Re: testing the current bootstrap context?
Re: testing the current bootstrap context?
- Subject: Re: testing the current bootstrap context?
- From: Terry Lambert <email@hidden>
- Date: Fri, 10 Apr 2009 12:17:36 -0700
On Apr 10, 2009, at 11:55 AM, Bill Janssen <email@hidden> wrote:
Terry Lambert <email@hidden> wrote:
On Apr 10, 2009, at 9:31 AM, Bill Janssen <email@hidden> wrote:
Michael Smith <email@hidden> wrote:
On Apr 9, 2009, at 9:30 AM, Bill Janssen wrote:
Michael Smith <email@hidden> wrote:
It's usually straightforward for the daemon to vend the
appropriate
self-manipulation functionality; frequently you want to gate this
with
application-specific logic anyway.
Well, the daemon does a lot of things, but what I'm concerned with
is
stop, start, and restart.
Why do you need 'stop'? Why can't you just ask the daemon to
enter a
state where it refuses requests?
Because I want to fix it with new code.
So just fix it and tell it to exit.
When a process exits and launchd restarts it, launchd doesn't know if
it's running old code or new code when it's relaunched, it just knows
its path.
Sure, but the old code does bad things on exit (like saving state in
an
invalid format). I'm pretty sure I need, in the general case, to be
able to stop it, fix things, and restart it.
Support a command to exit without saving state before your first
deployment.
Robust systems self-heal rather than requiring an external agency. Why
do you need it stopped while you fix things externally, rather than
having a check to see if things need to be fixed be the first thing
you do when you restart, and self-heal?
If nothing else, instead of installing the binary for your process,
install the binary for the fix process instead, and have the last
thing it does as it fixes things is replace its binary and exit.
We intentionally erected a protection domain barrier here, where
processes that do what your process wants to do have to ask permission
to perform privileged operations, or at least politely request those
privileged operations be performed on their behalf.
Your code needs to Roth ask politely like everyone else, or run as root.
-- Terry
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