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add ansible get vaule from loop register

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Eric Chang
2019-12-27 09:27:45 +08:00
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"description" : "\x3cp\x3e今天在寫一支客製化 firefox 的playbook\x3c\/p\x3e\n\n\x3cp\x3e因為firefox 會給每個user 建立一個由亂數字串組成的default profile\x3c\/p\x3e\n\n\x3cp\x3e所以每個user的 default profile 都不同\x3c\/p\x3e\n\n\x3cp\x3e也因此在用register處理的時候，碰到了一些問題\x3c\/p\x3e",
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<title>[筆記]在ansible中，取得loop register後的值/ Ansible Get Value From Loop Register </title>
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<span class="date">27 December</span> <span> / </span>
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<a href="https://github.com/changchichung" title="Posts by Eric Chang" rel="author">Eric Chang</a>
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<div class='entry-header'>
<h1 class='entry-title'> [筆記]在ansible中，取得loop register後的值/ Ansible Get Value From Loop Register</h1>
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<div class="entry-content">
<article>
<p>今天在寫一支客製化 firefox 的playbook</p>
<p>因為firefox 會給每個user 建立一個由亂數字串組成的default profile</p>
<p>所以每個user的 default profile 都不同</p>
<p>也因此在用register處理的時候，碰到了一些問題</p>
<h3 id="task-內容">TASK 內容</h3>
<p>其實task 內容沒有很複雜，簡單來說，就是先檢查user的 firefox profile 目錄</p>
<p>如果存在就pass，如果不存在就幫user建立</p>
<pre><code>- name: check if user profile exists
become_user: &quot;{{ item.name }}&quot;
stat:
path: &quot;{{ firefox_home }}&quot;
register: profile_exists
with_items: &quot;{{ users }}&quot;
</code></pre>
<p>但是在接下來的task在執行的時候，碰到了問題</p>
<p>ansible 提示說profile_exists 沒有 stat 屬性</p>
<p>用過 stat module 的，應該都知道結果會是 var_name.stat.xxxx 這樣的用法</p>
<p>所以可以肯定的是 stat 這個屬性一定在</p>
<p>可是也一定有什麼問題，造成取不到值</p>
<p>當然就是先debug 來看看(有些不重要的屬性，我就先拿掉了)</p>
<pre><code>ok: [hqdc075] =&gt; {
&quot;profile_exists&quot;: {
&quot;changed&quot;: false,
&quot;msg&quot;: &quot;All items completed&quot;,
&quot;results&quot;: [
{
&quot;ansible_loop_var&quot;: &quot;item&quot;,
&quot;changed&quot;: false,
&quot;failed&quot;: false,
&quot;invocation&quot;: {
&quot;module_args&quot;: {
&quot;checksum_algorithm&quot;: &quot;sha1&quot;,
&quot;follow&quot;: false,
&quot;get_attributes&quot;: true,
&quot;get_checksum&quot;: true,
&quot;get_md5&quot;: false,
&quot;get_mime&quot;: true,
&quot;path&quot;: &quot;/home/changch/.mozilla/firefox&quot;
}
},
&quot;item&quot;: {
&quot;name&quot;: &quot;changch&quot;
},
&quot;stat&quot;: {
&quot;atime&quot;: 1577348614.335831,
&quot;attr_flags&quot;: &quot;e&quot;,
&quot;attributes&quot;: [
&quot;extents&quot;
],
&quot;executable&quot;: true,
&quot;exists&quot;: true,
&quot;gid&quot;: 19000,
&quot;inode&quot;: 925342,
}
},
{
&quot;ansible_loop_var&quot;: &quot;item&quot;,
&quot;changed&quot;: false,
&quot;failed&quot;: false,
&quot;invocation&quot;: {
&quot;module_args&quot;: {
&quot;checksum_algorithm&quot;: &quot;sha1&quot;,
&quot;path&quot;: &quot;/home/administrator/.mozilla/firefox&quot;
}
},
&quot;item&quot;: {
&quot;name&quot;: &quot;administrator&quot;
},
&quot;stat&quot;: {
&quot;atime&quot;: 1577349447.4605036,
&quot;attr_flags&quot;: &quot;e&quot;,
&quot;attributes&quot;: [
&quot;extents&quot;
],
&quot;block_size&quot;: 4096,
&quot;blocks&quot;: 8,
&quot;charset&quot;: &quot;binary&quot;,
&quot;exists&quot;: false,
}
},
</code></pre>
<p>一開始是先注意到了為什麼裡面還有 item ?</p>
<p>再往上看，就發現多了一個 results 把原本的list 清單給包起來了</p>
<p>所以原本用 profile_exists.stat.exists 可以取得目錄是否存在(true/false)</p>
<p>但是現在因為多了一層 results ，所以變成取不到值</p>
<p>沒關係，既然知道了有多了一層 results ，那就知道要怎麼做了</p>
<h3 id="修正後續task">修正後續task</h3>
<p>後面的task 稍微改一下，在指定 with_items 的時候，直接指定 profile_exists.results</p>
<p>接下來的用法就比較簡單了，跟原本接stat 變數的語法差不多</p>
<pre><code>- name: run firefox to create default profile
become_user: &quot;{{ item.item.name }}&quot;
shell: &quot;firefox --headless &amp;&quot;
ignore_errors: True
when: item.stat.exists == false
with_items: &quot;{{ profile_exists.results }}&quot;
</code></pre>
<p>透過這次的playbook 又知道了怎麼承接 loop register 跑出來的值，又學了一課</p>
<p>本來一開始的想法是register dynamic variable name</p>
<p>像是 a_exist,b_exist,c_exist 這樣</p>
<p>不過ansible 不這樣處理，會自動的把所有結果都包在一個 results list 裡面</p>
<p>也算是還滿好用的啦</p>
</article>
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<div class="entry-tags"><p><span>Tags</span>
<a href="/tags/ansible" title="View all posts tagged ansible">ansible</a>
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Written by:<a href="https://github.com/changchichung" title="Posts by Eric Chang" rel="author">Eric Chang</a> </span>
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