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a damn fine cup of coffee

Andreas Linz klingtnet

a damn fine cup of coffee
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klingtnet /
Created Feb 2, 2020
Add SSH keys automatically to SSH-Agent

With the Mate desktop environment I faced the problem that SSH keys were not added automatically to my SSH-Agent/Keyring. This worked perfectly with XFCE, though. I just discovered that my ~/.ssh/config did not contain AddKeysToAgent (see man 5 ssh_config for options). After adding AddKeysToAgent=ask the keys are now added as expected.

klingtnet / gist:4148a55e374bdf7bfe160ed0dcdd5677
Created Jan 29, 2020
Hot to share a git repository by mail
View gist:4148a55e374bdf7bfe160ed0dcdd5677
1. `$ git bundle create my-project.bundle --all`
2. send the `my-project.bundle` by mail
3. on the receiver side: `git clone /path/to/my-project.bundle`

Viewsonic VG2755-2k

A 27" WQHD business IPS display: specs.

Often customers report problems about humming or buzzing noises caused by badly designed power supplies when a device is connected and charged via USB-C to a display. One very bad example of this is the Lenovo ThinkVision P27h-10, but also devices from Dell and Philips seem to be noisy when USB-C charging is active. I owned one of the P27h-10 for a short time and the noise was unbearable so I returned the display to the seller. Except that the monitor was very good, sturdy built, crisp and very bright diplay. Nonetheless, I wanted to have a display where I can connect my X1 through a single cable.

The Viewsonic VG2755-2k works fine when connected via USB-C, it can provide up to 60W charging power (15W more than the Lenovo) and makes absolutely no noise.

klingtnet / daemon.json
Created Jan 9, 2020
My docker daemon.json (fixes address ranges for docker-compose, etc. and logs using journald instead of files).
View daemon.json
"log-driver": "journald",
"default-address-pools": [
"base": "",
"size": 24
klingtnet /
Last active Jan 14, 2020
XFCE4.14 properly switch scaling factor
# 2 times scaling
$ xfconf-query --channel xsettings --property /Gdk/WindowScalingFactor --set 2 && xfconf-query --channel xfwm4 --property /general/theme --set Default-xhdpi && xfconf-query --channel xsettings --property /Gtk/CursorThemeSize --set 48 && xfce4-panel -r
# normal scaling
$ xfconf-query --channel xsettings --property /Gdk/WindowScalingFactor --set 1 && xfconf-query --channel xfwm4 --property /general/theme --set Default && xfconf-query --channel xsettings --property /Gtk/CursorThemeSize --set 16 && xfce4-panel -r
View gist:e91591956a3d0e89774a02a8ba9ef950
$ script --timing=typescript.timings
# spawns a new shell, do something etc.
# until EOF
$ scriptreplay typescript.timings
# replays the script
klingtnet /
Created Nov 6, 2019
Use a file as blockdevice (experiment with filesystem options)
dd if=/dev/zero of=/tmp/blockdevicefile bs=1M count=2K oflag=sync status=progress
mkfs.ext4 /tmp/blockdevicefile
mkdir /tmp/mountpath && sudo mount -o loop /tmp/blockdevicefile /tmp/mountpath
klingtnet /
Created Nov 3, 2019
Go installation script for Linux
set -eo pipefail
set -u
rm -rf /usr/local/go
curl -Lsf "${_version}.linux-amd64.tar.gz" | tar -C/usr/local -xvzf-
cat <<HEREDOC>/etc/profile.d/
export PATH=$PATH:/usr/local/go/bin
klingtnet /
Created Oct 28, 2019
Send emails with Python using SMTP over TLS
import smtplib
import os
from email.message import EmailMessage
with smtplib.SMTP_SSL('mailserver.example', port=465) as smtp:
smtp.login('my-user', 'my-secret-password')
from_addr = 'my-user@mailserver.example'
to_addr = ''
msg = EmailMessage()
import unittest
import itertools
from typing import List
def flatten(f):
def wrapper(*args, **kwargs):
nested = f(*args, **kwargs)
return list(itertools.chain(*nested))
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