velenux’s gists

velenux / prepare_images.sh

Last active November 9, 2018 00:54

Create a 1080p and a 2160p images from a starting image and apply a watermark

	#!/bin/bash

	# iterates over all the .jpg files in a directory
	# * creates a 1080p version with a 50% transparent signature (if not already present)
	# * creates a 2160p version with a 8% transparent signature (if not already present)

	FILE_sign_1080=signature_1080.png
	FILE_sign_2160=signature_2160.png

velenux / ethinfo.sh

Created April 27, 2018 11:02

print the relevant hardware information about the network interfaces

	#!/bin/bash

	# show all the relevant hardware information from network interfaces

	for DEV in /sys/class/net/* ; do
	dev_name=$(basename "${DEV}")
	echo "# $dev_name ========================================="
	hardware_path=$(udevadm info --query=path --path=${DEV} 2>&1)
	if [ -z "$hardware_path" ]; then
	echo "Could not find the hardware path, skipping."

velenux / extract_timeline_appearance.py

Created March 31, 2018 01:05

elezioni.tracking.exposed data timeline viz

	# encoding: utf-8

	import json
	import pprint
	import codecs
	import iso8601
	import datetime

	# this is the json from https://elezioni.tracking.exposed/campaign/opendata/
	filename = 'archive.json'

velenux / download_crmsh.sh

Created March 15, 2018 16:39

download crmsh packages

	#!/bin/bash

	# for some reason, this repo is having problems with yum

	base_url="https://download.opensuse.org/repositories/network:/ha-clustering:/Stable/CentOS_CentOS-7/noarch/"

	file_tmp=$(mktemp)

	/usr/bin/curl -sS -Lo "$file_tmp" "$base_url"
	if [ "x$?" != "x0" ]; then

velenux / rails-puma.service

Created June 3, 2015 22:38

systemd service to start rails/puma

	# based on https://gist.github.com/twtw/5494223
	# create systemd service file for rails/puma startup
	# 0. [if required: rvm use ruby@default]
	# 1. rvm wrapper default systemd rails
	# 2. put this file in /etc/systemd/system/rails-puma.service
	# 3. systemctl enable rails-puma
	# 4. systemctl start rails-puma
	[Unit]
	Description=Rails-Puma Webserver

velenux / corosync.conf

Created April 29, 2015 15:32

Configuration for Corosync 2.x + Pacemaker 1.1 2-node cluster on Ubuntu 14.04 LTS

	# Please read the corosync.conf.5 manual page
	compatibility: whitetank

	totem {
	# cluster name
	cluster_name: coro01

	# totem parameters
	version: 2
	secauth: off

velenux / visual_hash.sh

Last active May 22, 2017 09:04

Quickly create a visual representation of a hash checksum in bash using Unicode color-coded characters

	#!/bin/bash

	# outputs a visual hash for the system is running on:
	# useful to identify which system you are running your commands on

	# first two bytes for the unicode sequence, by default we use 28
	# since the braille character set is fully compliant and easy to identify
	# the characters will be: u+${BASE_UNICODE}${first_hex}${second_hex}
	# good values are: 14, 22, 25, 28, 2F, 34, A5, FB, 106, 131
	BASE_UNICODE=14

velenux / recursive_dir_md5.py

Created July 23, 2014 19:51

Recursively calculate a "directory md5sum" based on it's content filename, size and mtime

	import os
	import hashlib

	# calc directory checksum
	def calc_dir_sum(path):
	for root, dirs, files in os.walk(path):
	dir_hash = hashlib.md5()

	# calc checksum for each file
	# based on file name, size and mtime

velenux / opencl-headers.sh

Created February 11, 2012 21:01

Download OpenCL headers

	#!/bin/bash

	# based on http://www.streamcomputing.eu/blog/2011-06-24/install-opencl-on-debianubuntu-orderly/

	DIR=/usr/include/

	for VERSION in 1.1 1.2; do
	echo "Downloading headers for version ${VERSION}..."

	mkdir -p "${DIR}/CL-${VERSION}"

velenux / xpath_factory.rb

Created May 17, 2011 16:51

Select a link via XPath by it's content and container class

	# encoding: utf-8

	# using XPath 1.0, ref: http://www.exampledepot.com/egs/org.w3c.dom/xpath_GetElemByText.html

	class XPathFactory
	# build a XPath to find any link with content "content" inside a
	# container with class "class_name"
	def by_container_class_and_link_content(class_name, content)
	"//*[@class and contains(concat(' ',normalize-space(@class),' ')," +
	"' #{class_name} ')]//a[contains(translate(.,'abcdefghijklmnopqrstuvwxyz'," +

Gilberto Ficara velenux