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# larch3 - live 'hook' for mkinitcpio:
# deal with c2r,
# mount base system,
# load overlay,
# set up unioned root filesystem.
# Also manages overlay merging.
# Author: Michael Towers <gradgrind[at]online[dot]de>
#
# This file is part of the larch project.
#
# larch is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# larch is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with larch; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#
#----------------------------------------------------------------------------
# 2008.04.04
run_hook ()
{
if [ "x${LDEV}" = "x" ]; then
err "Sorry, couldn't find boot medium ..."
break="y"
return
fi
/sbin/modprobe loop
# Path to compressed base system
sysSqf=${cdmount}/system.sqf
ovlpath=${cdmount}
# A possibility to use alternative files:
if [ -f ${cdmount}/larch/boot-init ]; then
. ${cdmount}/larch/boot-init
fi
# Path to compressed 'modifications' archive
modsSqf=${ovlpath}/mods.sqf
# Default overlay file and directory
overlay=${ovlpath}/overlay.ovl
# Make union root
/bin/mkdir /union
# Deal with new archives
if [ -f ${overlay}_ ]; then
/bin/mount -o remount,rw ${LDEV} ${cdmount}
/bin/mv ${overlay} ${overlay}~
/bin/mv ${overlay}_ ${overlay}
if [ -f ${modsSqf}_ ]; then
/bin/mv ${modsSqf} ${modsSqf}~
/bin/mv ${modsSqf}_ ${modsSqf}
fi
/bin/mount -o remount,ro ${LDEV} ${cdmount}
fi
# Boot option copy-to-ram (c2r)
if [ "${c2r}" = "y" ]; then
msg_ ":: Copying base system to RAM, this will take a while ..."
/bin/cat ${sysSqf} > /tfs/system.sqf
if [ $? -ne 0 ]; then
err "Sorry, not enough RAM"
break="y"
return
fi
sysSqf=/tfs/system.sqf
msg_ ":: Copying mods archive to RAM, this might take a while ..."
/bin/cat ${modsSqf} > /tfs/mods.sqf
if [ $? -ne 0 ]; then
err "Sorry, not enough RAM"
break="y"
return
fi
modsSqf=/tfs/mods.sqf
# force use of swap (if available)
:> /tfs/swapon
elif [ "${swap}" = "y" ]; then
:> /tfs/swapon
fi
msg_ ":: Mounting squashed images"
/bin/mkdir /tfs/system
#added sleep for 3 seconds, because well i don't know but it seems to fix things
sleep 3
# The klibc mount command doesn't support '-o loop'
/bin/losetup /dev/loop0 ${sysSqf}
/bin/mount -r -t squashfs /dev/loop0 /tfs/system
# Make stuff in 'system' available by providing the loader and
# library path
ldli=$( cd /tfs/system; echo lib/ld-linux*.so.2 )
/bin/ln -s /tfs/system/${ldli} /${ldli}
export LD_LIBRARY_PATH=/tfs/system/lib:/tfs/system/usr/lib
/bin/mkdir /tfs/mods
# The klibc mount command doesn't support '-o loop'
/bin/losetup /dev/loop1 ${modsSqf}
/bin/mount -r -t squashfs /dev/loop1 /tfs/mods
# Unpack the overlay
msg_ ":: Initializing writable layer for union (overlay)"
/tfs/system/usr/bin/lzop -d < ${overlay} | \
/tfs/system/bin/tar -C /tfs -xf -
# Copy the installation tidy-up script (for removing custom live-only stuff),
# and any other files in 'larch/copy' directory
if [ -d ${ovlpath}/larch/copy ]; then
cd ${ovlpath}/larch/copy
for f in *; do
cat ${f} >/tfs/${f}
done
fi
msg_ ":: Setting up union file system"
layers="/tfs/overlay=rw:/tfs/mods=${ovlmnt}:/tfs/system=${sqfmnt}"
/bin/mount -t ${utype} -o ${bropt}${layers} ${utype} /union
echo "${utype}" > /tfs/utype
# Minimal device nodes needed before udev does its work
/bin/mkdir /union/dev
/bin/mknod /union/dev/console c 5 1
/bin/mknod /union/dev/null c 1 3
/bin/mknod /union/dev/zero c 1 5
# Make special directories
/bin/mkdir -m 1777 /union/tmp
/bin/mkdir /union/media
/bin/mkdir /union/sys
/bin/mkdir /union/proc
# Make the tmpfs stuff accessible within the union
/bin/mkdir /union/.livesys
/bin/mount -o bind /tfs /union/.livesys
/bin/mkdir /union/.livesys/medium
/bin/mount -o bind /tfs/system /union/.livesys/system
/bin/mount -o bind /tfs/overlay /union/.livesys/overlay
/bin/mount -o bind ${cdmount} /union/.livesys/medium
if [ "x${modsSqf}" != "x" ]; then
/bin/mount -o move /tfs/mods /union/.livesys/mods
fi
# Remember the boot device
echo "${LDEV}" > /tfs/bootdevice
if [ "${c2r}" = "y" ]; then
# Set flag to inform system of copy-to-ram
:> /tfs/c2r
# Unmount boot device
/bin/umount ${cdmount}
fi
msg_ ":: End of live system set-up"
# Now some tweaks to alter 'init' actions from non-larch hooks, etc.
# Override rootdelay from usb hook
if [ "x${larchdelay}" = "x" ]; then
# To avoid spurious udevd pid numbers
export rootdelay=1
else
# Allow adjustment via boot option
export rootdelay=${larchdelay}
fi
# root must be set to something or other, even though larch doesn't
# need it ...
export root="/dev/loop0"
}
#######
# The actual root switch occurs later, when 'init' execs 'kinit'.
# I handle this by overwriting the 'kinit' binary with my own script.
# This will unmount dev, sys and proc and then exec run-init.
#######
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