ci(code-coverage): Add code coverage in ci

Use of llmv-cov to run test with code coerage.
Add code coverage github page when push to  mian.
Added verb:test-coverage to Makefile to generate report locally.

Signed-off-by: Packit Build <packit@fedoraproject.org>

Author: Packit Build

.github/workflows/ci.yml

@@ -40,16 +40,6 @@ jobs:
     container: fedora:latest
     steps:
       - uses: actions/checkout@v4
-      - name: Cache
-        uses: actions/cache@v3
-        with:
-          path: |
-            ~/.cargo/bin/
-            ~/.cargo/registry/index/
-            ~/.cargo/registry/cache/
-            ~/.cargo/git/db/
-            target/
-          key: ${{ runner.os }}-cargo-clippy-${{ hashFiles('**/Cargo.lock') }}
       - name: Install deps
         run: |
           dnf install -y make gcc git clippy cargo rust
@@ -58,42 +48,54 @@ jobs:
           command: clippy
           args: -- -D warnings -D clippy::panic -D clippy::todo
 
-  build_and_test:
+  build_and_test_with_coverage:
+    name: Build, test with coverage
     runs-on: ubuntu-latest
-    container: 
+    container:
       image: fedora:latest
       options: --user root
+    env:
+      CARGO_TERM_COLOR: always
+      LLVM_COV: /usr/bin/llvm-cov
+      LLVM_PROFDATA: /usr/bin/llvm-profdata
     steps:
       - name: Install deps
         run: |
-          dnf install -y make gcc git cargo rust git grub2-efi grub2-efi-modules shim
+          dnf install -y make gcc git cargo rust git grub2-efi grub2-efi-modules shim llvm
       - uses: actions/checkout@v4
         with:
           persist-credentials: false
       - name: Fix git trust
         run: git config --global --add safe.directory /__w/greenboot-rs/greenboot-rs
-      - name: Cache
-        uses: actions/cache@v3
-        with:
-          path: |
-            ~/.cargo/bin/
-            ~/.cargo/registry/index/
-            ~/.cargo/registry/cache/
-            ~/.cargo/git/db/
-            target/
-          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+      - name: Install cargo-llvm-cov
+        run: cargo install cargo-llvm-cov
       - name: Build
-        uses: actions-rs/cargo@v1
-        with:
-          command: build
-      - name: Run tests with mock mounts
-        uses: actions-rs/cargo@v1
+        run: cargo build
+      - name: Run tests with coverage
+        run: |
+          cargo llvm-cov test -- --test-threads=1
+          cargo llvm-cov report --html --output-dir tests/coverage
+      - name: Upload coverage report (HTML artifact)
+        uses: actions/upload-artifact@v4
         with:
-          command: test
-          args: --features test-remount -- --test-threads=1
-      - name: Run mount logic tests
-        uses: actions-rs/cargo@v1
+          name: coverage-report
+          path: tests/coverage/
+          retention-days: 14
+      - name: Upload coverage report (GitHub Pages)
+        if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+        uses: actions/upload-pages-artifact@v3
         with:
-          command: test
-          # matches 2 remount tests
-          args: test_remount_boot   
+          path: tests/coverage/
+
+  deploy-pages:
+    name: Deploy coverage to GitHub Pages
+    needs: build_and_test
+    if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+    runs-on: ubuntu-latest
+    permissions:
+      pages: write
+      id-token: write
+    environment: github-pages
+    steps:
+      - name: Deploy to GitHub Pages
+        uses: actions/deploy-pages@v4

.gitignore

@@ -7,6 +7,8 @@
 debug/
 target/
 rpmbuild/
+tests/coverage/
+vendor/
 
 Cargo.lock
 *.json

Makefile

@@ -6,6 +6,11 @@ VERSION = $(shell grep -oP '^Version:\s+\K\S+' greenboot-rs.spec)
 COMMIT = $(shell (cd "$(SRCDIR)" && git rev-parse --short HEAD))
 TIMESTAMP = $(shell date +%Y%m%d%H%M%S)
 PLATFORMS = $(shell (echo {x86_64,aarch64,powerpc64le,s390x}-unknown-linux-gnu))
+
+LLVM_COV ?= /usr/bin/llvm-cov
+LLVM_PROFDATA ?= /usr/bin/llvm-profdata
+COVERAGE_OUTPUT_DIR ?= tests/coverage
+CARGO_LLVM_COV ?= $(shell command -v cargo-llvm-cov 2>/dev/null)
 GREENBOOT_RUST_DEPENDENCIES = rust-anyhow+default-devel \
 				rust-clap+derive-devel \
 				rust-clap+default-devel \
@@ -83,6 +88,20 @@ build:
 check:
 	cargo test "--target-dir=${TARGETDIR}" ${CARGO_ARGS}
 
+.PHONY: test-coverage
+test-coverage:
+	@if [ ! -x "$(LLVM_COV)" ] || [ ! -x "$(LLVM_PROFDATA)" ]; then \
+		echo "ERROR: llvm-cov or llvm-profdata not found"; \
+		echo "  Install it with: sudo dnf install llvm"; \
+		exit 1; \
+	fi
+
+	@echo "Running test coverage (results will be in $(COVERAGE_OUTPUT_DIR))..."
+	sudo LLVM_COV=$(LLVM_COV) LLVM_PROFDATA=$(LLVM_PROFDATA) cargo llvm-cov test -- --test-threads=1
+	sudo LLVM_COV=$(LLVM_COV) LLVM_PROFDATA=$(LLVM_PROFDATA) cargo llvm-cov report --html --output-dir $(COVERAGE_OUTPUT_DIR)
+	sudo chmod -R 777 $(COVERAGE_OUTPUT_DIR)
+	@echo "Coverage report generated at $(COVERAGE_OUTPUT_DIR)/html/index.html"
+
 .PHONY: fmt
 fmt:
 	cargo fmt