[ansible-project] How to convert a dict into key-val args to be passed to a module

[Vineet Naik]

Hi,

I am using the pip module to install python dependencies. What I am trying
to achieve is -

To be able to define the dependencies in one of the vars_files as follows

```
pydeps:
- name: requests
virtualenv: /tmp/testvenv
- name: boto
editable: yes
- requirements: /tmp/requirements.txt
virtualenv: /tmp/anothertestenv
```

Basically, the fields in the above list of dicts can be any valid options
accepted by the pip module - http://docs.ansible.com/pip_module.html.
Those options that are not required can be omitted just like they can be
omitted when specifying the args to the module.

And then in tasks,

```
- name: Install using pip
pip: "{% for k, v in item.items() %}{{ k }}={{ v }} {% endfor %}"
with_items: pydeps
```

However, this fails with the following error:

```
TASK: [Install using pip]
*****************************************************
fatal: [localhost] => A variable inserted a new parameter into the module
args. Be sure to quote variables if they contain equal signs (for example:
"{{var}}").

FATAL: all hosts have already failed -- aborting
```

None of the fields contain an equal sign.

I have also tried the following:

```
- name: Install using pip
pip: >
name={{ item.name }}
{{ 'chdir='~item.chdir if item.get('chdir') else '' }}
{{ 'virtualenv='~item.virtualenv if item.get('virtualenv') else ''
}}
# ... and so on
with_items: pydeps
```

But it also fails with the same error if any of the key is missing for an
item.

What's the correct way to do this?

Thanks

[Mehul Ved]

You seem to be running into this issue
https://github.com/ansible/ansible/issues/8233

Post by Vineet Naik
Hi,
I am using the pip module to install python dependencies. What I am trying
to achieve is -
To be able to define the dependencies in one of the vars_files as follows
```
- name: requests
virtualenv: /tmp/testvenv
- name: boto
editable: yes
- requirements: /tmp/requirements.txt
virtualenv: /tmp/anothertestenv
```
Basically, the fields in the above list of dicts can be any valid options
accepted by the pip module - http://docs.ansible.com/pip_module.html.
Those options that are not required can be omitted just like they can be
omitted when specifying the args to the module.
And then in tasks,
```
- name: Install using pip
pip: "{% for k, v in item.items() %}{{ k }}={{ v }} {% endfor %}"
with_items: pydeps
```
```
TASK: [Install using pip]
*****************************************************
fatal: [localhost] => A variable inserted a new parameter into the module
"{{var}}").
FATAL: all hosts have already failed -- aborting
```
None of the fields contain an equal sign.
```
- name: Install using pip
pip: >
name={{ item.name }}
{{ 'chdir='~item.chdir if item.get('chdir') else '' }}
{{ 'virtualenv='~item.virtualenv if item.get('virtualenv') else ''
}}
# ... and so on
with_items: pydeps
```
But it also fails with the same error if any of the key is missing for an
item.
What's the correct way to do this?
Thanks
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--
With Regards,
Mehul Ved

[Brian Coca]

what you want is:

- name: Install using pip
pip: name="{{ item.name}}" chdir="{{item.chdir|default(omit)}}"
virtualenv="{{item.virtualenv|default(omit)}}"
with_items: pydeps

[Vineet Naik]

Thanks Brian, default(omit) works for me.

Post by Vineet Naik
- name: Install using pip
pip: name="{{ item.name}}" chdir="{{item.chdir|default(omit)}}"
virtualenv="{{item.virtualenv|default(omit)}}"
with_items: pydeps
--
Brian Coca