actions-playground/gen-service-version.mjs

import * as child_process from 'child_process';

const services = ['bar-service', 'foo-service'];

function latestCommitInDirectory(dirname) {
    return String(child_process.execSync(`git log --pretty=format:%H -n 1 -- ${dirname}`));
}

const serviceVersions = {};

const currentCommit = latestCommitInDirectory('.');

for (const service of services) {
    serviceVersions[service] = latestCommitInDirectory(service);
}

console.log(currentCommit);
console.log(serviceVersions);

Object.entries(serviceVersions).forEach(([name, version]) => {
    const skip = version === currentCommit ? 'run' : 'skip';

    console.log(`::set-output name=${name}::${skip}`)
});