Installing an xmonad Environment on NixOS

Posted by Craige McWhirter on

NixOS Coin by Craige McWhirter

Xmonad is a very fast, reliable and flexible window manager for Linux and other related operating systems. As I recently shifted from Debian + Propellor to NixOS + NixOps, I now needed to redefine my Xmonad requirements for the new platform.


  • Grab my xmonad.nix file and import it in your /etc/nixos/configuration.nix
  • You can also grab my related xmonad.hs, xmobarrc and session files to use the complete setup.

An Example

At the time of writing, I used the below xmonad.nix to install my requirements. My current version can be found here.

# Configuration for my xmonad desktop requirements

{ config, pkgs, ... }:


  services.xserver.enable = true;                        # Enable the X11 windowing system.
  services.xserver.layout = "us";                        # Set your preferred keyboard layout.
  services.xserver.desktopManager.default = "none";      # Unset the default desktop manager.
  services.xserver.windowManager = {                     # Open configuration for the window manager.
    xmonad.enable = true;                                # Enable xmonad.
    xmonad.enableContribAndExtras = true;                # Enable xmonad contrib and extras.
    xmonad.extraPackages = hpkgs: [                      # Open configuration for additional Haskell packages.
      hpkgs.xmonad-contrib                               # Install xmonad-contrib.
      hpkgs.xmonad-extras                                # Install xmonad-extras.
      hpkgs.xmonad                                       # Install xmonad itself.
    default = "xmonad";                                  # Set xmonad as the default window manager.

  services.xserver.desktopManager.xterm.enable = false;  # Disable NixOS default desktop manager.

  services.xserver.libinput.enable = true;               # Enable touchpad support.

  services.udisks2.enable = true;                        # Enable udisks2.
  services.devmon.enable = true;                         # Enable external device automounting.

  services.xserver.displayManager.sddm.enable = true;    # Enable the default NixOS display manager.
  services.xserver.desktopManager.plasma5.enable = true; # Enable KDE, the default NixOS desktop environment.

  # Install any additional fonts that I require to be used with xmonad
  fonts.fonts = with pkgs; [
    opensans-ttf             # Used in in my xmobar configuration

  # Install other packages that I require to be used with xmonad.
  environment.systemPackages = with pkgs; [
    dmenu                    # A menu for use with xmonad
    feh                      # A light-weight image viewer to set backgrounds
    haskellPackages.libmpd   # Shows MPD status in xmobar
    haskellPackages.xmobar   # A Minimalistic Text Based Status Bar
    libnotify                # Notification client for my Xmonad setup
    lxqt.lxqt-notificationd  # The notify daemon itself
    mpc_cli                  # CLI for MPD, called from xmonad
    scrot                    # CLI screen capture utility
    trayer                   # A system tray for use with xmonad
    xbrightness              # X11 brigthness and gamma software control
    xcompmgr                 # X composting manager
    xorg.xrandr              # CLI to X11 RandR extension
    xscreensaver             # My preferred screensaver
    xsettingsd               # A lightweight desktop settings server


This provides my xmonad environment with everything I need for xmonad to run as configured.

Secure Data in Public Configuration Management With Propellor

Posted by Craige McWhirter on

Steampunk propeller ring by Daniel Proulx


List fields and contexts:

$ propellor --list-fields

Set a field for a particular context:

$ propellor --set 'SshAuthorizedKeys "myuser"' yourServers < authKeys

Dump a field from a specific context:

$ propellor --dump 'SshAuthorizedKeys "myuser"' yourServers

An Example

When using Propellor for configuration management, you can utilise GPG encryption to encrypt data sets. This enables you to leverage public git repositories for your centralised configuration management needs.

To list existing fields, you can run:

$ propellor --list-fields

which will not only list existing fields but will helpfully also list fields that would be used if set:

Missing data that would be used if set:
Field                             Context          Used by
-----                             -------          -------
'Password "myuser"'               'yourDesktops'
'CryptPassword "myuser"'          'yourServers'
'PrivFile "/etc/mail/dkim.key"'   'mailServers'    your.mail.server

You can set these fields with input from either STDIN or files prepared earlier.

For example, if you have public SSH keys you wish to distribute, you can place then into a file then use that file to populate the fields of an appropriate context. The contents of an example authorized_keys, we'll call authKeys, may look like this:

ssh-ed25519 eetohm9doJ4ta2Joo~P2geetoh6aBah9efu4ta5ievoongah5feih2eY4fie9xa1ughi you@host1
ssh-ed25519 choi7moogh<i2Jie6uejoo6ANoMei;th2ahm^aiR(e5Gohgh5Du-oqu1roh6Mie4shie you@host2
ssh-ed25519 baewah%vooPho2Huofaicahnob=i^ph;o1Meod:eugohtiuGeecho2eiwi.a7cuJain6 you@host3

To add these keys to the appropriate users for the hosts of a particular context you could run:

$ propellor --set 'SshAuthorizedKeys "myuser"' yourServers < authKeys

To verify that the fields for this context have the correct data, you can dump it:

$ propellor --dump 'SshAuthorizedKeys "myuser"' yourServers
gpg: encrypted with 256-bit ECDH key, ID 5F4CEXB7GU3AHT1E, created 2019-03-08
      "My User <myuser@my.domain.tld>"
      ssh-ed25519 eetohm9doJ4ta2Joo~P2geetoh6aBah9efu4ta5ievoongah5feih2eY4fie9xa1ughi you@host1
      ssh-ed25519 choi7moogh<i2Jie6uejoo6ANoMei;th2ahm^aiR(e5Gohgh5Du-oqu1roh6Mie4shie you@host2
      ssh-ed25519 baewah%vooPho2Huofaicahnob=i^ph;o1Meod:eugohtiuGeecho2eiwi.a7cuJain6 you@host3

When you next spin Propellor for the desired hosts, those SSH public keys with be installed into the authorized_keys_ filefor the user myuser for hosts that belong to the allServers context.

Setting and Storing Passwords

One of the most obvious and practical uses of this feature is to set secure data that needs to be distributed, such as passwords or certificates. We'll use passwords for this example.

Create a hash of the password you wish to distribute:

$ mkpasswd -m sha-512 > /tmp/deleteme
$ cat /tmp/deleteme

Now that we have that file, we can use it as input for Propellor:

$ propellor --set 'CryptPassword "myuser"' yourServers < /tmp/deleteme
Enter private data on stdin; ctrl-D when done:
gpg: encrypted with 256-bit ECDH key, ID 5F4CEXB7GU3AHT1E, created 2019-03-08
      "My User <myuser@my.domain.tld>"
gpg: WARNING: standard input reopened
Private data set.

Tidy up:

$ rm /tmp/deletem

You're now ready to deploy that password for that user to those servers.

Propagating Native Plants

Posted by Craige McWhirter on

by Alec M. Blomberry & Betty Maloney

Propagating Australian Plants

I have over 1,000 Diospyrus Geminata (scaly ebony) seedlings growing in my shade house (in used toilet rolls). I'd collected the seeds from the (delicious) fruit in late 2017 (they appear to fruit based on rainfall - no fruit in 2018) and they're all still rather small.

All the literature stated that they were slow growing. I may have been more dismissive of this than I needed to be.

I'm growing these for landscape scale planting, it's going to be a while between gathering the seeds (mid 2017) and planting the trees (maybe mid 2019).

So I needed to look into other forms of propagation and either cutting or aerial layering appear to be the way to go, as I already have large numbers of of mature Diospyros Geminata on our property or nearby.

The catch being that I know nothing of either cutting or aerial layering and in particular I want to do this at a reasonable scale (ie: possibly thousands).

So this is where Propagating Australian Plants comes in.

Aerial Layering

It's a fairly dry and academic read, that feels like it may be more of an introductory guide for botanic students than a lay person such as myself.

Despite being last published in 1994 by a publisher that no longer exists and having a distinct antique feel to it, the information within is crisp and concise with clear and helpful illustrations.

Highly recommended if you're starting to propagate natives as I am.

Although I wish you luck picking up a copy - I got mine from an Op Shop. At least the National Library of Australia appears to have a copy.

New Dark Age: Technology and the End of the Future

Posted by Craige McWhirter on

by James Bridle

New Dark Age: Technology and the End of the Future

It may be my first book for 2019 but I'm going to put it out there, this is my must read book for 2109 already. Considering it was published in 2018 to broad acclaim, it may be a safe call.

tl;dr; Read this book. It's well resourced, thoroughly referenced, well thought out with the compiled information and lines drawn potentially redrawing the way you see our industry and the world. If you're already across the issues, the hard facts will still cause you to draw breath.

I read this book in bursts over 4 weeks. Each chapter packing it's own informative punch. The narrative first grabbed my attention on page 4 where the weakness of learning to code alone was fleshed out.

"Computational thinking is predominant in the world today, driving the worst trends in our societies and interactions, and must be opposed by real systemic literacy." page 4

Where it is argued that systemic literacy is much more important than learning to code - with a humorous but fitting plumbing analogy in the mix.

One of the recurring threads in the book is the titular "Dark New Age", with points being drawn back to the various actions present in modern society that are actively reducing our knowledge.

"And so we find ourselves today connected to vast repositories of knowledge, and yet we have not learned to think. In fact, the opposite is true: that which was intended to enlighten the world in practice darkens it. The abundance of information and the plurality of world-views now accessible to us through the Internet are not producing a coherent consensus reality, but one riven by fundamentalist insistence on simplistic narratives, conspiracy theories, and post-factual politics." page 10

Also covered are more well known instances of corporate and government censorship, the traps of the modern convenience technologies.

"When an ebook is purchased from an online service, it remains the property of the seller, it's loan subject to revocation at any time - as happened when Amazon remotely deleted thousands of copies of 1984 and Animal Farm from customers' Kindles in 2009. Streaming music and video services filter the media available by legal jurisdiction and algorithmically determine 'personal' preferences. Academic journals determine access to knowledge by institutional affiliation and financial contribution as physical, open-access libraries close down." page 39

It was the "Climate" chapter that packed the biggest punch for me, as an issue I considered myself rather well across over the last 30 years, it turns out there was a significant factor I'd missed. A hint that surprise was coming came in an interesting diversion into clear air turbulence.

"An advisory circular on preventing turbulence-related injuries, published by the US Federal Aviation Administration in 2006, states that the frequency of turbulence accidents has increased steadily for more than a decade, from 0.3 accidents per million flights in 1989 to 1.7 in 2003." page 68

The reason for this increase was laid at the feet of increased CO2 levels in the atmosphere by Paul Williams of the National Centre for Atmospheric Science and the implications were expounded upon in his paper Nature Climate Change (2013) thusly:

" winter, most clear air turbulence measures show a 10-40 per cent increase in the median strength...40-70 per cent increase in the frequency of occurrence of moderate or greater turbulence." page 69

The real punch in the guts came on page 73, where I first came across the concept of "Peak Knowledge" and how the climate change was playing it's defining role in that decline, where President of the American Meteorological Society William B Gail wonders if:

"we have already passed through 'peak knowledge", just as we may have already passed 'peak oil'." page 73

Wondering what that claim was based on, the next few paragraphs of information can be summarised in the following points:

  • From 1000 - 1750 CE CO2 was at 275-285 parts / million.
  • 295ppm by the start of the 20th century
  • 310ppm by 1950
  • 325ppm in 1970
  • 350ppm in 1988
  • 375ppm by 2004
  • 400ppm by 2015 - the first time in 800,000 years
  • 1,000ppm is projected to be passed by the end of this century.

"At 1,000ppm, human cognitive ability drops by 21%" page 74

Then a couple of bombshells:

"CO2 already reaches 500ppm in industrial cities"

"indoors in poorly ventilated schools, homes and workplaces it can regularly exceed 1,000ppm - substantial numbers of schools in California and Texas measured in 2012 breached 2,000ppm."

The implications of this are fairly obvious.

All this is by the end of chapter 3. It's a gritty, honest look at where we're at and where going. It's not pretty but as the old saying goes, to be forewarned is to be forearmed.

Do yourself a favour, read it.

Installing NixOS on an ASUS EeePC 701

Posted by Craige McWhirter on

Those of you familiar with the ASUS EeePC 701 will be aware of it's limited memory (512M) and small internal drive (4G) which doesn't render it useless but does reduce it's modern usage.

I have two of these still in perfect working order and wanted to extend their functional lives. I have no need of any more routers and there are Raspberry Pi's everywhere here. I do have kids though and decided these would make great, ready made portable retro gaming consoles.

This blog post details how I installed NixOS and configured the 701's to overcome their short comings to extend their life.

At a Glance

  1. Download the latest NixOS minimal installer for 32-bit Intel/AMD.
  2. Boot off USB
  3. Set forcepae in Grub
  4. Connect networking
  5. Partition then format the SD card as / and the internal drive as swap
  6. Run the configuration builder
  7. Copy across nix files
  8. Install
  9. Enjoy

Process Detail

Have a copy of the NixOS manual handy. It will also be at [ALT]+[F8] once the installer has booted.


  1. Download the minimal installation CD, 32-bit Intel/AMD image and burn it to a USB stick.
  2. Insert the SD card and USB stick into the 701 (I used a spare 8G SD card I had handy).
  3. Power the 701 on and press [ESC], select the USB stick as the boot device,
  4. [TAB] at grub menu, append forcepae
  5. Continue the boot process until it reaches a root prompt
  6. If you have not connected Ethernet, connect to WiFi using wpa_supplicant, as per manual.

Partitioning and Formatting

With only a little deviation from section 2.2.2. Legacy Boot (MBR) we format the SD card to be the root disk and the internal drive as swap:

  • Create an MBR on the internal drive:

    # parted /dev/sda -- mklabel msdos

  • Create the root partition on the SD card:

    # parted /dev/sdc -- mkpart primary 1MiB 100%

  • Create the swap partition on the internal drive:

    # parted /dev/sda -- mkpart primary linux-swap 1MiB 100%

As per section 2.2.3 Formatting we now format the drives appropriately.

  • Format and label the / partition:

    # mkfs.ext4 -L nixos /dev/sdc1

  • Format the swap partion:

    # mkswap -L swap /dev/sda1

Installation and Configuration:

Now you can just continue to follow section 2.3 Installing and configure the system as you desire. I initially use a bare bones install and it can be read here. It's worth taking a brief look at if you're new to NixOS.

The section worth copying is related to how the kernel uses memory on this old i386 system:

  nixpkgs.config = {
    packageOverrides = pkgs: {
      stdenv = pkgs.stdenv // {
        platform = pkgs.stdenv.platform // {
          kernelExtraConfig = ''
            HIGHMEM64G? n  # 32-bit proc with > 4G RAM
            HIGHMEM4G y # 32-bit # proc # with # =< # 4G # RAM

Do not copy my import of retro-gaming.nix, that's a for after a successful install and a future blog post.

Once you've completed the install, the EeePC 701 ought to reboot into NixOS successfully.

Happy New Workbench

Posted by Craige McWhirter on

For the summer solstice I got a brand new second hand stainless steel bench top. Which by coincidence turns out to be the answer to the question "What do you get the man who has everything", apparently.

Brand new second hand stainless steel bench top

Turning to my cliché handbook, it turns out that when life gives you bench tops, you make workbenches. I needed a second standing desk for out on the deck and for hardware hacking, so under the watchful eye of a pair of local King Parrots I gathered some spare timber to cobble together a standing workbench for the bench top.

Stainless steel workbench upside down

Stainless steel workbench bare

Stainless steel workbench stage 1

There's a lot more work to be done on that desk but with stage 1 at least completed, it was time to install it on the deck, ready to hack 2019 away :-D

Stainless steel workbench in place

Yes, that is the Australian Sun reaching in, in the background to kill us all.

The astute amongst you will have also noticed the (empty) Lagavulin and Talisker bottles propping up my laptop so they're both physically and metaphorically supporting my work.

Looks like I've already put my hand up for some hacks on Termonad to be the first piece of work completed from the new deck desk, apart from this post of course :-D

So now that leaves me with an inside and an outside standing desk as well as a hammock to work from. Not sure what says about me, I'll leave that up to you.

Book Review: Fear: Trump in the White House

Posted by Craige McWhirter on

by Bob Woodward

Fear: Trump in the White House

If you suffer from anxiety about what's happening in the world and the competence of those in power, this is probably not the book for you. Bob Woodward's book shows in startling detail just how inadequate, incompetent and immature not only the President of the USA is but also most of the team that he had/has around him.

I didn't takes notes as I read this book and it really needs it. There's so much going on that its difficult to know where to begin. I can understand why Bob wrote this in a pretty much chronological fashion. There's one quote that stands out from Dowd, Trump's personal lawyer, the man that I came away with feeling had Trump's best interests at heart more than anyone else:

But in the man and his presidency Dowd had seen the tragic flaw. In the political back-and-forth, the evasions, the denials, the tweeting, the obscuring, crying "Fake News," the indignation, Trump had one overriding problem that Dowd knew but could not bring himself to say to the president:

"You're a fucking liar."

The primary feeling I was left with after reading this book was arrested development. This phrase best describes for me the behaviour of most of the people in involved in this tale. They just are not mature adults with a steady hand.

It's a phrase I've also come to associate with Australian politicians like Tony Abbott, Peter Dutton, Pauline Hanson, Clive Palmer... I'll stop there, it could be long list and there are not many Australian politicians that I could leave off that list sadly.

The kind of people who put their own narrow interests or the interests of their base or more importantly, donors, ahead of clear eyed long term national interests. The public rightly becomes disengaged with politics which leads to our politicians being drawn from an increasingly shallow pool of staffers and cronies, which leads to increased public disengagement, which further shrinks the pool from which our politicians are drawn.

It's a vicious loop that Wolfgang Streek expounds upon quite well in How Will Capitalism End? : Essays On A Failing System , a highly recommended read that looks deeply into and explains the socio-political problems of the modern era.

The secondary feeling I'm left with is just how broken "western" democracy truly is (I've argued at times that we do not actually live in a genuine democracy, just because we get to vote).

Clearly, in "western" nations across the world, politicians are not rising into power based on any form of merit or competency. More and more politicians in the USA, UK and Australia are coming into power despite their clearly displayed inadequacy, in spite of their arrested development, they are wielding power and being voted in by a jaded and disengaged public.

I've got no clear answer for you, only more questions.

Increasing broader community participation in politics is one, albeit unlikely solution (although the recent success of socialists in the US mid-terms show it can be done).

Another is to completely change the nature of our Democracy so that it functions as advertised but you first need to remove those in power with vested interests in the status quo.

So, this was a book review. Fantastic, insightful and frightening. Well worth a read.

Book Review: Frankenstein or The modern Prometheus (uncensored 1818 edition)

Posted by Craige McWhirter on

by Mary Wollstonecraft Shelley

Frankenstein or The modern Prometheus: The 1818 Text

This is a book I've had a steadfast disinterest in my entire life. Horror, old horror and a subject that has been covered ad nauseum in pop culture - it simply held no interest.

That was until I heard Radio National's The Science Show's special Frankenstein - It’s Alive!!! on the 1818 edition being re-released for the 200th anniversary of it's publication. That program shifted this book from "pulp fiction" to "must read" in my mind. This episode of The Science Show is worth a listen on it's own and is one of my favourite pod casts.

Yes, the first version is in 1818, and there were several more of that first edition, hardly altered at all. And then there's the edition in 1831 which she'd really seriously revised, and she'd really changed the impact of it.

... And really the changes that were made there were because some critics and some readers obviously were rather shocked by the science, the interest in the life issue. They thought the whole thing was dynamite really, they thought the public shouldn't really be given this plot and they shouldn't really be encouraged to think about it, so that each version of it is really a censored version of it after that. The novel gets rather more like the stage plays. She realised that that was the way critics anyway and the respectable classes wanted the plot to be interpreted.

This piqued my interest in the novel for the first time.

One of Mary's personal anxieties that Fiona mentions had been the loss of her first-born child, born prematurely and living for only a few days. She wrote in her journal:

Dreamt that my little baby came to life again, that it had only been cold and that we rubbed it before the fire and it lived.

and this added a personal connection for me between the author and the material. One of my favourite authors, Philip K. Dick described himself as a philosopher who used novels to explore his philosophies. I'd come to view this book in a similar light.

Thus armed, I convinced the local library of the importance of having this particular edition in their collection and waited patiently for it to arrive.

This edition proved to be a rewarding and surprising read. The antiquated story telling devices take a little getting used to, along with the spelling of many words and words that have dropped from modern usage in the 200 years since it was first published.

This original edition, as the podcast expounded upon, is nothing like what we've become accustomed to in modern pop culture but is a much more textured, thought provoking read. It may have been horror to an audience in 1818 but for me, the author is clearly exploring interesting philosophical question and that's where my attention was firmly fixed.

I highly recommend reading this original edition of this work. It's a surprisingly short, fast paced and thought provoking read.

I was mistaken to have avoided it for so long.

Configuring Solarized Colours in Termonad

Posted by Craige McWhirter on

I'm currently using Termonad as my terminal of choice. What is Termonad?

Termonad is a terminal emulator configurable in Haskell. It is extremely customizable and provides hooks to modify the default behavior. It can be thought of as the "XMonad" of terminal emulators.

As a long time Xmonad user, this is a rather appealing description as well as a fairly lofty and worthy goal. It's also a niche not currently filled, one that I'm pretty happy to see being filled. By default, Termonad looks like this.

Default Termonad palette

Which is pretty standard as far as terminal defaults go but a long way from the eye-soothing grace of the Solarized palette which I essentially won't work without.

The Solarized dark output looks like this (Haskell in vim):

Solarized (dark) Termonad palette

This is the function controlling the dark palette:

    solarizedDark1 :: Vec N8 (Colour Double)
    solarizedDark1 =
         sRGB24   0  43  54 -- base03, background
      :* sRGB24 220  50  47 -- red
      :* sRGB24 133 153   0 -- green
      :* sRGB24 181 137   0 -- yellow
      :* sRGB24  38 139 210 -- blue
      :* sRGB24 211  54 130 -- magenta
      :* sRGB24  42 161 152 -- cyan
      :* sRGB24 238 232 213 -- base2
      :* EmptyVec

    solarizedDark2 :: Vec N8 (Colour Double)
    solarizedDark2 =
         sRGB24   7  54  66 -- base02, background highlights
      :* sRGB24 203  75  22 -- orange
      :* sRGB24  88 110 117 -- base01, comments / secondary text
      :* sRGB24 131 148 150 -- base0, body text / default code / primary content
      :* sRGB24 147 161 161 -- base1, optional emphasised content
      :* sRGB24 108 113 196 -- violet
      :* sRGB24 101 123 131 -- base00
      :* sRGB24 253 246 227 -- base3
      :* EmptyVec

The Solarized light output looks like this (Haskell in vim):

Solarized (light) Termonad palette

This is the function controlling the light palette:

    solarizedLight1 :: Vec N8 (Colour Double)
    solarizedLight1 =
         sRGB24 238 232 213 -- base2, background highlights
      :* sRGB24 220  50  47 -- red
      :* sRGB24 133 153   0 -- green
      :* sRGB24 181 137   0 -- yellow
      :* sRGB24  38 139 210 -- blue
      :* sRGB24 211  54 130 -- magenta
      :* sRGB24  42 161 152 -- cyan
      :* sRGB24   7  54  66 -- base02
      :* EmptyVec

    solarizedLight2 :: Vec N8 (Colour Double)
    solarizedLight2 =
         sRGB24 253 246 227 -- base3, background
      :* sRGB24 203  75  22 -- orange
      :* sRGB24 147 161 161 -- base1, comments / secondary text
      :* sRGB24 101 123 131 -- base00, body text / default code / primary content
      :* sRGB24  88 110 117 -- base01, optional emphasised content
      :* sRGB24 108 113 196 -- violet
      :* sRGB24 131 148 150 -- base0
      :* sRGB24   0  43  54 -- base03
      :* EmptyVec

You can see how I've applied these options in this commit.

Update: My complete example is now included in the termonad examples.

Finding Bugs in an Aercus WS3083

Posted by Craige McWhirter on

Aercus WS3083

While we're not drought declared, there's been precious little rain over the last 6 months or so, which made it hard to work out if I really had a problem or not.

The rainfall had been light and infrequent while each time the weather station recorded 0mm rainfall, which didn't seem unreasonable but was dubious nonetheless.

All the sensors appeared to be working OK. I re-seated, reconnected and reset everything to make sure that the system was connected and working fine but with no change in the result.

I eventually was driven to digging out the manual gauge which recorded 18mm the next time it rained while the weather station recorded 0mm.

No choice this time but to get up the ladder and disassemble the rain gauge.

I removed the cover and everything passed an initial eye balling.

Aercus WS3083 rain gauge

The Aercus WS3083 uses a lever arm to measure and discard collected rain. Being a simple primate, I attempted toggled it with my index finger, instantly noted it wasn't moving freely before a massive grasshopper|cricket flew out from under the arm and into my face. It had made a nice home under the arm, preventing it from dipping down and counting rain.

Unsurprisingly it moved freely after that and has been accurately measuring rain since.

Postscript: I think the chickens are still upset at me for failing to catch the grasshopper|cricket and feed it to them.