputs.toolchain }}
+      shell: bash
+      # https://rust-lang.github.io/rustup/overrides.html
+      run: echo 'RUSTUP_TOOLCHAIN=${{ inputs.toolchain }}' >> "$GITHUB_ENV"
+
+    - name: Show rustup version
+      shell: bash
+      run: rustup -Vv
+
+    - name: Show ${{ inputs.toolchain }} rustc version
+      shell: bash
+      run: rustc +${{ inputs.toolchain }} -Vv
+
+    - name: Show ${{ inputs.toolchain }} cargo version
+      shell: bash
+      run: cargo +${{ inputs.toolchain }} version --verbose