wic: Add --embed-rootfs argument

This option adds the content of a rootfs on a specific location on the
rootfs.

It is very useful for making a partition that contains the rootfs for a
host and a target Eg:

/ -> Roofs for the host
/export/ -> Rootfs for the target (which will netboot)

Although today we support making a partition for "/export" this might
not be compatible with some upgrade systems, or we might be limited by
the number of partitions.

With this patch we can use something like:

part / --source rootfs --embed-rootfs target-image /export --embed-rootfs target-image2 /export2

on the .wks file.

(From OE-Core rev: efdcf94801f6abe8e4099e324d9a3deccd8d4384)

Signed-off-by: Ricardo Ribalda Delgado <ricardo@ribalda.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/scripts/lib/wic/help.py b/scripts/lib/wic/help.py
index 1e3d06a87b..f1afd903ac 100644
--- a/scripts/lib/wic/help.py
+++ b/scripts/lib/wic/help.py
@@ -980,6 +980,14 @@ DESCRIPTION
                          copies. This option only has an effect with the rootfs
                          source plugin.
 
+         --embed-rootfs: This option is specific to wic. It embeds a rootfs into
+                         the given path to the resulting image. The option
+                         contains two fields, the roofs and the path, separated
+                         by a space. The rootfs follows the same logic as the
+                         rootfs-dir argument. Multiple options can be provided
+                         in order to embed multiple rootfs. This option only has
+                         an effect with the rootfs source plugin.
+
          --extra-space: This option is specific to wic. It adds extra
                         space after the space filled by the content
                         of the partition. The final size can go