On 14 Nov 2016 8:39 am, "Marcin Kulisz" <debian@kulisz.net> wrote:
>
> On 2016-11-13 20:58:02, Thomas Lange wrote:
> > Hi Lars,
> >
> > I'm really wondering why you want to use YAML for this?
>
> I can talk just for my self but my pros would be: cleanliness, machine
> parcebility, human redeability, neat python integration, simple templating
> integration (jinja2) with programming languages. So I suppose Lars
> would agree with those and possibly add something else.
>
> > Your examples
> > look like things you could easily implement in shell, if you provide
> > some functions, subroutines or external programs that implement your
> > steps. Then your DSL would just be a shell script that the user has to
> > write.
> >
> >
> > create_raw_file $size $image
> > create_partition_table msdos
> > create_partition $bootsize ext2 /boot bootable
> > create_partition rest ext4 /
> > mount_all
>
> Above doesn't look so neat to me like well structured schema based yaml.
>
> > and so on.
> >
> > > The "step:" key specifies the step to execute. The other keys are
> > > parameters for the step. The {{...}} parts are where Jinja2 is used
> > > to expand variable values.
> > These things are very similar to calling commands with parameters in a
> > shell script without the need of YAML and Jinja2.
>
> Yes, but IMO yaml and jinja2 allow for creating very simple and nice
> integration and extending capabilities with minimal effort.
>
> > Much easier and more common for sysadmins IMO.
>
> I can agree that this may be the case for some people but it's hard to deny
> that there are restrictions on bash which can't be overcome due to bash nature
> and which does not exist in python as this is fully blown programming language.
>
> And yes I know Thomas your approach to object orientated programming :-)
>
> What Lars is proposing I see as a very reasonable thing to do. Providing well design
> and maintained tool with easy extensibility and a way to accommodate eventual
> future requirements.
>
> IMO what Lars is trying to achieve is much easier to do in python then in bash
> and with properly abstracted logic there should be no need to anybody using
> this tool to even know python (what for me is a bit odd for sysadmins) to create
> images with vmdb.
> Knowledge of available options and basics of yaml would suffice and I think
> this is even lower threshold for entry level then knowing bash.
These days golang is the go, excuse the pun and the fact it compiles to a single executable means the language and extra packages such as jinja2 are not required.
> --
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