sysvinit wrappers

sysvinit wrappers

[Alejandro Mery]

hi,
i'm coding the 'rest of sysvinit' in bash :p and i have three questions
to runit community/boss.

1. to add halt and reboot lines to wtmp, can [-h|-r] added to utmpset?
any better way?
2. how can i know if i'm on runlevel 1, 2 or 3?
3. which would be the right filenames for forced halt/reboot?

Thanks in advance,
Alejandro Mery

Re: sysvinit wrappers

[Gerrit Pape]

On Tue, May 18, 2004 at 10:09:43PM -0400, Alejandro Mery wrote:
> i'm coding the 'rest of sysvinit' in bash :p and i have three questions

I would be interested in how you use it, and how you integrate it with
runit, although I'm not completely sure about what the 'rest of
sysvinit' is.

> 1. to add halt and reboot lines to wtmp, can [-h|-r] added to utmpset?
> any better way?

Or maybe a -n <name> option to specify the utmp_name.  If you extend
utmpset, please keep cross-platform compatibility in mind.   

> 2. how can i know if i'm on runlevel 1, 2 or 3?

If I understand you correctly you mean stages, not runlevels.  You're
either started from /etc/runit/1, 2, or 3; if it needs to be
distinguishable, you could use command line options.  What do you need
this for?

> 3. which would be the right filenames for forced halt/reboot?

Hmm, don't know.

Regards, Gerrit.

Re: sysvinit wrappers

[Alejandro Mery]

Gerrit Pape wrote:

>On Tue, May 18, 2004 at 10:09:43PM -0400, Alejandro Mery wrote:
>  
>
>>i'm coding the 'rest of sysvinit' in bash :p and i have three questions
>>    
>>
>
>I would be interested in how you use it, and how you integrate it with
>runit, although I'm not completely sure about what the 'rest of
>sysvinit' is.
>  
>
the binaries included in sysvinit in addition to init itself. i want to
provide the 'standard' tools without having both (sysvinit and runit,
net-tools and iproute2, etc...)

>>1. to add halt and reboot lines to wtmp, can [-h|-r] added to utmpset?
>>any better way?
>>    
>>
>
>Or maybe a -n <name> option to specify the utmp_name.  If you extend
>utmpset, please keep cross-platform compatibility in mind.
>  
>
i didn't wanted to code in c, i wanted just a couple of wrappers to
'emulate' clasic behavior and call real tools to do the real jobs.
but if that's the only choice...

>>2. how can i know if i'm on runlevel 1, 2 or 3?
>>    
>>
>
>If I understand you correctly you mean stages, not runlevels.  You're
>either started from /etc/runit/1, 2, or 3; if it needs to be
>distinguishable, you could use command line options.  What do you need
>this for?
>
the halt/reboot wrapper need to know if it's on stage 1 or 2 to see if
init really halts or reboots or it calls init [0|6].

Alejandro

Re: sysvinit wrappers

[Gerrit Pape]

On Thu, May 20, 2004 at 12:00:07AM -0400, Alejandro Mery wrote:
> Gerrit Pape wrote:
> >On Tue, May 18, 2004 at 10:09:43PM -0400, Alejandro Mery wrote:
> >>i'm coding the 'rest of sysvinit' in bash :p and i have three questions
> >I would be interested in how you use it, and how you integrate it with
> >runit, although I'm not completely sure about what the 'rest of
> >sysvinit' is.
> >
> the binaries included in sysvinit in addition to init itself. i want to
> provide the 'standard' tools without having both (sysvinit and runit,
> net-tools and iproute2, etc...)

Hmm, I wouldn't bother to simply implement the same tools that already
exist, unless there's very good reason to do so.  If there isn't, why
not simply use the existing tools?  Instead I would focus on the actual
functionality you want to have, and try to support this in a convenient
way; we already know that the utmp concept for example has its problems.

> >>1. to add halt and reboot lines to wtmp, can [-h|-r] added to utmpset?
> >>any better way?
> >Or maybe a -n <name> option to specify the utmp_name.  If you extend
> >utmpset, please keep cross-platform compatibility in mind.
> >
> i didn't wanted to code in c, i wanted just a couple of wrappers to
> 'emulate' clasic behavior and call real tools to do the real jobs.
> but if that's the only choice...

As far as I know there only is a C interface to the utmp/wtmp database,
at least a portable one.

> >>2. how can i know if i'm on runlevel 1, 2 or 3?
> >If I understand you correctly you mean stages, not runlevels.  You're
> >either started from /etc/runit/1, 2, or 3; if it needs to be
> >distinguishable, you could use command line options.  What do you need
> >this for?
> >
> the halt/reboot wrapper need to know if it's on stage 1 or 2 to see if
> init really halts or reboots or it calls init [0|6].

If they do completely different things (hard reboot vs running `init 6`),
I would give them different names.

Regards, Gerrit.