In a science fiction game I play, we often find ourselves asking “which side of the Sun is Mars from the Earth right now?” Since this is for a game, the exact distance is not important, just “same side” or “90 degrees ahead” is a sufficient answer. But “right now” actually means a couple hundred years in the future.
Perfect problem to write a little code to solve. Here’s what it looks like.
Continue readingGit Lab provides a mechanism to run workloads triggered by a git commit. We try to let the automation do as much work as possible before interrupting a human code reviewer. We want to know if the code is right in as objective a manner as possible before we take the expensive context switch to perform a code review.
Continue readingMy Day job has me messing around with QT5. We’rer building various RPMs for different RHEL and CentOS versions, and I wanted to get a little more experience on this. Specifically, I wanted to be able to do trial and error on a package that would not pollute our work stream. I wanted it to be something QT based. And I wanted it to be fun.
So I am working on repackaging QGo for Fedora 34 using QT5. Here’s what I am learning.
Continue readinggit archive --format=tar.gz -o ~/neptune3-ui-5.15.tar.gz 5.15 --prefix=neptune3-ui-5.15/ |
These are the options I needed. the -o says where to put the file, and the –prefix (with the / at the end) puts it in a subdir.
ALSA. Jack. PulseAudio. MIDI. Musescore. Jamulus.
My musical interactions with Linux are not the most complex in the world, but they ain’t trivial. The complexity of the Linux audio landscape has been a stumbling block so far. Pipewire has just gotten me past that.
The title of this article implies that you need to do something other than install Pipewire. So far, this is not true. On my system, at least, it Just works.
Continue readingWe are trying to enable the graphics hardware subsystem on the Raspberry Pi 4. This driver lives in mesa. The current Centos mesa.spec file does not enable the V3D Driver we need. Here are the steps I am going through to build the driver and integrate it into the meta-rpm build.
Continue readingThis is not a tutorial. These are my running notes from getting Cassandra to run on Fedora 32. The debugging steps are interesting in their own right. I’ll provide a summary at the end for any sane enough not to read through the rest.
My Lab machines do not have direct access to the internet. This mirrors how my customers tend to run their environments. Instead, I run a single bastion host that can connect to the internet, and use that to perform all operations on my lab machines.
While it is great to be able to use the Install media to add packlages to PXE booted systems, after some time, the set of packages available is older than you want. For example, I hit a bug that required an update of Network Manager. So, I want to make a local yum repo from my RHEL 8 subscription. RHEL 8 makes this fairly easy.
Continue readingM<y local PXE setup only puts the minimal set of RPMS on a machine. If want to install additional, I need to get access to the rest of the Repo. Here is what I did:
Continue readingMany years ago, when I first started working at Red Hat, I worked up a package management domain model diagram. I’ve referred to it many times over the years, but have never posted or explained it in detail. Recently, discussions over image building software caused me to refer to it a few times. Here it is, with annotations below.
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