ImageDetector.ts

import * as exec from 'actions-exec-listener'
import * as core from '@actions/core'

export class ImageDetector {
  async getExistingImages(): Promise<string[]> {
    const existingSet = new Set<string>([])
    const ids = (await exec.exec(`docker image ls -q`, [], { silent: true, listeners: { stderr: console.warn }})).stdoutStr.split(`\n`).filter(id => id !== ``)
    const repotags = await this.getExistingImageIdentifiers()
    core.debug(JSON.stringify({ log: "getExistingImages", ids, repotags }));
    ([...ids, ...repotags]).forEach(image => existingSet.add(image))
    core.debug(JSON.stringify({ existingSet }))
    return Array.from(existingSet)
  }

  async getExistingImageIdentifiers(): Promise<string[]> {
    return (
        await exec.exec(
          `docker`, `image ls --format {{.Repository}}:{{.Tag}}:{{.ID}} --filter dangling=false`.split(' '),
          { silent: true, listeners: { stderr: console.warn }}
        )
      )
        .stdoutStr
        .split(`\n`)
        .filter(img => img !== ``)
        .map(img => {
          const [repository, tag, id] = img.split(':')
          return (tag == '<none>' ? id : `${repository}:${tag}`)
        })
  }

  async getImagesShouldSave(alreadRegisteredImages: string[]): Promise<string[]> {
    const resultSet = new Set(await this.getExistingImages())
    alreadRegisteredImages.forEach(image => resultSet.delete(image))
    return Array.from(resultSet)
  }
}