How Can I render Double Curly Braces {{ and }} during Golang Template rendering?¶
Often times, content based Golang templating is used to generate template files used by other systems on the target machine (eg Jinja, Ansible, etc.). Many of these templating systems also use double curly braces to signal to the templating engine to perform expansion and advanced rendering capabilities.
In these cases, the content author must arrange the DRP Golang based
template to protect the double curly braces from being intepretted by
dr-provision at render time, so they are served as in-tact double
curly braces to the target Machine.
Note that this solution is NOT an exhaustive reference of how to do this, but does describe some possible techniques.
Solutions¶
Golang template complains if you are building a template that also uses
double curly brances (e.g. {{ jinja 2 for ansible }}) and it can be
difficult to properly escape these characters.
There are multiple solutions, please review to see which best fits your needs.
Solution 1: Escape In Place¶
You can also use a pair of single quotes (`) to escape the block in place to create an string that is not modifed by gotemplates inside a gotemplate brace pair.
Generallly, this approach is recommended because it is simple and easy to read.
Example
{{{{ services['drpcli.service'].status }}}}
Solution 2: Substitution¶
Another workaround is to define variables for the double brace and then use the variable in the template.
This approach is needed to make more template substitions inside the Ansible code block.
Example
{{ $openblock := "\x7B\x7B" }} {{ $closeblock := "\x7D\x7D" }}
- hosts: localhost vars: braceme: "{{ $openblock }}{{ .Param "variable" }}{{ $closeblock }}"
Additional Information¶
Additional resources and information related to this Knowledge Base article.
Example
See Also¶
Versions¶
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Keywords¶
double curly braces, jinja2, ansible, rendering, template