dae3a64fb9
- duplicate words - typos - references to old versions of FreeBSD Reviewed by: imp, benno
383 lines
13 KiB
Bash
383 lines
13 KiB
Bash
#!/bin/sh
|
|
#
|
|
# Copyright (c) 1999 Matt Dillon
|
|
# 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
|
|
# SUCH DAMAGE.
|
|
#
|
|
# $FreeBSD$
|
|
|
|
# On entry to this script the entire system consists of a read-only root
|
|
# mounted via NFS. The kernel has run BOOTP and configured an interface
|
|
# (otherwise it would not have been able to mount the NFS root!)
|
|
#
|
|
# We use the contents of /conf to create and populate memory filesystems
|
|
# that are mounted on top of this root to implement the writable
|
|
# (and host-specific) parts of the root filesystem, and other volatile
|
|
# filesystems.
|
|
#
|
|
# The hierarchy in /conf has the form /conf/T/M/ where M are directories
|
|
# for which memory filesystems will be created and filled,
|
|
# and T is one of the "template" directories below:
|
|
#
|
|
# base universal base, typically a replica of the original root;
|
|
# default secondary universal base, typically overriding some
|
|
# of the files in the original root;
|
|
# ${ipba} where ${ipba} is the assigned broadcast IP address
|
|
# bcast/${ipba} same as above
|
|
# ${class} where ${class} is a list of directories supplied by
|
|
# bootp/dhcp through the T134 option.
|
|
# ${ipba} and ${class} are typically used to configure features
|
|
# for group of diskless clients, or even individual features;
|
|
# ${ip} where ${ip} is the machine's assigned IP address, typically
|
|
# used to set host-specific features;
|
|
# ip/${ip} same as above
|
|
#
|
|
# Template directories are scanned in the order they are listed above,
|
|
# with each successive directory overriding (merged into) the previous one;
|
|
# non-existing directories are ignored. The subdirectory forms exist to
|
|
# help keep the top level /conf manageable in large installations.
|
|
#
|
|
# The existence of a directory /conf/T/M causes this script to create a
|
|
# memory filesystem mounted as /M on the client.
|
|
#
|
|
# Some files in /conf have special meaning, namely:
|
|
#
|
|
# Filename Action
|
|
# ----------------------------------------------------------------
|
|
# /conf/T/M/remount
|
|
# The contents of the file is a mount command. E.g. if
|
|
# /conf/1.2.3.4/foo/remount contains "mount -o ro /dev/ad0s3",
|
|
# then /dev/ad0s3 will be mounted on /conf/1.2.3.4/foo/
|
|
#
|
|
# /conf/T/M/remount_optional
|
|
# If this file exists, then failure to execute the mount
|
|
# command contained in /conf/T/M/remount is non-fatal.
|
|
#
|
|
# /conf/T/M/remount_subdir
|
|
# If this file exists, then the behaviour of /conf/T/M/remount
|
|
# changes as follows:
|
|
# 1. /conf/T/M/remount is invoked to mount the root of the
|
|
# filesystem where the configuration data exists on a
|
|
# temporary mountpoint.
|
|
# 2. /conf/T/M/remount_subdir is then invoked to mount a
|
|
# *subdirectory* of the filesystem mounted by
|
|
# /conf/T/M/remount on /conf/T/M/.
|
|
#
|
|
# /conf/T/M/diskless_remount
|
|
# The contents of the file points to an NFS filesystem,
|
|
# possibly followed by mount_nfs options. If the server name
|
|
# is omitted, the script will prepend the root path used when
|
|
# booting. E.g. if you booted from foo.com:/path/to/root,
|
|
# an entry for /conf/base/etc/diskless_remount could be any of
|
|
# foo.com:/path/to/root/etc
|
|
# /etc -o ro
|
|
# Because mount_nfs understands ".." in paths, it is
|
|
# possible to mount from locations above the NFS root with
|
|
# paths such as "/../../etc".
|
|
#
|
|
# /conf/T/M/md_size
|
|
# The contents of the file specifies the size of the memory
|
|
# filesystem to be created, in 512 byte blocks.
|
|
# The default size is 10240 blocks (5MB). E.g. if
|
|
# /conf/base/etc/md_size contains "30000" then a 15MB MFS
|
|
# will be created. In case of multiple entries for the same
|
|
# directory M, the last one in the scanning order is used.
|
|
# NOTE: If you only need to create a memory filesystem but not
|
|
# initialize it from a template, it is preferable to specify
|
|
# it in fstab e.g. as "md /tmp mfs -s=30m,rw 0 0"
|
|
#
|
|
# /conf/T/SUBDIR.cpio.gz
|
|
# The file is cpio'd into /SUBDIR (and a memory filesystem is
|
|
# created for /SUBDIR if necessary). The presence of this file
|
|
# prevents the copy from /conf/T/SUBDIR/
|
|
#
|
|
# /conf/T/SUBDIR.remove
|
|
# The list of paths contained in the file are rm -rf'd
|
|
# relative to /SUBDIR.
|
|
#
|
|
# /conf/diskless_remount
|
|
# Similar to /conf/T/M/diskless_remount above, but allows
|
|
# all of /conf to be remounted. This can be used to allow
|
|
# multiple roots to share the same /conf.
|
|
#
|
|
#
|
|
# You will almost universally want to create the following files under /conf
|
|
#
|
|
# File Content
|
|
# ---------------------------- ----------------------------------
|
|
# /conf/base/etc/md_size size of /etc filesystem
|
|
# /conf/base/etc/diskless_remount "/etc"
|
|
# /conf/default/etc/rc.conf generic diskless config parameters
|
|
# /conf/default/etc/fstab generic diskless fstab e.g. like this
|
|
#
|
|
# foo:/root_part / nfs ro 0 0
|
|
# foo:/usr_part /usr nfs ro 0 0
|
|
# foo:/home_part /home nfs rw 0 0
|
|
# md /tmp mfs -s=30m,rw 0 0
|
|
# md /var mfs -s=30m,rw 0 0
|
|
# proc /proc procfs rw 0 0
|
|
#
|
|
# plus, possibly, overrides for password files etc.
|
|
#
|
|
# NOTE! /var, /tmp, and /dev will be typically created elsewhere, e.g.
|
|
# as entries in the fstab as above.
|
|
# Those filesystems should not be specified in /conf.
|
|
#
|
|
# (end of documentation, now get to the real code)
|
|
|
|
dlv=`/sbin/sysctl -n vfs.nfs.diskless_valid 2> /dev/null`
|
|
|
|
# DEBUGGING
|
|
# log something on stdout if verbose.
|
|
o_verbose=0 # set to 1 or 2 if you want more debugging
|
|
log() {
|
|
[ ${o_verbose} -gt 0 ] && echo "*** $* ***"
|
|
[ ${o_verbose} -gt 1 ] && read -p "=== Press enter to continue" foo
|
|
}
|
|
|
|
# chkerr:
|
|
#
|
|
# Routine to check for error
|
|
#
|
|
# checks error code and drops into shell on failure.
|
|
# if shell exits, terminates script as well as /etc/rc.
|
|
# if remount_optional exists under the mountpoint, skip this check.
|
|
#
|
|
chkerr() {
|
|
lastitem () ( n=$(($# - 1)) ; shift $n ; echo $1 )
|
|
mountpoint="$(lastitem $2)"
|
|
[ -r $mountpoint/remount_optional ] && ( echo "$2 failed: ignoring due to remount_optional" ; return )
|
|
case $1 in
|
|
0)
|
|
;;
|
|
*)
|
|
echo "$2 failed: dropping into /bin/sh"
|
|
/bin/sh
|
|
# RESUME
|
|
;;
|
|
esac
|
|
}
|
|
|
|
# The list of filesystems to umount after the copy
|
|
to_umount=""
|
|
|
|
handle_remount() { # $1 = mount point
|
|
local nfspt mountopts b
|
|
b=$1
|
|
log handle_remount $1
|
|
[ -d $b -a -f $b/diskless_remount ] || return
|
|
read nfspt mountopts < $b/diskless_remount
|
|
log "nfspt ${nfspt} mountopts ${mountopts}"
|
|
# prepend the nfs root if not present
|
|
[ `expr "$nfspt" : '\(.\)'` = "/" ] && nfspt="${nfsroot}${nfspt}"
|
|
mount_nfs $mountopts $nfspt $b
|
|
chkerr $? "mount_nfs $nfspt $b"
|
|
to_umount="$b ${to_umount}"
|
|
}
|
|
|
|
# Create a generic memory disk.
|
|
# The 'auto' parameter will attempt to use tmpfs(5), falls back to md(4).
|
|
# $1 is size in 512-byte sectors, $2 is the mount point.
|
|
mount_md() {
|
|
/sbin/mdmfs -s $1 auto $2
|
|
}
|
|
|
|
# Create the memory filesystem if it has not already been created
|
|
#
|
|
create_md() {
|
|
[ "x`eval echo \\$md_created_$1`" = "x" ] || return # only once
|
|
if [ "x`eval echo \\$md_size_$1`" = "x" ]; then
|
|
md_size=10240
|
|
else
|
|
md_size=`eval echo \\$md_size_$1`
|
|
fi
|
|
log create_md $1 with size $md_size
|
|
mount_md $md_size /$1
|
|
/bin/chmod 755 /$1
|
|
eval md_created_$1=created
|
|
}
|
|
|
|
# DEBUGGING
|
|
#
|
|
# set -v
|
|
|
|
# Figure out our interface and IP.
|
|
#
|
|
bootp_ifc=""
|
|
bootp_ipa=""
|
|
bootp_ipbca=""
|
|
class=""
|
|
if [ ${dlv:=0} -ne 0 ] ; then
|
|
iflist=`ifconfig -l`
|
|
for i in ${iflist} ; do
|
|
set -- `ifconfig ${i}`
|
|
while [ $# -ge 1 ] ; do
|
|
if [ "${bootp_ifc}" = "" -a "$1" = "inet" ] ; then
|
|
bootp_ifc=${i} ; bootp_ipa=${2} ; shift
|
|
fi
|
|
if [ "${bootp_ipbca}" = "" -a "$1" = "broadcast" ] ; then
|
|
bootp_ipbca=$2; shift
|
|
fi
|
|
shift
|
|
done
|
|
if [ "${bootp_ifc}" != "" ] ; then
|
|
break
|
|
fi
|
|
done
|
|
# Get the values passed with the T134 bootp cookie.
|
|
class="`/sbin/sysctl -qn kern.bootp_cookie`"
|
|
|
|
echo "Interface ${bootp_ifc} IP-Address ${bootp_ipa} Broadcast ${bootp_ipbca} ${class}"
|
|
fi
|
|
|
|
log Figure out our NFS root path
|
|
#
|
|
set -- `mount -t nfs`
|
|
while [ $# -ge 1 ] ; do
|
|
if [ "$2" = "on" -a "$3" = "/" ]; then
|
|
nfsroot="$1"
|
|
break
|
|
fi
|
|
shift
|
|
done
|
|
|
|
# The list of directories with template files
|
|
templates="base default"
|
|
if [ -n "${bootp_ipbca}" ]; then
|
|
templates="${templates} ${bootp_ipbca} bcast/${bootp_ipbca}"
|
|
fi
|
|
if [ -n "${class}" ]; then
|
|
templates="${templates} ${class}"
|
|
fi
|
|
if [ -n "${bootp_ipa}" ]; then
|
|
templates="${templates} ${bootp_ipa} ip/${bootp_ipa}"
|
|
fi
|
|
|
|
# If /conf/diskless_remount exists, remount all of /conf.
|
|
handle_remount /conf
|
|
|
|
# Resolve templates in /conf/base, /conf/default, /conf/${bootp_ipbca},
|
|
# and /conf/${bootp_ipa}. For each subdirectory found within these
|
|
# directories:
|
|
#
|
|
# - calculate memory filesystem sizes. If the subdirectory (prior to
|
|
# NFS remounting) contains the file 'md_size', the contents specified
|
|
# in 512 byte sectors will be used to size the memory filesystem. Otherwise
|
|
# 8192 sectors (4MB) is used.
|
|
#
|
|
# - handle NFS remounts. If the subdirectory contains the file
|
|
# diskless_remount, the contents of the file is NFS mounted over
|
|
# the directory. For example /conf/base/etc/diskless_remount
|
|
# might contain 'myserver:/etc'. NFS remounts allow you to avoid
|
|
# having to dup your system directories in /conf. Your server must
|
|
# be sure to export those filesystems -alldirs, however.
|
|
# If the diskless_remount file contains a string beginning with a
|
|
# '/' it is assumed that the local nfsroot should be prepended to
|
|
# it before attemping to the remount. This allows the root to be
|
|
# relocated without needing to change the remount files.
|
|
#
|
|
log "templates are ${templates}"
|
|
for i in ${templates} ; do
|
|
for j in /conf/$i/* ; do
|
|
[ -d $j ] || continue
|
|
|
|
# memory filesystem size specification
|
|
subdir=${j##*/}
|
|
[ -f $j/md_size ] && eval md_size_$subdir=`cat $j/md_size`
|
|
|
|
# remount. Beware, the command is in the file itself!
|
|
if [ -f $j/remount ]; then
|
|
if [ -f $j/remount_subdir ]; then
|
|
k="/conf.tmp/$i/$subdir"
|
|
[ -d $k ] || continue
|
|
|
|
# Mount the filesystem root where the config data is
|
|
# on the temporary mount point.
|
|
nfspt=`/bin/cat $j/remount`
|
|
$nfspt $k
|
|
chkerr $? "$nfspt $k"
|
|
|
|
# Now use a nullfs mount to get the data where we
|
|
# really want to see it.
|
|
remount_subdir=`/bin/cat $j/remount_subdir`
|
|
remount_subdir_cmd="mount -t nullfs $k/$remount_subdir"
|
|
|
|
$remount_subdir_cmd $j
|
|
chkerr $? "$remount_subdir_cmd $j"
|
|
|
|
# XXX check order -- we must force $k to be unmounted
|
|
# after j, as j depends on k.
|
|
to_umount="$j $k ${to_umount}"
|
|
else
|
|
nfspt=`/bin/cat $j/remount`
|
|
$nfspt $j
|
|
chkerr $? "$nfspt $j"
|
|
to_umount="$j ${to_umount}" # XXX hope it is really a mount!
|
|
fi
|
|
fi
|
|
|
|
# NFS remount
|
|
handle_remount $j
|
|
done
|
|
done
|
|
|
|
# - Create all required MFS filesystems and populate them from
|
|
# our templates. Support both a direct template and a dir.cpio.gz
|
|
# archive. Support dir.remove files containing a list of relative
|
|
# paths to remove.
|
|
#
|
|
# The dir.cpio.gz form is there to make the copy process more efficient,
|
|
# so if the cpio archive is present, it prevents the files from dir/
|
|
# from being copied.
|
|
|
|
for i in ${templates} ; do
|
|
for j in /conf/$i/* ; do
|
|
subdir=${j##*/}
|
|
if [ -d $j -a ! -f $j.cpio.gz ]; then
|
|
create_md $subdir
|
|
cp -Rp $j/ /$subdir
|
|
fi
|
|
done
|
|
for j in /conf/$i/*.cpio.gz ; do
|
|
subdir=${j%*.cpio.gz}
|
|
subdir=${subdir##*/}
|
|
if [ -f $j ]; then
|
|
create_md $subdir
|
|
echo "Loading /$subdir from cpio archive $j"
|
|
(cd / ; /rescue/tar -xpf $j)
|
|
fi
|
|
done
|
|
for j in /conf/$i/*.remove ; do
|
|
subdir=${j%*.remove}
|
|
subdir=${subdir##*/}
|
|
if [ -f $j ]; then
|
|
# doubly sure it is a memory disk before rm -rf'ing
|
|
create_md $subdir
|
|
(cd /$subdir; rm -rf `/bin/cat $j`)
|
|
fi
|
|
done
|
|
done
|
|
|
|
# umount partitions used to fill the memory filesystems
|
|
[ -n "${to_umount}" ] && umount $to_umount
|