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(configure make和make install)在每次配置时运行.
我可以检查ruby是否已经使用ruby -v安装了正确的版本.如何在我的剧本中定义这是运行此步骤的条件？
另外,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？
解决方法
您可以使用register task参数将ruby -v的结果保存到变量中,然后使用when task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