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#!/usr/bin/env node

const fs = require('fs');

const path = require('path');

// Grab last git commit

function getCommitHasForPath(path) {

return require('child_process')

.execSync(`git log -1 --format=%H HEAD -- ${path}`)

.toString().trim()

}

const stackbrewPath = path.basename(__filename);

// Header

let stackbrew = `# this file is generated via https://github.com/nodejs/docker-node/blob/${getCommitHasForPath(stackbrewPath)}/${stackbrewPath}

Maintainers: The Node.js Docker Team <https://github.com/nodejs/docker-node> (@nodejs)

GitRepo: https://github.com/nodejs/docker-node.git

GitFetch: refs/heads/main\n`;

// Loop versions

const config = require('./versions.json');

const versions = Object.keys(config).reverse()

let midnight = new Date()

midnight.setHours(0, 0, 0, 0)

const now = midnight.getTime()

const aplineRE = new RegExp(/alpine*/);

const slimRE = new RegExp(/\*-slim/);

let foundLTS = false;

let foundCurrent = false;

for (version of versions) {

let lts = new Date(`${config[version].lts}T00:00:00.00`).getTime();

let maintenance = new Date(`${config[version].maintenance}T00:00:00.00`).getTime();

let isCurrent = foundCurrent ? false : isNaN(lts) || lts >= now;

foundCurrent = isCurrent || foundCurrent;

let isLTS = foundLTS ? false : (now >= lts);

foundLTS = isLTS || foundLTS;

let codename = config[version].codename

let defaultAlpine = config[version]['alpine-default']

let defaultDebian = config[version]['debian-default']

let variants = config[version].variants

let fullversion;

for (variant in variants) {

let dockerfilePath = path.join(version, variant, 'Dockerfile');

let isAlpine = aplineRE.test(variant)

let isSlim = slimRE.test(variant)

let isDefaultSlim = new RegExp(`${defaultDebian}-slim`).test(variant)

// Get full version from the Dockerfile

let dockerfile = fs.readFileSync(dockerfilePath, 'utf-8')

fullversion = dockerfile.match(/ENV NODE_VERSION=(?<major>\d+)\.(?<minor>\d+)\.(?<patch>\d+)/)

let tags = [

`${fullversion.groups.major}.${fullversion.groups.minor}.${fullversion.groups.patch}-${variant}`,

`${fullversion.groups.major}.${fullversion.groups.minor}-${variant}`,

`${fullversion.groups.major}-${variant}`,

]

if (codename) {

tags.push(`${codename}-${variant}`)

}

if (variant === defaultAlpine) {

tags.push(`${fullversion.groups.major}.${fullversion.groups.minor}.${fullversion.groups.patch}-alpine`)

tags.push(`${fullversion.groups.major}.${fullversion.groups.minor}-alpine`)

tags.push(`${fullversion.groups.major}-alpine`)

if (codename) {

tags.push(`${codename}-alpine`)

}

}

if (variant === defaultDebian) {

tags.push(`${fullversion.groups.major}.${fullversion.groups.minor}.${fullversion.groups.patch}`)

tags.push(`${fullversion.groups.major}.${fullversion.groups.minor}`)

tags.push(`${fullversion.groups.major}`)

if (isSlim) {

tags.push(`${fullversion.groups.major}.${fullversion.groups.minor}.${fullversion.groups.patch}-slim`)

tags.push(`${fullversion.groups.major}.${fullversion.groups.minor}-slim`)

tags.push(`${fullversion.groups.major}-slim`)

}

if (codename) {

tags.push(`${codename}`)

}

}

if (isDefaultSlim) {

tags.push(`${fullversion.groups.major}.${fullversion.groups.minor}.${fullversion.groups.patch}-slim`)

tags.push(`${fullversion.groups.major}.${fullversion.groups.minor}-slim`)

tags.push(`${fullversion.groups.major}-slim`)

if (codename) {

tags.push(`${codename}-slim`)

}

}

if (isCurrent) {

if (variant === defaultAlpine) {

tags.push(variant)

tags.push(`${fullversion.groups.major}.${fullversion.groups.minor}.${fullversion.groups.patch}-alpine`)

tags.push(`${fullversion.groups.major}.${fullversion.groups.minor}-alpine`)

tags.push(`${fullversion.groups.major}-alpine`)

tags.push('alpine')

tags.push('current-alpine')

}

if (variant === defaultDebian) {

tags.push(variant)

tags.push('latest')

tags.push('current')

}

if (isAlpine) {

tags.push(`${variant}`)

tags.push(`current-${variant}`)

}

if (!isAlpine) {

tags.push(`${variant}`)

tags.push(`current-${variant}`)

}

if (isDefaultSlim) {

tags.push('slim')

tags.push('current-slim')

}

}

if (isLTS) {

tags.push(`lts-${variant}`)

if (variant === defaultAlpine) {

}

if (variant === defaultDebian) {

tags.push('lts')

if (codename) {

tags.push(`lts-${codename}`)

}

}

if (isDefaultSlim) {

tags.push(`lts-slim`)

}

if (variant === defaultAlpine) {

tags.push(`lts-alpine`)

}

}

// remove duplicates

tags = tags.filter((x, i, a) => a.indexOf(x) == i)

tags = tags.sort()

let directory = `${version}/${variant}`

stackbrew += `\nTags: ${tags.join(', ')}\n`

stackbrew += `Architectures: ${config[version].variants[variant].join(', ')}\n`

stackbrew += `GitCommit: ${getCommitHasForPath(directory)}\n`

stackbrew += `Directory: ${directory}\n`

}

}

// output

console.log(stackbrew)