Part 4: Update the Image

Add a command

Install pnpm into the warm image:

src/Sandbox.ts

export const Warm = Modal.Image("Warm", {
  app: Coder,
  from: Node,
  run: ["git clone --depth 1 https://github.com/sindresorhus/is /work"],
  run: ["git clone --depth 1 https://github.com/sindresorhus/is /work", "npm install -g pnpm"],
});

Deploy the new base

pnpm

pnpm alchemy deploy

bun

bun alchemy deploy

npm

npx alchemy deploy

yarn

yarn alchemy deploy

run changed, so Modal builds a new image: it runs the commands again in a fresh sandbox and saves the result. The Worker is unchanged and isn’t redeployed.

pnpm

curl -X POST "$URL/users/ada/run" -d 'pnpm --version'

bun

curl -X POST "$URL/users/ada/run" -d 'pnpm --version'

npm

curl -X POST "$URL/users/ada/run" -d 'pnpm --version'

yarn

curl -X POST "$URL/users/ada/run" -d 'pnpm --version'

Users keep their files

A sandbox that’s already running keeps the image it booted from, until its command exits. Every sandbox started after the deploy boots from the new Warm, and mounts the same user volume, so Ada’s notes are still there, now next to pnpm.

Next

Part 5 tests it.