[202012] Fix CONFIG_DB_INITIALIZED flag check logic and set/reset flag for warmboot

[vaibhavhd]

Cherry pick of #15685

MSFT ADO: 24274591

Why I did it

Two changes:

1 Fix a day1 issue, where check to wait until CONFIG_DB_INITIALIZED is incorrect.

There are multiple places where same incorrect logic is used.

Current logic (until [[ $($SONIC_DB_CLI CONFIG_DB GET "CONFIG_DB_INITIALIZED") ]];) will always result in pass, irrespective of the result of GET operation.

root@str2-7060cx-32s-29:~# sonic-db-cli CONFIG_DB GET "CONFIG_DB_INITIALIZED"
1
root@str2-7060cx-32s-29:~# until [[ $(sonic-db-cli CONFIG_DB GET "CONFIG_DB_INITIALIZED") ]]; do echo "entered here"; done
root@str2-7060cx-32s-29:~# 

root@str2-7060cx-32s-29:~# 
root@str2-7060cx-32s-29:~# sonic-db-cli CONFIG_DB GET "CONFIG_DB_INITIALIZED"                                             
0
root@str2-7060cx-32s-29:~# until [[ $(sonic-db-cli CONFIG_DB GET "CONFIG_DB_INITIALIZED") ]]; do echo "entered here"; done
root@str2-7060cx-32s-29:~# 

Fix this logic by checking for value of flag to be "1".

root@str2-7060cx-32s-29:~# until [[ $(sonic-db-cli CONFIG_DB GET "CONFIG_DB_INITIALIZED") -eq 1 ]]; do echo "entered here"; done
entered here
entered here
entered here

This gap in logic was highlighted when another fix was merged: #14933
The issue being fixed here caused warmboot-finalizer to not wait until config-db is initialized.

2 Set and unset CONFIG_DB_INITIALIZED for warm-reboot case

Currently, during warm shutdown CONFIG_DB_INITIALIZED's value is stored in redis db backup. This is restored back when the dump is loaded during warm-recovery.
So the value of CONFIG_DB_INITIALIZED does not depend on config db's state, however it remain what it was before reboot.

Fix this by setting CONFIG_DB_INITIALIZED to 0 as when the DB is loaded, and set it to 1 after db_migrator is done.

Work item tracking

• Microsoft ADO (number only):

How I did it

How to verify it

Which release branch to backport (provide reason below if selected)

• 201811
• 201911
• 202006
• 202012
• 202106
• 202111
• 202205
• 202211
• 202305

Tested branch (Please provide the tested image version)

Description for the changelog

Link to config_db schema for YANG module changes

A picture of a cute animal (not mandatory but encouraged)

[vaibhavhd]

@qiluo-msft please take this change to 202012. Thanks