Build script

This post was translated from Korean into English by AI.

I created a Docker build script that is useful for building small projects.

Usage

Create a build script like the one below.

#!/bin/bash
shopt -s expand_aliases
alias build='curl -sSL l.ist.sh/b | node - build'

# Build images
export BACKEND_IMAGE=`build backend se.ction.link/blog-backend`
export FRONTEND_IMAGE=`build frontend se.ction.link/blog-frontend`

# Deploy with envsubst
cat kubernetes/resources.yaml | envsubst | kubectl apply -f -

How it works

• shopt -s expand_aliases enables aliases.
• alias build='curl -sSL l.ist.sh/b | node - build' creates the build command. This command retrieves the build script from my personal server and runs it.
• The build <directory> <registry> command works as follows:
  1. It reads every file in the directory directory and calculates a hash.
  2. It uses the directory hash as the tag to create the image name.
  3. It checks the automatically generated cache under the tmp directory to determine whether the image exists.
  4. If the image does not exist, it builds the image with docker buildx.
  5. It pushes the image.
  6. It writes the image name to stdout.
• It reads the Kubernetes resource file and substitutes environment variables using envsubst.
• It deploys the substituted file with kubectl.