Working with with_items and some filter

[Bastian Bringenberg]

Hey ho,

I would like to deploy an application to several vhosts is item.useApplication exists. I am possible to do that, download files and so on and so on. But I get a problem as soon as I want to do an action if the application is never installed.

Normally:

- stat: path=/etc/.git

  register: exists_git

  ignore_errors: yes

- lineinfile: dest=/etc/rkhunter.conf line='ALLOWHIDDENDIR="/etc/.git"' owner=root group=root mode=0644

  when: exists_git.stat.exists

But how is it possible for me to do this combined with "with_items"? One approach, that (untested) will not work in my opinion:

 - stat: path=/etc/.git

  register: exists_git_{{ item.name }}

  with_items: hosts

  when: item.useApplication

  ignore_errors: yes

- lineinfile: dest=/etc/rkhunter.conf line='ALLOWHIDDENDIR="/etc/.git"' owner=root group=root mode=0644

  with_items: hosts

  when: item.useApplication

  when: exists_git_{{ item.name }}.stat.exists

Is someone able to help me here?

Have a nice week,

Greetings from Bochum, RuhrArea, Germany,

Bastian

PS: rkhunter is just a demonstration how I do this normally^^.

[Michael DeHaan]

You can't say "when:" twice, but you can feed it a list.

when:

   - item.useApplication

   - other_conditional

What you are doing with building a variable name in a conditional is a little weird, and this doesn't work.

Rather, register when used with "with_items" will return an array, which you can easily debug:

 - stat: path=/etc/.git

   register: stats 

   with_items: hosts

   when: item.useApplication

- debug: var=stats

Though ultimately, it looks like you should drop the lineinfile and just include your logic in a template, and it will be much cleaner and easier.

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[Bastian Bringenberg]

Hey ho,

You can't say "when:" twice, but you can feed it a list.

when:

   - item.useApplication

   - other_conditional

perfect!

What you are doing with building a variable name in a conditional is a little weird, and this doesn't work.

Rather, register when used with "with_items" will return an array, which you can easily debug:

 - stat: path=/etc/.git

   register: stats 

   with_items: hosts

   when: item.useApplication

- debug: var=stats

Though ultimately, it looks like you should drop the lineinfile and just include your logic in a template, and it will be much cleaner and easier.

I do that with templates but I want to unzip, move and copy some files to create a perfect application environment. Perhaps your return of an array will solve my problem^^.

As soon as I tried this solution I will give you an answer! Thanks for the moment!

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[Bastian Bringenberg]

I am not able to figure out which array position is important for the current item as:

hosts:

* 1 - noApplication ( ID = 3 )
* 2 - Application ( ID = 2 )
* 3 - Application ( ID = 42 )

would be 

* 1 ( ID = 2 )
* 2 ( ID = 42 )

And I see no way to match those... Any Idea? Or is it possible without a lot of problems to create a plugin in ansible to solve this problem?

[Michael DeHaan]

Sorry, I'm no following the above.

Can we step back a moment?   

This appears to be a playbook that fixes various things in particular git directories, if found, for a very large number of git directories?

Knowing what you are trying to do might help suggest a more idiomatic solution.

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[Bastian Bringenberg]

Okay =).

I could write it down in some kind of PHP so you get my point.

I have got:

hosts:

  - name: "domain.tld"

    database:

      name: test

      user: test

      pw: test

    systemUser: domain

    useApplication: true

This will create me /var/www/domain.tld with everything I normally need. No I add "useApplication" for example ownCloud.

The steps I need to do are:

* Download Zip File

* Extract Zip File

* Move Content of ZipFile Around ( important as owncloud.zip contains a folder named owncloud/ )

* Install a Template for the Settings

* Run a Database Dummy

* Remove WebDav

* Restart Apache

But only do that if there is no locking file. I do not want to have all of this done on each run and need some kind of if( ! file_exists(lockfile) ) doEverything();

And all of this should of course only happen if useApplication is set to true^^.

foreach($hosts as $item) {

if( $item->useApplication ) {

if( ! file_exsists( $item->getLockfile() ) ) {

doAllAbove();

}

}

}

Is this more clear?

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[Michael DeHaan]

Not really.

Is the issue you have a delegated host action that you only want to run once?

If so you could factor this out to an action that happens last in the playbook.

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[Bastian Bringenberg]

Not only once a run, I want to have it run only to install it^^.

So if the vhost Application is already installed I don't want to have the package to unzip anymore, move files around or run the database dummy. I am able to control this behavior without "with_items" but as soon as I a have an array of informations to be checked for each I am not able to 

 - name: "domain.tld"

    database:

      name: test

      user: test

      pw: test

    systemUser: domain

    useApplication: true

Another option would be to register the stats informations into my "item" from the config array so I am able to say:

 - name: whatever

   whatever command

   with_items: hosts

   when: item.myFile.stats.exists

Easy what I need to do:

foreach ( hosts as item){

if( item.hasApplication ) {

temp = stat( item.filedir + 'myLockFile' )

if( ! temp.exists) {

/**

 * Download a Script

 * unzip it

 * move files around

 * Create templates ( config files ) with informations from single host

 * Change Owner of certain files

 * Create myLockFile

 */

}

} 

}

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