btfgen

btfgen enables running gadgets on system that don't provide BTF information. The ig image build command generates a new layer on the gadget image with the BTF information of the types used by the gadget for the most common kernels available in btfhub, this information is then used when running the gadget if the kernel doesn't have BTF enabled.

Enabling btfgen

Given that generating the BTF information for a gadget takes a while, this support is disabled by default.

The btfhub-archive repository needs to be present on the machine:

$ git clone --depth 1 https://github.com/aquasecurity/btfhub-archive/ $HOME/btfhub-archive/

Then, pass the --btfgen and the path of the btfhub-archive repository to the build command:

$ sudo ig image build . --btfgen --btfhub-archive $HOME/btfhub-archive -t myimage

The resulting image will contain the BTF information and can be pushed, run or tagged as any other gadget image.