I like that idea. But an option to block third-party software would need
to be lower-level than USC and gdebi, to also prevent someone from using
dpkg -i from the Terminal.
Third-party software could be blocked either at install time, as you
suggest, or at launch time. You link to a screenshot of GateKeeper,
which blocks it at launch time. The Mac has a framework called Launch
Services that is responsible for launching any application, including
checking whether it has ever been run before (LSQuarantine), whether it
is on the list of known malware (XProtect), whether anyone has
permission to run it (GateKeeper), and whether you in particular have
permission to run it (Parental Controls). I expect we would need
something equivalent at the kernel level if we hoped to block third-
party software at launch time.
** Also affects: dpkg (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1029157
Title:
User should be able to select allowed sources
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