Chintalagiri Shashank chintal

VirtualGL

When you use ssh with X forwarding, you might have noticed that you cannot execute programs that require 3D acceleration. That's where VirtualGL comes into play.

#A small guide to compile openFrameworks armv7 with driver OpenGL ES / ES2 sunxi for H3 / Mali GPU on ARMBIAN OS, compatible with orangepi and bananapi.

tested on: orangepi one banana pi M2

dependencies:

apt-get install libx11-dev libxext-dev xutils-dev libdrm-dev \ 
           x11proto-xf86dri-dev libxfixes-dev x11proto-dri2-dev xserver-xorg-dev \
 build-essential automake pkg-config libtool ca-certificates git cmake subversion

Remove unused packages on Raspberry Pi

(this is worth looking at http://www.stefan-seelmann.de/wiki/rasperrypi-homeserver, which is basically this:

apt-get purge --auto-remove scratch debian-reference-en dillo idle3 python3-tk idle python-pygame python-tk lightdm gnome-themes-standard gnome-icon-theme raspberrypi-artwork gvfs-backends gvfs-fuse desktop-base lxpolkit netsurf-gtk zenity xdg-utils mupdf gtk2-engines alsa-utils  lxde lxtask menu-xdg gksu midori xserver-xorg xinit xserver-xorg-video-fbdev libraspberrypi-dev libraspberrypi-doc dbus-x11 libx11-6 libx11-data libx11-xcb1 x11-common x11-utils lxde-icon-theme gconf-service gconf2-common

)

Warning: this will probably break something. If you need sound, don't remove the "alsa" packages

sudo apt-get --yes purge xserver-common x11-xfs-utils x11-xserver-utils xinit libsmbclient blt gvfs gvfs-backends gvfs-daemons gvfs-fuse idle idle-python2.7 idle-python3.2 idle3 libaudio2 libice6 liblightdm-gobject-1-0 libobrender27 libpulse0 libqt4-svg libqt

How to extract a single file with its history from a git repository

These steps show two less common interactions with git to extract a single file which is inside a subfolder from a git repository. These steps essentially reduce the repository to just the desired files and should performed on a copy of the original repository (1.).

First the repository is reduced to just the subfolder containing the files in question using git filter-branch --subdirectory-filter (2.) which is a useful step by itself if just a subfolder needs to be extracted. This step moves the desired files to the top level of the repository.

Finally all remaining files are listed using git ls, the files to keep are removed from that using grep -v and the resulting list is passed to git rm which is invoked by git filter-branch --index-filter (3.). A bit convoluted but it does the trick.

	######################################
	# target
	######################################
	TARGET = Project

	######################################
	# building variables
	######################################
	# debug build?
	DEBUG = 1

	# from: https://doc.qt.io/qt-5/qtcharts-nesteddonuts-example.html
	import functools
	import random

	from PyQt5.QtChart import *
	from PyQt5.QtGui import *
	from PyQt5.QtCore import *
	from PyQt5.QtWidgets import *

	class Widget(QWidget):

	#!/usr/bin/env python

	from twisted.internet import defer, reactor
	from twisted.internet.protocol import Protocol
	from twisted.web.client import Agent
	from twisted.web.http_headers import Headers


	def run():
	# create some requests for parallel execution

	from twisted.internet import defer, reactor
	from twisted.web.client import getPage

	def listCallback(results):
	print results

	def finish(ign):
	reactor.stop()

	def test():

	#!/usr/bin/env python
	import os
	import shlex
	import struct
	import platform
	import subprocess


	def get_terminal_size():
	""" getTerminalSize()

Chintalagiri Shashank chintal

VirtualGL

Remove unused packages on Raspberry Pi

How to extract a single file with its history from a git repository

1. copy the repository to extract the file from and go to the desired branch