功能：解压缩，这个模块有两种用法：

1、将ansible主机上的压缩包在本地解压缩后传到远程主机上，这种情况下，copy=yes.   本地解压缩,解压缩位置不是默认的目录,没找到或传完删了      后传到远程主机

2、将远程主机上的某个压缩包解压缩到指定路径下。这种情况下，需要设置copy=no     远程主机上面的操作,不涉及ansible服务端

参数：

copy：默认为yes，当copy=yes，那么拷贝的文件是从ansible主机复制到远程主机上的，如果设置为copy=no，那么会在远程主机上寻找src源文件

src：源路径，可以是ansible主机上的路径，也可以是远程主机上的路径，如果是远程主机上的路径，则需要设置copy=no

dest：远程主机上的目标路径

mode：设置解压缩后的文件权限

#ansible-doc unarchive
> UNARCHIVE

  The [unarchive] module copies an archive file from the local machine
  to a remote and unpacks it.

Options (= is mandatory):

- copy
        Should the file be copied from the local to the remote
        machine? (Choices: yes, no) [Default: yes]

- creates
        a filename, when it already exists, this step will *not* be
        run. [Default: None]

= dest
        Remote absolute path where the archive should be unpacked
        [Default: None]

= src
        Local path to archive file to copy to the remote server; can
        be absolute or relative. [Default: None]

Notes:  requires `tar'/`unzip' command on target hostcan handle `gzip',
        `bzip2' and `xz' compressed as well as uncompressed tar
        filesdetects type of archive automaticallyuses tar's `--diff
        arg' to calculate if changed or not. If this `arg' is not
        supported, it will always unpack the archivedoes not detect if
        a .zip file is different from destination - always
        unzipsexisting files/directories in the destination which are
        not in the archive are not touched.  This is the same behavior
        as a normal archive extractionexisting files/directories in
        the destination which are not in the archive are ignored for
        purposes of deciding if the archive should be unpacked or not

# Example from Ansible Playbooks
- unarchive: src=foo.tgz dest=/var/lib/foo

# Unarchive a file that is already on the remote machine

- unarchive: src=/tmp/foo.zip dest=/usr/local/bin copy=no

unarchive模块 http://docs.ansible.com/ansible/latest/modules/unarchive_module.html