241 lines
7.9 KiB
Bash
241 lines
7.9 KiB
Bash
#!/bin/sh
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#
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# Copyright (c) 1999 Matt Dillon
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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# $FreeBSD$
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#
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# PROVIDE: initdiskless
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# KEYWORD: FreeBSD nojail
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# On entry to this script the entire system consists of a read-only root
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# mounted via NFS. We use the contents of /conf to create and populate
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# memory filesystems. The kernel has run BOOTP and configured an interface
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# (otherwise it would not have been able to mount the NFS root!)
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#
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# The following directories are scanned. Each sucessive directory overrides
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# (is merged into) the previous one.
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#
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# /conf/base universal base
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# /conf/default modified by a secondary universal base
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# /conf/${ipba} modified based on the assigned broadcast IP
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# /conf/${ip} modified based on the machine's assigned IP
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#
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# Each of these directories may contain any number of subdirectories which
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# represent directories in / on the diskless machine. The existance of
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# these subdirectories causes this script to create a MEMORY FILESYSTEM for
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# /<sub_directory_name>. For example, if /conf/base/etc exists then a
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# memory filesystem will be created for /etc.
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#
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# If a subdirectory contains the file 'diskless_remount' the contents of
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# the file is used to remount the subdirectory prior to it being copied to
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# the memory filesystem. For example, if /conf/base/etc/diskless_remount
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# contains the string 'my.server.com:/etc' then my.server.com:/etc will be
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# mounted in place of the subdirectory. This allows you to avoid making
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# duplicates of system directories in /conf.
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#
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# If a subdirectory contains the file 'md_size', the contents of the
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# file is used to determine the size of the memory filesystem, in 512
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# byte sectors. The default is 10240 (5MB). You only have to specify an
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# md_size if the default doesn't work for you (i.e. if it is too big or
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# too small). For example, /conf/base/etc/md_size might contain '16384'.
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#
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# If /conf/<special_dir>/SUBDIR.cpio.gz exists, the file is cpio'd into
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# the specified /SUBDIR (and a memory filesystem is created for /SUBDIR
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# if necessary).
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#
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# If /conf/<special_dir>/SUBDIR.remove exists, the file contains a list
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# of paths which are rm -rf'd relative to /SUBDIR.
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#
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# You will almost universally want to create a /conf/base/etc containing
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# a diskless_remount and possibly an md_size file. You will then almost
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# universally want to override rc.conf, rc.local, and fstab by creating
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# /conf/default/etc/{rc.conf,rc.local,fstab}. Your fstab should be sure
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# to mount a /usr... typically an NFS readonly /usr.
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#
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# NOTE! /etc/rc.d/diskless will create /var, /tmp, and /dev.
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# Those filesystems should not be specified in /conf. At least not yet.
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dlv=`/sbin/sysctl -n vfs.nfs.diskless_valid 2> /dev/null`
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[ ${dlv:=0} -eq 0 ] && exit 0
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# chkerr:
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#
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# Routine to check for error
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#
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# checks error code and drops into shell on failure.
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# if shell exits, terminates script as well as /etc/rc.
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#
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chkerr() {
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case $1 in
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0)
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;;
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*)
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echo "$2 failed: dropping into /bin/sh"
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/bin/sh
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# RESUME
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;;
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esac
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}
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# Create a generic memory disk
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#
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mount_md() {
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/sbin/mdmfs -i 4096 -s $1 -M md $2
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}
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# Create the memory filesystem if it has not already been created
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#
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create_md() {
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if [ "x`eval echo \\$md_created_$1`" = "x" ]; then
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if [ "x`eval echo \\$md_size_$1`" = "x" ]; then
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md_size=10240
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else
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md_size=`eval echo \\$md_size_$1`
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fi
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mount_md $md_size /$1
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/bin/chmod 755 /$1
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eval md_created_$1=created
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fi
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}
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# DEBUGGING
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#
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# set -v
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# Figure out our interface and IP.
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#
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bootp_ifc=""
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bootp_ipa=""
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bootp_ipbca=""
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iflist=`ifconfig -l`
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for i in ${iflist} ; do
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set `ifconfig ${i}`
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while [ $# -ge 1 ] ; do
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if [ "${bootp_ifc}" = "" -a "$1" = "inet" ] ; then
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bootp_ifc=${i} ; bootp_ipa=${2} ; shift
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fi
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if [ "${bootp_ipbca}" = "" -a "$1" = "broadcast" ] ; then
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bootp_ipbca=$2; shift
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fi
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shift
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done
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if [ "${bootp_ifc}" != "" ] ; then
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break
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fi
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done
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echo "Interface ${bootp_ifc} IP-Address ${bootp_ipa} Broadcast ${bootp_ipbca}"
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# Figure out our NFS root path
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#
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set `mount -t nfs`
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while [ $# -ge 1 ] ; do
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if [ "$2" = "on" -a "$3" = "/" ]; then
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nfsroot="$1"
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break
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fi
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shift
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done
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# Resolve templates in /conf/base, /conf/default, /conf/${bootp_ipbca},
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# and /conf/${bootp_ipa}. For each subdirectory found within these
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# directories:
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#
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# - calculate memory filesystem sizes. If the subdirectory (prior to
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# NFS remounting) contains the file 'md_size', the contents specified
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# in 512 byte sectors will be used to size the memory filesystem. Otherwise
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# 8192 sectors (4MB) is used.
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#
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# - handle NFS remounts. If the subdirectory contains the file
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# diskless_remount, the contents of the file is NFS mounted over
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# the directory. For example /conf/base/etc/diskless_remount
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# might contain 'myserver:/etc'. NFS remounts allow you to avoid
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# having to dup your system directories in /conf. Your server must
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# be sure to export those filesystems -alldirs, however.
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# If the diskless_remount file contains a string beginning with a
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# '/' it is assumed that the local nfsroot should be prepended to
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# it before attemping to the remount. This allows the root to be
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# relocated without needing to change the remount files.
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#
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for i in base default ${bootp_ipbca} ${bootp_ipa} ; do
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for j in /conf/$i/* ; do
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# memory filesystem size specification
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#
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subdir=${j##*/}
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if [ -d $j -a -f $j/md_size ]; then
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eval md_size_$subdir=`cat $j/md_size`
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fi
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# NFS remount
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#
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if [ -d $j -a -f $j/diskless_remount ]; then
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nfspt=`/bin/cat $j/diskless_remount`
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if [ `expr "$nfspt" : '\(.\)'` = "/" ]; then
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nfspt="${nfsroot}${nfspt}"
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fi
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mount_nfs $nfspt $j
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chkerr $? "mount_nfs $nfspt $j"
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fi
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done
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done
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# - Create all required MFS filesystems and populate them from
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# our templates. Support both a direct template and a dir.cpio.gz
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# archive. Support dir.remove files containing a list of relative
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# paths to remove.
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#
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# TODO:
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# + find a way to assign a 'group' identifier to a machine
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# so we can use group-specific configurations;
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for i in base default ${bootp_ipbca} ${bootp_ipa} ; do
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for j in /conf/$i/* ; do
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subdir=${j##*/}
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if [ -d $j ]; then
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create_md $subdir
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cp -Rp $j/* /$subdir
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fi
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done
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for j in /conf/$i/*.cpio.gz ; do
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subdir=${j%*.cpio.gz}
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subdir=${subdir##*/}
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if [ -f $j ]; then
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create_md $subdir
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echo "Loading /$subdir from cpio archive $j"
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(cd / ; /stand/gzip -d < $j | /stand/cpio --extract -d )
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fi
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done
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for j in /conf/$i/*.remove ; do
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subdir=${j%*.remove}
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subdir=${subdir##*/}
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if [ -f $j ]; then
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# doubly sure it is a memory disk before rm -rf'ing
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create_md $subdir
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(cd /$subdir; rm -rf `/bin/cat $j`)
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fi
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done
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done
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