wic: Add --change-directory argument
This option allows to specify which part of a rootfs is going to be
included, the same way the -C argument on tar.
Thanks to this option we can make sure the permissions and usernames
on the target partition are respected, and also simplify the creation of
splitted partitons, not neeting to invoke external vars or using .wks.in
files. Eg:
part / --source rootfs --ondisk sda --fstype=ext4 --exclude-path=etc/
part /etc --source rootfs --fstype=ext4 --change-directory=etc
Cc: Paul Barker <pbarker@konsulko.com>
Signed-off-by: Ricardo Ribalda Delgado <ricardo@ribalda.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit
2265d089a58e1f78f26d623ee667c420cb1c3bd4)
Signed-off-by: Steve Sakoman <steve@sakoman.com>
