deploy-git.yml

---
- hosts: 127.0.0.1
  connection: local

  vars:
    repo_root: "{{ deploy_repo_root | default('/var/www/html') }}"
    drupal_root: "{{ deploy_drupal_root | default([repo_root, '/drupal'] | join) }}"
    git_branch: "{{ deploy_git_branch | default }}"
    git_tag: "{{ deploy_git_tag | default }}"
    sql_dump_timeout: "{{ drush_sqldump_timeout | default(120) }}"

  tasks:
    - name: Ensure a deploy branch XOR tag is defined
      ansible.builtin.assert:
        that: >-
          (git_branch and not git_tag)
          or
          (not git_branch and git_tag)
        msg: "A deploy branch xor tag MUST be defined!"

    - block:
        - name: Git - Get current remote URL
          ansible.builtin.command:
            cmd: git remote get-url origin
            chdir: "{{ repo_root }}"
          register: git_remote
          changed_when: false
        - ansible.builtin.set_fact:
            git_repo_url: "{{ git_remote.stdout }}"
      when: (git_repo_url is undefined) or (git_repo_url == "")

    - name: Git - Ensure no uncommitted changes
      ansible.builtin.command:
        cmd: git status --porcelain --untracked-files=no
        chdir: "{{ repo_root }}"
      register: git_status
      changed_when: false
      failed_when: >
        (git_status.rc != 0) or
        (git_status.stdout_lines | length > 0)

    - name: Git - Fetch
      ansible.builtin.command:
        cmd: git fetch --tags --prune --prune-tags
        chdir: "{{ repo_root }}"
      register: git_fetch
      changed_when: "git_fetch.stdout_lines | length > 0"

    - name: Git - Get current branch
      ansible.builtin.command:
        cmd: git branch --show-current
        chdir: "{{ repo_root }}"
      register: git_branch_show
      changed_when: false

    - name: Git - Get current tag
      ansible.builtin.command:
        cmd: git describe --exact-match --tags
        chdir: "{{ repo_root }}"
      register: git_describe_tags
      changed_when: false
      failed_when:
        - git_describe_tags.rc != 0
        - "'no tag exactly matches' not in git_describe_tags.stderr"

    - ansible.builtin.set_fact:
        git_current_branch: "{{ git_branch_show.stdout | trim }}"
        git_current_tag: "{{ git_describe_tags.stdout | trim }}"

    - ansible.builtin.debug:
        msg: "Current branch is: '{{ git_current_branch | default('N/A') }}'"

    - ansible.builtin.debug:
        msg: "Current tag is: '{{ git_current_tag | default('N/A') }}'"

    - when: git_branch
      block:
        - name: Git - Check for new commits when branch matches
          ansible.builtin.git:
            repo: "{{ git_repo_url }}"
            dest: "{{ repo_root }}"
            version: "{{ git_ref }}"
            update: false
          register: git_check_update
          when: "git_branch == git_current_branch"

        - when: "git_check_update.before == git_check_update.after"
          block:
            - ansible.builtin.debug:
                msg: "Branch already at the latest commit. Commit was: {{ git_check_update.before }}"
            - ansible.builtin.meta: end_play

    - when: git_tag
      block:
        - when: "git_current_tag == git_tag"
          block:
            - ansible.builtin.debug:
                msg: "Already at the required tag: {{ git_current_tag }}"
            - ansible.builtin.meta: end_play

    - name: Drush - Run backup
      ansible.builtin.shell:
        # We have some trouble with the drush sql:dump command hanging,
        # therefore we addd a "maximun runtime" usint the "timeout" utility.
        # @see: https://github.com/nymedia/internal-operations-support/issues/35
        cmd: timeout "{{ sql_dump_timeout }}"  drush sql:dump --no-ansi --no-interaction
        chdir: "{{ drupal_root }}"
      register: drush_sqldump
      # Because of the "timeout" workaround allow 3 failures before giving up.
      retries: 3
      delay: 10
      until: drush_sqldump.stderr.find("[success]") != -1

    - name: Git - Checkout new version
      ansible.builtin.git:
        repo: "{{ git_repo_url }}"
        dest: "{{ repo_root }}"
        version: "{{ git_tag or git_branch }}"
        update: true
      register: git_checkout

    - name: Composer build
      ansible.builtin.shell:
        cmd: composer build
        chdir: "{{ repo_root }}"
      register: composer_build