Welcome to the site of solemnwarning (Daniel Collins), here you will find software and other debris I've published over the years.
Posted in programming on 27 May 2020 at 21:39 UTC
At the end of the last article (In September 2017 actually), I had a fully automated regression testing system for IPXWrapper. In September of 2019, after two years of not touching the system and doing a little work on IPXWrapper itself, I felt it was time to install Windows updates in the VM images... and that's where everything went wrong....
Posted in programming on 07 Oct 2019 at 18:48 UTC
The GNU Make
shell function executes a shell command, expanding to whatever it wrote to standard output. If the command fails, thats just fiiine - however much it did or didn't output is what you get.
command_output := $(shell command)
I use the shell function for (among other things) getting compiler flags necessary for using libraries (e.g. from
pkg-config), and Make's behaviour of ignoring these errors is rather annoying, since it can mask the actual error with pages of output before getting to a build command that actually fails. Sometimes it can even mess up the compiler flags to the point you (or at least I) spend ages hunting down a phantom problem that doesn't exist.
Weirdly, I couldn't find any good solution on the web, with a bit of experimentation I wound up developing the following macro:
# Wrapper around the $(shell) function that aborts the build if the command # exits with a nonzero status. shell-or-die = $\ $(eval sod_out := $(shell $(1); echo $$?))$\ $(if $(filter 0,$(lastword $(sod_out))),$\ $(wordlist 1, $(shell echo $$(($(words $(sod_out)) - 1))), $(sod_out)),$\ $(error $(1) exited with status $(lastword $(sod_out)))) WX_CXXFLAGS := $(call shell-or-die,wx-config --cxxflags base core aui propgrid adv) WX_LIBS := $(call shell-or-die,wx-config --libs base core aui propgrid adv)
If you don't mind depending on GNU Make 4.2 (a bit too new for my tastes), if can be simplified to:
shell-or-die = $\ $(eval sod_out := $(shell $(1)))$\ $(if $(filter 0,$(.SHELLSTATUS)),$\ $(sod_out),$\ $(error $(1) exited with status $(.SHELLSTATUS)))
Posted in Linux on 28 Mar 2019 at 18:49 UTC
The CI pipeline for one of my projects generates coverage reports as a collection of HTML files, which are published on one of my web servers. Each report is only ~8MB, but that starts to add up pretty quickly after a few dozen commits, so I wanted to compress the reports on disk and have them decompressed as needed rather than using up my precious disk space.
Strangely, this doesn't seem to be a widely-used (or at least well-documented) Apache configuration. All references I found were out of date or didn't do what I wanted.
So here's how I got it working...
Posted in programming on 06 Mar 2018 at 21:39 UTC
In 2014 I wrote a fairly comprehensive test suite for IPXWrapper, which tests it end-to-end, from the APIs through to the network traffic they generate and process. It depends on a meticulously configured set of Windows and Linux machines, which I had duplicated using several different versions of Windows.
Eventually bit-rot set in and some of the Windows VMs became unusable for quick testing; sat installing updates whenever I booted them, broke themselves in odd ways, etc. Also my workstation doesn't have enough RAM for Chrome and several Windows VMs at the same time. No machine does....