Christian Franke cfra

## steps.md

      
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                cfra
                / steps.md
            
            
              Last active
              January 10, 2024 19:58
            
              
                Django Custom user Model migration path
              
          
    Steps to migrate existing Django app to new user model

This all refers to PostgreSQL, on other databases it will probably be different.


Create the new User model as an exact copy of django.contrib.auth.models.User (we assume it will be user.User then)


Create the migrations and commit them


Run the following SQL to simulate that the migration has run


SELECT * FROM django_migrations_id_seq;

  
## amp-calc.md

      
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                cfra
                / amp-calc.md
            
            
              Created
              December 6, 2022 17:14
            
              
                Musings about audio amplifiers and their gain/power aspects
              
          
    Amp Power calculations

Beispiel, t.amp TSA 4-700
Warnung, dieses Dokument dient aktuell dazu die Ueberlegungen niederzuschreiben um sie zu pruefen, es ist moeglicherweise nicht korrekt.
Datenblatt

https://images.static-thomann.de/pics/atg/atgdata/document/manual/218915_c_218915_325986_325988_v1_r1_de_online.pdf

  
## send-sms.py
#!/usr/bin/env python
#
#    DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
#                    Version 2, December 2004
#
# Copyright (C) 2004 Sam Hocevar 14 rue de Plaisance, 75014 Paris, France
# Everyone is permitted to copy and distribute verbatim or modified
# copies of this license document, and changing it is allowed as long
# as the name is changed.
#

## targeted-ddrescue.md

      
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                cfra
                / targeted-ddrescue.md
            
            
              Last active
              May 7, 2023 10:41
            
              
                How to use ddrescue to recover allocated areas or specific files from a filesystem on a failing disk
              
          
    Situation

We have a failing disk.
There is data on the disk that we would like to recover, if at all possible.
We can still access the disk using ddrescue, but it is really slow, when we just
try to dump the disk, estimated runtime is more than a year.
We are not actually interested in all the blocks of the disk: There are only specific

  
## passmenu-otp.diff
--- /usr/bin/passmenu	2021-06-12 18:06:38.000000000 +0200
+++ /usr/local/bin/mypassmenu	2021-07-22 11:19:24.138521764 +0200
@@ -28,6 +28,20 @@

 [[ -n $password ]] || exit

+if [[ ${password%-otp} != ${password} ]]; then
+	code_file="$prefix/2fa/$password/code.gpg"
+	[[ -e "$code_file" ]] || {
+		mkdir -p "$prefix/2fa/$password"

## modeltranslation_edithandler.py
from django.conf import settings
from django.db.models.fields import NOT_PROVIDED

from wagtail.admin.edit_handlers import FieldPanel, MultiFieldPanel


class TranslatedFieldPanel(MultiFieldPanel):
    """
    Allow editing of translated fields.

## har_hosts.py
#!/usr/bin/env python3
import json
import sys

try:
    file_path = sys.argv[1]
except IndexError:
    sys.stderr.write(f"Usage: {sys.argv[0]} <file_path>\n")
    sys.exit(1)

## async-network-reload.yml
---

- name: Reload networking (in-band)
  service:
    name: networking
    state: reloaded

- name: Reload networking (out-of-band)
  shell: ifreload --allow=mgmt
  async: 45

## workadventure.md

      
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                cfra
                / workadventure.md
            
            
              Last active
              January 24, 2021 21:19
            
              
                Extremely terse instructions for setting up Workadventure on Kubernetes
              
          
    Deploy workadventure with Kubernetes

Some slight adaptation of deeployer.libsonnet is necessary. My diff looks like this:
diff --git a/deeployer.libsonnet b/deeployer.libsonnet
index 8957194..357422d 100644
--- a/deeployer.libsonnet
+++ b/deeployer.libsonnet
@@ -1,9 +1,9 @@

  
## heroku-python-obscure-libs.md

      
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                cfra
                / heroku-python-obscure-libs.md
            
            
              Created
              September 16, 2020 09:39
            
          
    Using "obscure" libraries with the Heroku Python buildpack

For a project I required dm.xmlsec.binding on Heroku.
To build this package on Ubuntu, libxmlsec1-dev needs to be installed.
Okay, let's add heroku-buildpack-apt and the following Aptfile:
libxmlsec1-dev
	#!/usr/bin/env python
	#
	# DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
	# Version 2, December 2004
	#
	# Copyright (C) 2004 Sam Hocevar 14 rue de Plaisance, 75014 Paris, France
	# Everyone is permitted to copy and distribute verbatim or modified
	# copies of this license document, and changing it is allowed as long
	# as the name is changed.
	#
	--- /usr/bin/passmenu 2021-06-12 18:06:38.000000000 +0200
	+++ /usr/local/bin/mypassmenu 2021-07-22 11:19:24.138521764 +0200
	@@ -28,6 +28,20 @@

	[[ -n $password ]] \|\| exit

	+if [[ ${password%-otp} != ${password} ]]; then
	+ code_file="$prefix/2fa/$password/code.gpg"
	+ [[ -e "$code_file" ]] \|\| {
	+ mkdir -p "$prefix/2fa/$password"
	from django.conf import settings
	from django.db.models.fields import NOT_PROVIDED

	from wagtail.admin.edit_handlers import FieldPanel, MultiFieldPanel


	class TranslatedFieldPanel(MultiFieldPanel):
	"""
	Allow editing of translated fields.
	#!/usr/bin/env python3
	import json
	import sys

	try:
	file_path = sys.argv[1]
	except IndexError:
	sys.stderr.write(f"Usage: {sys.argv[0]} <file_path>\n")
	sys.exit(1)
	---

	- name: Reload networking (in-band)
	service:
	name: networking
	state: reloaded

	- name: Reload networking (out-of-band)
	shell: ifreload --allow=mgmt
	async: 45