usbguard-rule-parser: Handle rules file opening error (fixes #530)

USBGuard / usbguard

USBGuard is a software framework for implementing USB device authorization policies (what kind of USB devices are authorized) as well as method of use policies (how a USB device may interact with the system)

https://usbguard.github.io/

GNU General Public License v2.0

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usbguard-rule-parser: Handle rules file opening error (fixes #530) #533

Closed hartwork closed 2 years ago

hartwork commented 2 years ago

Fixes #530

New behavior:

$ ./usbguard-rule-parser -f /no/such/file ; echo $?
! ERROR: Rules file could not be opened: /no/such/file: No such file or directory
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