X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=build.sh;h=bff2262edfcd0ac6103639486bcee1b67ad7b569;hb=38d28a2ffec0d8715e69c76d7e71e0736a0c3ce6;hp=09fac148944665f345e1a27a50115de80ad5b7d0;hpb=a8d579eef01f8e2b272c5c77ffbe287820d0d0e8;p=bootcd.git

diff --git a/build.sh b/build.sh
index 09fac14..bff2262 100755
--- a/build.sh
+++ b/build.sh
@@ -1,254 +1,549 @@
 #!/bin/bash
+#
+# Builds custom BootCD ISO and USB images in the current
+# directory. For backward compatibility, if an old-style static
+# configuration is specified, that configuration file will be parsed
+# instead of the current PLC configuration in
+# /etc/planetlab/plc_config.
+#
+# Aaron Klingaman <alk@absarokasoft.com>
+# Mark Huang <mlhuang@cs.princeton.edu>
+# Copyright (C) 2004-2006 The Trustees of Princeton University
+#
+# $Id: build.sh,v 1.40 2006/07/25 23:51:39 mlhuang Exp $
+#
+
+PATH=/sbin:/bin:/usr/sbin:/usr/bin
+
+CONFIGURATION=default
+NODE_CONFIGURATION_FILE=
+ALL=0
+
+usage()
+{
+    echo "Usage: build.sh [OPTION]..."
+    echo "	-c name		(Deprecated) Static configuration to use (default: $CONFIGURATION)"
+    echo "	-f planet.cnf	Node to customize CD for (default: none)"
+    echo "      -a              Build all images (default: only base images)"
+    echo "	-h		This message"
+    exit 1
+}
 
+# Get options
+while getopts "c:f:ah" opt ; do
+    case $opt in
+	c)
+	    CONFIGURATION=$OPTARG
+	    ;;
+	f)
+	    NODE_CONFIGURATION_FILE=$OPTARG
+	    ;;
+	a)
+	    ALL=1
+	    ;;
+	h|*)
+	    usage
+	    ;;
+    esac
+done
+
+# Do not tolerate errors
 set -e
 
-BOOTCD_VERSION="3.0-beta0.3"
-FULL_VERSION_STRING="PlanetLab BootCD $BOOTCD_VERSION"
-
-# which boot server to contact
-BOOTSERVER='boot.planet-lab.org'
-
-# and on which port (protocol will be https)
-BOOTSERVER_PORT='443'
-
-# finally, what path to request from the server
-BOOTSERVER_PATH='boot/'
-
-SYSLINUX_SRC=sources/syslinux-2.11.tar.bz2
-
-ISO=cd.iso
-
-CD_ROOT=`pwd`/cdroot
-ROOT_PASSWD='$1$IdEn2srw$/TfrjZSPUC1xP244YCuIi0'
+# Change to our source directory
+srcdir=$(cd $(dirname $0) && pwd -P)
+pushd $srcdir
 
-BOOTCD_YUM_GROUP=BootCD
+# Root of the isofs
+isofs=$PWD/build/isofs
 
-CDRECORD_FLAGS="-v -dao"
-
-CONF_FILES_DIR=conf_files/
-
-# location of the uncompressed ramdisk image
-INITRD=$CD_ROOT/usr/isolinux/initrd
-
-# temporary mount point for rd
-INITRD_MOUNT=`pwd`/rd
+# Build reference image if it does not exist. This should only need to
+# be executed once at build time, never at run time.
+if [ ! -f $isofs/bootcd.img ] ; then
+    ./prep.sh
+fi
 
-# size of the ram disk in MB
-RAMDISK_SIZE=64
+# build/version.txt written by prep.sh
+BOOTCD_VERSION=$(cat build/version.txt)
 
-# the bytes per inode ratio (the -i value in mkfs.ext2) for the ramdisk
-INITRD_BYTES_PER_INODE=1024
+if [ -f /etc/planetlab/plc_config ] ; then
+    # Source PLC configuration
+    . /etc/planetlab/plc_config
+fi
 
+### This support for backwards compatibility can be taken out in the
+### future. RC1 based MyPLCs set $PLC_BOOT_SSL_CRT in the plc_config
+### file, but >=RC2 based bootcd assumes that $PLC_BOOT_CA_SSL_CRT is
+### set.
+if [ -z "$PLC_BOOT_CA_SSL_CRT" -a ! -z "$PLC_BOOT_SSL_CRT" ] ; then
+    PLC_BOOT_CA_SSL_CRT=$PLC_BOOT_SSL_CRT
+fi
 
-function build_cdroot()
-{
-    if [ -f $CD_ROOT/.built ]; then
-	echo "cd root already built, skipping"
-	return
+# If PLC configuration is not valid, try a static configuration
+if [ -z "$PLC_BOOT_CA_SSL_CRT" -a -d configurations/$CONFIGURATION ] ; then
+    # (Deprecated) Source static configuration
+    . configurations/$CONFIGURATION/configuration
+    PLC_NAME="PlanetLab"
+    PLC_MAIL_SUPPORT_ADDRESS="support@planet-lab.org"
+    PLC_WWW_HOST="www.planet-lab.org"
+    PLC_WWW_PORT=80
+    if [ -n "$EXTRA_VERSION" ] ; then
+	BOOTCD_VERSION="$BOOTCD_VERSION $EXTRA_VERSION"
     fi
-
-    clean
-    
-    mkdir -p $CD_ROOT/dev/pts
-    mkdir -p $CD_ROOT/proc
-    mkdir -p $CD_ROOT/etc
-
-    echo "copy fstab and mtab"
-    cp -f $CONF_FILES_DIR/fstab $CD_ROOT/etc/
-    cp -f $CONF_FILES_DIR/mtab $CD_ROOT/etc/
-
-    echo "setup rpm to install only en_US locale and no docs"
-    mkdir -p $CD_ROOT/etc/rpm
-    cp -f $CONF_FILES_DIR/macros $CD_ROOT/etc/rpm
-
-    echo "initialize rpm db"
-    mkdir -p $CD_ROOT/var/lib/rpm
-    rpm --root $CD_ROOT --initdb
-
-    echo "install boot cd base rpms"
-    yum -c yum.conf --installroot=$CD_ROOT -y groupinstall $BOOTCD_YUM_GROUP
-
-    echo "checking to make sure rpms were installed"
-    packages=`cat yumgroups.xml | grep packagereq | sed 's#<[^<]*>##g'`
-    set +e
-    for package in $packages; do
-	echo "checking for package $package"
-	chroot $CD_ROOT /bin/rpm -qi $package > /dev/null
-	if [[ "$?" -ne 0 ]]; then
-	    echo "package $package was not installed in the cd root."
-	    echo "make sure it exists in the yum repository."
-	    exit 1
-	fi
-    done
-    set -e
-    
-    echo "removing unneccessary build files"
-    (cd $CD_ROOT/lib/modules && \
-	find ./ -type d -name build -maxdepth 2 -exec rm -rf {} \;)
-
-    echo "setting up non-ssh authentication"
-    mkdir -p $CD_ROOT/etc/samba
-    chroot $CD_ROOT /usr/sbin/authconfig --nostart --kickstart \
-	--enablemd5 --enableshadow
-
-    echo "setting root password"
-    sed -i "s#root::#root:$ROOT_PASSWD:#g" $CD_ROOT/etc/shadow
-
-    echo "relocate some large directories out of the root system"
-    # get /var/lib/rpm out, its 12mb. create in its place a 
-    # symbolic link to /usr/relocated/var/lib/rpm
-    mkdir -p $CD_ROOT/usr/relocated/var/lib/
-    mv $CD_ROOT/var/lib/rpm $CD_ROOT/usr/relocated/var/lib/
-    (cd $CD_ROOT/var/lib && ln -s ../../usr/relocated/var/lib/rpm rpm)
-
-    # get /lib/tls out
-    mkdir -p $CD_ROOT/usr/relocated/lib
-    mv $CD_ROOT/lib/tls $CD_ROOT/usr/relocated/lib/
-    (cd $CD_ROOT/lib && ln -s ../usr/relocated/lib/tls tls)
-
-    echo "extracting syslinux, copying isolinux files to cd"
-    mkdir -p syslinux
-    mkdir -p $CD_ROOT/usr/isolinux/
-    tar -C syslinux -xjvf $SYSLINUX_SRC
-    find syslinux -name isolinux.bin -exec cp -f {} $CD_ROOT/usr/isolinux/ \;
-
-    echo "moving kernel to isolinux directory"
-    KERNEL=$CD_ROOT/boot/vmlinuz-*
-    mv -f $KERNEL $CD_ROOT/usr/isolinux/kernel
-
-    echo "creating version files"
-    echo "$FULL_VERSION_STRING" > $CD_ROOT/usr/isolinux/pl_version
-    echo "$FULL_VERSION_STRING" > $CD_ROOT/pl_version
-
-    touch $CD_ROOT/.built
-}
-
-function build_initrd()
-{
-    echo "building initrd"
-    rm -f $INITRD
-    rm -f $INITRD.gz
-
-    echo "copy fstab and mtab"
-    cp -f $CONF_FILES_DIR/fstab $CD_ROOT/etc/
-    cp -f $CONF_FILES_DIR/mtab $CD_ROOT/etc/
-
-    echo "installing generic modprobe.conf"
-    cp -f $CONF_FILES_DIR/modprobe.conf $CD_ROOT/etc/
-
-    echo "installing our own inittab and init scripts"
-    cp -f $CONF_FILES_DIR/inittab $CD_ROOT/etc
-    init_scripts="pl_sysinit pl_hwinit pl_netinit pl_validateconf pl_boot"
-    for script in $init_scripts; do
-	cp -f $CONF_FILES_DIR/$script $CD_ROOT/etc/init.d/
-	chmod +x $CD_ROOT/etc/init.d/$script
-    done
-
-    echo "setup basic networking files"
-    cp -f $CONF_FILES_DIR/hosts $CD_ROOT/etc/
-
-    echo "copying sysctl.conf (fix tcp window scaling and broken routers)"
-    cp -f $CONF_FILES_DIR/sysctl.conf $CD_ROOT/etc/
-
-    echo "setup default network conf file"
-    mkdir -p $CD_ROOT/usr/boot
-    cp -f $CONF_FILES_DIR/default-net.cnf $CD_ROOT/usr/boot/
-
-    echo "setup boot server configuration"
-    cp -f $CONF_FILES_DIR/cacert.pem $CD_ROOT/usr/boot/
-    cp -f $CONF_FILES_DIR/pubring.gpg $CD_ROOT/usr/boot/
-    echo "$BOOTSERVER" > $CD_ROOT/usr/boot/boot_server
-    echo "$BOOTSERVER_PORT" > $CD_ROOT/usr/boot/boot_server_port
-    echo "$BOOTSERVER_PATH" > $CD_ROOT/usr/boot/boot_server_path
-
-    echo "copying old boot cd directory bootme (TEMPORARY)"
-    cp -r bootme_old $CD_ROOT/usr/bootme
-
-    echo "forcing lvm to make lvm1 partitions (TEMPORARY)"
-    cp -f $CONF_FILES_DIR/lvm.conf $CD_ROOT/etc/lvm/
-
-    echo "copying isolinux configuration files"
-    cp -f $CONF_FILES_DIR/isolinux.cfg $CD_ROOT/usr/isolinux/
-    echo "$FULL_VERSION_STRING" > $CD_ROOT/usr/isolinux/message.txt
-
-    echo "writing /etc/issue"
-    echo "$FULL_VERSION_STRING" > $CD_ROOT/etc/issue
-    echo "Kernel \r on an \m" >> $CD_ROOT/etc/issue
-    echo "" >> $CD_ROOT/etc/issue
-    echo "" >> $CD_ROOT/etc/issue
-
-    echo "making the isolinux initrd kernel command line match rd size"
-    let INITRD_SIZE_KB=$(($RAMDISK_SIZE * 1024))
-    sed -i "s#ramdisk_size=0#ramdisk_size=$INITRD_SIZE_KB#g" \
-	$CD_ROOT/usr/isolinux/isolinux.cfg
-
-    echo "building pcitable for hardware detection"
-    pci_map_file=`find $CD_ROOT/lib/modules/ -name modules.pcimap | head -1`
-    module_dep_file=`find $CD_ROOT/lib/modules/ -name modules.dep | head -1`
-    pci_table=$CD_ROOT/usr/share/hwdata/pcitable
-    ./scripts/rewrite-pcitable.py $module_dep_file $pci_map_file $pci_table \
-	$CD_ROOT/etc/pl_pcitable
-
-    dd if=/dev/zero of=$INITRD bs=1M count=$RAMDISK_SIZE
-    mkfs.ext2 -F -m 0 -i $INITRD_BYTES_PER_INODE $INITRD
-    mkdir -p $INITRD_MOUNT
-    mount -o loop,rw $INITRD $INITRD_MOUNT
-
-    echo "copy all files except usr to ramdisk"
-    pushd .
-    cd $CD_ROOT
-    find . -path ./usr -prune -o -print | cpio -p -d -u $INITRD_MOUNT
-    popd
-
-    umount $INITRD_MOUNT
-    rmdir $INITRD_MOUNT
-    
-    echo "compressing ramdisk"
-    gzip $INITRD
-}
-
-function build_iso()
-{
-    echo "building iso"
-    rm -f $ISO
-    mkisofs -o $ISO -R -allow-leading-dots -J -r -b isolinux/isolinux.bin \
-	-c isolinux/boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table \
-	-V PlanetLab-3-0 $CD_ROOT/usr
-}
-
-function burn()
-{
-    cdrecord $CDRECORD_FLAGS -data $ISO
-}
-
-function clean()
-{
-    echo "removing built files"
-    rm -rf cdroot
-    rm -rf syslinux
-    rm -rf $INITRD_MOUNT
-    rm -f $ISO
-}
-
-
-if [ "$1" == "clean" ]; then
-    clean
-    exit
+    PLC_BOOT_HOST=$PRIMARY_SERVER
+    PLC_BOOT_SSL_PORT=$PRIMARY_SERVER_PORT
+    PLC_BOOT_CA_SSL_CRT=configurations/$CONFIGURATION/$PRIMARY_SERVER_CERT
+    PLC_ROOT_GPG_KEY_PUB=configurations/$CONFIGURATION/$PRIMARY_SERVER_GPG
 fi
 
-if [ "$1" == "burn" ]; then
-    burn
-    exit
+FULL_VERSION_STRING="$PLC_NAME BootCD $BOOTCD_VERSION"
+
+echo "* Building images for $FULL_VERSION_STRING"
+
+# From within a myplc chroot /tmp is too small to build
+# all possible images, whereas /data is part of the host
+# filesystem and usually has sufficient space.  What we
+# should do is check whether the expected amount of space
+# is available.
+[ -d /data ] && BUILDTMP=/data || BUILDTMP=/tmp
+
+# Root of the ISO and USB images
+echo "* Populating root filesystem..."
+overlay=$(mktemp -d ${BUILDTMP}/overlay.XXXXXX)
+install -d -m 755 $overlay
+trap "rm -rf $overlay" ERR INT
+
+# Create version files
+echo "* Creating version files"
+
+# Boot Manager compares pl_version in both places to make sure that
+# the right CD is mounted. We used to boot from an initrd and mount
+# the CD on /usr. Now we just run everything out of the initrd.
+for file in $overlay/pl_version $overlay/usr/isolinux/pl_version ; do
+    mkdir -p $(dirname $file)
+    echo "$FULL_VERSION_STRING" >$file
+done
+
+# Install boot server configuration files
+echo "* Installing boot server configuration files"
+
+# We always intended to bring up and support backup boot servers,
+# but never got around to it. Just install the same parameters for
+# both for now.
+for dir in $overlay/usr/boot $overlay/usr/boot/backup ; do
+	install -D -m 644 $PLC_BOOT_CA_SSL_CRT $dir/cacert.pem
+	install -D -m 644 $PLC_ROOT_GPG_KEY_PUB $dir/pubring.gpg
+	echo "$PLC_BOOT_HOST" >$dir/boot_server
+	echo "$PLC_BOOT_SSL_PORT" >$dir/boot_server_port
+	echo "/boot/" >$dir/boot_server_path
+done
+
+# (Deprecated) Install old-style boot server configuration files
+install -D -m 644 $PLC_BOOT_CA_SSL_CRT $overlay/usr/bootme/cacert/$PLC_BOOT_HOST/cacert.pem
+echo "$FULL_VERSION_STRING" >$overlay/usr/bootme/ID
+echo "$PLC_BOOT_HOST" >$overlay/usr/bootme/BOOTSERVER
+echo "$PLC_BOOT_HOST" >$overlay/usr/bootme/BOOTSERVER_IP
+echo "$PLC_BOOT_SSL_PORT" >$overlay/usr/bootme/BOOTPORT
+
+# Generate /etc/issue
+echo "* Generating /etc/issue"
+
+if [ "$PLC_WWW_PORT" = "443" ] ; then
+    PLC_WWW_URL="https://$PLC_WWW_HOST/"
+elif [ "$PLC_WWW_PORT" != "80" ] ; then
+    PLC_WWW_URL="http://$PLC_WWW_HOST:$PLC_WWW_PORT/"
+else
+    PLC_WWW_URL="http://$PLC_WWW_HOST/"
 fi
 
-if [ "$1" == "force" ]; then
-    clean
+mkdir -p $overlay/etc
+cat >$overlay/etc/issue <<EOF
+$FULL_VERSION_STRING
+$PLC_NAME Node: \n
+Kernel \r on an \m
+$PLC_WWW_URL
+
+This machine is a node in the $PLC_NAME distributed network.  It has
+not fully booted yet. If you have cancelled the boot process at the
+request of $PLC_NAME Support, please follow the instructions provided
+to you. Otherwise, please contact $PLC_MAIL_SUPPORT_ADDRESS.
+
+Console login at this point is restricted to root. Provide the root
+password of the default $PLC_NAME Central administrator account at the
+time that this CD was created.
+
+EOF
+
+# Set root password
+echo "* Setting root password"
+
+if [ -z "$ROOT_PASSWORD" ] ; then
+    # Generate an encrypted password with crypt() if not defined
+    # in a static configuration.
+    ROOT_PASSWORD=$(python <<EOF
+import crypt, random, string
+salt = [random.choice(string.letters + string.digits + "./") for i in range(0,8)]
+print crypt.crypt('$PLC_ROOT_PASSWORD', '\$1\$' + "".join(salt) + '\$')
+EOF
+)
 fi
 
-# build base image via yum
-build_cdroot
+# build/passwd copied out by prep.sh
+sed -e "s@^root:[^:]*:\(.*\)@root:$ROOT_PASSWORD:\1@" build/passwd \
+    >$overlay/etc/passwd
 
-# always build/rebuild initrd
-build_initrd
+# Install node configuration file (e.g., if node has no floppy disk or USB slot)
+if [ -f "$NODE_CONFIGURATION_FILE" ] ; then
+    echo "* Installing node configuration file"
+    install -D -m 644 $NODE_CONFIGURATION_FILE $overlay/usr/boot/plnode.txt
+fi
 
-build_iso
+# Pack overlay files into a compressed archive
+echo "* Compressing overlay image"
+(cd $overlay && find . | cpio --quiet -c -o) | gzip -9 >$isofs/overlay.img
+
+rm -rf $overlay
+trap - ERR INT
+
+# Calculate ramdisk size (total uncompressed size of both archives)
+ramdisk_size=$(gzip -l $isofs/bootcd.img $isofs/overlay.img | tail -1 | awk '{ print $2; }') # bytes
+ramdisk_size=$((($ramdisk_size + 1023) / 1024)) # kilobytes
+
+# Write isolinux configuration
+echo "$FULL_VERSION_STRING" >$isofs/pl_version
+cat >$isofs/isolinux.cfg <<EOF
+DEFAULT kernel
+APPEND ramdisk_size=$ramdisk_size initrd=bootcd.img,overlay.img root=/dev/ram0 rw
+DISPLAY pl_version
+PROMPT 0
+TIMEOUT 40
+EOF
+
+# Change back to output directory
+popd
+
+# Create ISO image
+echo "* Creating ISO image"
+iso="$PLC_NAME-BootCD-$BOOTCD_VERSION.iso"
+mkisofs -o "$iso" \
+    -R -allow-leading-dots -J -r \
+    -b isolinux.bin -c boot.cat \
+    -no-emul-boot -boot-load-size 4 -boot-info-table \
+    $isofs
+
+echo "* Creating ISO image with serial line support"
+iso="$PLC_NAME-BootCD-$BOOTCD_VERSION-serial.iso"
+cat >$isofs/isolinux.cfg <<EOF
+SERIAL 0 115200
+PROMPT 0
+TIMEOUT 120
+DISPLAY pl_version
+DEFAULT serial
+LABEL serial
+	KERNEL kernel
+	APPEND ramdisk_size=$ramdisk_size initrd=bootcd.img,overlay.img root=/dev/ram0 rw  console=ttyS0,115200n8
+EOF
+mkisofs -o "$iso" \
+    -R -allow-leading-dots -J -r \
+    -b isolinux.bin -c boot.cat \
+    -no-emul-boot -boot-load-size 4 -boot-info-table \
+    $isofs
+
+# Create USB image
+echo -n "* Creating USB image... "
+usb="$PLC_NAME-BootCD-$BOOTCD_VERSION.usb"
+
+# Leave 1 MB of free space on the VFAT filesystem
+mkfs.vfat -C "$usb" $(($(du -sk $isofs | awk '{ print $1; }') + 1024))
+
+# Mount it
+tmp=$(mktemp -d ${BUILDTMP}/bootcd.XXXXXX)
+mount -o loop "$usb" $tmp
+trap "umount $tmp; rm -rf $tmp" ERR INT
+
+# Populate it
+echo -n " populating USB image... "
+(cd $isofs && find . | cpio -p -d -u $tmp/)
+
+# Use syslinux instead of isolinux to make the image bootable
+rm -f $tmp/isolinux.cfg
+cat >$tmp/syslinux.cfg <<EOF
+DEFAULT kernel
+APPEND ramdisk_size=$ramdisk_size initrd=bootcd.img,overlay.img root=/dev/ram0 rw
+DISPLAY pl_version
+PROMPT 0
+TIMEOUT 40
+EOF
+umount $tmp
+rmdir $tmp
+trap - ERR INT
+
+echo "making USB image bootable."
+$srcdir/syslinux/unix/syslinux "$usb"
+
+
+# Create USB image with serial line support
+echo -n "* Creating USB image... "
+usb="$PLC_NAME-BootCD-$BOOTCD_VERSION-serial.usb"
+
+# Leave 1 MB of free space on the VFAT filesystem
+mkfs.vfat -C "$usb" $(($(du -sk $isofs | awk '{ print $1; }') + 1024))
+
+# Mount it
+tmp=$(mktemp -d ${BUILDTMP}/bootcd.XXXXXX)
+mount -o loop "$usb" $tmp
+trap "umount $tmp; rm -rf $tmp" ERR INT
+
+# Populate it
+echo -n " populating USB image... "
+(cd $isofs && find . | cpio -p -d -u $tmp/)
+
+# Use syslinux instead of isolinux to make the image bootable
+rm -f $tmp/isolinux.cfg
+cat >$tmp/syslinux.cfg <<EOF
+SERIAL 0 115200
+PROMPT 0
+TIMEOUT 120
+DISPLAY pl_version
+DEFAULT serial
+LABEL serial
+	KERNEL kernel
+	APPEND ramdisk_size=$ramdisk_size initrd=bootcd.img,overlay.img root=/dev/ram0 rw  console=ttyS0,115200n8
+EOF
+
+umount $tmp
+rmdir $tmp
+trap - ERR INT
+
+echo "making USB image with serial line support bootable."
+$srcdir/syslinux/unix/syslinux "$usb"
+
+[ $ALL -eq 0 ] && exit 0
+
+# Setup CRAMFS related support
+echo "* Setting up CRAMFS-based images"
+tmp=$(mktemp -d ${BUILDTMP}/bootcd.XXXXXX)
+cramfs=$(mktemp ${BUILDTMP}/cramfs.XXXXXX)
+trap "$tmp; rm -rf $tmp $cramfs" ERR INT
+pushd $tmp
+gzip -d -c $isofs/bootcd.img  | cpio -diu
+gzip -d -c $isofs/overlay.img | cpio -diu
+
+# clean out unnecessary rpm lib
+echo "* clearing var/lib/rpm/*"
+rm -f var/lib/rpm/*
+
+# bootcd requires this directory
+mkdir -p mnt/confdevice
+
+# relocate various directory to /tmp
+rm -rf root
+ln -fs /tmp/root root
+ln -fs /sbin/init linuxrc 
+ln -fs /tmp/resolv.conf etc/resolv.conf
+ln -fs /tmp/etc/mtab etc/mtab
+
+# have pl_rsysinit copy over appropriate etc & var directories into /tmp/etc/
+# make /tmp/etc
+echo "* renaming dirs in ./etc"
+pushd etc
+for dir in `find * -type d -prune | grep -v rc.d`; do mv ${dir} ${dir}_o; ln -fs /tmp/etc/${dir} ${dir} ; done
+popd
+
+echo "* renaming dirs in ./var"
+# rename all top-level directories and put in a symlink to /tmp/var
+pushd var
+for dir in `find * -type d -prune`; do mv ${dir} ${dir}_o; ln -fs /tmp/var/${dir} ${dir} ; done
+popd
+
+#overwrite fstab to mount / as cramfs and /tmp as tmpfs
+echo "* Overwriting etc/fstab to use cramfs and tmpfs"
+rm -f ./etc/fstab
+cat >./etc/fstab <<EOF
+/dev/ram0     /              cramfs     ro              0 0
+none          /dev/pts       devpts     gid=5,mode=620  0 0
+none          /proc          proc       defaults        0 0
+none          /sys           sysfs      defaults        0 0
+EOF
+
+pushd dev
+rm -f console
+mknod console c 5 1
+#for i in 0 1 2 3 4 5 6 7 8; do rm -f ram${i} ; done
+#for i in 0 1 2 3 4 5 6 7 8; do mknod ram${i} b 1 ${i} ; done
+#ln -fs ram1 ram
+#ln -fs ram0 ramdisk
+popd
+
+# update etc/inittab to start with pl_rsysinit
+sed -i 's,pl_sysinit,pl_rsysinit,' etc/inittab
+
+#calculate the size of /tmp based on the size of /etc & /var + 8MB slack
+etcsize=$(du -s ./etc | awk '{ print $1 }')
+varsize=$(du -s ./etc | awk '{ print $1 }')
+let msize=($vsize+$esize+8192)/1024
+
+# generate pl_rsysinit
+cat > etc/rc.d/init.d/pl_rsysinit <<EOF
+#!/bin/sh
+# generated by build.sh
+echo -n "pl_rsysinit: preparing /etc and /var for pl_sysinit..."
+mount -t tmpfs -orw,size=${msize}M,mode=1777 tmpfs /tmp
+mkdir -p /tmp/root
+mkdir -p /tmp/etc
+touch /tmp/etc/resolv.conf
+touch /tmp/etc/mtab
+mkdir -p /tmp/var
+
+# make mtab happy
+echo "tmpfs /tmp tmpfs rw,size=${msize}M,mode=1777 1 1" > /tmp/etc/mtab
+
+# copy over directory contents of all _o directories from /etc and /var
+# /tmp/etc and /tmp/var
+pushd /etc
+for odir in \$(cd /etc && ls -d *_o); do dir=\$(echo \$odir | sed 's,\_o$,,'); (mkdir -p /tmp/etc/\$dir && cd \$odir && find . | cpio -p -d -u /tmp/etc/\$dir); done
+popd
+pushd /var
+for odir in \$(cd /var && ls -d *_o); do dir=\$(echo \$odir | sed 's,\_o$,,'); (mkdir -p /tmp/var/\$dir && cd \$odir && find . | cpio -p -d -u /tmp/var/\$dir); done
+popd
+
+echo "done"
+# hand over to pl_sysinit
+echo "pl_rsysinit: handing over to pl_sysinit"
+/etc/init.d/pl_sysinit
+EOF
+chmod +x etc/rc.d/init.d/pl_rsysinit
+
+popd
+
+chown -R 0.0 $cramfs
+
+#create the cramfs image
+echo "* Creating cramfs image"
+mkfs.cramfs $tmp/ $cramfs
+# Leave 1 MB of free space on the VFAT filesystem
+cramfs_size=$(($(du -sk $cramfs | awk '{ print $1; }')))
+mv $cramfs ${BUILDTMP}/cramfs.img
+rm -rf $tmp
+trap - ERR INT
+
+# Create ISO CRAMFS image
+echo "* Creating ISO CRAMFS-based image"
+iso="$PLC_NAME-BootCD-$BOOTCD_VERSION-cramfs.iso"
+
+tmp=$(mktemp -d ${BUILDTMP}/bootcd.XXXXXX)
+trap "$tmp; rm -rf $tmp" ERR INT
+(cd $isofs && find . | grep -v "\.img$" | cpio -p -d -u $tmp/)
+cat >$tmp/isolinux.cfg <<EOF
+DEFAULT kernel
+APPEND ramdisk_size=$cramfs_size initrd=cramfs.img root=/dev/ram0 ro
+DISPLAY pl_version
+PROMPT 0
+TIMEOUT 40
+EOF
+
+cp ${BUILDTMP}/cramfs.img $tmp
+mkisofs -o "$iso" \
+    -R -allow-leading-dots -J -r \
+    -b isolinux.bin -c boot.cat \
+    -no-emul-boot -boot-load-size 4 -boot-info-table \
+    $tmp
+
+# Create ISO CRAMFS image with serial line support
+echo "* Creating ISO image with cramfs and serial line support"
+cat >$tmp/isolinux.cfg <<EOF
+SERIAL 0 115200
+PROMPT 0
+TIMEOUT 120
+DISPLAY pl_version
+DEFAULT serial
+LABEL serial
+	KERNEL kernel
+	APPEND ramdisk_size=$cramfs_size initrd=cramfs.img root=/dev/ram0 ro  console=ttyS0,115200n8
+EOF
+
+iso="$PLC_NAME-BootCD-$BOOTCD_VERSION-cramfs-serial.iso"
+mkisofs -o "$iso" \
+    -R -allow-leading-dots -J -r \
+    -b isolinux.bin -c boot.cat \
+    -no-emul-boot -boot-load-size 4 -boot-info-table \
+    $tmp
+
+rm -rf $tmp
+trap - ERR INT
+
+# Create USB CRAMFS based image
+echo "* Creating USB CRAMFS based image"
+usb="$PLC_NAME-BootCD-$BOOTCD_VERSION-cramfs.usb"
+
+# leave 1MB of space on the USB VFAT
+let vfat_size=${cramfs_size}+2048
+
+# Make VFAT filesystem for USB
+mkfs.vfat -C "$usb" $vfat_size
+
+# Mount it
+tmp=$(mktemp -d ${BUILDTMP}/bootcd.XXXXXX)
+mount -o loop "$usb" $tmp
+trap "umount $tmp; rm -rf $tmp ${BUILDTMP}/cramfs.img" ERR INT
+
+# Populate it
+echo "* Populating USB with overlay images and cramfs"
+(cd $isofs && find . | grep -v "\.img$" | cpio -p -d -u $tmp/)
+cp ${BUILDTMP}/cramfs.img $tmp/
+
+# Use syslinux instead of isolinux to make the image bootable
+cat >$tmp/syslinux.cfg <<EOF
+TIMEOUT 120
+DISPLAY pl_version
+DEFAULT vga
+LABEL vga
+	KERNEL kernel
+	APPEND ramdisk_size=$cramfs_size initrd=cramfs.img root=/dev/ram0 ro
+EOF
+umount $tmp
+rmdir $tmp
+trap - ERR INT
+
+echo "* Making USB CRAMFS based image bootable"
+$srcdir/syslinux/unix/syslinux "$usb"
+
+# Create USB CRAMFS based image w/ serial line support
+echo "* Creating USB CRAMFS based image w/ serial line support"
+usb="$PLC_NAME-BootCD-$BOOTCD_VERSION-cramfs-serial.usb"
+
+# leave 4MB of space on the USB VFAT
+let vfat_size=${cramfs_size}+2048
+
+# Make VFAT filesystem for USB
+mkfs.vfat -C "$usb" $vfat_size
+
+# Mount it
+tmp=$(mktemp -d ${BUILDTMP}/bootcd.XXXXXX)
+mount -o loop "$usb" $tmp
+trap "umount $tmp; rm -rf $tmp ${BUILDTMP}/cramfs.img" ERR INT
+
+# Populate it
+echo "* Populating USB with overlay images and cramfs"
+(cd $isofs && find . | grep -v "\.img$" | cpio -p -d -u $tmp/)
+cp ${BUILDTMP}/cramfs.img $tmp/
+
+# Use syslinux instead of isolinux to make the image bootable
+cat >$tmp/syslinux.cfg <<EOF
+SERIAL 0 115200
+PROMPT 0
+TIMEOUT 120
+DISPLAY pl_version
+DEFAULT serial
+LABEL serial
+	KERNEL kernel
+	APPEND ramdisk_size=$cramfs_size initrd=cramfs.img root=/dev/ram0 ro  console=ttyS0,115200n8
+EOF
+umount $tmp
+rmdir $tmp
+trap - ERR INT
+
+echo "* Making USB CRAMFS based image /w serial line support bootable"
+$srcdir/syslinux/unix/syslinux "$usb"
+
+exit 0