Refactor internals (#14)

.github/workflows/self-test-multistage-docker-build.yml

@@ -42,6 +42,7 @@ jobs:
  stages: env, configured
  testenv-stage: testenv
  server-stage: server
+ quiet: false
 
  test:
  name: 'test'
@@ -83,3 +84,4 @@ jobs:
  run: |
  echo "Server: ${{ steps.build.outputs.server-tag }}"
  echo "Testenv: ${{ steps.build.outputs.testenv-tag }}"
+ echo "Commit: ${{ steps.build.outputs.commit }}"

src/helpers.ts

@@ -1,4 +1,5 @@
 import * as core from '@actions/core'
+import { exec } from '@actions/exec'
 import * as github from '@actions/github'
 
 // Returns a string like "refs_pull_1_merge-bk1"
@@ -51,3 +52,58 @@ export function getAllStages(): string[] {
  }
  return stages
 }
+
+/**
+ * Takes the build stage and returns an untagged image name for it
+ */
+function getUntaggedImageForStage(stage: string): string {
+ const repo = core.getInput('repository')
+ return `${repo}/${stage}`
+}
+
+export function getTaggedImageForStage(stage: string, tag: string): string {
+ const image = getUntaggedImageForStage(stage)
+ return `${image}:${tag}`
+}
+
+type DockerCommand = 'pull' | 'push' | 'build' | 'tag'
+
+interface ExecResult {
+ exitCode: number
+ stderr: string
+ stdout: string
+}
+
+/**
+ * Runs a docker command and returns the output. Unlike exec.exec, this does
+ * not throw on a nonzero exit code.
+ */
+export async function runDockerCommand(command: DockerCommand, ...args: string[]): Promise<ExecResult> {
+ let rest: string[] = [command]
+ if (core.getBooleanInput('quiet')) {
+ rest.push('--quiet')
+ }
+ rest.push(...args)
+
+ let stdout = ''
+ let stderr = ''
+
+ const execOptions = {
+ ignoreReturnCode: true, // Will do manual error handling
+ listeners: {
+ stderr: (data: Buffer) => {
+ stderr += data.toString()
+ },
+ stdout: (data: Buffer) => {
+ stdout += data.toString()
+ },
+ }
+ }
+ const exitCode = await exec('docker', rest, execOptions)
+
+ return {
+ exitCode,
+ stderr,
+ stdout,
+ }
+}