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# Copyright (C) 2009 One Laptop per Child
# Licensed under the terms of the GNU GPL v2 or later; see COPYING for details.
. $OOB__shlib
versioned_fs=$(read_config base versioned_fs)
buildnr=$(read_buildnr)
BLOCK_SIZE=512
ROOT_PARTITION_START_BLOCK=139264
NUM_HEADS=16
NUM_SECTORS_PER_TRACK=62
# FIXME trap signals and cleanup
# FIXME check that traps due to errors are caught
BOOT=$intermediatesdir/mnt-boot
ROOT=$intermediatesdir/mnt-root
umount $BOOT &>/dev/null || :
umount $ROOT &>/dev/null || :
mkdir -p $BOOT
mkdir -p $ROOT
# Automatically determine a size for the output disk image (including root
# and boot partitions).
#
# This is calculated by examining how much space was used in the intermediate
# filesystem image, and by adding a small amount of free space for safety.
auto_size()
{
local rawfs=$intermediatesdir/rawfs.img
local edump=$(dumpe2fs "$rawfs")
local bsize=$(echo "$edump" | grep "^Block size:")
local bcount=$(echo "$edump" | grep "^Block count:")
local freeblocks=$(echo "$edump" | grep "^Free blocks:")
# Remove textual labels, we just want the numbers
bsize="${bsize##* }"
bcount="${bcount##* }"
freeblocks="${freeblocks##* }"
local usedblocks=$(( bcount - freeblocks ))
local usedsize=$(( usedblocks * bsize ))
# In my testing, the new image has about 100mb free even when we try
# to match the size exactly. So we use the exact size; if we find that
# we need to add some 'safety' space later, we can add it.
#local newsize=$(( usedsize + (20*1024*1024) ))
local newsize=$usedsize
# Increase by size of boot partition
(( newsize += $ROOT_PARTITION_START_BLOCK * $BLOCK_SIZE ))
echo $newsize
}
make_image()
{
local disk_size=$1
local ext=$2
[ -z "$ext" ] && ext="zd"
if [ "$disk_size" = "auto" ]; then
disk_size=$(auto_size)
fi
echo "Making image of size $disk_size"
echo "Create disk and partitions..."
local num_blocks=$(($disk_size / $BLOCK_SIZE))
local num_cylinders=$(($num_blocks / $NUM_HEADS / $NUM_SECTORS_PER_TRACK))
local image_size=$(($num_cylinders * $NUM_HEADS * $NUM_SECTORS_PER_TRACK * $BLOCK_SIZE))
local img=$intermediatesdir/$(image_name).$ext.disk.img
dd if=/dev/zero of=$img bs=$BLOCK_SIZE count=0 seek=$(($image_size / $BLOCK_SIZE))
/sbin/sfdisk -S 32 -H 32 --force -uS $img <<EOF
8192,131072,83,*
$ROOT_PARTITION_START_BLOCK,,,
EOF
disk_loop=$(losetup --show --find --partscan $img)
boot_loop="${disk_loop}p1"
root_loop="${disk_loop}p2"
# Work around occasional failure for loop partitions to appear
# http://marc.info/?l=linux-kernel&m=134271282127702&w=2
local i=0
while ! [ -e "$boot_loop" ]; do
partx -a -v $disk_loop
sleep 1
(( ++i ))
[ $i -ge 10 ] && break
done
echo "Create filesystems..."
mke2fs -O dir_index,^resize_inode -L Boot -F $boot_loop
mount $boot_loop $BOOT
mkfs.ext4 -O dir_index,^huge_file -E resize=8G -m1 -L OLPCRoot $root_loop
tune2fs -o journal_data_ordered $root_loop
mount $root_loop $ROOT
echo "Copy in root filesystem..."
cp -a $fsmount/* $ROOT
echo "Setup boot partition..."
# runin testing needs this directory (#9840)
# this needs to be done during build so that OFW can put files here
# (e.g. updated tests) before the OS has ever booted
mkdir -p $BOOT/runin
# we put /security here as it's used by OFW, and should persist between
# updates
mkdir -p $BOOT/security
# this is where Fedora's statetab tmpfs mount system puts its data.
# the directory has to be created in advance
mkdir -p $BOOT/security/state
if [ "$versioned_fs" = "1" ]; then
local tgt=$BOOT/boot-versions/$buildnr
mkdir -p $tgt
ln -s boot-versions/$buildnr $BOOT/boot
ln -s boot/alt $BOOT/boot-alt
cp -ar $ROOT/versions/pristine/$buildnr/boot/* $tgt
else
cp -ar $ROOT/boot/* $BOOT
ln -s . $BOOT/boot
fi
umount $ROOT
umount $BOOT
losetup -d $disk_loop || :
# FIXME: any value to running e2fsck now? maybe with -D ?
}
find_option_values sizes sd_card_image size
for val in "${sizes[@]}"; do
disk_size=${val%,*}
ext=
expr index "$vals" ',' &>/dev/null && ext=${vals#*,}
make_image $disk_size $ext
done
# If no sizes were specified, create an image with automatic size.
[[ ${#sizes[@]} == 0 ]] && make_image auto
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