wic: Fix usage of fstype=none in wic

This allows to specify partition with fstype=none in the wks file
to have partition created but without following mkfs. The none fstype
is in the list already but the usage is not documented.

Example;
part /data --ondisk mmcblk0 --fstype=none  --align 4096 --fixed-size 512

will create a partition, filesystem may be created manualy on the host
or target and data will be preserved if the device is reflashed using
same wks. Works with bmaptool and probably does not work with dd.
Use case is persistent filesystem/data between reflashing of the image.

Signed-off-by: Pavel Zhukov <pavel@zhukoff.net>
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 351cb64da37aa43113e5192605d04436652aa3b8)
Signed-off-by: Steve Sakoman <steve@sakoman.com>

diff --git a/scripts/lib/wic/partition.py b/scripts/lib/wic/partition.py
index 2a916e077c0e489bab59b06586e59ce851996316..382afa44bce804054e38ff5d657341357d612f29 100644 (file)
--- a/scripts/lib/wic/partition.py
+++ b/scripts/lib/wic/partition.py
@@ -133,6 +133,8 @@ class Partition():
             self.update_fstab_in_rootfs = True
 
         if not self.source:
+            if self.fstype == "none":
+                return
             if not self.size and not self.fixed_size:
                 raise WicError("The %s partition has a size of zero. Please "
                                "specify a non-zero --size/--fixed-size for that "
@@ -405,6 +407,9 @@ class Partition():
                        (extraopts, self.fsuuid, rootfs, rootfs_dir)
         exec_native_cmd(erofs_cmd, native_sysroot, pseudo=pseudo)
 
+    def prepare_empty_partition_none(self, rootfs, oe_builddir, native_sysroot):
+        pass
+
     def prepare_empty_partition_ext(self, rootfs, oe_builddir,
                                     native_sysroot):
         """