otzoran

What is git index?

see explanation

git add -p

-p, --patch
Interactively choose hunks of patch between the index and the work tree and add them to the index. This gives
the user a chance to review the difference before adding modified contents to the index.

The git index goes by many names.

otzoran

apt-get install build-essential module-assistant
m-a prepare

otzoran

Problem

During VM boot we see an error from piix4_smbus and in dmesg something like:

piix4_smbus 0000:00:07.3: Host SMBus controller not enabled!

This error is caused by VM having no smbus but Ubuntu always trying to load the module. It doesn’t affect anything but is a bit annoying. Originally this error was reported on VirtualBox and Ubuntu 10.10, but I still see it in Ubuntu 13.10. It also exist on VMware Fusion.

otzoran

#!/bin/bash
set -ex

[[ $(id -u) == 0 ]]   || { echo "Buddy needs to be root to run this"; exit 1; }
[[ $PWD == "/root" ]] || { echo "Run this from /root"; exit 1; }

# 1. Download key

wget -q -O google_signing_key.pub https://dl-ssl.google.com/linux/linux_signing_key.pub
apt-key add google_signing_key.pub

otzoran

#!/usr/bin/env bash

# Author: Ori Tzoran, based on idea and gist by aaronzirbes (see evolution below)
# Tested on Mac OS X 10.10.2 (14C109) 

set -e
## verify root runs this
[[ $(id -u) == 0 ]] || { echo need root; exit 1; }

#set -vx

otzoran

NTP Server Israel

source: isoc-il

timeserver.iix.net.il   # 192.114.62.250 stratum-2

otzoran

The old way

if tty -s; then
  echo "interactive"
fi

Cons

This method does the job, but invloves process invocation (fork/exec) of tty, which is expensive in terms of performance.
But there's a worse side-effect:
If PATH is empty or wrong, calling tty will fail. When sourced for a login shell,

otzoran

# vim: set filetype=sh :

# Purpose
# set environment variables for EC2_URL EC2_HOME JAVA_HOME CLASSPATH
# required by ec2-api-tools, used by other tools (e.g. vagrant)

# Usage: 
# source this
# create local env.monsoon in a project's subdir defining:
# export AWS_PROJECT="MOCONS / rmjen"

otzoran

Installing Guest Additions on Debian

Follow these steps to install the Guest Additions on your Debian virtual machine:

sudo -i
apt-get update && apt-get upgrade
apt-get install build-essential module-assistant
# Configure your system for building kernel modules by running:
m-a prepare

otzoran

The proc is explained here