Jinja2 include variable

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Jinja2 include variable

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Jinja2: Check If Variable – Empty | Exists | Defined | True

Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. As long as the templates will evaluate, they will evaluate recursively to allow variable nesting. I'm having the same problem trying to generate a YAML configuration file. Is there anything we can do until the issue is solved?

Any workaround, even an ugly one? So we will need to diff the changes between 1. So the security issue was noticed in 1. What is the actual untrusted code execution that led to this change? Never mind.

jinja2 include variable

Sorry for the spam noise. I found the code in 1. Since none of the escaping mechanisms work due to recursive rendering and the jinja2 delimiter comment trick no longer works is there any way to do this on Ansible 1. I have tried everything listed here and nothing works.

I really need to use docker inspect with a custom format. I'm not using the docker module because I'm using docker compose to manage the containers, so I don't have to duplicate the container config in ansible.

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I went other way around this issue, because I needed to do several lookups on the host I just wrote a shell script with all that logic, which printed the results into stdout. Task would then register variables line by line and proceed as normal.

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This is a way cleaner solution than writing semi-binary code in task directly. Not very pretty or robust but it worked for my small usage.

Definitely if I have to do more with docker inspect I'm going to write a docker facts module or try and use a preexisting one. I can confirm that when I tested this now with Ansible version 2. Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Sign up. New issue. Jump to bottom. Labels docs.

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Already on GitHub? Sign in to your account. I'm using Ansible 2. Here is a more "complete" run to show the failure and success in 2. I cannot reproduce this at all in Jinja2. Added this regression test in 3ec but it passes. There must be more to this story. This looks a lot like something that could be done much cleaner with the batch filter. Also, check out the various attributes exposed on the loop object. Variables cannot be set in loops and that is intentional.

It was never documented that you can override variables from higher scopes and that was considered a bug. See also Maybe it'd be worth raising an exception when trying to do this in a way that worked in 2.

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Added a test for an assumed regression refs This comment has been minimized.Released: Apr 13, View statistics for this project via Libraries. Jinja is a fast, expressive, extensible templating engine. Special placeholders in the template allow writing code similar to Python syntax.

jinja2 include variable

Then the template is passed data to render the final document. Install and update using pip :. Feb 5, Apr 13, Jan 30, Jan 27, Oct 4, Apr 6, Nov 8, Apr 3, Jan 28, Jan 10, Jan 8, Jan 7, Dec 29, Jul 26, Jun 6, Aug 7, May 20, GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

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Sign in to your account. Executing the same playbook that uses a template with a set and include results in an undefined variable error on CentOS 8, but it works on CentOS 7. It looks like that on CentOS 8 all variables in scope will be evaluated, so also the once that are not used, which is the reason for this error.

On both operating systems the latest available version standard repo is used. See for details the version section. This is the result when running on CentOS In that case change the template by removing the set and replace this with a for loop that contains only a single element:.

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If these files are incorrect, please update the component name section of the description or use the! From that commit it appears this is an expected change in behavior in Jinja2 that has been introduced in Jinja2 2. However, it appears that jinja2 change is actually causing similar behavior as described in Thanks for the analyses.

The addition from sivel is important. In both situations the context contains all variables, but on CentOS 8 with the newer Jinja2 version in this situation all variables are evaluated, even the ones that are not used at all.

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jinja2 include variable

Copy link Quote reply. There is also a workaround, see the latest section. This comment has been minimized. Sign in to view.

Fixes ansible Inconsistency in the scope of variables defined at different places in a role This commit was created on GitHub. Fixes Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment.

jinja2 include variable

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Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. I can confirm this bug with jinja 2. It doesn't matter if the variable is used or not before the include statement. Evenmore, my case is even simpler as I do not use template inheritance.

I have just a simple template with a for loop and an include statement inside the loop that includes another simple template that tries to access the variable set with each iteration in the loop.

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False alarm. I was using jinja through Ansible and it is Ansible's fault it uses jinja in a way that included templates are not passed the context.

It is fixed for the upcoming version 2. You can "fix" it using xen 's method of using the variable inside the block:. This is not reproducible in version 2.

It looks to have been solved with Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Sign up. New issue. Jump to bottom. Copy link Quote reply. This comment has been minimized.

Sign in to view. This was referenced Oct 29, Add support for preserving context when importing Oops, I guess that'll teach me to force push! Can this be closed? Sign up for free to join this conversation on GitHub.This document describes the syntax and semantics of the template engine and will be most useful as reference to those creating Jinja templates.

As the template engine is very flexible, the configuration from the application can be slightly different from the code presented here in terms of delimiters and behavior of undefined values.

A Jinja template is simply a text file. The template syntax is heavily inspired by Django and Python. Below is a minimal template that illustrates a few basics using the default Jinja configuration. We will cover the details later in this document:.

The following example shows the default configuration settings. As stated above, any file can be loaded as a template, regardless of file extension. Adding a. Another good heuristic for identifying templates is that they are in a templates folder, regardless of extension.

This is a common layout for projects. You can mess around with the variables in templates provided they are passed in by the application. Variables may have attributes or elements on them you can access too. What attributes a variable has depends heavily on the application providing that variable. You can use a dot. If a variable or attribute does not exist, you will get back an undefined value. What you can do with that kind of value depends on the application configuration: the default behavior is to evaluate to an empty string if printed or iterated over, and to fail for every other operation.

For the sake of convenience, foo. This is important if an object has an item and attribute with the same name. Additionally, the attr filter only looks up attributes. Variables can be modified by filters. Filters are separated from the variable by a pipe symbol and may have optional arguments in parentheses. Multiple filters can be chained. The output of one filter is applied to the next.

Filters that accept arguments have parentheses around the arguments, just like a function call. The List of Builtin Filters below describes all the builtin filters. Tests can be used to test a variable against a common expression.While automation exists to make it easier to make things repeatable, all systems are not exactly alike; some may require configuration that is slightly different from others.

In some instances, the observed behavior or state of one system might influence how you configure other systems. For example, you might need to find out the IP address of a system and use it as a configuration value on another system. The ansible-examples github repository contains many examples of how variables are used in Ansible. Variable names should be letters, numbers, and underscores.

Variables should always start with a letter. You can then reference a specific field in the dictionary using either bracket notation or dot notation:. However, if you choose to use dot notation be aware that some keys can cause problems because they collide with attributes and methods of python dictionaries.

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You should use bracket notation instead of dot notation if you use keys which start and end with two underscores Those are reserved for special meanings in python or are any of the known public attributes:. The How to build your inventory page has details on setting Assigning a variable to one machine: host variables and Assigning a variable to many machines: group variables in inventory.

As described in Rolesvariables can also be included in the playbook via include files, which may or may not be part of an Ansible Role. Usage of roles is preferred as it provides a nice organizational system.

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Inside a template you automatically have access to all variables that are in scope for a host. Ansible playbooks are pure machine-parseable YAML.

This is a rather important feature as it means it is possible to code-generate pieces of files, or to have other ecosystem tools read Ansible files. Not everyone will need this but it can unlock possibilities. Jinja2 filters let you transform the value of a variable within a template expression. Jinja2 includes many built-in filters and Ansible supplies many more filters. There are other places where variables can come from, but these are a type of variable that are discovered, not set by the user.

Facts are information derived from speaking with your remote systems. Facts are frequently used in conditionals see Conditionals and also in templates.

This has advantages in scaling Ansible in push mode with very large numbers of systems, mainly, or if you are using Ansible on experimental platforms.

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In any play, just do this:. As discussed in the playbooks chapter, Ansible facts are a way of getting data about remote systems for use in playbook variables. Usually these are discovered automatically by the setup module in Ansible.

Users can also write custom facts modules, as described in the API guide. However, what if you want to have a simple way to provide system or user provided data for use in Ansible variables, without writing a fact module?


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