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1. Bash tricks

   Contents

   • Scripts
   • Signals

   Scripts

   Use this at the top of all your Bash scripts to avoid problems:

   # Exit on error.
   set -e
   # Don't allow undefined variable.
   set -u
   # Make pipeline fail if any command in it fail.
   set -o pipefail
   

   Signals

   See this article.

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2. Heroku tips

   Use an editor

   By default there is no editor on Heroku. To get one, you can use the heroku-nano plugin like this (or by installing as a plugin):

   mkdir bin
   cd bin
   curl https://github.com/Ehryk/heroku-nano/raw/master/heroku-nano-2.5.1/nano.tar.gz --location --silent > nano.tar …

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3. Python tricks

   Contents

   • Inspect TLS certificates with requests

   Inspect TLS certificates with requests

   Use the snippet below to capture and inspect the certificates of a distant site and its chain with requests.

   import requests
   
   HTTPResponse = requests.packages.urllib3.response.HTTPResponse
   orig_HTTPResponse__init__ = HTTPResponse.__init__
   def new_HTTPResponse__init__(self, *args, **kwargs):
       orig_HTTPResponse__init__(self, *args, **kwargs …

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4. Use dnsmasq with NetworkManager

   This will, for instance, allow you to redirect all matching domains to a certain server: dnsmasq will intercept the DNS query and return the ip you specified.

   To do this, edit NetworkManager configuration in /etc/NetworkManager/NetworkManager.conf and add in the main section dns=dnsmasq:

   [main]
   dns=dnsmasq
   

   You …

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5. VSCode tips

   Contents

   • Python
     • venv

   Python

   venv

   To use a venv with VSCode, add in the folder settings:

   {
       "python.pythonPath": "~/.virtualenvs/bureauxlocaux--Uxk5jFn/bin/python",
       "python.unitTest.pyTestEnabled": true
   }
   

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6. Deploy your source maps to Rollbar with Ansible

   I recently had to integrate Rollbar (a service to track errors) with a JS application. One nice thing about Rollbar is that if you provide it with source maps, it will point to you where the error is in the original unminified code.

   Since the application is deployed with Ansible …

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7. Timeout a function in python

   You can use signals and a context manager to acheive this. The idea is to register a function that will raise an exeption when the alarm signal is received and schedule the alarm signal for the timeout.

   import signal
   from contextlib import contextmanager
   
   
   @contextmanager
   def timeout(time):
       # Register a function …

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8. Some tips for django

   Contents

   • Migrations
   • Model proxies
   • Easily increment migrations numbers
   • Create a widget with custom display
   • Use a nginx reverse proxy in dev

   Migrations

   You can use this check to verify your migrations during CI (no dependency issue and no creation):

   pipenv run make migrations
   if [[ $(git status --porcelain | grep migrations | wc …

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9. JavaScript tips

   Contents

   • Normalize an UTF-8 string

   Normalize an UTF-8 string

   Rely on String.prototype.normalize().

   const str = "Crème Brulée"
   str.normalize('NFD').replace(/[\u0300-\u036f]/g, "")
   > 'Creme Brulee'
   

   Source: https://stackoverflow.com/questions/990904/remove-accents-diacritics-in-a-string-in-javascript/37511463#37511463

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