Tiptop Software Company

I’m always trying to remember how to clear cache with Docker

docker system prune -a

I don’t know how many times I get this error:

% helm push mychart2-0.1.0.tgz oci://localhost:15000/helm-charts
Error: failed to perform "Exists" on destination: Head "https://localhost:15000/v2/helm-charts/mychart2/manifests/sha256:2b7ac24bf87c62ed9a1ac6cd39e0c4be73de59fbd39f4d1d6823908201d76b33": http: server gave HTTP response to HTTPS client

I get stuck on the failed to perform "Exists" ignoring the more import reason server gave HTTP response to HTTPS client

The solution is to use the --plain-http option when running Zot or the likely locally.

Another thing I always forget, how to delete local and remote branches:

git branch | grep lint | while read branch
do
git branch -D $branch
git push -d origin $branch
done


I’m always forgetting the syntax to use a local development copy of a repository in the go.mod file:

replace oras.land/oras-go/v2 => /Users/billy/code/oras-go

This is so wrong

% rm -rf out/*
zsh: sure you want to delete all 4 files in /Users/tlhowe/code/oras/out [yn]? y

The solution

setopt localoptions rmstarsilent

Some sensors on the Raspberry work in uart mode over the serial port like the US-100 distance sensor. It isn’t hard to configure this with raspi-config, but I wanted to automate the configuration with Ansible. It tooks me a while, but I finally realized raspi-config is a shell script so I can look at what it is doing.

Looking at raspi-config I can see disabling the console serial capability and enabling serial capabilities on the GPI are not difficult:

---
- name: Disable serial console
  ansible.builtin.replace:
    path: /boot/cmdline.txt
    regexp: 'console=serial0,115200 '
    replace: ''
  become: yes

- name: Enable uart
  ansible.builtin.lineinfile:
    path: /boot/config.txt
    line: 'enable_uart=1'
  become: yes

Like most sensors, it takes a while to sort through all the different permutations of the way something can be done to find the way that actually works. The wiring, the software, the configuration all vary from one piece of hardware to the next. With the Pi Zero and the US-100 Y-401 distance sensor in UART mode, you wire the RX to the RX (pin 10/GPIO 15) and the TX to the TX (pin 8/GPIO 14). Use pin 17 for 3v power and pin 20 for ground.

You need to go into the raspi-config and disable the serial console, but keep serial data enabled and then reboot. You also need to enable i2c which can be done in the /boot/config.txt by uncommenting dtparam=i2c_arm=on.

import time
import adafruit_us100
import serial

uart = serial.Serial("/dev/ttyS0", baudrate=9600, timeout=3)
print(uart)
us100 = adafruit_us100.US100(uart)
while True:
    print("-----")
    print("Temperature: ", us100.temperature)
    print("Distance: ", us100.distance)
    time.sleep(0.5)

I’m often looking for the way to dump the variables available to ansible and I used to have a role just to do that, but sometimes a role is more than you need.  Sometimes just dumping them will do:

---
- hosts: localhost
  tasks:
      - debug:
          msg: "{{ vars | to_nice_json }}"

Every time I reboot, siri, maps, etc reappear on the dock and I have to remove them again.  Very annoying to have apps that I am not using keep showing up on the dock.  To permanently remove them from the dock, disable and enable system integrity protection:

sudo /usr/libexec/PlistBuddy -c "delete:add-app" \
 /System/Library/CoreServices/Dock.app/Contents/Resources/com.apple.dockfixup.plist
sudo /usr/libexec/PlistBuddy -c "delete:add-doc" \
 /System/Library/CoreServices/Dock.app/Contents/Resources/com.apple.dockfixup.plist