Build with runtime python but pip could not find pip

[imaffe]

I'm trying to build an apk with a client tool (pulsar-client), however, I would receive the following error when I run the code with

docker run --privileged --rm -v "${PWD}":/work \
  cgr.dev/chainguard/melange build python-melange.yaml \
  --arch x86,amd64,aarch64,armv7 \
  --signing-key melange.rsa

Exception : importlib.metadata.PackageNotFoundError: No package metadata was found for pip

The file is:

package:
  name: pulsar-python-client
  version: 0.1.0
  description: An custom apk packaing including pulsar python client
  target-architecture:
    - all
  copyright:
    - license: Apache-2.0
      paths:
        - "*"
  dependencies:
    runtime:
      - python3

environment:
  contents:
    repositories:
      - https://dl-cdn.alpinelinux.org/alpine/edge/main
      - https://dl-cdn.alpinelinux.org/alpine/edge/community
    packages:
      - alpine-baselayout-data
      - ca-certificates-bundle
      - busybox
      - gcc
      - musl-dev
      - python3
      - python3-dev
      - py3-pip
      - py3-virtualenv

pipeline:
  - name: install python client
    runs: |
      set -x
      pip install pulsar-client==2.10.2
      pip install pulsar-client[avro]=='2.10.2'
      pip install pulsar-client[functions]=='2.10.2'
      pip install pulsar-client[all]=='2.10.2'

I basically copied the code from https://github.com/chainguard-dev/hello-melange-apko/blob/main/py/melange.yaml, but it's not working.

Can we have an example how to install python?

[tuananh]

maybe try python3 -m pip --version. it seems to be working for me.

[kaniini]

This was most likely due to python migration in Alpine. None the less, this is not an issue specific to Melange and should be directed to Alpine.