diff options
Diffstat (limited to 'etc/rc.initdiskless')
| -rw-r--r-- | etc/rc.initdiskless | 231 |
1 files changed, 156 insertions, 75 deletions
diff --git a/etc/rc.initdiskless b/etc/rc.initdiskless index faa2acb..5ddc768 100644 --- a/etc/rc.initdiskless +++ b/etc/rc.initdiskless @@ -26,24 +26,61 @@ # # $FreeBSD$ # - # PROVIDE: initdiskless # KEYWORD: FreeBSD -dlv=`/sbin/sysctl -n vfs.nfs.diskless_valid 2> /dev/null` -[ ${dlv:=0} -eq 0 ] && exit 0 - + +# On entry to this script the entire system consists of a read-only root +# mounted via NFS. We use the contents of /conf to create and populate +# memory filesystems. The kernel has run BOOTP and configured an interface +# (otherwise it would not have been able to mount the NFS root!) +# +# The following directories are scanned. Each sucessive directory overrides +# (is merged into) the previous one. +# +# /conf/base universal base +# /conf/default modified by a secondary universal base +# /conf/${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. # -# BOOTP has mounted / for us. Assume a read-only mount. We must then -# - figure out our IP by querying the interface -# - mount /etc as an MFS -# - populate /etc from /conf/default version -# - override files in /etc with files from /conf/*/etc where -# '*' is default, netmask of client, ip-address of client +# 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'. # -# 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. +# 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. + +dlv=`/sbin/sysctl -n vfs.nfs.diskless_valid 2> /dev/null` +[ ${dlv:=0} -eq 0 ] && exit 0 # chkerr: # @@ -52,22 +89,37 @@ dlv=`/sbin/sysctl -n vfs.nfs.diskless_valid 2> /dev/null` # checks error code and drops into shell on failure. # 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 +chkerr() { + case $1 in + 0) + ;; + *) + echo "$2 failed: dropping into /bin/sh" + /bin/sh + # RESUME + ;; + esac } -mount_md() -{ - /sbin/mdmfs -i 4096 -s $1 -M md$3 $2 +# Create a generic memory disk +# +mount_md() { + /sbin/mdmfs -i 4096 -s $1 -M md $2 +} + +# Create the memory filesystem if it has not already been created +# +create_md() { + if [ "x`eval echo \\$md_created_$1`" = "x" ]; then + if [ "x`eval echo \$md_size_$1`" = "x" ]; then + md_size=4096 + else + md_size=`eval echo \\$md_size_$1` + fi + mount_md $md_size /$1 + /bin/chmod 755 /$1 + eval md_created_$1=created + fi } # DEBUGGING @@ -81,62 +133,91 @@ bootp_ipa="" bootp_ipbca="" 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 + 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 echo "Interface ${bootp_ifc} IP-Address ${bootp_ipa} Broadcast ${bootp_ipbca}" -if [ -z "`hostname -s`" ]; then - hostname=`kenv dhcp.host-name` - hostname $hostname - echo "Hostname is $hostname" -fi - -if [ -d /conf/default/etc ]; then - mount_md 4096 /etc 0 - chkerr $? "MFS mount on /etc" - /bin/chmod 755 /etc - - /bin/cp -Rp /conf/default/etc/* /etc - chkerr $? "cp /conf/default/etc to /etc MFS" -fi - -# Allow for override files to replace files in /etc. Use /conf/*/etc to find -# the override files. First choice is default files that # always override, -# then files that from the directory that matches the client's broadcast -# address, finally followed by overrides that match the client's IP address. +# Resolve templates in /conf/base, /conf/default, /conf/${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. # -# This way we have some flexibility to handle clusters of machines on -# separate subnets. +# - 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 -for i in ${bootp_ipbca} ${bootp_ipa} ${hostname} ; do - if [ -d /conf/${i}/etc ]; then - cp -Rp /conf/${i}/etc/* /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 +# - 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. # -# if the info is available via dhcp/kenv -# build the resolv.conf -# -if [ ! -e /etc/resolv.conf ]; then - echo domain `kenv dhcp.domain-name` > /etc/resolv.conf +# TODO: +# + find a way to assign a 'group' identifier to a machine +# so we can use group-specific configurations; - set `kenv dhcp.domain-name-servers` - for ns in `IFS=','; echo $*`; do - echo nameserver $ns >> /etc/resolv.conf; - done -fi +for i in base default ${bootp_ipbca} ${bootp_ipa} ; do + for j in /conf/$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 -exit 2 # Tell /etc/rc to re-source rc.conf |
