On 05/28/14 16:50, Adam Morris wrote:
> For the specific example given: apache role and wsgi role there may be a
> simple, elegant, solution. Apache can include other configuration files, I
> don't know if it can include directories. If so include a directory. If not
> use the assemble module to create your included file.
>
> Then the wsgi role just needs to drop a fragment or a complete file.
>
> Template encapsulation seems like it could get complicated fast. Particularly
> if you have dependency chains... how far back should it go?
It is true that software that has support for include directories can
help, but it become less helpful as you add more levels in ther hierarchy
For example, consider a tree like this:
'apache' role
|
+-------------------------+-------------------------+
| |
|
'wsgi_app' role 'php_app' role
'passenger_app'
| |
+-----------------------+
+------------------------+
| | |
|
'django_app' role 'flask_app' role 'redmine_app'
role 'gitlab_app' role
Deploying all or a subset of the above roles on the same server could be
most easily done if my proposal for template encapsulation was available.
> So is there another use case that we can discuss.
I have a 'common' role that deploys /etc/hosts. In 'cluster node' role
luster nodes I also add lines for all nodes in the cluster. Now I am
using a really ugly loop around lineinfile for this that took me some
time before I made it place the content properly. Try to use lineinfile
with a relatively complex data structure and you will remember my words.
Instead, it would be far more easy to write an "extra_hosts" block and
do things in pure jinja.
> I'm thinking that they wish they'd called them prerequisites not dependencies
> now. :-)
>
> Adam
>
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