Support kernel >=5.1

[zimmski]

Describe the bug

Some kernel modules that do not exist with kernel >=5.1 anymore, e.g. https://cateee.net/lkddb/web-lkddb/NF_NAT_IPV4.html, are required by the gravity preflight checks. Hence, Gravity cannot be installed e.g. on openSUSE's MicroOS.

To Reproduce
Install a VM e.g. with the latest openSUSE MicroOS which is using kernel 5.2 (at the moment) and try to install gravity.

Expected behavior
The expectation is that Gravity is supported on every modern distribution. Hence, also on distributions with a newer kernel.

Logs

...
[×] required kernel boot config parameter CONFIG_NF_NAT_IPV4 missing
[×] required kernel boot config parameter CONFIG_NF_NAT_NEEDED missing

Environment (please complete the following information):

• OS openSUSE MicroOS
• Gravity 6.2.0

[klizhentas]

@knisbet @r0mant can you please take a look? seems important

[knisbet]

@zimmski Thank you for the report, we'll take a look at ensuring these checks only run on the relevant kernels.

As a workaround, you can use GRAVITY_CHECKS_OFF=true as an environment variable to the install and join commands, that will skip any pre-flight check failures.

[zimmski]

Thanks for the changes. We try to run Gravity on openSUSE MicroOS and #745 is basically the next issue we ran into. However, this changes works as intended.

[zimmski]

Sorry for closing the issue, I just saw that the change is still not upstreamed.