verify-exercises-in-docker

#!/usr/bin/env bash

# Synopsis:
# Verify that each exercise's example/exemplar solution passes the tests
# using the track's test runner Docker image.
# You can either verify all exercises or a single exercise.

# Example: verify all exercises in Docker
# bin/verify-exercises-in-docker

# Example: verify single exercise in Docker
# bin/verify-exercises-in-docker two-fer

set -eo pipefail

die() { echo "$*" >&2; exit 1; }

required_tool() {
    command -v "${1}" >/dev/null 2>&1 ||
        die "${1} is required but not installed. Please install it and make sure it's in your PATH."
}

required_tool docker

copy_example_or_examplar_to_solution() {
    jq -c '[.files.solution, .files.exemplar // .files.example] | transpose | map({src: .[1], dst: .[0]}) | .[]' .meta/config.json \
    | while read -r src_and_dst; do
        cp "$(jq -r '.src' <<< "${src_and_dst}")" "$(jq -r '.dst' <<< "${src_and_dst}")"
    done
}

pull_docker_image() {
    # shellcheck disable=SC1083
    docker pull exercism/clojure-test-runner ||
        die $'Could not find the `exercism/clojure-test-runner` Docker image.\nCheck the test runner docs at https://exercism.org/docs/building/tooling/test-runners for more information.'
}

run_tests() {
    local slug
    slug="${1}"

    # shellcheck disable=SC1083
    docker run \
        --rm \
        --network none \
        --read-only \
        --mount type=bind,src="${PWD}",dst=/solution \
        --mount type=bind,src="${PWD}",dst=/output \
        --mount type=tmpfs,dst=/tmp \
        exercism/clojure-test-runner "${slug}" /solution /output
    jq -e '.status == "pass"' "${PWD}/results.json" >/dev/null 2>&1
}

verify_exercise() {
    local dir
    local slug
    local tmp_dir
    dir=$(realpath "${1}")
    slug=$(basename "${dir}")
    tmp_dir=$(mktemp -d -t "exercism-verify-${slug}-XXXXX")

    echo "Verifying ${slug} exercise..."

    (
        trap 'rm -rf "$tmp_dir"' EXIT    # remove tempdir when subshell ends
        cp -r "${dir}/." "${tmp_dir}"
        cd "${tmp_dir}"

        copy_example_or_examplar_to_solution
        run_tests "${slug}"
    )
}

verify_exercises() {
    local exercise_slug
    exercise_slug="${1}"

    shopt -s nullglob
    count=0
    for exercise_dir in ./exercises/{concept,practice}/${exercise_slug}/; do
        if [[ -d "${exercise_dir}" ]]; then
            verify_exercise "${exercise_dir}"
            ((++count))
        fi
    done
    ((count > 0)) || die 'no matching exercises found!'
}

pull_docker_image

exercise_slug="${1:-*}"
verify_exercises "${exercise_slug}"