startupitems arcanery

[Eric Cronin]

They are shell commands, executed by /bin/[ (see man test).  First  
one checks that ${prefix}/sbin/dhcpd exists and is +x, the second  
that the PID file exists and is readable...  The escapes are needed  
to protect [ and $ from tcl (${prefix} is a tcl variable evaluated  
when the Portfile runs, ${PID} is a sh variable evaluated each time  
the startupitem runs.

Thanks,
Eric

On Mar 29, 2007, at 12:04 PM, markd at macports.org wrote:

> I am trying to understand the startupitems in the dhcp port because  
> I want
> to do somewthing similar in another port.  Can someone explain what  
> the
> escapes, brackets, "-x", and "-r" do?  And what interprets the "-x"  
> and
> "-r"?  The shell?
>
> startupitem.create      yes
> startupitem.name        dhcpd
> startupitem.init        "PID=/var/run/dhcpd.pid"
> startupitem.start       "\[ -x ${prefix}/sbin/dhcpd \] &&
> ${prefix}/sbin/dhcpd -cf ${prefix}/etc/dhcp/dhcpd.conf -lf
> ${prefix}/var/db/dhcpd/dhcpd.leases"
> startupitem.stop        "\[ -r \${PID} \] && kill \$(cat \${PID})"
>
> Mark
>
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>

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