diff options
Diffstat (limited to 'etc')
| -rw-r--r-- | etc/rc.diskless1 | 217 | ||||
| -rw-r--r-- | etc/rc.diskless2 | 80 |
2 files changed, 198 insertions, 99 deletions
diff --git a/etc/rc.diskless1 b/etc/rc.diskless1 index 3f0433569a4a..3fb22ad5cca1 100644 --- a/etc/rc.diskless1 +++ b/etc/rc.diskless1 @@ -1,57 +1,58 @@ -# Copyright (c) 1999 Matt Dillion -# 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. +# Copyright (c) 1999-2002 Matt Dillion. Terms and conditions based on +# the FreeBSD copyright as found at the base of the source distribution. # # $FreeBSD$ # - -# # /etc/rc.diskless1 - general BOOTP startup # -# We assume that the shared readonly partition has been created with -# the script /usr/share/examples/diskless/clone_root or similar -# methods. -# -# BOOTP has mounted / for us. We assume a read-only mount, and that the -# /conf subdirectory contains the following: -# + /conf/base/etc -# a copy of /etc, prepared by e.g. the clone_root script -# + /conf/default -# default files that override the ones in the readonly root -# + /conf/${ipba} (${ipba} is the subnet broadcast address for the host) -# subnet-specific files that override the ones in the readonly root -# + /conf/${ip} (${ip} is the ip address for the host) -# host-specific files that override the ones in the readonly root -# -# Now we need to do the following: -# + figure out our IP by querying the interface -# + mount /etc as an MFS -# + populate /etc from /conf/base/etc -# + override files in /etc with files from /conf/{default,${ipba},${ip}/etc -# -# The operator is in charge of setting /conf/*/etc/* things as appropriate. -# Typically rc.conf and fstab need to be changed, but possibly -# also other files such as inetd.conf etc. +# On entry to this script the entire system consists of a read-only root +# mounted via NFS. We use the contents of /conf to create and populate +# memory filesystems. The kernel has run BOOTP and configured an interface +# (otherwise it would not have been able to mount the NFS root!) +# +# The following directories are scanned. Each sucessive directory overrides +# (is merged into) the previous one. +# +# /conf/base universal base +# /conf/default modified by a secondary universal base +# /conf/${ipba} modified based on the assigned broadcast IP +# /conf/${ip} modified based on the machine's assigned IP +# +# Each of these directories may contain any number of subdirectories which +# represent directories in / on the diskless machine. The existance of +# these subdirectories causes this script to create a MEMORY FILESYSTEM for +# /<sub_directory_name>. For example, if /conf/base/etc exists then a +# memory filesystem will be created for /etc. +# +# If a subdirectory contains the file 'diskless_remount' the contents of +# the file is used to remount the subdirectory prior to it being copied to +# the memory filesystem. For example, if /conf/base/etc/diskless_remount +# contains the string 'my.server.com:/etc' then my.server.com:/etc will be +# mounted in place of the subdirectory. This allows you to avoid making +# duplicates of system directories in /conf. +# +# If a subdirectory contains the file 'md_size', the contents of the +# file is used to determine the size of the memory filesystem, in 512 +# byte sectors. The default is 8192 (4MB). You only have to specify an +# md_size if the default doesn't work for you (i.e. if it is too big or +# too small). Note that in -current the default is 4096 (2MB). For +# example, /conf/base/etc/md_size might contain '16384'. +# +# If /conf/<special_dir>/SUBDIR.cpio.gz exists, the file is cpio'd into +# the specified /SUBDIR (and a memory filesystem is created for /SUBDIR +# if necessary). +# +# If /conf/<special_dir>/SUBDIR.remove exists, the file contains a list +# of paths which are rm -rf'd relative to /SUBDIR. +# +# You will almost universally want to create a /conf/base/etc containing +# a diskless_remount and possibly an md_size file. You will then almost +# universally want to override rc.conf, rc.local, and fstab by creating +# /conf/default/etc/{rc.conf,rc.local,fstab}. Your fstab should be sure +# to mount a /usr... typically an NFS readonly /usr. +# +# NOTE! rc.diskless2 will create /var, /tmp, and /dev. Those filesystems +# should not be specified in /conf. At least not yet. # chkerr: # @@ -61,19 +62,36 @@ # if shell exits, terminates script as well as /etc/rc. # chkerr() { - case $1 in - 0) - ;; - *) - echo "$2 failed: dropping into /bin/sh" - /bin/sh - # RESUME - ;; - esac + case $1 in + 0) + ;; + *) + echo "$2 failed: dropping into /bin/sh" + /bin/sh + # RESUME + ;; + esac } +# Create a generic memory disk +# mount_md() { - /sbin/mount_mfs -s $1 -T qp120at -b 8192 -f 1024 dummy $2 + /sbin/mount_mfs -s $1 -T qp120at -b 8192 -f 1024 dummy $2 +} + +# Create the memory filesystem if it has not already been created +# +create_md() { + if [ "x`eval echo \\$md_created_$1`" = "x" ]; then + if [ "x`eval echo \$md_size_$1`" = "x" ]; then + md_size=8192 + else + md_size=`eval echo \\$md_size_$1` + fi + mount_md $md_size /$1 + /bin/chmod 755 /$1 + eval md_created_$1=created + fi } # DEBUGGING @@ -103,34 +121,76 @@ for i in ${iflist} ; do done echo "Interface ${bootp_ifc} IP-Address ${bootp_ipa} Broadcast ${bootp_ipbca}" +# Resolve templates in /conf/base, /conf/default, /conf/${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. +# +for i in base default ${bootp_ipbca} ${bootp_ipa} ; do + for j in /conf/$i/* ; do + # memory filesystem size specification + # + subdir=${j##*/} + if [ -d $j -a -f $j/md_size ]; then + eval md_size_$subdir=`cat $j/md_size` + fi -# Create an MFS /tmp to temporarily hold files from /etc until we -# can bootstrap /etc as an MFS. - -mount_md 8192 /etc 0 -chkerr $? "MFS mount on /etc" -/bin/chmod 755 /etc + # NFS remount + # + if [ -d $j -a -f $j/diskless_remount ]; then + nfspt=`/bin/cat $j/diskless_remount` + mount_nfs $nfspt $j + chkerr $? "mount_nfs $nfspt $j" + fi + done +done -# Populate /etc, and then override the base setup with increasingly -# specific files. -# The copy, especially the one with the initial content, touches -# a large number of files, and can be very slow if the server is -# far away. So, if there exists a cpio archive with the proper -# content, use that one instead. +# - 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. # # TODO: # + find a way to assign a 'group' identifier to a machine # so we can use group-specific configurations; -# + implement a way to _delete_ files when overriding configs. for i in base default ${bootp_ipbca} ${bootp_ipa} ; do - if [ -f /conf/${i}/etc.cpio.gz ]; then - echo "Loading ${i}/etc from cpio archive" - (cd / ; /stand/gzip -d < /conf/${i}/etc.cpio.gz | \ - /stand/cpio --extract -d ) - elif [ -d /conf/${i}/etc ]; then - cp -Rp /conf/${i}/etc/* /etc + for j in /conf/$i/* ; do + subdir=${j##*/} + if [ -d $j ]; 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 / ; /stand/gzip -d < $j | /stand/cpio --extract -d ) + fi + done + for j in /conf/$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 # Tell /etc/rc to run the specified script after @@ -141,3 +201,4 @@ done # diskless mount environment. diskless_mount="/etc/rc.diskless2" + diff --git a/etc/rc.diskless2 b/etc/rc.diskless2 index e3abb5a91db6..b49773bb3161 100644 --- a/etc/rc.diskless2 +++ b/etc/rc.diskless2 @@ -34,11 +34,10 @@ # as close as possible between 5-current and 4-stable. # $1 = size # $2 = mount point -# $3 = md unit number (ignored in pre 5.0 systems) -# $4 = (optional) bytes-per-inode +# $3 = (optional) bytes-per-inode mount_md() { - if [ -n "$4" ]; then - bpi="-i $4" + if [ -n "$3" ]; then + bpi="-i $3" fi /sbin/mount_mfs -s $1 -T qp120at -b 8192 -f 1024 $bpi dummy $2 } @@ -52,18 +51,37 @@ elif [ -r /etc/rc.conf ]; then . /etc/rc.conf fi -echo "+++ mfs_mount of /var" -mount_md ${varsize:=65536} /var 1 +# If we do not have a writable /var, create a memory +# filesystem for /var. We don't have /usr yet so +# use mkdir instead of touch to test. We want mount +# to record its mounts so we have to make sure /var/db +# exists before doing the mount -a. +# +if (/bin/mkdir /var/.diskless 2> /dev/null); then + rmdir /var/.diskless +else + echo "+++ mfs_mount of /var" + mount_md ${varsize:=65536} /var +fi + +if [ ! -d /var/db ]; then + mkdir /var/db +fi -mount -a # chown and chgrp are in /usr +# Now we need the rest of our mounts, particularly /usr. +# +mount -a +# Populate /var +# echo "+++ populate /var using /etc/mtree/BSD.var.dist" -/usr/sbin/mtree -deU -f /etc/mtree/BSD.var.dist -p /var +/usr/sbin/mtree -deU -f /etc/mtree/BSD.var.dist -p /var > /dev/null + case ${sendmail_enable} in [Nn][Oo][Nn][Ee]) ;; *) - /usr/sbin/mtree -deU -f /etc/mtree/BSD.sendmail.dist -p / + /usr/sbin/mtree -deU -f /etc/mtree/BSD.sendmail.dist -p / > /dev/null ;; esac @@ -76,24 +94,44 @@ fi echo "+++ create lastlog" /usr/bin/touch /var/log/lastlog +# Make sure our aliases database is uptodate, the aliases may have +# been overriden in /conf. +# +/usr/bin/newaliases + # # XXX make sure to create one dir for each printer as requested by lpd # - -# If /tmp is a symlink, assume it points to somewhere writable, like -# /var/tmp, otherwise, use a small memory filesystem for /tmp. -if [ ! -h /tmp ]; then - mount_md ${tmpsize:=20480} /tmp 2 +# If we do not have a writable /tmp, create a memory +# filesystem for /tmp. If /tmp is a symlink (e.g. to /var/tmp, +# then it should already be writable). +# +if (/bin/mkdir /tmp/.diskless 2> /dev/null); then + rmdir /tmp/.diskless +else + if [ -h /tmp ]; then + echo "*** /tmp is a symlink to a non-writable area!" + echo "dropping into shell, ^D to continue anyway." + /bin/sh + else + mount_md ${tmpsize:=20480} /tmp + chmod 01777 /tmp + fi fi -# Extract a list of device entries, then copy them to a writable fs. -# The list can be long, so if there is already a cpio archive prepared -# for us, use that one instead. +# If /dev has already been created in rc.diskless1 it will be writable +# and we do nothing. If /dev is not writable then we have to dup it as +# a memory filesystem. +# +# note: /conf/dev.cpio.gz is no longer valid. Use /conf/base/dev.cpio.gz +# instead and it will be handled in rc.diskless1 -if [ -f /conf/dev.cpio.gz ] ; then - ln -s /conf/dev.cpio.gz /tmp/dev.cpio.gz +if (/bin/mkdir /dev/.diskless 2> /dev/null); then + rmdir /dev/.diskless else (cd /; find -x dev | cpio --create -H newc | gzip) > /tmp/dev.cpio.gz + mount_md 4096 /dev 512 + (cd /; gzip -dc /tmp/dev.cpio.gz | cpio --extract -H newc -d ) + rm -f /tmp/dev.cpio.gz fi -mount_md 4096 /dev 3 512 -(cd /; gzip -dc /tmp/dev.cpio.gz | cpio --extract -H newc -d ) + |