RE: pipes, scripts, and launchd
RE: pipes, scripts, and launchd
- Subject: RE: pipes, scripts, and launchd
- From: "Benjamin Huntsman" <email@hidden>
- Date: Fri, 28 Dec 2007 15:41:01 -0800
- Thread-topic: pipes, scripts, and launchd
I had a similar situation where we had to create a symbolic link at startup, in Leopard, where there's only launchd. Here's my plist:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd";>
<plist version="1.0">
<dict>
<key>Debug</key>
<false/>
<key>Label</key>
<string>com.mycompany.f5-prep</string>
<key>OnDemand</key>
<false/>
<key>ProgramArguments</key>
<array>
<string>/bin/ln</string>
<string>-s</string>
<string>/var/run/DirectoryService.pid</string>
<string>/var/run/lookupd.pid</string>
</array>
<key>RunAtLoad</key>
<true/>
</dict>
</plist>
just keep each flag to postgres on a seperate <string></string> line. Something like:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd";>
<plist version="1.0">
<dict>
<key>Debug</key>
<false/>
<key>Label</key>
<string>com.yourcompany.rotatelogs</string>
<key>OnDemand</key>
<false/>
<key>ProgramArguments</key>
<array>
<string>postgres</string>
<string>args</string>
<string>|</string>
<string>rotatelogs</string>
<string>args</string>
</array>
<key>RunAtLoad</key>
<true/>
</dict>
</plist>
ought to work. I believe it just launchd will pass the <strings> verbatim, so launchd would end up generating the same command you typed below.
worth a try, at least...
-----Original Message-----
From: darwin-dev-bounces+bhuntsman=email@hidden on behalf of Dave Zarzycki
Sent: Fri 12/28/2007 3:25 PM
To: Perry Smith
Cc: email@hidden
Subject: Re: pipes, scripts, and launchd
I haven't tested this, but I suspect it should work...
Setup:
mkfifo /var/postgres_pipe
Job 1:
Have postgres write to /var/postgres_pipe via the launchd plist
StandardOutPath and StandardErrorPath keys.
Job 2:
#!/bin/sh
exec rotatelogs < /var/postgres_pipe
# Note to self: It would have been nice if launchd supported a
StandardInputPath configuration option
davez
On Dec 28, 2007, at 8:44 AM, Perry Smith wrote:
> I may be making too big a deal of all this but I can't figure out
> how to do something like:
>
> postgres <args> | rotatelogs <args>
>
> from launchd. If I put that command in a simple bash shell script,
> I *believe* it will not work. The signal will go to bash and bash
> will not pass it along to the children.
>
> I could trap the signal and pass it along myself... but, $! gives
> the pid for the last process in the pipe (rotatelogs). That is not
> what I need to signal. I need the signal passed to postgres. And,
> in fact, it would be nice if the signal did NOT pass to rotatelogs.
> I'd like for it to stop when its input closes and not before then.
>
> I'm going to look in to using ksh and maybe using co-processes with
> ksh. bash does not seem to have that concept. But, it just seems
> like it should not be this hard to do.
>
> Anyone have any suggestions of how to do this?
>
> Thank you,
> pedz
>
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