Meanwhile, in GSoC:

I took the second week of Community Bonding to make some improvements in my development environment. As I have reported before, I use a QEMU VM to develop kernel contributions. I was initially using an Arch VM for development; however, at the beginning of the year, I reconfigured it to use a Debian VM, since my host is a Debian installation - fewer context changes. In this movement, some ends were loose, and I did some workarounds, well… better round it off.

I also use kworkflow (KW) to ease most of the no-coding tasks included in the day-to-day coding for Linux kernel. The KW automates repetitive steps of a developer’s life, such as compiling and installing my kernel modifications; finding information to format and send patches correctly; mounting or remotely accessing a VM, etc. During the time that preceded the GSoC project submission, I noticed that the feature of installing a kernel inside the VM was incompleted. At that time, I started to use the “remote” option as palliative. Therefore, I spent the last days learning more features and how to hack the kworkflow to improve my development environment (and send it back to the kw project).

I have started by sending a minor fix on alert message:

kw: small issue on u/mount alert message

Then I expanded the feature “explore” - looking for a string in directory contents - by adding GNU grep utility in addition to the already used git grep. I gathered many helpful suggestions for this patch, and I applied them together with the reviews received in a new version:

src: add grep utility to explore feature

Finally, after many hours of searching, reading and learning a little about guestfish, grub, initramfs-tools and bash, I could create the first proposal of code changes that enable kw to automate the build and install of a kernel in VM:

add support for deployment in a debian-VM

The main barrier to this feature was figuring out how to update the grub on the VM without running the update-grub command via ssh access. First, I thought about adding a custom file with a new entry to boot. Thinking and researching a little more, I realized that guestfish could solve the problem and, following this logic, I found a blog post describing how to run “update-grub” with guestfish. From that, I made some adaptations that created the solution.

However, in addition to updating grub, the feature still lacks some steps to install the kernel on the VM properly. I checked the missing code by visiting an old FLUSP tutorial that describes the step-by-step of compiling and install the Linux Kernel inside a VM. I also used the implementation of the “remote” mode of the “kw deploy” to wrap up.

Now I use kw to automatically compile and install a custom kernel on my development VM. So, time to sing: “Ooh, that’s why I’m easy; I’m easy as Sunday morning!”

Maybe not now. It’s time to learn more about IGT tests!