ansible:如何检查 shell 输出

Question

我是 Ansible(1.9.2)的新手。我想检查当前的 zlib 版本。如果它不是 1.2.8，那么 Ansible 需要从源代码安装它。

检查当前 zlib 版本的命令是

root@node2 zlib-1.2.8]# cat /usr/local/include/zlib.h | grep "#define ZLIB_VERSION" | awk '{print $3}'
"1.2.8

我的 Ansible 代码

 - name: "Check zlib version "
      shell: "cat /usr/local/include/zlib.h | grep \"#define ZLIB_VERSION\" | awk '{print $3}'"
      register: zlib_version
    - name: "Debug result"
      debug: result
    - name: "Build zlib "
      command: "{{ item }} chdir=/home/zlib-1.2.8"
      with_items:
        - "./configure --prefix=/usr/local --shared"
        - make
        - make install
      when: "zlib_version!=1.2.8"

调试打印“hello world”!!!

TASK: [Debug result] ********************************************************** 
ok: [192.168.111.81] => {
    "msg": "Hello world!"
}

如何检查 shell 输出并相应地运行命令。

我改了 debug: var=zlib_version.stdout .它打印

TASK: [Debug result] ********************************************************** 
ok: [192.168.111.81] => {
    "var": {
        "zlib_version.stdout": "\"1.2.8\""
    }
}

但是，现在我需要写 zlib_version.stdout.find ("\"1.2.8\"") == -1 ，两次。是否有一种简单的方法可以让 Ansible 在匹配 zlib_version.stdout.find ("\"1.2.8\"") == -1 时跳过所有命令、shell 和取消归档？ ?

 - name: "Check zlib version "
      shell: "cat /usr/local/include/zlib.h | grep \"#define ZLIB_VERSION\" | awk '{print $3}'"
      ignore_errors: true
      register: zlib_version
    - unarchive: src=/home/files/nigex/zlib-1.2.8.tar.gz   dest=/home/
      when: zlib_version.stdout.find ("\"1.2.8\"") == -1

    - name: "Debug result"
      debug: var=zlib_version.stdout
    - name: "Build zlib "
      command: "{{ item }} chdir=/home/zlib-1.2.8"
      with_items:
        - "./configure --prefix=/usr/local --shared"
        - make
        - make install
      when: zlib_version.stdout.find ("\"1.2.8\"") == -1

Answer 1

shell 命令的输出可通过 stdout 获得属性(property)。所以zlib_version.stdout会给你命令的输出。

- name: "Debug result"
  debug: var=zlib_version.stdout

一个简单的 role可以创建以避免两次写入条件。像这样的东西:

# file roles/zlib/tasks/main.yml
---
- unarchive: src=/home/files/nigex/zlib-1.2.8.tar.gz   dest=/home/

- name: "Build zlib "
  command: "{{ item }} chdir=/home/zlib-1.2.8"
  with_items:
    - "./configure --prefix=/usr/local --shared"
    - make
    - make install

然后仅当条件为真时才包含角色。

# pre_tasks is needed instead of tasks since this needs to be run before the role is included

pre_tasks:
  - name: "Check zlib version "
    shell: "cat /usr/local/include/zlib.h | grep \"#define ZLIB_VERSION\" | awk '{print $3}'"
    ignore_errors: true
    register: zlib_version

roles:
  - { role: zlib, when: "zlib_version.stdout.find ('\"1.2.8\"') == -1" }