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1 beyerle@PS 1
#!/bin/ash
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#
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# Original version from http://www.linux-live.org/
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#
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# modified by Urs Beyerle, PSI
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# - to allow LiveCD mounted over NFS
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# - add support for LiveCD on SATA devices
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export PATH=.:/:/usr/sbin:/usr/bin:/sbin:/bin
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. liblinuxlive
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echolog "mounting /proc and /sys filesystems"
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mount -t proc proc /proc
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mount -t sysfs sysfs /sys
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ln -sf /proc/mounts /etc/mtab # this allows us to use umount -a
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# setup DEBUGCMD variable. If debug boot option is present, call debug()
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# function several times during script's execution
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if [ "`cmdline_parameter debug`" ]; then DEBUGCMD="debug"; else DEBUGCMD=""; fi
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$DEBUGCMD
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36 beyerle@PS 24
# amount of RAM to store changes
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RAMSIZE="`cmdline_value ramsize`"
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if [ "$RAMSIZE" = "" ]; then RAMSIZE="70%"; fi
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1 beyerle@PS 28
# I have to set these variables very carefully
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UNION=/union
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MEMORY=/memory
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#MOUNTDIR=mnt
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MOUNTDIR=livecd
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CHANGES=$MEMORY/changes
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COPY2RAM=$MEMORY/copy2ram
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IMAGES=$MEMORY/images
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INITRAMDISK=$MOUNTDIR/live
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# set NFSROOT if nfsroot= in boot parameter 
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NFSROOT="`cmdline_value nfsroot`"
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# we need cdrom support, isofs support, unionfs/aufs support, etc
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modprobe_essential_modules
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setup_dma
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$DEBUGCMD
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# if NFSROOT is set:
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echolog "check for nfsroot"
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if [ "$NFSROOT" != "" ]; then
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   # load network modules, if NFSROOT is set
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   echolog "nfsroot: $NFSROOT"
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   load_network_modules
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   $DEBUGCMD
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   # get DHCP lease
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   echolog "get DHCP lease"
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   get_dhcp_lease
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   $DEBUGCMD
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    # we need nfs modules loaded, if NFSROOT is set
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    modprobe_nfs_modules
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fi
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$DEBUGCMD
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# $UNION will be used as a root directory, livecd modules will be added soon.
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echolog "setup union on $UNION"
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mkdir -p $UNION
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mkdir -p $MEMORY
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CHANGESDEV="`cmdline_value changes`"
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if [ "$CHANGESDEV" != "" ]; then
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   echo "mounting $CHANGESDEV to $MEMORY"
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   mount_device $CHANGESDEV $MEMORY
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else false; fi
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# mount tmpfs only in the case when changes= boot parameter was empty
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# or we were not able to mount the storage device
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if [ $? -ne 0 ]; then mount -t tmpfs -o "size=$RAMSIZE" tmpfs $MEMORY; fi
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mkdir -p $CHANGES
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mkdir -p $COPY2RAM
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mkdir -p $IMAGES
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# mount unionfs or aufs
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lsmod | grep -q ^unionfs
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if [ $? -eq 0 ]; then  
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    mount -t unionfs -o dirs=$CHANGES=rw unionfs $UNION
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    if [ $? -ne 0 ]; then fatal "can't setup union in /union directory"; fi
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else
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    mount -t aufs -o br:$CHANGES=rw aufs $UNION
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    if [ $? -ne 0 ]; then fatal "can't setup union (aufs)"; fi
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fi
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1 beyerle@PS 99
$DEBUGCMD
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# try to find livecd data directory. If not found, try modprobing
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# USB and SATA kernel modules and repeat the find procedure again
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echolog "looking for data modules"
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DATA="`find_live_data_dir $MOUNTDIR`";
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# if [ "$DATA" = "" ]; then modprobe_usb_modules; DATA="`find_live_data_dir $MOUNTDIR`"; fi
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if [ "$DATA" = "" ]; then modprobe_usb_sata_modules; DATA="`find_live_data_dir $MOUNTDIR`"; fi
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if [ "$DATA" = "" ]; then fatal "Data for LiveCD not found. Are you using SCSI?"; fi
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echolog "LiveCD found in: $DATA"
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$DEBUGCMD
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# If toram or copy2ram boot parameter is present, copy all .mo modules to RAM.
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# (skip modules from /optional/ which are not listed in load= boot option)
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# Finaly modify DATA variable so it will point to correct directory
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if [ "`cmdline_parameter toram`" != "" -o "`cmdline_parameter copy2ram`" != "" ]; then
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   echolog "copying modules to RAM, this may take some time"
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   copy_to_ram $DATA $COPY2RAM
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   cd_autoeject 1
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   umount $DATA 2>/dev/null
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   if [ $? -ne 0 ]; then umount `dirname $DATA` 2>/dev/null; fi
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   DATA=$COPY2RAM
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   cd_autoeject 0
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fi
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mkdir -p $UNION/boot
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mount -o bind $DATA $UNION/boot
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$DEBUGCMD
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# DATA contains path to the base directory of all .mo images which need
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# to be mounted and inserted into live filesystem. Do it now.
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echolog "inserting all modules and creating live filesystem"
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union_insert_modules $UNION $DATA $IMAGES
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$DEBUGCMD
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echo "copying rootchanges"
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copy_rootchanges $DATA $UNION
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$DEBUGCMD
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echo "creating /etc/fstab"
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activate_fstab $UNION
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# More likely these directories aren't there.
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# Even if they are, this won't hurt.
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mkdir -p $UNION/proc
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mkdir -p $UNION/sys
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mkdir -p $UNION/tmp
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chmod 1777 $UNION/tmp
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mkdir -p $UNION/dev
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mkdir -p $UNION/initrd
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$DEBUGCMD
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# Union contains all the files and directories unioned from all modules.
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# Change root directory to it, and move initrd's root to /livecd/live/initramdisk
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# Finaly execute /sbin/init to start the distribution.
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echolog "changing root directory..."
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cd $UNION
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mkdir -p $INITRAMDISK
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umount /sys # we won't need it anymore
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if [ ! -e $UNION/dev/console ]; then mknod $UNION/dev/console c 5 1; fi
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if [ -x $UNION/usr/sbin/chroot ];
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  then CHROOT=/usr/sbin/chroot
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  else CHROOT=/usr/bin/chroot
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fi
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echolog "End of linux live scripts"
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# pure magic ;-)
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cat $UNION/bin/true >/dev/null
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$DEBUGCMD
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pivot_root . $INITRAMDISK
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exec $CHROOT . sbin/init <dev/console >dev/console 2>&1
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header "ERROR!"
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echolog "You are not supposed to be here, something went wrong!"
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echolog "Even Ctrl+Alt+Del won't help you in kernel panic."
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