Overhaul dhcpcd for chrome os use

dhcpcd-run-hooks.8.in

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-.\" Copyright (c) 2006-2009 Roy Marples
-.\" All rights reserved
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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-.\"
-.Dd March 23, 2009
-.Dt DHCPCD-RUN-HOOKS 8 SMM
-.Os
-.Sh NAME
-.Nm dhcpcd-run-hooks
-.Nd DHCP client configuration script 
-.Sh DESCRIPTION
-.Nm
-is used by
-.Xr dhcpcd 8
-to run any system and user defined hook scripts.
-System hook scripts are found in
-.Pa @HOOKDIR@
-and the user defined hooks are 
-.Pa @SYSCONFDIR@/dhcpcd.enter-hook .
-and
-.Pa @SYSCONFDIR@/dhcpcd.exit-hook .
-The default install supplies hook scripts for configuring
-.Pa /etc/resolv.conf
-and the hostname.
-Your distribution may have included other hook scripts to say configure
-ntp or ypbind.
-A test hook is also supplied that simply echos the dhcp variables to the
-console from DISCOVER message.
-.Pp
-Each time
-.Nm
-is invoked,
-.Ev $interface
-is set to the interface that
-.Nm dhcpcd
-is run on and
-.Ev $reason
-is to the reason why
-.Nm
-was invoked.
-DHCP information to be configured is held in variables starting with the word
-new_ and old DHCP information to be removed is held in variables starting with
-the word old_.
-.Nm dhcpcd
-can display the full list of variables it knows how about by using the
-.Fl V , -variables
-argument.
-.Pp
-Here's a list of reasons why
-.Nm
-could be invoked:
-.Bl -tag -width PREINIT
-.It Dv PREINIT
-dhcpcd is starting up and any pre-initialisation should be done.
-.It Dv CARRIER
-dhcpcd has detected the carrier is up.
-This is generally just a notification and no action need be taken.
-.It Dv INFORM
-dhcpcd informed a DHCP server about it's address and obtained other
-configuration details.
-.It Dv BOUND
-dhcpcd obtained a new lease from a DHCP server.
-.It Dv RENEW
-dhcpcd renewed it's lease.
-.It Dv REBIND
-dhcpcd has rebound to a new DHCP server.
-.It Dv REBOOT
-dhcpcd successfully requested a lease from a DHCP server.
-.It Dv IPV4LL
-dhcpcd failed to contact any DHCP servers but did obtain an IPV4LL address.
-.It Dv STATIC
-dhcpcd has been configured with a static configuration which has not been
-obtained from a DHCP server.
-.It Dv 3RDPARTY
-dhcpcd is monitoring the interface for a 3rd party to give it an IP address.
-.It Dv TIMEOUT
-dhcpcd failed to contact any DHCP servers but was able to use an old lease.
-.It Dv EXPIRE
-dhcpcd's lease or state expired and it failed to obtain a new one.
-.It Dv NAK
-dhcpcd received a NAK from the DHCP server.
-This should be treated as EXPIRE.
-.It Dv NOCARRIER
-dhcpcd lost the carrier.
-The cable may have been unplugged or association to the wireless point lost.
-.It Dv FAIL
-dhcpcd failed to operate on the interface.
-This normally happens when dhcpcd does not support the raw interface, which
-means it cannot work as a DHCP or ZeroConf client.
-Static configuration and DHCP INFORM is still allowed.
-.It Dv STOP
-dhcpcd stopped running on the interface.
-.It Dv TEST
-dhcpcd received an OFFER from a DHCP server but will not configure the
-interface.
-This is primarily used to test the variables are filled correctly for the
-script to process them.
-.El
-.Sh FILES 
-When
-.Nm
-runs, it loads
-.Pa @SYSCONFDIR@/dhcpcd.enter-hook
-and any scripts found in
-.Pa @HOOKDIR@
-in a lexical order and then finally
-.Pa @SYSCONFDIR@/dhcpcd.exit-hook
-.Sh SEE ALSO
-.Xr dhcpcd 8
-.Sh AUTHORS
-.An Roy Marples Aq roy@marples.name
-.Sh BUGS
-Please report them to http://roy.marples.name/projects/dhcpcd