From 74b31f5a2dba1f90d97293d187c799fddda6f63e Mon Sep 17 00:00:00 2001
From: Nikki B <nb@concordium.com>
Date: Tue, 9 Sep 2025 08:39:10 +0100
Subject: [PATCH] chore: add codecov.yml. check it posts comment

---
 .github/codecov.yml               |  9 ++++++++
 .github/workflows/build-test.yaml | 36 ++++++++++++++++++++++++++++++-
 2 files changed, 44 insertions(+), 1 deletion(-)
 create mode 100644 .github/codecov.yml

diff --git a/.github/codecov.yml b/.github/codecov.yml
new file mode 100644
index 0000000000..dd7c551c59
--- /dev/null
+++ b/.github/codecov.yml
@@ -0,0 +1,9 @@
+# Settings via https://docs.codecov.com/docs/common-recipe-list
+coverage:
+  status:
+    project:
+      default:
+        informational: true
+comment:
+  layout: " diff, flags, files"
+  behavior: default
\ No newline at end of file
diff --git a/.github/workflows/build-test.yaml b/.github/workflows/build-test.yaml
index 5ae9e1a81f..a31f9262aa 100644
--- a/.github/workflows/build-test.yaml
+++ b/.github/workflows/build-test.yaml
@@ -130,6 +130,9 @@ jobs:
     # Use fixed OS version because we install packages on the system.
     runs-on: ubuntu-22.04
     if: ${{ !github.event.pull_request.draft }}
+    env:
+      RUSTFLAGS: "-Cinstrument-coverage"
+      LLVM_PROFILE_FILE: "concordium-node-%p-%m.profraw"
 
     strategy:
       matrix:
@@ -168,7 +171,7 @@ jobs:
         profile: minimal
         toolchain: ${{ matrix.plan.rust }}
         override: true
-        components: clippy
+        components: clippy, llvm-tools
         target: x86_64-pc-windows-gnu
     - name: Cache cargo dependencies and targets
       uses: actions/cache@v4
@@ -242,9 +245,15 @@ jobs:
       run: |
         cargo check --locked --manifest-path collector/Cargo.toml
     - name: Check that the Windows node runner service compiles (gnu toolchain, disable embedded resources)
+      # Instrument coverage flag doesn't seem to be supported in windows target
+      env:
+        RUSTFLAGS: ""
       run: |
         cargo check --locked --target x86_64-pc-windows-gnu --manifest-path service/windows/Cargo.toml --workspace --no-default-features
     - name: Check that the Windows installer custom action library compiles (gnu toolchain)
+      # Instrument coverage flag doesn't seem to be supported in windows target
+      env:
+        RUSTFLAGS: ""
       run: |
         cargo check --locked --target x86_64-pc-windows-gnu --manifest-path service/windows/installer/custom-actions/Cargo.toml --workspace
     - name: Run clippy (without extra features)
@@ -260,9 +269,15 @@ jobs:
       run: |
         cargo clippy --locked --manifest-path collector/Cargo.toml -- -D warnings
     - name: Run clippy on Windows node runner service
+      # Instrument coverage flag doesn't seem to be supported in windows?
+      env:
+        RUSTFLAGS: ""
       run: |
         cargo clippy --locked --target x86_64-pc-windows-gnu --manifest-path service/windows/Cargo.toml --all --no-default-features -- -D warnings
     - name: Run clippy on Windows installer custom action library
+      # Instrument coverage flag doesn't seem to be supported in windows?
+      env:
+        RUSTFLAGS: ""
       run: |
         cargo clippy --locked --target x86_64-pc-windows-gnu --manifest-path service/windows/installer/custom-actions/Cargo.toml --all -- -D warnings
     - name: Test Rust crates (without extra features)
@@ -271,3 +286,22 @@ jobs:
     - name: Test Rust crates (with feature 'network_dump')
       run: |
         cargo test --manifest-path concordium-node/Cargo.toml --all --features=network_dump
+    
+    # WIP: coverage reporting:
+    - name: Check for .profraw files
+      run: |
+        find . -type f -name "*.profraw"
+    - name: Install cargo-llvm-cov
+      run: |
+        cargo +stable install cargo-llvm-cov --locked
+    - name: Run llvm-cov to produce lcov files
+      run: |
+        cargo llvm-cov --manifest-path concordium-node/Cargo.toml --workspace --lcov --output-path lcov.info
+    - name: Upload coverage to Codecov
+      # Options documented here: https://github.com/codecov/codecov-action
+      uses: codecov/codecov-action@v5
+      with:
+        files: lcov.info
+        fail_ci_if_error: false
+
+      
\ No newline at end of file