--bases-index ignored on charmcraft 3

[carlcsaposs-canonical]

Bug Description

charmcraft pack with --bases-index packs all bases

For example, using charmcraft pack --bases-index 1 with a charmcraft.yaml bases that looks like

bases:
  - name: ubuntu
    channel: "20.04"
    architectures: [amd64]
  - name: ubuntu
    channel: "22.04"
    architectures: [amd64]
  - name: ubuntu
    channel: "22.04"
    architectures: [arm64]

packs base 0 and base 1 instead of just base 1

Only occurs on charmcraft 3, not charmcraft 2

To Reproduce

lxd init --auto
sudo snap install charmcraft --classic
git clone https://github.com/canonical/mysql-router-operator
cd mysql-router-operator/
git checkout 60ad0549c590d48d77d37f83fe8d105f5a182d4a
charmcraft pack -v --bases-index 1

Output shows

Launching managed ubuntu 20.04 instance...
[...]
Packing charm mysql-router_ubuntu-20.04-amd64.charm                                                                                                                                                                                                                               
Packed mysql-router_ubuntu-20.04-amd64.charm                                                                                                                                                                                                                                      
Launching managed ubuntu 22.04 instance... 
[...]
Packing charm mysql-router_ubuntu-22.04-amd64.charm
Packed mysql-router_ubuntu-22.04-amd64.charm

Environment

Ubuntu 22.04.1 LTS

$ snap list
Name              Version        Rev    Tracking         Publisher          Notes
charmcraft        3.2.1          4914   latest/stable    canonical✓         classic
core18            20221027       2620   latest/stable    canonical✓         base
core20            20221027       1695   latest/stable    canonical✓         base
core22            20241001       1663   latest/stable    canonical✓         base
lxd               5.0.1-9dcf35b  23541  5.0/stable/…     canonical✓         -
snapd             2.57.5         17576  latest/stable    canonical✓         snapd

charmcraft.yaml

# Copyright 2022 Canonical Ltd.
# See LICENSE file for licensing details.

type: charm
bases:
  # Whenever "bases" is changed:
  # - Update tests/conftest.py::pytest_configure()
  # - Update .github/workflow/ci.yaml integration-test matrix
  - name: ubuntu
    channel: "20.04"
    architectures: [amd64]
  - name: ubuntu
    channel: "22.04"
    architectures: [amd64]
  - name: ubuntu
    channel: "22.04"
    architectures: [arm64]
parts:
  files:
    plugin: dump
    source: .
    build-packages:
      - git
    override-build: |
      # Workaround to add unique identifier (git hash) to charm version while specification
      # DA053 - Charm versioning
      # (https://docs.google.com/document/d/1Jv1jhWLl8ejK3iJn7Q3VbCIM9GIhp8926bgXpdtx-Sg/edit?pli=1)
      # is pending review.
      python3 -c 'import pathlib; import shutil; import subprocess; git_hash=subprocess.run(["git", "describe", "--always", "--dirty"], capture_output=True, check=True, encoding="utf-8").stdout; file = pathlib.Path("charm_version"); shutil.copy(file, pathlib.Path("charm_version.backup")); version = file.read_text().strip(); file.write_text(f"{version}+{git_hash}")'

      craftctl default
    stage:
      # Exclude requirements.txt file during staging
      # Workaround for https://github.com/canonical/charmcraft/issues/1389 on charmcraft 2
      - -requirements.txt
    prime:
      - charm_version
      - workload_version
  charm:
    build-snaps:
      - rustup
    build-packages:
      - libffi-dev
      - libssl-dev
      - pkg-config
    override-build: |
      rustup default stable

      # Convert subset of poetry.lock to requirements.txt
      curl -sSL https://install.python-poetry.org | python3 -
      /root/.local/bin/poetry export --only main,charm-libs --output requirements.txt

      craftctl default
    stage:
      # Exclude charm_version file during staging
      - -charm_version
    # TODO: enable after https://github.com/canonical/charmcraft/issues/1456 fixed
    charm-strict-dependencies: false
    charm-requirements: [requirements.txt]
    charm-entrypoint: src/machine_charm.py

Relevant log output

charmcraft_output.txt
charmcraft-20241108-113122.844623.log

[syncronize-issues-to-jira]

Thank you for reporting us your feedback!

The internal ticket has been created: https://warthogs.atlassian.net/browse/CRAFT-3670.

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