Uninstalling via remove --cask --force obs then autoremove and cleanup still leave leftovers /obs-studio/ and crap in /SystemExtensions/

[alemens]

Verification

• I understand that if I ignore these instructions, my issue may be closed without review.
• I have retried my command with --force.
• I ran brew update-reset && brew update and retried my command.
• I ran brew doctor, fixed as many issues as possible and retried my command.
• I have checked the instructions for reporting bugs.
• I made doubly sure this is not a checksum does not match / SHA256 mismatch error (do not open an issue before trying to open a PR to fix first).

Description of issue

brew remove --cask --force obs then brew autoremove then brew cleanup still leave leftovers so rm -rf ~/Library/Application\ Support/obs-studio/ after all still have crap in /Library/SystemExtensions/E0244F9B-9E54-406A-B59C-116650454FBB/com.obsproject.obs-studio.mac-camera-extension.systemextension and /System/Volumes/Data/Library/SystemExtensions/E0244F9B-9E54-406A-B59C-116650454FBB/com.obsproject.obs-studio.mac-camera-extension.systemextension can’t be deleted

Command that failed

sudo rm -f /Library/SystemExtensions/E0244F9B-9E54-406A-B59C-116650454FBB/com.obsproject.obs-studio.mac-camera-extension.systemextension/Contents/Info.plist

Output of command with --verbose --debug

rm: /Library/SystemExtensions/E0244F9B-9E54-406A-B59C-116650454FBB/com.obsproject.obs-studio.mac-camera-extension.systemextension/Contents/Info.plist: Operation not permitted

Output of brew doctor and brew config

`brew doctor`
Your system is ready to brew.

`brew config`
HOMEBREW_VERSION: 4.2.16-69-gfcc190b
ORIGIN: https://github.com/Homebrew/brew
HEAD: fcc190b5c659d9c74454011f094de568789ef8fd
Last commit: 8 hours ago
Core tap HEAD: bfe8e71e3328538b3ff2f55182b6fb75fe3a7513
Core tap last commit: 19 minutes ago
Core tap JSON: 04 Apr 02:47 UTC
Core cask tap HEAD: 1d92b1d863df35b1d72e246c5cbc188dfb261b61
Core cask tap last commit: 65 minutes ago
Core cask tap JSON: 04 Apr 02:47 UTC
HOMEBREW_PREFIX: /usr/local
HOMEBREW_CASK_OPTS: []
HOMEBREW_DISPLAY: /private/tmp/com.apple.launchd.lyXPfsMiKa/org.xquartz:0
HOMEBREW_MAKE_JOBS: 8
HOMEBREW_SORBET_RUNTIME: set
Homebrew Ruby: 3.1.4 => /usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/3.1.4/bin/ruby
CPU: octa-core 64-bit kabylake
Clang: 15.0.0 build 1500
Git: 2.44.0 => /usr/local/bin/git
Curl: 8.4.0 => /usr/bin/curl
macOS: 14.4.1-x86_64
CLT: 15.3.0.0.1.1708646388
Xcode: N/A

Output of brew tap

/

[bevanjkay]

To remove all the files associated with a cask, you need to pass the --zap flag to brew uninstall.
e.g. brew uninstall --zap obs

Regarding the system extension, as far as I know this is a MacOS system-level limitation, and this would be the same case were you to remove the application the usual way (it is not a Homebrew-specific limitation).

[alemens]

Bypassing MacOS system-level limitation with Disabling and Enabling System Integrity Protection then solved with

• run csrutil disable in a Recovery mode terminal
• restart normal and deleting unwanted folders inside /SystemExtensions/
• run csrutil enable again in a Recovery mode terminal then restart normal

thanks to @bevanjkay for the e.g. brew uninstall --zap obs and clear explanation

[bevanjkay]

Thanks for confirming @alemens

For anyone stumbling upon this, please read Apple's documentation about System Integrity Protection here, before disabling it.