src/producer.rs:544: No input files found

[J4CKVVH173]

I try to configurate gitlab ci-cd for rust and I would like to have a test's coverage. I used the instruction from grcov but when I try to run grcov target/coverage --binary-path target/debug -s . -o target/coverage --keep-only 'src/*' --output-types html,cobertura I get this rust's panic message: A panic occurred at /home/user/.cargo/registry/src/index.crates.io-6f17d22bba15001f/grcov-0.8.19/src/producer.rs:544: No input files found.
I can't understand where I messed up.

Full gitlab-ci sript body

  variables:
    LLVM_PROFILE_FILE: "target/coverage/%p-%m.profraw"
  script:
    - apt update
    - apt upgrade -y
    - apt install -y pkg-config libssl-dev
    - cargo test

    - mkdir target/coverage
    - cargo install grcov
    - grcov target/coverage --binary-path target/debug -s . -o target/coverage --keep-only 'src/*' --output-types html,cobertura
    # Extract just the top-level coverage number from the XML report.
    - xmllint --xpath "concat('Coverage:\ ', 100 * string(//coverage/@line-rate), '%')" target/coverage/cobertura.xml

[ktbrennan28]

Hey, I am having the same issue with a Windows environment. Were you able to resolve this?

[richard-mck]

I found I need to follow the full set of instructions not just the gitlab-specific elements.

I'm using an image with grcov pre-installed. My CI job works as expected, here's what it looks like:

cargo coverage:
  stage: test
  variables:
    CARGO_TEST_OPTS: "--workspace"
    TEST_BIN_ARGS: ""
    LLVM_PROFILE_FILE: "target/coverage/%p-%m.profraw"
    RUSTFLAGS: "-Cinstrument-coverage"
  script:
    - mkdir -p target/coverage
    - rustup component add llvm-tools-preview
    - cargo build
    - cargo test ${CARGO_TEST_OPTS} -- ${TEST_BIN_ARGS}
    - grcov target/coverage -b target/debug -o target/coverage --output-types cobertura
  artifacts:
    paths:
      - target/coverage
    reports:
      coverage_report:
        coverage_format: cobertura
        path: target/coverage/cobertura.xml

Without the build step, the profraw files weren't getting generated.

[J4CKVVH173]

I've found out that it's important to add extra keys to rust test runner and after this grcov worked

LLVM_PROFILE_FILE='target/coverage/%p-%m.profraw' RUSTFLAGS='-C instrument-coverage' cargo test - test runner for Docker rust:1.71