dnos-kdev: Kernel tool for dnos

This tools installs and runs kernel development packages for a specific distro version inside a docker container. This allows using tools requiring exact binary compatibility.

The installed packages include compilers, kernel images, debug symbols, kpatch-build and systemtap.

Options:

-h, --help	Show this message
-n, --dry-run	Just print what would be done
-r, --ssh-remote HOST
	SSH destination (dnos port 2222)
-s, --sourcedir SRC
	Kernel source dir (only for kpatch)
--use-linux-source-package
	Set --sourcedir to unpacked source in /usr/src/
--extra-args-docker ARGS
	Extra arguments for docker run
--extra-args-stap ARGS
	Extra arguments for stap
--extra-args-staprun ARGS
	Extra arguments for staprun
--extra-args-stapmod ARGS
	Extra arguments for stap module
--use-ubuntu-stap
	Use ubuntu /usr/bin/stap inside docker
--use-upstream-stap
	Use upstream /usr/local/bin/stap inside docker. This requires updated staprun on remote target
-u, --match-uidgid
	Match current uid/gid
--focal	Use ubuntu focal 20.04 (default)
--bionic	Use ubuntu focal 18.04

Subcommands:

run

Run shell command inside the container (default is interactive shell)

stap

Run stap in container with correct -r argument

remote-staprun

Build stap.ko inside container and run on --ssh-remote

kpatch-build

Run kpatch-build inside the container

prepare-source

Prepare kernel given via --sourcedir

Default is to run an interactive shell inside the container.

Subcommands will automatically receive "correct" arguments to reference the target kernel so stap is equivalent to run stap -r $kver.

The current working directory is mounted inside the docker container (at /mnt/cwd) so path references under ./ usually work but not externally.

Building kpatch modules:

If using kernel source from git it needs to patch precisely, example for focal:

• Remote is git://kernel.ubuntu.com/ubuntu/ubuntu-focal.git
• Tag is Ubuntu-5.4.0-73.82

Some stuff are not inside ubuntu's linux git, they can be copied from linux-source inside the container. This can be done by prepare-source.

Example:

dnos-kdev -s . prepare-source
dnos-kdev -s . kpatch-build -t vmlinux some.diff

The kernel source should be unpatched, all changes should be in the diff file.