[scripts] improved (complete rewrite) of mkcard.txt to work with loop devices

This commit is contained in:
Fabio Erculiani 2011-12-28 16:17:12 +01:00
parent d90a9b251b
commit 85bfc9c33a

142
scripts/mkloopcard.txt Executable file
View File

@ -0,0 +1,142 @@
#! /bin/sh
# (c) Copyright 2012 Fabio Erculiani <lxnay@sabayon.org>
# Licensed under terms of GPLv2
export LC_ALL=C
# Expected env variables:
# PATHS_TO_REMOVE = ";" separated list of paths to rm -rf
# PATHS_TO_EMPTY = ";" separated list of paths to rm -rf (keeping the dir)
if [ ${#} -ne 4 ]; then
echo "usage: ${0} <path to regular file containing the image> <size in Mb> <source boot files dir> <source chroot>"
exit 1
fi
FILE="${1}"
SIZE="${2}"
BOOT_DIR="${3}"
CHROOT_DIR="${4}"
cleanup_loopbacks() {
sync
sync
sleep 5
sync
[[ -n "${vfat_part}" ]] && losetup -d "${vfat_part}" 2> /dev/null
[[ -n "${ext_part}" ]] && losetup -d "${ext_part}" 2> /dev/null
[[ -n "${DRIVE}" ]] && losetup -d "${DRIVE}" 2> /dev/null
[[ -n "${tmp_dir}" ]] && { umount "${tmp_dir}" &> /dev/null; rmdir "${tmp_dir}" &> /dev/null; }
}
trap "cleanup_loopbacks" 1 2 3 6 9 14 15 EXIT
# Erase the file
echo "Generating the empty image file at ${FILE}"
dd if=/dev/zero of="${FILE}" bs=1024000 count="${SIZE}"
[[ "$?" != "0" ]] && exit 1
DRIVE=$(losetup -f "${FILE}" --show 2> /dev/null)
if [ -z "${DRIVE}" ]; then
echo "Cannot execute losetup for $FILE"
exit 1
fi
echo "Configured the loopback partition at ${DRIVE}"
# Calculate size using fdisk
SIZE=$(fdisk -l "${DRIVE}" | grep Disk | grep bytes | awk '{print $5}')
CYLINDERS=$((SIZE/255/63/512))
# Magic first partition size, given 9 cylinders below
MAGICSIZE="73995264"
STARTOFFSET="32256"
echo "Disk size : ${SIZE} bytes"
echo "Disk cyls : ${CYLINDERS}"
echo "Magic size : ${MAGICSIZE} bytes (boot part size)"
echo "Start offset : ${STARTOFFSET} bytes"
# this will create a first partition that is 73995264 bytes long
# Starts at sect 63, ends at sect 144584, each sector is 512bytes
# In fact it creates 9 cyls
{
echo ,9,0x0C,*
echo ,,,-
} | sfdisk -D -H 255 -S 63 -C $CYLINDERS $DRIVE
sleep 2
# The second partiton will start at block 144585, get the end block
ENDBLOCK=$(fdisk -l "${DRIVE}" | grep "${DRIVE}p2" | awk '{print $3}')
EXTSIZE=$(((ENDBLOCK - 144585) * 512))
# Get other two loopback devices first
EXTOFFSET=$((STARTOFFSET + MAGICSIZE))
echo "ExtFS size : ${EXTSIZE} bytes"
echo "ExtFS offset : ${EXTOFFSET} bytes"
# Get other two loopback devices first
vfat_part=$(losetup -f --offset "${STARTOFFSET}" --sizelimit "${MAGICSIZE}" "${FILE}" --show 2> /dev/null)
if [ -z "${vfat_part}" ]; then
echo "Cannot setup the vfat partition loopback"
exit 1
fi
ext_part=$(losetup -f --offset "${EXTOFFSET}" --sizelimit "${EXTSIZE}" "${FILE}" --show 2> /dev/null)
if [ -z "${ext_part}" ]; then
echo "Cannot setup the ext3 partition loopback"
exit 1
fi
echo "VFAT Partiton at : ${vfat_part}"
echo "ExtFS Partition at : ${ext_part}"
# Format vfat
echo "Formatting VFAT ${vfat_part}..."
mkfs.vfat -n "boot" -F 32 "${vfat_part}" || exit 1
# Format extfs
echo "Formatting ExtFS ${ext_part}..."
mkfs.ext3 -L "Sabayon" "${ext_part}" || exit 1
tmp_dir=$(mktemp -d)
if [ -z "${tmp_dir}" ]]; then
echo "Cannot create temporary dir"
exit 1
fi
chmod 755 "${tmp_dir}" || exit 1
sleep 2
sync
echo "Setting up the boot directory content, mounting on ${tmp_dir}"
mount "${vfat_part}" "${tmp_dir}"
cp -R "${BOOT_DIR}"/* "${tmp_dir}"/ || exit 1
umount "${tmp_dir}" || exit 1
echo "Setting up the extfs directory content, mounting on ${tmp_dir}"
mount "${ext_part}" "${tmp_dir}"
rsync -avP _H -A -X --delete-during "${CHROOT_DIR}"/ "${tmp_dir}"/ || exit 1
# work out paths to empty and paths to remove
# XXX
oldifs="${IFS}"
IFS=";"
for path in "${tmp_dir}"/${PATHS_TO_REMOVE}; do
if [ -e "${path}" ]; then
echo "Removing: ${path}"
rm -rf "${path}"
fi
done
for path in "${tmp_dir}"/${PATHS_TO_EMPTY}; do
if [ -d "${path}" ]; then
echo "Emptying: ${path}"
rm -rf "${path}"/*
fi
done
IFS="${oldifs}"
umount "${tmp_dir}" || exit 1
cleanup_loopbacks
echo "Your MMC image \"${FILE}\" is ready"