I'm going to check if there is a good way to merge config at upgrade or boot up.
For example, at firmware A, we already have following fstab.
config mount option device '/dev/mmcblk0p1' option target '/mnt' option enabled '1'
When we upgrade firmware B from A, we would like to have following fstab.
config mount option device '/dev/mmcblk0p1' option target '/mnt/media' option enabled '1'
You can see, we would like to upgrade the options at config, too.
So far, I know uci-default can help me to modify each options we need at first boot.
But, I would like to have a common way to merge config instead of uci-default.
For example, the common way like that system boot up will loading fstab from B and merge fstab from overlay(firmware A).
Please help. Thanks a lot.