matrix-docker-ansible-deploy/roles/custom/matrix-postgres/tasks/migrate_db_to_postgres.yml

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---
- name: Fail if Postgres not enabled
ansible.builtin.fail:
msg: "Postgres via the matrix-postgres role is not enabled (`matrix_postgres_enabled`). Cannot migrate."
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when: "not matrix_postgres_enabled | bool"
- name: Fail if util called incorrectly (missing matrix_postgres_db_migration_request)
ansible.builtin.fail:
msg: "The `matrix_postgres_db_migration_request` variable needs to be provided to this util."
when: "matrix_postgres_db_migration_request is not defined"
- name: Fail if util called incorrectly (invalid matrix_postgres_db_migration_request)
ansible.builtin.fail:
msg: "The `matrix_postgres_db_migration_request` variable needs to contain `{{ item }}`."
with_items:
- src
- dst
- caller
- engine_variable_name
- systemd_services_to_stop
when: "item not in matrix_postgres_db_migration_request"
- name: Check if the provided source database file exists
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ansible.builtin.stat:
path: "{{ matrix_postgres_db_migration_request.src }}"
register: matrix_postgres_db_migration_request_src_stat_result
- name: Fail if provided source database file doesn't exist
ansible.builtin.fail:
msg: "File cannot be found on the server at {{ matrix_postgres_db_migration_request.src }}"
when: "not matrix_postgres_db_migration_request_src_stat_result.stat.exists"
- when: "matrix_postgres_pgloader_container_image_self_build | bool"
block:
- name: Ensure pgloader repository is present on self-build
ansible.builtin.git:
repo: "{{ matrix_postgres_pgloader_container_image_self_build_repo }}"
dest: "{{ matrix_postgres_pgloader_container_image_self_build_src_path }}"
version: "{{ matrix_postgres_pgloader_container_image_self_build_repo_branch }}"
force: "yes"
become: true
become_user: "{{ matrix_user_username }}"
register: matrix_postgres_pgloader_git_pull_results
# If `stable` is used, we hit an error when processing /opt/src/pgloader/build/quicklisp/dists/quicklisp/software/uax-15-20201220-git/data/CompositionExclusions.txt:
# > the octet sequence #(194) cannot be decoded
#
# The issue is described here and is not getting fixed for months: https://github.com/dimitri/pgloader/pull/1179
#
# Although we're not using the dimitri/pgloader image, the one we're using suffers from the same problem.
- name: Switch pgloader base image from Debian stable (likely 10.x/Buster) to Bullseye
ansible.builtin.lineinfile:
path: "{{ matrix_postgres_pgloader_container_image_self_build_src_path }}/Dockerfile"
regexp: "{{ item.match }}"
line: "{{ item.replace }}"
with_items:
- match: '^FROM debian:stable-slim as builder$'
replace: 'FROM debian:bullseye-slim as builder'
- match: '^FROM debian:stable-slim$'
replace: 'FROM debian:bullseye-slim'
- name: Ensure pgloader Docker image is built
community.docker.docker_image:
name: "{{ matrix_postgres_pgloader_docker_image }}"
source: build
force_source: "{{ matrix_postgres_pgloader_git_pull_results.changed if ansible_version.major > 2 or ansible_version.minor >= 8 else omit }}"
force: "{{ omit if ansible_version.major > 2 or ansible_version.minor >= 8 else matrix_postgres_pgloader_git_pull_results.changed }}"
build:
dockerfile: Dockerfile
path: "{{ matrix_postgres_pgloader_container_image_self_build_src_path }}"
pull: true
- name: Ensure pgloader Docker image is pulled
community.docker.docker_image:
name: "{{ matrix_postgres_pgloader_docker_image }}"
source: "{{ 'pull' if ansible_version.major > 2 or ansible_version.minor > 7 else omit }}"
force_source: "{{ matrix_postgres_pgloader_docker_image_force_pull if ansible_version.major > 2 or ansible_version.minor >= 8 else omit }}"
force: "{{ omit if ansible_version.major > 2 or ansible_version.minor >= 8 else matrix_postgres_pgloader_docker_image_force_pull }}"
when: "not matrix_postgres_pgloader_container_image_self_build"
# Defaults
- name: Set postgres_start_wait_time, if not provided
ansible.builtin.set_fact:
postgres_start_wait_time: 15
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when: "postgres_start_wait_time | default('') == ''"
# Actual import work
# matrix-postgres is most likely started already
- name: Ensure matrix-postgres is started
ansible.builtin.service:
name: matrix-postgres
state: started
daemon_reload: true
register: matrix_postgres_service_start_result
- name: Wait a bit, so that Postgres can start
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ansible.builtin.wait_for:
timeout: "{{ postgres_start_wait_time }}"
delegate_to: 127.0.0.1
become: false
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when: "matrix_postgres_service_start_result.changed | bool"
# We only stop services here, leaving it to the caller to start them later.
#
# We can't start them, because they probably need to be reconfigured too (changing the configuration from using SQLite to Postgres, etc.),
# before starting.
#
# Since the caller will be starting them, it might make sense to leave stopping to it as well.
# However, we don't do it, because it's simpler having it here, and it also gets to happen only if we'll be doing an import.
# If we bailed out (somewhere above), nothing would have gotten stopped. It's nice to leave this running in such cases.
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- name: Ensure systemd services blocking the database import are stopped
ansible.builtin.service:
name: "{{ item }}"
state: stopped
failed_when: false
with_items: "{{ matrix_postgres_db_migration_request.systemd_services_to_stop }}"
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- name: Import {{ matrix_postgres_db_migration_request.engine_old }} database from {{ matrix_postgres_db_migration_request.src }} into Postgres # noqa name[template]
ansible.builtin.command:
cmd: >-
{{ matrix_host_command_docker }} run
--rm
--user={{ matrix_user_uid }}:{{ matrix_user_gid }}
--cap-drop=ALL
--network={{ matrix_docker_network }}
--mount type=bind,src={{ matrix_postgres_db_migration_request.src }},dst=/in.db,ro
--entrypoint=/bin/sh
{{ matrix_postgres_pgloader_docker_image }}
-c
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'pgloader {{ matrix_postgres_db_migration_request.pgloader_options | default([]) | join(' ') }} /in.db {{ matrix_postgres_db_migration_request.dst }}'
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register: matrix_postgres_migrate_db_to_postgres_import_result
changed_when: matrix_postgres_migrate_db_to_postgres_import_result.rc == 0
- when: "matrix_postgres_db_migration_request.additional_psql_statements_list | default([]) | length > 0"
block:
- ansible.builtin.import_role:
name: custom/matrix-postgres
tasks_from: detect_existing_postgres_version
- ansible.builtin.set_fact:
matrix_postgres_docker_image_to_use: "{{ matrix_postgres_docker_image_latest if matrix_postgres_detected_version_corresponding_docker_image == '' else matrix_postgres_detected_version_corresponding_docker_image }}"
- name: Execute additional Postgres SQL migration statements
ansible.builtin.command:
cmd: >-
{{ matrix_host_command_docker }} run
--rm
--user={{ matrix_user_uid }}:{{ matrix_user_gid }}
--cap-drop=ALL
--env-file={{ matrix_postgres_base_path }}/env-postgres-psql
--network={{ matrix_docker_network }}
{{ matrix_postgres_docker_image_to_use }}
psql --host=matrix-postgres --dbname={{ matrix_postgres_db_migration_request.additional_psql_statements_db_name }} --command='{{ item }}'
with_items: "{{ matrix_postgres_db_migration_request.additional_psql_statements_list }}"
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register: matrix_postgres_migrate_db_to_postgres_additional_queries_result
changed_when: matrix_postgres_migrate_db_to_postgres_additional_queries_result.rc == 0
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- name: Archive {{ matrix_postgres_db_migration_request.engine_old }} database ({{ matrix_postgres_db_migration_request.src }} -> {{ matrix_postgres_db_migration_request.src }}.backup) # noqa name[template]
ansible.builtin.command:
cmd: "mv {{ matrix_postgres_db_migration_request.src }} {{ matrix_postgres_db_migration_request.src }}.backup"
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register: matrix_postgres_migrate_db_to_postgres_move_result
changed_when: matrix_postgres_migrate_db_to_postgres_move_result.rc == 0
- name: Inject result
ansible.builtin.set_fact:
matrix_playbook_runtime_results: |
{{
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matrix_playbook_runtime_results | default([])
+
[
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"NOTE: Your {{ matrix_postgres_db_migration_request.engine_old }} database file has been imported into Postgres. The original database file has been moved from `{{ matrix_postgres_db_migration_request.src }}` to `{{ matrix_postgres_db_migration_request.src }}.backup`. When you've confirmed that the import went well and everything works, you should be able to safely delete this file."
]
}}