Many fortnights ago, I foolishly thought writing a GTK3 theme from scratch would be easy. It was mostly CSS unlike GTK2. About 40 minutes in came a horrifying realization: there’s fundamentally (and definitively) no way to write a consistent theme that works reliably with every application. The minor upside was a working (and somewhat accessible) wireframe theme and a basic understanding of debugging. The end.

GTK_DEBUG=interactive firefox

An actual but where did my Linux memory go command;
This program (repositories) came in handy while helping someone resolve an oom problem. Want to see memory usage and shared memory, perhaps sorted by swap?

smem -s swap -kta
smem --sort swap --abbreviate --totals --autosize

swap     (amount of swap space consumed ignoring sharing)
command  (process command line)
maps     (total mappings count)
name     (process name)
pid      (process id #)
user     (process owner)
pss      (proportional set size including sharing)
rss      (resident set size ignoring sharing)
uss      (unique set size)
vss      (virtual set size; total virtual memory mapped)

df -h | grep tmpfs
df --human-readable | grep tmpfs

Incus is worth a look. It’s the fork of LXD, a container and vm orchestration/hypervisor program for cluster setups and infra models. Incus sits on top of the lower level LXC (Linux Containers).

• Incus Documentation: https://linuxcontainers.org/incus/docs/main/
• Incus Package Files: https://github.com/zabbly/incus#readme
• Incus Repository: https://github.com/lxc/incus#readme
• Incus Demo: https://linuxcontainers.org/incus/try-it/

Some nix language gotchas I’ve experienced while using NixOS personally:

1. Avoid with expressions unless with the inherit keyword for identifying hidden attributes in scope.
2. Avoid the rec keyword unless there’s tracking/control of infinite set recursion (self naming/references).
3. Avoid importing more than 1 instance of <nixpkgs> for any evaluation chain unless there’s magic compute and “infinite” memory.

Tricky is numero three, but crucial for fast feedback regardless of the current thing? I don’t poke around as much to know anymore but; legacy, flakes, community, and possibly others.