Re: machine api to supervise

From: Buck Evan <>
Date: Fri, 16 Oct 2015 14:11:42 -0700

If you'll specify how you want it to look / work I'll (possibly) attempt to
provide a patch.

`s6-svstat --json` is my initial bid.

I'll try to match the nosh output as closely as is reasonable.

On Thu, Sep 24, 2015 at 4:27 AM, Laurent Bercot <
> wrote:

> On 24/09/2015 12:56, e-mail j.deboynepollard-newsgroups wrote:
>> Unless some daemontools-family
>> developer goes and does something wrongheaded like breaking compatibility
> I did. There were good reasons for it: the way the bits are arranged in
> the legacy daemontools status format is suboptimal, and getting the useful
> information out of it requires a little extra work - and I got confused
> a few times by the meaning of the bits.
> The status file was never an "official" interface, and the tools that
> parse it are actually looking under the hood and breaking abstraction
> layers. I'm surprised that you, of all people, advocate this procedure:
> this is clearly bad programming practice.
> There is something wrong with processing the output of svstat, and you are
>> right to be leery of doing so. The daemontools manual explicitly states
>> that it
>> is human readable, rather than machine-readable. And there are variations
>> in the
>> human-readable forms, which are fine for humans but no good for programs.
> Still, svstat is the only "official" interface, so for now it's the only
> safe way to proceed. I agree that it is inconvenient, and that daemontools
> should have provided a tool to get machine-readable status information;
> but in the absence of such a tool, svstat is the entry point and should
> be used as such.
> s6 provides a C API to read status: s6_svstatus_read(). The command-line
> interface to it is s6-svstat. It's currently lacking options to output
> machine-readable data; I plan to add that functionality, but in the
> meantime, it *is* the interface.
> --
> Laurent
Received on Fri Oct 16 2015 - 21:11:42 UTC

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