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mkimage.sh: atomically allocate loop devices; allow >= loop10 devs

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This commit is contained in:
Calin Crisan 2018-04-14 22:03:35 +03:00
parent 6912ed67c4
commit 2549027dce
1 changed files with 12 additions and 29 deletions
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41
board/common/mkimage.sh
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@ -11,18 +11,6 @@ function msg() {
echo " * $1"
}
function cleanup {
set +e
# unmount loop mounts
mount | grep /dev/loop | cut -d ' ' -f 3 | xargs -r umount
# remove loop devices
losetup -a | cut -d ':' -f 1 | xargs -r losetup -d
}
trap cleanup EXIT
PART_START=${PART_START:-2048} # 2048 sectors = 1MB
BOOT_SRC=$IMG_DIR/boot
@ -43,8 +31,7 @@ OS_NAME=$(source $COMMON_DIR/overlay/etc/version && echo $os_short_name)
# boot filesystem
msg "creating boot loop device"
dd if=/dev/zero of=$BOOT_IMG bs=1M count=$BOOT_SIZE
loop_dev=$(losetup -f)
losetup -f $BOOT_IMG
loop_dev=$(losetup -f --show $BOOT_IMG)
msg "creating boot filesystem"
mkfs.vfat -F16 $loop_dev
@ -60,15 +47,14 @@ sync
msg "unmounting boot filesystem"
umount $BOOT
msg "destroying boot loop device"
msg "destroying boot loop device ($loop_dev)"
losetup -d $loop_dev
sync
# root filesystem
msg "creating root loop device"
dd if=/dev/zero of=$ROOT_IMG bs=1M count=$ROOT_SIZE
loop_dev=$(losetup -f)
losetup -f $ROOT_IMG
loop_dev=$(losetup -f --show $ROOT_IMG)
msg "creating root filesystem"
mkfs.ext4 $loop_dev
@ -104,7 +90,7 @@ fi
msg "unmounting root filesystem"
umount $ROOT
msg "destroying root loop device"
msg "destroying root loop device ($loop_dev)"
losetup -d $loop_dev
sync
@ -129,8 +115,7 @@ if [ -n "$UBOOT_BIN" ] && [ -n "$UBOOT_SEEK" ]; then
msg "copying u-boot image"
dd conv=notrunc if=$UBOOT_BIN of=$DISK_IMG bs=512 seek=$UBOOT_SEEK
fi
loop_dev=$(losetup -f)
losetup -f $DISK_IMG
loop_dev=$(losetup -f --show $DISK_IMG)
msg "partitioning disk"
root_part_start=$(($PART_START + $BOOT_SIZE * 2048))
@ -159,33 +144,31 @@ set -e
sync
msg "reading partition offsets"
boot_offs=$(fdisk -u=sectors -l $loop_dev | grep -E 'loop[[:digit:]]p1' | tr -d '*' | tr -s ' ' | cut -d ' ' -f 2)
root_offs=$(fdisk -u=sectors -l $loop_dev | grep -E 'loop[[:digit:]]p2' | tr -d '*' | tr -s ' ' | cut -d ' ' -f 2)
boot_offs=$(fdisk -u=sectors -l $loop_dev | grep -E 'loop([[:digit:]])+p1' | tr -d '*' | tr -s ' ' | cut -d ' ' -f 2)
root_offs=$(fdisk -u=sectors -l $loop_dev | grep -E 'loop([[:digit:]])+p2' | tr -d '*' | tr -s ' ' | cut -d ' ' -f 2)
msg "destroying disk loop device"
msg "destroying disk loop device ($loop_dev)"
losetup -d $loop_dev
msg "creating boot loop device"
loop_dev=$(losetup -f)
losetup -f -o $(($boot_offs * 512)) $DISK_IMG
loop_dev=$(losetup -f --show -o $(($boot_offs * 512)) $DISK_IMG)
msg "copying boot image"
dd if=$BOOT_IMG of=$loop_dev
sync
msg "destroying boot loop device"
msg "destroying boot loop device ($loop_dev)"
losetup -d $loop_dev
msg "creating root loop device"
loop_dev=$(losetup -f)
losetup -f -o $(($root_offs * 512)) $DISK_IMG
loop_dev=$(losetup -f --show -o $(($root_offs * 512)) $DISK_IMG)
sync
msg "copying root image"
dd if=$ROOT_IMG of=$loop_dev
sync
msg "destroying root loop device"
msg "destroying root loop device ($loop_dev)"
losetup -d $loop_dev
sync