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2006-05-11
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#!/bin/ash
# Functions library :: for Linux Live scripts 5.x.y
# Author: Tomas M. <http://www.linux-live.org>
#
# ===========================================================
# variables
# ===========================================================
# linux live flag to fstab, if fstab line doesn't contain it,
# never remove it from fstab automatically (user added it)
FSTABLLFLAG="# Auto-Update"
# ===========================================================
# user interface functions
# ===========================================================
# echolog
# $1 = text to show and to write to /var/log/messages
#
echolog()
{
echo "LIVECD:" "$@" >>/var/log/livedbg
echo "$@"
}
# debug
# commands executed when debug boot parameter is present
#
debug()
{
echo
echo "====="
echo ": Debugging started. Here is the root shell for you."
echo ": Type your desired command or hit Ctrl+D to continue booting."
echo
ash
}
# header
# $1 = text to show
#
header()
{
echolog "
$1
"
}
fatal()
{
echolog
header "Fatal error occured - $1"
echolog "Something went wrong and we can't continue. This should never happen."
echolog "Please reboot your computer with Ctrl+Alt+Delete ..."
echolog
ash
}
allow_only_root()
{
# test if the script is started by root user. If not, exit
if [ "0$UID" -ne 0 ]; then
echo "Only root can run `basename $0`"; exit 1
fi
}
# ===========================================================
# text processing functions
# ===========================================================
# egrep_o is a replacement for "egrep -o". It prints only the last
# matching text
# $1 = regular expression
#
egrep_o()
{
cat | egrep "$1" | sed -r "s/.*($1).*/\\1/"
}
# look into cmdline and echo $1 back if $1 is set
# $1 = value name, case sensitive, for example livecd_subdir
# $2 = file to use instead /proc/cmdline, optional
#
cmdline_parameter()
{
CMDLINE=/proc/cmdline
if [ "$2" != "" ]; then CMDLINE="$2"; fi
cat "$CMDLINE" | egrep_o "(^|[[:space:]]+)$1(\$|=|[[:space:]]+)" | egrep_o "$1"
}
# look into cmdline and echo value of $1 option
# $1 = value name, case sensitive, for example livecd_subdir
# $2 = file to use instead /proc/cmdline, optional
#
cmdline_value()
{
CMDLINE=/proc/cmdline
if [ "$2" != "" ]; then CMDLINE="$2"; fi
cat "$CMDLINE" | egrep_o "(^|[[:space:]]+)$1=([^[:space:]]+)" | egrep_o "=.*" | cut -b 2- | tail -n 1
}
# ===========================================================
# system functions
# ===========================================================
# modprobe module $1, including all dependencies, suppress all messages
# (own function because modprobe in busybox doesn't work with gzipped modules)
# $1 = module name, eg. ehci-hcd
# $2 = optional argument
#
modprobe_module()
{
if [ "$1" = "" ]; then return 1; fi
PRINTK=`cat /proc/sys/kernel/printk`
echo "0" >/proc/sys/kernel/printk
KERNEL="`uname -r`"; LSMOD=/tmp/_lsmod
MODULEDEPS="`cat /lib/modules/$KERNEL/modules.dep | egrep \"$1\\.ko(\\.gz)?:\"`"
for MODULE in `echo $MODULEDEPS | cut -d ":" -f 2-` `echo $MODULEDEPS | cut -d ":" -f 1`; do
TMPMOD="/tmp/`basename $MODULE .gz`";
# if the module is not loaded already
if [ "`cat $LSMOD 2>/dev/null | egrep \"^$TMPMOD\\\$\"`" = "" ]; then
gunzip -c $MODULE 2>/dev/null >$TMPMOD
if [ "$?" -ne 0 ]; then cp $MODULE $TMPMOD; fi # can't gunzip? copy
insmod $TMPMOD $2 >/dev/null 2>/dev/null; err=$?
if [ "$err" -eq 0 ]; then echo $TMPMOD >>$LSMOD; fi # module log
rm $TMPMOD
fi
done
echo "$PRINTK" >/proc/sys/kernel/printk
if [ "$err" -ne 0 ]; then echolog "error inserting module $1 ($err) for your kernel `uname -r`"; fi
return $err
}
# Mount device $1 to $2
# $1 = /dev device to mount, eg. /dev/hda1
# $2 = mountpoint, eg. /mnt/hda1
# $3 = mount options, for example "loop", "ro", or "remount,rw"
# $4 = filesystem type
#
mount_device()
{
mkdir -p $2
if [ "$3" != "" ]; then OPTIONS="-o $3"; else OPTIONS=""; fi
if [ "$4" != "" ]; then FILESYSTEM="-t $4"; else FILESYSTEM=""; fi
PRINTK=`cat /proc/sys/kernel/printk`
echo "0" >/proc/sys/kernel/printk
mount $FILESYSTEM $1 $2 $OPTIONS >/dev/null 2>/dev/null
err=$?
if [ "$err" -ne 0 ]; then rmdir $2 2>/dev/null; fi
echo "$PRINTK" >/proc/sys/kernel/printk
return $err
}
# ===========================================================
# live module functions
# ===========================================================
# Create module
# call mksquashfs with apropriate arguments
# $1 = directory which will be compressed to squashfs module
# $2 = output .mo file
# $3 = optional -keep-as-directory argument
#
create_module()
{
mksquashfs "$1" "$2" $3 >/dev/null
if [ $? -ne 0 ]; then return 1; fi
chmod oga-x "$2" # remove execute attrib
}
# Mount .mo module to destination directory
# $1 = path to .mo livecd compressed module
# $2 = destination folder
#
mount_module()
{
mount -t squashfs -o loop,ro "$1" "$2"
err=$?
if [ $err -eq 0 ]; then
echo "$1 $2" >>/tmp/_mounts
fi
return $err
}
# Insert a directory tree $2 to an union specified by $1
# Top-level read-write branch is specified by it's index 0
# $1 = union absolute path (starting with /)
# $2 = path to data directory
#
union_insert_dir()
{
unionctl "$1" --add --after 0 --mode ro "$2"
}
# List all modules in all directories (base, modules, optional)
# and filter out unneeded optional modules (not specified by load= kernel parameter)
# $1 = root directory of mounted DATAdir
#
list_modules()
{
LOAD="`cmdline_value load`"
ls -A1d $1/base/*.mo $1/modules/*.mo $1/optional/*.mo 2>/dev/null | while read LINE; do
MODNAME="`basename $LINE .mo`"
if [ "$LOAD" != "*" -a "`echo $LINE | grep optional`" != "" -a "`echo $LOAD | egrep \"(^|,)$MODNAME(\\\$|,)\"`" = "" ]; then continue
else echo $LINE; fi
done
}
# Insert one single .mo module to the union
# $1 = union absolute path
# $2 = module.mo full path
# $3 = destination folder, where images will be mounted to
#
union_insert_module()
{
TARGET="$3/`basename $2`"
if mountpoint $TARGET >/dev/null 2>&1; then continue; fi # skip mounted modules
mkdir -p $TARGET
mount_module $2 $TARGET
if [ $? -ne 0 ]; then echo "Cannot read module data. corrupted download?" >&2; return 1; fi
union_insert_dir $1 $TARGET
if [ $? -ne 0 ]; then echo "can't insert module to union" >&2; return 2; fi
basename $TARGET
}
# Insert all .mo modules, in $2 directory and subdirectories, to the union
# $1 = union absolute path (starting with /)
# $2 = LiveCD data dir (with directories /base, /modules, etc.)
# $3 = destination folder, where images will be mounted to
#
union_insert_modules()
{
list_modules $2 | while read MODULE; do
echo -n " -> "
union_insert_module $1 $MODULE $3
done
}
# Copy LiveCD modules to RAM directory
# will copy only /boot, and module files from $1
# $1 = data directory
# $2 = target directory in RAM
#
copy_to_ram()
{
cp -R "$1/boot" "$2" # kernel is not required but it's nice2have
list_modules "$1" | while read MODULE; do
TARGET="$2/`basename \`dirname $MODULE\``"
mkdir -p "$TARGET"
cp "$MODULE" "$TARGET"
if [ "$?" -ne 0 ]; then fatal "can't copy to RAM, not enough memory?"; fi
done
}
# Copy content of "rootcopy" directory on the CD to $2 (union, usually)
# $1 = source
# $2 = destination
#
copy_rootchanges()
{
cp -a $1/rootcopy/* $2 2>/dev/null # could be empty
}
# ===========================================================
# discovery functions
# ===========================================================
# List all CD-ROMs
# by using /proc entries
#
list_cdrom_devices()
{
if [ "`cmdline_parameter nocd`" != "" ]; then return 1; fi
for CDDEVICE in `cat /proc/sys/dev/cdrom/info 2>/dev/null | head -n 3 | tail -n 1 | cut -d ":" -f 2`; do
echo "/dev/$CDDEVICE"
done
}
# List all devices with filesystems
# Return empty result when nohd parameter was given.
#
list_partition_devices()
{
if [ "`cmdline_parameter nohd`" != "" ]; then return 1; fi
cat /proc/partitions | grep -v loop | sed -r "s/^[0-9 ]+/\\/dev\\//" | grep /dev/
# blkid | grep -v swap | cut -d : -f 1 | grep -v loop
}
# List all disk devices
#
list_disk_devices()
{
list_partition_devices | egrep -v "[0-9]"
}
# List all partitions marked as Linux Swap
#
list_swap_devices()
{
if [ "`cmdline_parameter nohd`" != "" ]; then return 1; fi
blkid -t TYPE="swap" | cut -d : -f 1
}
# List all block devices
#
list_block_devices()
{
list_cdrom_devices
list_partition_devices
}
# Try to mount all disks, partitions and cdroms and Find where the LiveCD is.
# If LiveCD found in the device, echo dirname of it's directory,
# and leave the device mounted. Mounting is not ro, but without any argument.
# $1 = directory where devices will be mounted
#
find_live_data_dir()
{
list_block_devices | while read DEVICE; do
DIR="/$1/`basename $DEVICE`"
mount_device $DEVICE $DIR
if [ $? -ne 0 ]; then continue; fi
FOUND=`ls -A1d $DIR/livecd.sgn $DIR/*/livecd.sgn 2>/dev/null | head -n 1`
if [ "$FOUND" = "" ]; then umount $DIR 2>/dev/null; rmdir $DIR 2>/dev/null
else dirname "$FOUND"; return 1; fi
done
}
# ===========================================================
# hardware preparation functions
# ===========================================================
# Create block devices to /dev described by /sys entries
#
create_block_devices()
{
echolog "creating /dev entries for block devices"
ls -A1d /sys/block/*/dev /sys/block/*/*/dev 2>/dev/null | grep -v loop | while read BLOCK; do
DEVICE="/dev/`basename \`dirname $BLOCK\``"
if [ ! -b $DEVICE ]; then
MINORMAJOR="`head -n 1 $BLOCK | tr ':' ' '`"
mknod $DEVICE b $MINORMAJOR
fi
done
}
# modprobe kernel modules needed for the LiveCD
#
modprobe_essential_modules()
{
echolog "starting loop device support"
modprobe_module loop max_loop=255
echolog "starting cdrom filesystem support"
modprobe_module isofs
echolog "starting squashfs support"
modprobe_module squashfs
echolog "starting unionfs support"
modprobe_module unionfs
echolog "starting vfat support"
modprobe_module nls_cp437
modprobe_module nls_iso8859-1
modprobe_module nls_iso8859-2
modprobe_module vfat
echolog "starting ntfs support"
modprobe_module ntfs
create_block_devices
}
# modprobe kernel modules needed for USB masstorage devices
#
modprobe_usb_modules()
{
echolog "starting USB support"
modprobe_module ehci-hcd
modprobe_module ohci-hcd
modprobe_module uhci-hcd
modprobe_module usb-storage
sleep 5
create_block_devices
}
# enable/disable CD autoejecting when unmounted
# $1 = 1|0 ... enable|disable
#
cd_autoeject()
{
echo $1 >/proc/sys/dev/cdrom/autoeject
}
# Disable DMA if nodma boot parameter is present
#
setup_dma()
{
if [ ! "`cmdline_parameter nodma`" = "" ]; then
for DEVICE in `list_cdrom_devices` `list_disk_devices`; do
echolog "setting DMA support off for $DEVICE"
hdparm -d 0 $DEVICE
done
fi
}
# update given line in fstab, add new values only if the device is not found
# $1 = fstab file to parse
# $2 = device name
# $3 = mountpoint
# $4 = filesystem
# $5 = mount options
#
fstab_update_line()
{
if [ "`cat \"$1\" | egrep \"^[[:space:]]*[^[:space:]]+[[:space:]]+$3\"`" = "" ]; then
echo "$2" "$3" "$4" "$5" 0 0 "$FSTABLLFLAG" >>$1
fi
}
# create correct fstab file in $1/etc/fstab and create apropriate
# mount directories in $1/mnt. Check for iocharset boot option,
# if present, add iocharset to all DOS/Win filesystems (vfat,ntfs)
# $1 = root directory (union)
#
fstab_update()
{
IOCHARSET="`cmdline_value iocharset`"
FSTAB="$1/etc/fstab"
mkdir -p $1/etc $1/mnt
cat $FSTAB 2>/dev/null | grep -v "$FSTABLLFLAG" >$FSTAB~
fstab_update_line $FSTAB~ tmpfs / tmpfs defaults
fstab_update_line $FSTAB~ devpts /dev/pts devpts gid=5,mode=620
fstab_update_line $FSTAB~ proc /proc proc defaults
list_cdrom_devices | while read DEVICE; do
MOUNTDIR="/mnt/`basename $DEVICE`_cdrom"
mkdir -p $1/$MOUNTDIR
fstab_update_line $FSTAB~ $DEVICE $MOUNTDIR iso9660 noauto,users,exec
done
list_partition_devices | while read DEVICE; do
unset REMOVABLE; unset OPT; DEV="`basename $DEVICE`"; DEV0="`echo $DEV | cut -b 1-3`"
if [ "0`cat /sys/block/$DEV0/removable 2>/dev/null`" -ne 0 ]; then
REMOVABLE="_removable"
fi
MOUNTDIR="/mnt/$DEV$REMOVABLE"
FS="`blkid -s TYPE $DEVICE | cut -d = -f 2 | tr -d ' \"'`"
if [ "$FS" = "ntfs" -a "$IOCHARSET" != "" ]; then OPT=",nls=$IOCHARSET"; fi
if [ "$FS" = "vfat" -a "$IOCHARSET" != "" ]; then OPT=",iocharset=$IOCHARSET"; fi
if [ "$FS" != "" ]; then
fstab_update_line $FSTAB~ $DEVICE $MOUNTDIR $FS auto,users,suid,dev,exec$OPT
mkdir -p "$1/$MOUNTDIR"
fi
done
list_swap_devices | while read DEVICE; do
fstab_update_line $FSTAB~ $DEVICE swap swap defaults
done
fstab_update_line $FSTAB~ /dev/fd0 /mnt/floppy vfat,msdos noauto,users,suid,dev,exec
mkdir -p $1/mnt/floppy
mv -f $FSTAB~ $FSTAB
}