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guysoft / OctoPi

Scripts to build OctoPi, a Raspberry PI distro for controlling 3D printers over the web
GNU General Public License v3.0
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Rebuild Pi kernel to enable UUID on kernel cmdline and in /etc/fstab #437

Closed mjeveritt closed 6 years ago

mjeveritt commented 6 years ago

Currently the Raspberry Pi kernels only support PARTUUID for partition identification. It would be helpful to use the full UUID for this, as being more distinct, but this requires building a small initrd to permit the appropriate /dev/by-XXX to be populated by mdev/etc. The kernel configuration options for this is documented in the R-Pi kernel repository in issue #392.

guysoft commented 6 years ago

Adding this to the build would make it take about 12 hours (time it takes to build RealtimePi).However making a variant should be easy with the kernel module. Or a base-image with a custom kernel and use that.

I'm not sure I fully understand why you would want this feature in OctoPi, how does it benefit the user?

mjeveritt commented 6 years ago

Are you building on host - I am fairly good at cross-building kernels on x86_64 hardware, so it won't be onerous for me! I'll see if I can work out the config, and give your scripts a whirl to see if I can inject a new kernel into the distro.

The reason for the feature is that UUIDs are fairly universal and fairly stable as partition identifiers, and whilst they do require a bit of extra trickery to 'work' I think the benefit does outweigh the cost.

guysoft commented 6 years ago

What kind of impact this has to the user? I am not sure if changing the kernel is worth it, because I can't think of a scenario where this would change anything to the end user. I also asked this in the last comment. Please explain if you do know of a scenario.

guysoft commented 6 years ago

Hey, There is now a kernel module in CustomPiOS. This lets you build a custom kernel within CustomPiOS. However it takes a good 12 hours. You could easily make your own variant. Also, once you have a base image you can build OctoPi on top of it.

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