setup-uv/src/download/checksum/update-known-checksums.ts

import {promises as fs} from 'fs'
import * as tc from '@actions/tool-cache'
export async function updateChecksums(
  filePath: string,
  downloadUrls: string[]
): Promise<void> {
  await fs.rm(filePath)
  await fs.appendFile(
    filePath,
    '// AUTOGENERATED_DO_NOT_EDIT\nexport const KNOWN_CHECKSUMS: {[key: string]: string} = {\n'
  )
  let firstLine = true
  for (const downloadUrl of downloadUrls) {
    const content = await downloadAssetContent(downloadUrl)
    const checksum = content.split(' ')[0].trim()
    const key = getKey(downloadUrl)
    if (!firstLine) {
      await fs.appendFile(filePath, ',\n')
    }
    await fs.appendFile(filePath, `  '${key}':\n    '${checksum}'`)
    firstLine = false
  }
  await fs.appendFile(filePath, '}\n')
}

function getKey(downloadUrl: string): string {
  // https://github.com/astral-sh/uv/releases/download/0.3.2/uv-aarch64-apple-darwin.tar.gz.sha256
  const parts = downloadUrl.split('/')
  const fileName = parts[parts.length - 1]
  const name = fileName.split('.')[0].split('uv-')[1]
  const version = parts[parts.length - 2]
  return `${name}-${version}`
}

async function downloadAssetContent(downloadUrl: string): Promise<string> {
  const downloadPath = await tc.downloadTool(downloadUrl)
  const content = await fs.readFile(downloadPath, 'utf8')
  return content
}