sfdisk "$@" <partitions
lo=$$(losetup -f); image='$@'; \
start=$$(sfdisk --dump "$$image" |sed -rn 's;^.*start= *([0-9]+),.*type=83;\1;p'); \
sfdisk "$@" <partitions
lo=$$(losetup -f); image='$@'; \
start=$$(sfdisk --dump "$$image" |sed -rn 's;^.*start= *([0-9]+),.*type=83;\1;p'); \