[Bug 1766491] [NEW] kylin-display-switch crashed with PermissionError and TypeError

[Launchpad Bug Tracker]

You have been subscribed to a public bug by handsome_feng (feng-kylin):

[Impact]
when switch user:
kylin_display_switch.py crashed with PermissionError in check_singleton():[Errno 13]权限不够:/tmp/instance_kds.lock';
kylin_display_switch.py crashed with TypeError in slot_tip_numlock():'>' not supported between instances of 'bultin_function_or_method' and 'int'

[Test Case]
1. Login
2. Switch User
Expected Result:Passed
Actual Result:
1. kylin_display_switch.py crashed with TypeError
2. kylin_display_switch.py crashed with PermissionError

[Regression Potential]
Low, The first change is to allow all user to access the instance_kds.lock, and the second change is add the missing parentheses.

** Affects: ubuntukylin
     Importance: Undecided
     Assignee: Shine Huang (shine)
         Status: Fix Released

** Affects: kylin-display-switch (Ubuntu)
     Importance: Undecided
         Status: Fix Released


** Tags: bionic-beta2
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kylin-display-switch crashed with PermissionError and TypeError
https://bugs.launchpad.net/bugs/1766491
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