[systemd-devel] machinectl status vs show

[Johannes Ernst]

In which case:

1. The man pages, to me, imply that I should be able to get everything that ‘status' shows using ‘show' because it says:

"This function is intended to generate human-readable output. If you are looking for computer-parsable output, use show instead.” (and vice versa)

This sentence may need a revision.

2. So how do I get at the IP address of the container in a way that is easily parseable?

Cheers,


Johannes.


> On Jun 17, 2015, at 1:42, Lennart Poettering <lennart at poettering.net> wrote:
> 
> On Wed, 17.06.15 10:13, David Herrmann (dh.herrmann at gmail.com <mailto:dh.herrmann at gmail.com>) wrote:
> 
>> Hi
>> 
>> On Wed, Jun 17, 2015 at 5:53 AM, Johannes Ernst
>> <johannes.ernst at gmail.com> wrote:
>>> Are those supposed to produce the same information, just formatted differently (man vs machine per man page)?
>>> 
>>> I’m failing to convince ‘show’ to give me the container’s IP address, while ‘status’ has all of them.
>> 
>> As with almost all *ctl tools in systemd, 'show' is used to print DBus
>> properties of the object in question. 'status' on the other hand
>> prints a human-readable, pre-selected set of attributes of an object.
>> 
>> With machinectl, the 'show' command must be used with a parameter. So
>> `machinectl --all show $machine` should contain the same information
>> as `machinectl status $machine`, and even more. If that's not the
>> case, please post an example.
> 
> Well, "machinectl status" also shows the cgroup tree, which
> "machinectl show" currently does not.
> 
> The IP addresses are not exposed as property, they are exposed
> as method, since acquiring them is relatively complex due to
> transitioning into the containers... That means they show up in
> "machinectl status", because that code explicitly calls that method,
> but not in "machinectl show" which shows the plain props, and nothing
> else.
> 
> Note that "systemctl show" and "systemctl status" have a similar
> relationship as "machinectl show" and "machinectl status".
> 
> Lennart
> 
> -- 
> Lennart Poettering, Red Hat

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