80 lines
1.9 KiB
Bash
Executable File
80 lines
1.9 KiB
Bash
Executable File
#!/bin/sh
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## live-build(7) - System Build Scripts
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## Copyright (C) 2006-2012 Daniel Baumann <daniel@debian.org>
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##
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## This program comes with ABSOLUTELY NO WARRANTY; for details see COPYING.
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## This is free software, and you are welcome to redistribute it
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## under certain conditions; see COPYING for details.
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Lodetach ()
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{
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DEVICE="${1}"
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ATTEMPT="${2:-1}"
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if [ "${ATTEMPT}" -gt 3 ]
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then
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Echo_error "Failed to detach loop device '${DEVICE}'."
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exit 1
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fi
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# Changes to block devices result in uevents which trigger rules which in
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# turn access the loop device (ex. udisks-part-id, blkid) which can cause
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# a race condition. We call 'udevadm settle' to help avoid this.
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if [ -x "$(which udevadm 2>/dev/null)" ]
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then
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${LB_ROOT_COMMAND} udevadm settle
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fi
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# Loop back devices aren't the most reliable when it comes to writes.
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# We sleep and sync for good measure - better than build failure.
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sync
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sleep 1
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${LB_ROOT_COMMAND} ${LB_LOSETUP} -d "${DEVICE}" || Lodetach "${DEVICE}" "$(expr ${ATTEMPT} + 1)"
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}
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Losetup ()
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{
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DEVICE="${1}"
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FILE="${2}"
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PARTITION="${3:-1}"
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${LB_ROOT_COMMAND} ${LB_LOSETUP} --read-only "${DEVICE}" "${FILE}"
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FDISK_OUT="$(${LB_FDISK} -l -u ${DEVICE} 2>&1)"
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Lodetach "${DEVICE}"
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LOOPDEVICE="$(echo ${DEVICE}p${PARTITION})"
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if [ "${PARTITION}" = "0" ]
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then
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Echo_message "Mounting %s with offset 0" "${DEVICE}"
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${LB_ROOT_COMMAND} ${LB_LOSETUP} "${DEVICE}" "${FILE}"
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else
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SECTORS="$(echo "$FDISK_OUT" | sed -ne "s|^$LOOPDEVICE[ *]*\([0-9]*\).*|\1|p")"
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OFFSET="$(expr ${SECTORS} '*' 512)"
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Echo_message "Mounting %s with offset %s" "${DEVICE}" "${OFFSET}"
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${LB_ROOT_COMMAND} ${LB_LOSETUP} -o "${OFFSET}" "${DEVICE}" "${FILE}"
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fi
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}
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Calculate_partition_size ()
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{
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ORIGINAL_SIZE="${1}"
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FILESYSTEM="${2}"
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case "${FILESYSTEM}" in
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ext2|ext3|ext4)
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PERCENT="5"
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;;
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*)
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PERCENT="3"
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;;
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esac
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echo $(expr ${ORIGINAL_SIZE} + ${ORIGINAL_SIZE} \* ${PERCENT} / 100 + 1)
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}
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