/usr/share/live/build/functions/losetup.sh is in open-infrastructure-system-build 20161101-lts2-2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 | #!/bin/sh
## live-build(7) - System Build Scripts
## 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 ()
{
DEVICE="${1}"
ATTEMPT="${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 [ -x "$(which udevadm 2>/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
${LB_LOSETUP} -d "${DEVICE}" || Lodetach "${DEVICE}" "$(expr ${ATTEMPT} + 1)"
}
Losetup ()
{
DEVICE="${1}"
FILE="${2}"
PARTITION="${3:-1}"
${LB_LOSETUP} --read-only "${DEVICE}" "${FILE}"
FDISK_OUT="$(${LB_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}"
${LB_LOSETUP} "${DEVICE}" "${FILE}"
else
SECTORS="$(echo "$FDISK_OUT" | sed -ne "s|^$LOOPDEVICE[ *]*\([0-9]*\).*|\1|p")"
OFFSET="$(expr ${SECTORS} '*' 512)"
Echo_message "Mounting %s with offset %s" "${DEVICE}" "${OFFSET}"
${LB_LOSETUP} -o "${OFFSET}" "${DEVICE}" "${FILE}"
fi
}
# adapted from lib/ext2fs/mkjournal.c, default block size is 4096 bytes (/etc/mke2fs.conf).
ext2fs_default_journal_size()
{
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 ()
{
WITHOUT_JOURNAL_ORIGINAL_SIZE="${1}"
WITHOUT_JOURNAL_FILESYSTEM="${2}"
case "${WITHOUT_JOURNAL_FILESYSTEM}" in
ext2|ext3|ext4)
PERCENT="6"
;;
*)
PERCENT="3"
;;
esac
echo $(expr ${WITHOUT_JOURNAL_ORIGINAL_SIZE} + ${WITHOUT_JOURNAL_ORIGINAL_SIZE} \* ${PERCENT} / 100 + 1)
}
Calculate_partition_size ()
{
ORIGINAL_SIZE="${1}"
FILESYSTEM="${2}"
case "${FILESYSTEM}" in
ext3|ext4)
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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