Check working directory and change to root before listing files

[TranceLove]

Description

Also fixes line parsing of filenames having colons as I work on, listing files under /dev.

Issue tracker

Fixes #3476

Automatic tests

• [ ] Added test cases

Manual tests

• [ ] Done

Build tasks success

Successfully running following tasks on local:

• [x] ./gradlew assembledebug
• [x] ./gradlew spotlessCheck