[OE-core][RFC][PATCH][dunfell] wic: Add --use-stock-fstab option

["Daniel Gomez" <daniel@qtec.com>]

When embeddding rootfs image (e.g. 'rootfs-dir') as a partition we
might want to keep the stock fstab for that image. In such case, use
this option to not update the fstab and use the stock one instead.

This option allows to specify which partitions get the updated fstab
and which get the stock fstab.

Example:
    part /export --source rootfs --rootfs-dir=hockeycam-image
    --fstype=ext4 --label export --align 1024 --use-stock-fstab

    part / --source rootfs --fstype=ext4 --label rootfs --align 1024

Signed-off-by: Daniel Gomez <daniel@qtec.com>
---

The commit-id ce682a73b7447652f898ce1d1d0416a456df5416 reverted the
functionality to restore the stock/original fstab file in a rootfs
partition image (wic plugin).

Add back such functionality with an option to the user to select which
fstab will be used for each partition by adding the --use-stock-fstab.
In this case, the user will select whether or not the stock fstab will
be updated or kept.

If you agree with the patch I'll adapt it to the master branch.

Daniel

 scripts/lib/wic/ksparser.py  | 1 +
 scripts/lib/wic/partition.py | 3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/scripts/lib/wic/ksparser.py b/scripts/lib/wic/ksparser.py
index 452a160232..64933e0a5b 100644
--- a/scripts/lib/wic/ksparser.py
+++ b/scripts/lib/wic/ksparser.py
@@ -184,6 +184,7 @@ class KickStart():
         part.add_argument('--use-uuid', action='store_true')
         part.add_argument('--uuid')
         part.add_argument('--fsuuid')
+        part.add_argument('--use-stock-fstab', action='store_true')

         bootloader = subparsers.add_parser('bootloader')
         bootloader.add_argument('--append')
diff --git a/scripts/lib/wic/partition.py b/scripts/lib/wic/partition.py
index 85f9847047..c9e45773de 100644
--- a/scripts/lib/wic/partition.py
+++ b/scripts/lib/wic/partition.py
@@ -54,6 +54,7 @@ class Partition():
         self.uuid = args.uuid
         self.fsuuid = args.fsuuid
         self.type = args.type
+        self.use_stock_fstab = args.use_stock_fstab
         self.updated_fstab_path = None
         self.has_fstab = False
         self.update_fstab_in_rootfs = False
@@ -286,7 +287,7 @@ class Partition():
             (self.fstype, extraopts, rootfs, label_str, self.fsuuid, rootfs_dir)
         exec_native_cmd(mkfs_cmd, native_sysroot, pseudo=pseudo)

-        if self.updated_fstab_path and self.has_fstab:
+        if self.updated_fstab_path and self.has_fstab and not self.use_stock_fstab:
             debugfs_script_path = os.path.join(cr_workdir, "debugfs_script")
             with open(debugfs_script_path, "w") as f:
                 f.write("cd etc\n")
--
2.30.2