build/cfg/rpi3/genimage.sh

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#!/bin/sh
set -u -e -x
FILE=$1
MOUNTED=0
LOOPATTACHED=0
function do_cleanup() {
[ $MOUNTED -ne 0 ] && umount /tmp/mnt.$$
[ $LOOPATTACHED -ne 0 ] && losetup -d ${LODEV}
rmdir /tmp/mnt.$$
}
trap do_cleanup ERR INT
cd `dirname $0`
truncate -s 1G $FILE
parted --script $FILE \
"mklabel msdos" \
"mkpart primary fat32 1M 256M" \
"mkpart primary btrfs 256M 100%" \
"set 1 boot on"
LODEV=$(losetup -f)
losetup -P ${LODEV} ${FILE}
LOOPATTACHED=1
mkfs.vfat ${LODEV}p1
mkfs.btrfs -f ${LODEV}p2
mkdir /tmp/mnt.$$
mount -t vfat ${LODEV}p1 /tmp/mnt.$$
MOUNTED=1
cp -r boot/* /tmp/mnt.$$/
umount /tmp/mnt.$$
MOUNTED=0
mount -t btrfs ${LODEV}p2 /tmp/mnt.$$
MOUNTED=1
mkdir /tmp/mnt.$$/etc /tmp/mnt.$$/etc_work
mkdir /tmp/mnt.$$/var_lib /tmp/mnt.$$/var_lib_work
umount /tmp/mnt.$$
MOUNTED=0
losetup -d ${LODEV}
LOOPATTACHED=0
rmdir /tmp/mnt.$$