rc.initdiskless revision 50357 
1#
2# /etc/rc.diskless - general BOOTP startup
3#
4#	BOOTP has mounted / for us.  Assume a read-only mount.  We must then
5#	- figure out where the NFS mount is coming from
6#	- figure out our IP by querying the interface
7#	- retarget /conf/ME softlink to proper configuration script directory
8#
9#	It is expected that /etc/fstab and /etc/rc.conf.local will be
10#	set by the system operator on the server to be softlinks to
11#	/conf/ME/fstab and /conf/ME/rc.conf.local.  The system operator may
12#	choose to retarget other files as well.  The server itself boots
13#	properly with its default /conf/ME softlink pointing to 
14#	/conf/server.host.name.  
15#
16#	During a diskless boot, we retarget the /conf/ME softlink to point
17#	to /conf/DISKLESS.CLIENT.IP.ADDRESS.  Thus, various system config
18#	files that are softlinks through /conf/ME also get retargeted.
19#
20# SEE SAMPLE FILES IN /usr/share/examples/diskless. 
21
22# chkerr:
23#
24# Routine to check for error
25#
26#	checks error code and drops into shell on failure.
27#	if shell exits, terminates script as well as /etc/rc.
28
29chkerr() {
30	if [ $1 != 0 ]; then
31		echo "$2 failed: dropping into /bin/sh"
32		/bin/sh
33		# RESUME
34	fi
35}
36
37# DEBUGGING
38#
39set -v
40
41#  Figure out where the root mount is coming from, synthesize a mount
42#  for /usr and mount it.
43#
44#  e.g. nfs_root might wind up as "A.B.C.D:/"
45#
46#  NOTE! the /usr mount is only temporary so we can access commands necessary
47#  to retarget /conf/ME.  The actual /usr mount should be part of the
48#  retargeted /etc/fstab.  See instructions in /usr/share/examples/diskless.
49#
50set `/bin/df /`
51nfs_root=$8
52mount_nfs -o ro ${nfs_root}/usr /usr
53
54chkerr $? "mount of /usr"
55
56#  Figure out our interface and IP.
57#
58
59bootp_ifc=`route -n get default | fgrep interface | awk '{ print $2; }'`
60bootp_ipa=`ifconfig ${bootp_ifc} | fgrep inet | head -1 | awk '{ print $2; }'`
61
62echo "Interface ${bootp_ifc} IP-Address ${bootp_ipa}"
63
64umount /usr
65
66# retarget /conf/ME
67#
68# MFS's background process takes a bit to startup.  Various config files
69# on server should be softlinks through /conf/ME.  The server's own /conf/ME
70# points to the server's version of the files.
71#
72# We retarget /conf/ME using a -o union mount.  This allows
73# us to 'mkdir' over whatever was there previously.
74#
75# WARNING! null mounts cannot handle mmap, and since many programs
76# use mmap (such as 'cp'), we have to copy.
77
78mount_mfs -s 256 -T qp120at -o union dummy /conf
79chkerr $? "MFS mount on /conf"
80
81mkdir /conf/ME
82cp -Rp /conf/$bootp_ipa/* /conf/ME
83
84# retarget the kernel
85#
86
87sysctl -w kern.bootfile=/conf/ME/kernel
88
89# Tell /etc/rc to run the specified script after
90# it does its mounts but before it does anything
91# else.
92#
93# This script is responsible for setting up the
94# diskless mount environment.  This can be 
95# overriden by /conf/ME/rc.conf.local if, for
96# example, you do not want to run the standard
97# system /etc/rc.diskless2
98
99diskless_mount="/etc/rc.diskless2"
100