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mkdisk: attach and detach loop device after each operation.

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This commit is contained in:
Ricardo Martins 2015-10-02 12:38:23 +01:00
parent 1afee2214f
commit 8837ab35e8
1 changed files with 39 additions and 19 deletions
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58
mkdisk.bash
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@ -24,16 +24,16 @@
cmd_parted() cmd_parted()
{ {
dev="$1"; shift bdev="$1"; shift
"$cmd_parted" "$dev" -a cylinder -s -- $@ "$cmd_parted" "$bdev" -a cylinder -s -- $@
} }
cmd_mount() cmd_mount()
{ {
fs="$1" fs="$1"
dev="$2" bdev="$2"
mkdir -p mount && mkdir -p mount &&
mount -t "$fs" "$dev" mount mount -t "$fs" "$bdev" mount
} }
cmd_unmount() cmd_unmount()
@ -47,7 +47,7 @@ cmd_unmount()
die() die()
{ {
umount mount > /dev/null 2>&1 umount -v mount > /dev/null 2>&1
rmdir mount > /dev/null 2>&1 rmdir mount > /dev/null 2>&1
[ -n "$dev_loop" ] && losetup -d "$dev_loop" [ -n "$dev_loop" ] && losetup -d "$dev_loop"
exit 1 exit 1
@ -253,27 +253,46 @@ if [ -z "$cfg_partitions" ]; then
) )
fi fi
# Loop device. cmd_loop_attach()
dev_loop="$(losetup -f)" {
export dev="$1"
export dev_loop="$(losetup -f)"
nfo1 "Attaching $dev to $dev_loop" nfo1 "Attaching $dev to $dev_loop"
losetup -v "$dev_loop" "$dev" losetup -v "$dev_loop" "$dev"
if [ $? -ne 0 ]; then if [ $? -ne 0 ]; then
unset dev_loop
die
fi
}
cmd_loop_detach()
{
nfo1 "Detaching $dev_loop"
sync && sync && sync && sync
blockdev --flushbufs "$dev_loop"
losetup -v -d "$dev_loop"
sync && sync && sync && sync
unset dev_loop unset dev_loop
die }
fi
nfo1 "Obliterating partition table" nfo1 "Obliterating partition table"
cmd_loop_attach "$dev"
dd if=/dev/zero of="$dev_loop" bs=1 count=1M count=32 > /dev/null 2>&1 || die dd if=/dev/zero of="$dev_loop" bs=1 count=1M count=32 > /dev/null 2>&1 || die
losetup -a
cmd_loop_detach
losetup -a
nfo1 "Creating empty partition table" nfo1 "Creating empty partition table"
cmd_parted "$dev_loop" \ cmd_loop_attach "$dev"
mklabel msdos \ cmd_parted "$dev_loop" mklabel msdos || die
|| die cmd_loop_detach
part_nr=1 part_nr=1
xboot_system_id=0 xboot_system_id=0
for ((i = 0; i < ${#cfg_partitions[@]}; i += 4)); do for ((i = 0; i < ${#cfg_partitions[@]}; i += 4)); do
cmd_loop_attach "$dev"
part_type="${cfg_partitions[$i+0]}" part_type="${cfg_partitions[$i+0]}"
part_label="${cfg_partitions[$i+1]}" part_label="${cfg_partitions[$i+1]}"
part_start="${cfg_partitions[$i+2]}" part_start="${cfg_partitions[$i+2]}"
@ -301,22 +320,23 @@ for ((i = 0; i < ${#cfg_partitions[@]}; i += 4)); do
;; ;;
esac esac
cmd_loop_detach
let part_nr++ let part_nr++
done done
if [ -f "$cfg_sys_family/rootfs/boot/extlinux/mbr.bin" ]; then if [ -f "$cfg_sys_family/rootfs/boot/extlinux/mbr.bin" ]; then
nfo1 "Installing bootloader in MBR..." nfo1 "Installing bootloader in MBR..."
cmd_loop_attach "$dev"
dd if="$cfg_sys_family/rootfs/boot/extlinux/mbr.bin" of="$dev_loop" > /dev/null 2>&1 dd if="$cfg_sys_family/rootfs/boot/extlinux/mbr.bin" of="$dev_loop" > /dev/null 2>&1
cmd_loop_detach
fi fi
nfo1 "Synchronizing caches" nfo1 "Synchronizing caches"
sync && sync && sync && sync && sync && sync sync && sync && sync && sync && sync && sync
blockdev --flushbufs "$dev_loop" || die
# Make sure the partition has 0x0e type. # Make sure the partition has 0x0e type.
if [ $xboot_system_id -eq 1 ]; then if [ $xboot_system_id -eq 1 ]; then
cmd_loop_attach "$dev"
echo -en "t\n1\ne\nw\n" | $cmd_fdisk "$dev_loop" > /dev/null 2>&1 echo -en "t\n1\ne\nw\n" | $cmd_fdisk "$dev_loop" > /dev/null 2>&1
cmd_loop_detach
fi fi
nfo1 "Detaching loop device $dev_loop"
losetup -v -d "$dev_loop"