setup-ruby/common.js

const os = require('os')
const fs = require('fs')

export function getVirtualEnvironmentName() {
  const platform = os.platform()
  if (platform === 'linux') {
    return `ubuntu-${findUbuntuVersion()}`
  } else if (platform === 'darwin') {
    return 'macos-latest'
  } else if (platform === 'win32') {
    return 'windows-latest'
  } else {
    throw new Error(`Unknown platform ${platform}`)
  }
}

function findUbuntuVersion() {
  const lsb_release = fs.readFileSync('/etc/lsb-release', 'utf8')
  const match = lsb_release.match(/^DISTRIB_RELEASE=(\d+\.\d+)$/m)
  if (match) {
    return match[1]
  } else {
    throw new Error('Could not find Ubuntu version')
  }
}