geberl’s gists

geberl / inotify_watcher.sh

Last active November 29, 2019 11:36

Watch Envoy's config files and use the required mv command to trigger a reload

	#!/bin/bash

	# Install the inotify tools in Dockerfile:
	# RUN apt-get update && apt-get install -y inotify-tools

	# Then establish the watch in the Docker entrypoint.sh:
	# ./inotify_watcher.sh &

	inotifywait --monitor "/etc/envoy/k8s/" --event create --event modify --event moved_to \|
	while read path action file; do

geberl / file_path_build_vs_run.go

Created October 28, 2019 07:43

Reliably access a file that resides next to the code/binary, whether it's started via go run or go build

	package main

	import (
	"fmt"
	"os"

	log "github.com/sirupsen/logrus"
	)

	func main() {

geberl / get_flac_info.go

Last active November 2, 2019 21:20

Get metadata and stream info from a flac audio file

	package main

	import (
	"flag"
	"fmt"
	"log"
	"os"

	"github.com/mewkiz/flac"
	"github.com/mewkiz/flac/meta"

geberl / struct_method_pass_by_val_vs_ref.go

Created October 19, 2019 05:10

Using struct methods with "pass by value" vs "pass by reference"

	package main

	import (
	"fmt"
	)

	type file struct {
	Size int `json:"size"`
	Name string `json:"name"`
	Extension string `json:"extension"`

geberl / resize_big_images.sh

Created October 16, 2019 09:33

Use convert (from imagemagick) to resize big image files to 50% with and height

	#!/bin/sh

	# SETTINGS -----------------------
	IMAGE_BASE_DIR="/Users/guenther/Downloads/imagefiles"
	SIZE_LIMIT="2M" # or "500k"?
	RESIZE_PERCENTAGE="50"
	# --------------------------------

	find ${IMAGE_BASE_DIR} -type f -size +${SIZE_LIMIT} \| while read filepath; do
	echo "Resizing $filepath ..."

geberl / channel_global_vars_and_wait_group.go

Created October 9, 2019 09:02

Using a goroutine to fetch some data from a mock API periodically, and save the result to global variables using a global channel that is listened to in another goroutine

	package main

	import (
	"fmt"
	"sync"
	"time"
	)

	var messages chan string
	var currentConditions string

geberl / get_repository_infos.sh

Created September 4, 2019 11:15

Use git and some common unix tools to print info about a repository

	#!/bin/sh

	commitLong=`git describe --always --abbrev=0`
	echo "commitLong:" $commitLong

	commitShort=`git describe --always`
	echo "commitShort:" $commitShort

	commitDatetime=`git log -1 --date=iso --format=%cd`
	echo "commitDatetime:" $commitDatetime

geberl / ViewController.swift

Created August 16, 2019 15:35

Example of an iOS ViewController that does some REST API calls, in Swift

	//
	// ViewController.swift
	// RestApiCallExample
	//
	// Created by Günther Eberl on 16.08.19.
	// Copyright © 2019 Günther Eberl. All rights reserved.
	//

	import UIKit

geberl / docker_check_for_update_via_pull.py

Created April 30, 2019 06:56

	#! /usr/bin/python
	# -- coding: utf-8 --

	"""
	Documentation:
	- Docker Engine API: https://docs.docker.com/develop/sdk/
	- Docker SDK for Python: https://docker-py.readthedocs.io/en/stable/
	"""

	from dateutil import parser

geberl / docker_check_for_update_via_api.py

Last active April 30, 2019 06:54

	#! /usr/bin/python
	# -- coding: utf-8 --

	import datetime
	import json
	import logging
	import requests
	from urllib import urlencode
	from urllib2 import Request, urlopen
	from tzlocal import get_localzone

Günther Eberl geberl