[FS#826] Better implementation of upgrade system on lede

[LEDE Bugs]

The following task has a new comment added:

FS#826 - Better implementation of upgrade system on lede
User who did this - Yousong Zhou (yousong)

----------
A simple solution can be


# before sysupgrade
opkg list-installed | cut -f1 -d' ' >old
# after sysupgrade
opkg list-installed | cut -f1 -d' ' >new
# find the diff
sort old new | uniq -u >requested-and-their-deps


But usually I only have one or two extra packages installed after sysupgrade, so I don't need to bother to go such length to figure them out...  It's not like debian which I build the environment incrementally over time.  The boxes I have LEDE on are mostly of one-time setup and serve all the time type.
----------

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=826#comment2746