docker-compose fails in pgvector-vectorstore-example with "The Compose file is invalid" error

[mlliarm]

Hello,

I'm trying to run the example and I'm getting the following:

$ docker-compose up
ERROR: The Compose file is invalid because:
Service db has neither an image nor a build context specified. At least one must be provided.

After a bit of googling I found out that the context is missing from the build in the docker-compose.yml file.

This file currently is:

version: "3.9"
services:
  db:
    build:
      dockerfile: postgres.Dockerfile
    restart: always
    ports:
      - "5432:5432"
    environment:
      POSTGRES_PASSWORD: testpass
      POSTGRES_USER: testuser
      POSTGRES_DB: testdb

When changed to the following docker-compose.yml according to this suggestion

version: "3.9"
services:
  db:
    build:
      context: .
      dockerfile: postgres.Dockerfile
    restart: always
    ports:
      - "5432:5432"
    environment:
      POSTGRES_PASSWORD: testpass
      POSTGRES_USER: testuser
      POSTGRES_DB: testdb

it works:

$ docker-compose up
Creating network "pgvector-vectorstore-example_default" with the default driver
Building db
DEPRECATED: The legacy builder is deprecated and will be removed in a future release.
            Install the buildx component to build images with BuildKit:
            https://docs.docker.com/go/buildx/

Sending build context to Docker daemon   34.3kB
Step 1/4 : FROM postgres:16
16: Pulling from library/postgres
f11c1adaa26e: Pull complete 
76ce212b9153: Pull complete 
919ca406a058: Pull complete 
...

If you agree I can send a PR with this change.

System

OS information:

• Ubuntu 22.04
• x86_64 Linux 6.5.0-1025-oem

Golang:

• go1.22.1 linux/amd64

Docker:

• Version: 24.0.7
• API version: 1.43
• Go version: go1.21.1
• Git commit: 24.0.7-0ubuntu2~22.04.1
• Built: Wed Mar 13 20:23:54 2024
• OS/Arch: linux/amd64

Docker compose:

• docker-compose version 1.29.2, build unknown
• docker-py version: 5.0.3
• CPython version: 3.10.12
• OpenSSL version: OpenSSL 3.0.2 15 Mar 2022

Cheers.

[elnoro]

Hello,

According to the documentation here: https://docs.docker.com/compose/compose-file/build/#context, the context should already default to ".":

If not set explicitly, context defaults to project directory (.).

However, Compose V1 ("docker-compose") has reached its end-of-life and is no longer supported by Docker. It might be a good idea to update the README to use Compose V2 ("docker compose" without the dash, although Docker Desktop specifically should provide an alias by default). See more here: https://docs.docker.com/compose/migrate/

Thank you!