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#!/bin/sh
## live-build(7) - System Build Scripts
## Copyright (C) 2016-2020 The Debian Live team
## Copyright (C) 2006-2015 Daniel Baumann <mail@daniel-baumann.ch>
##
## This program comes with ABSOLUTELY NO WARRANTY; for details see COPYING.
## This is free software, and you are welcome to redistribute it
## under certain conditions; see COPYING for details.
Lodetach ()
{
local DEVICE="${1}"
local ATTEMPT="${2:-1}"
if [ "${ATTEMPT}" -gt 3 ]
then
Echo_error "Failed to detach loop device '${DEVICE}'."
exit 1
fi
# Changes to block devices result in uevents which trigger rules which in
# turn access the loop device (ex. udisks-part-id, blkid) which can cause
# a race condition. We call 'udevadm settle' to help avoid this.
if command -v udevadm >/dev/null
then
udevadm settle
fi
# Loop back devices aren't the most reliable when it comes to writes.
# We sleep and sync for good measure - better than build failure.
sync
sleep 1
losetup -d "${DEVICE}" || Lodetach "${DEVICE}" "$(expr ${ATTEMPT} + 1)"
}
Losetup ()
{
local DEVICE="${1}"
local FILE="${2}"
local PARTITION="${3:-1}"
local FDISK_OUT
local LOOPDEVICE
losetup --read-only --partscan "${DEVICE}" "${FILE}"
FDISK_OUT="$(fdisk -l -u ${DEVICE} 2>&1)"
Lodetach "${DEVICE}"
LOOPDEVICE="$(echo ${DEVICE}p${PARTITION})"
if [ "${PARTITION}" = "0" ]
then
Echo_message "Mounting %s with offset 0" "${DEVICE}"
losetup --partscan "${DEVICE}" "${FILE}"
else
local SECTORS
local OFFSET
SECTORS="$(echo "$FDISK_OUT" | sed -ne "s|^$LOOPDEVICE[ *]*\([0-9]*\).*|\1|p")"
OFFSET="$(expr ${SECTORS} '*' 512)"
Echo_message "Mounting %s with offset %s" "${DEVICE}" "${OFFSET}"
losetup --partscan -o "${OFFSET}" "${DEVICE}" "${FILE}"
fi
}
# adapted from lib/ext2fs/mkjournal.c, default block size is 4096 bytes (/etc/mke2fs.conf).
ext2fs_default_journal_size()
{
local SIZE="$1"
if [ "${SIZE}" -lt "8" ]; then # 2048*4096
echo 0
elif [ "${SIZE}" -lt "128" ]; then # 32768*4096
echo 4
elif [ "${SIZE}" -lt "1024" ]; then # 256*1024*4096
echo 16
elif [ "${SIZE}" -lt "2048" ]; then # 512*1024*4096
echo 32
elif [ "${SIZE}" -lt "4096" ]; then # 1024*1024*4096
echo 64
else
echo 128
fi
}
Calculate_partition_size_without_journal ()
{
local WITHOUT_JOURNAL_ORIGINAL_SIZE="${1}"
local WITHOUT_JOURNAL_FILESYSTEM="${2}"
local PERCENT
case "${WITHOUT_JOURNAL_FILESYSTEM}" in
ext2|ext3|ext4)
PERCENT="6"
;;
*)
PERCENT="3"
;;
esac
echo $(expr ${WITHOUT_JOURNAL_ORIGINAL_SIZE} + ${WITHOUT_JOURNAL_ORIGINAL_SIZE} \* ${PERCENT} / 100 + 1)
}
Calculate_partition_size ()
{
local ORIGINAL_SIZE="${1}"
local FILESYSTEM="${2}"
case "${FILESYSTEM}" in
ext3|ext4)
local NON_JOURNAL_SIZE
local PROJECTED_JOURNAL_SIZE
local PROJECTED_PARTITION_SIZE
local PRE_FINAL_PARTITION_SIZE
local JOURNAL_SIZE
NON_JOURNAL_SIZE=$(Calculate_partition_size_without_journal ${ORIGINAL_SIZE} ${FILESYSTEM})
PROJECTED_JOURNAL_SIZE=$(ext2fs_default_journal_size ${NON_JOURNAL_SIZE})
PROJECTED_PARTITION_SIZE=$(expr ${ORIGINAL_SIZE} + ${PROJECTED_JOURNAL_SIZE})
PRE_FINAL_PARTITION_SIZE=$(Calculate_partition_size_without_journal ${PROJECTED_PARTITION_SIZE} ${FILESYSTEM})
JOURNAL_SIZE=$(ext2fs_default_journal_size ${PRE_FINAL_PARTITION_SIZE})
expr $(Calculate_partition_size_without_journal ${ORIGINAL_SIZE} ${FILESYSTEM}) + ${JOURNAL_SIZE}
;;
*)
Calculate_partition_size_without_journal ${ORIGINAL_SIZE} ${FILESYSTEM}
;;
esac
}
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