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Slavi PantaleevandClaude Opus 5
db4eb94058
The scenarios worked around Postgres 18's data layout change by mounting the tmpfs at /var/lib/postgresql. The postgres role solved the same problem differently and better, when it bit us there: it sets PGDATA explicitly, and to /data rather than anywhere beneath /var/lib/postgresql, because that path is a VOLUME in the official image and nothing can be mounted under it. Doing the same here means the scenarios exercise the layout the role actually deploys, and that a future image changing its own default cannot move the data directory out from under them. Ref: https://github.com/docker-library/postgres/pull/1259 Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01SEH3vxYSQ5SV4N5z61eyGT
79 lines
3.3 KiB
YAML
79 lines
3.3 KiB
YAML
# SPDX-FileCopyrightText: 2026 Slavi Pantaleev
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#
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# SPDX-License-Identifier: AGPL-3.0-or-later
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---
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# Stands up Postgres on a container network, for scenarios whose role has a database.
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#
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# Include from a scenario's prepare.yml:
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#
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# - name: Ensure Postgres is running
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# ansible.builtin.include_tasks:
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# file: "{{ lookup('env', 'MOLECULE_PROJECT_DIRECTORY') }}/../../../molecule-shared/tasks/postgres.yml"
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# vars:
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# molecule_shared_postgres_network: "{{ <role>_container_network }}"
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# molecule_shared_postgres_database: matrix_<role>
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# molecule_shared_postgres_username: matrix_<role>
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# molecule_shared_postgres_password: <something>
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#
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# The role should then be pointed at it with its own `_database_engine: postgres` and
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# `_database_hostname: matrix-postgres-molecule` (or whatever hostname is passed here).
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#
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# This is what the playbook does in a real run: `group_vars/matrix_servers` selects postgres
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# whenever postgres is enabled, which is the default. sqlite is the path almost nobody uses.
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- name: Ensure a previous Postgres is gone
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ansible.builtin.command:
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argv:
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- docker
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- rm
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- --force
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- "{{ molecule_shared_postgres_name | default('matrix-postgres-molecule') }}"
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register: molecule_shared_postgres_removal
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changed_when: molecule_shared_postgres_removal.rc == 0
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failed_when: false
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- name: Ensure Postgres is running
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ansible.builtin.command:
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argv:
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- docker
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- run
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- --detach
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- --name={{ molecule_shared_postgres_name | default('matrix-postgres-molecule') }}
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- --network={{ molecule_shared_postgres_network }}
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- --network-alias={{ molecule_shared_postgres_hostname | default('matrix-postgres-molecule') }}
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- --env=POSTGRES_DB={{ molecule_shared_postgres_database }}
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- --env=POSTGRES_USER={{ molecule_shared_postgres_username }}
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- --env=POSTGRES_PASSWORD={{ molecule_shared_postgres_password }}
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# PGDATA is set explicitly, and to /data rather than anywhere under
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# /var/lib/postgresql, for the same reasons the postgres role does it: v18 changed the
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# default to a versioned subdirectory, and /var/lib/postgresql is a VOLUME in the image,
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# so nothing can be mounted beneath it. Setting it explicitly also means a future image
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# changing its own default cannot move the data out from under this.
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#
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# A tmpfs, because the database is thrown away with the container and not writing it to
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# the overlay filesystem is faster.
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- --env=PGDATA=/data
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- --tmpfs=/data
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- "{{ molecule_shared_image_postgres }}"
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register: molecule_shared_postgres_start
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changed_when: molecule_shared_postgres_start.rc == 0
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# `pg_isready` needs the username: it defaults to the OS user of whoever runs it, which inside
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# this container is `postgres` and may not be the role the scenario created.
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- name: Wait for Postgres to accept connections
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ansible.builtin.command:
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argv:
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- docker
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- exec
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- "{{ molecule_shared_postgres_name | default('matrix-postgres-molecule') }}"
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- pg_isready
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- --username={{ molecule_shared_postgres_username }}
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- --dbname={{ molecule_shared_postgres_database }}
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- --quiet
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register: molecule_shared_postgres_ready
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changed_when: false
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until: molecule_shared_postgres_ready.rc == 0
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retries: 30
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delay: 2
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