Ansible:定义命令何时不必运行(从源代码构建ruby)

Question

以下是我的剧本中负责从源代码下载和构建ruby的部分:

  vars:
    ruby_version: '2.0.0-p247'
    ruby_url: 'ftp://ftp.ruby-lang.org//pub/ruby/2.0/ruby-{{ ruby_version }}.tar.gz'

  tasks: 

  - name: Ensure ruby dependencies are installed
    apt: pkg=$item state=installed update-cache=yes
    sudo: yes
    with_items:
      - build-essential
      - git-core
      - libreadline6-dev
      - libyaml-dev
      - libsqlite3-dev
      - sqlite3
      - libgdbm-dev
      - libncurses5-dev
      - libtool
      - bison
      - libffi-dev
      - libdigest-hmac-perl
      - unzip
      - zlib1g
      - zlib1g-dev

  - name: Ensure the ruby source is downloaded
    get_url: url=$ruby_url dest=/home/vagrant/ruby-{{ ruby_version }}.tar

  - name: Ensure the ruby source is extracted
    command: tar -zxf /home/vagrant/ruby-$ruby_version.tar creates=/home/vagrant/ruby-{{ ruby_version }}

  - name: Ensure ruby is installed
    command: $item chdir=/home/vagrant/ruby-$ruby_version
    with_items:
      - ./configure
      - make
      - sudo make install

最后一项任务(配置make和make install)在每次配置时运行.

我可以检查ruby是否已经安装了正确的版本ruby -v.如何在我的剧本中定义这是运行此步骤的条件？

还有,有没有办法让这个条件成为整个任务列表,而不仅仅是最后一个？

Answer 1

您可以使用registertask参数将结果保存ruby -v到变量中,然后使用whentask参数有条件地执行任务.

你的例子看起来像这样:

  vars:
    ruby_version: '2.0.0-p247'
    ruby_url: 'ftp://ftp.ruby-lang.org//pub/ruby/2.0/ruby-{{ ruby_version }}.tar.gz'

  tasks:

  - name: get currently installed ruby version
    command: ruby -v
    register: result
    ignore_errors: True

  - name: Ensure ruby dependencies are installed
    apt: pkg={{ item }} state=installed update-cache=yes
    sudo: yes
    with_items:
      - build-essential
      - git-core
      - libreadline6-dev
      - libyaml-dev
      - libsqlite3-dev
      - sqlite3
      - libgdbm-dev
      - libncurses5-dev
      - libtool
      - bison
      - libffi-dev
      - libdigest-hmac-perl
      - unzip
      - zlib1g
      - zlib1g-dev
    when: result.rc !=0 or result.stdout.split()[1] != ruby_version

  - name: Ensure the ruby source is downloaded
    get_url: url={{ ruby_url }} dest=/home/vagrant/ruby-{{ ruby_version }}.tar
    when: result.rc !=0 or result.stdout.split()[1] != ruby_version

  - name: Ensure the ruby source is extracted
    command: tar -zxf /home/vagrant/ruby-{{ ruby_version }}.tar creates=/home/vagrant/ruby-{{ ruby_version }}
    when: result.rc !=0 or result.stdout.split()[1] != ruby_version

  - name: Ensure ruby is installed
    command: $item chdir=/home/vagrant/ruby-{{ ruby_version }}
    with_items:
      - ./configure
      - make
      - sudo make install
    when: result.rc !=0 or result.stdout.split()[1] != ruby_version

您还可以将任务移动到单独的文件(例如,install_ruby_from_source.yaml),然后有条件地包含该文件:

  vars:
    ruby_version: '2.0.0-p247'
    ruby_url: 'ftp://ftp.ruby-lang.org//pub/ruby/2.0/ruby-{{ ruby_version }}.tar.gz'

  tasks:

  - name: get currently installed ruby version
    command: ruby -v
    register: result
    ignore_errors: True

  - include: /path/to/install_ruby_from_source.yaml
    when: result.rc !=0 or result.stdout.split()[1] != ruby_version