microG won't work without being built into the OS. The most it would do is make apps think that Play Services is available but it's not going to work. GrapheneOS doesn't and won't support microG. Google Camera may work right now but it isn't supported and it can't be expected.
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You aren't using GrapheneOS, so what does or doesn't work isn't relevant. Even if you started from the official GrapheneOS releases, you modified the OS and made substantial changes incompatible with the core security features like verified boot and the official update system.
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No, you aren't using GrapheneOS. You created a derivative of GrapheneOS with substantial modifications. It's not GrapheneOS and you aren't a GrapheneOS user. You're responding to a thread about SELinux policies when you don't use our SELinux policies. It's really not relevant.
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You can use the Auditor app to confirm that you aren't running GrapheneOS. If you want to use GrapheneOS, you'll need to redo the installation process. You used GrapheneOS as the base to create an incompatible derivative OS with substantially weaker security. It's not GrapheneOS.
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You seem to be misunderstanding my tweets. You're using a derivative of it with substantial changes including different SELinux policies. It's very likely that what you've set up is going to break and you're already outside of what the update system is capable of supporting.
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A derivative of GrapheneOS is not relevant to our decisions about our SELinux policies, especially when it's substantially changing those policies.
Auditor can be used to verify a device is running GrapheneOS after following the official install guide: attestation.app/tutorial.
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GrapheneOS is not simply the system image portion of the OS. It's the whole operating system. If you were running GrapheneOS, you would be able to lock the bootloader to enable verified boot of the OS and then you could verify that you were running GrapheneOS with Auditor.
You're replaced the most core parts of the operating systems. You've made substantial changes. You aren't using the core of our OS and you've substantially rolled back the security provided by it, along with your changes not being compatible with how our update system works.
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Our update system uses delta updates when available. Those depend on the OS and firmware images being unaltered, including the boot image containing the core of the OS which you've heavily modified. Our changes also don't take what you're doing into account and it'll break.