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Setup armv7h chroot under x86_64 host (Archlinux/Archlinuxarm biased)

Simple way to setup an arm chroot for building packages for your arm devices. This is an alternative to cross-compiling where you are limited to only linking against the libs in your toolchain.

Setup chroot-fs

You can store the chroot wherever you like. I choose to store it in a disk-image which I mount to my filesystem.

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umount: device is busy. Why?
There are several reasons why a file system cannot be unmounted. Here are a few of the reasons.

Working directory or file open of a running process

# umount /mnt/test
umount: /mnt/test: device is busy.
        (In some cases useful info about processes that use
         the device is found by lsof(8) or fuser(1))
# lsof /mnt/test/

tinti

package main

import (
	"fmt"
	"io"
	"io/ioutil"
	"log"

	"code.google.com/p/go.crypto/ssh"
	"code.google.com/p/go.crypto/ssh/terminal"

tinti

# encoding: utf-8

require "timeout"

# Capture the standard output and the standard error of a command.
# Almost same as Open3.capture3 method except for timeout handling and return value.
# See Open3.capture3.
#
#   result = capture3_with_timeout([env,] cmd... [, opts])
#

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See this post on the ArchLinux forum ArchLinux >> Newbie Corner >> Top is red

remove your ~/.toprc (if any)

• start "top"
• press z
• press V
• press 1
• press y
• press m m

tinti

package main

import (
	"crypto/aes"
	"crypto/cipher"
	"crypto/rand"
	"encoding/base64"
	"fmt"
	"io"
)

tinti

Generate private key (.key)

# Key considerations for algorithm "RSA" ≥ 2048-bit
openssl genrsa -out server.key 2048

# Key considerations for algorithm "ECDSA" ≥ secp384r1
# List ECDSA the supported curves (openssl ecparam -list_curves)
openssl ecparam -genkey -name secp384r1 -out server.key

tinti

#!/usr/bin/expect -f
set timeout 60
set host [lindex $argv 0]

stty -echo
send_user -- "Password for $host: "
expect_user -re "(.*)\n"
send_user "\n"
stty echo
set password $expect_out(1,string)

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Intro

TCL-Expect scripts are an amazingly easy way to script out laborious tasks in the shell when you need to be interactive with the console. Think of them as a "macro" or way to programmaticly step through a process you would run by hand. They are similar to shell scripts but utilize the .tcl extension and a different #! call.

Setup Your Script

The first step, similar to writing a bash script, is to tell the script what it's executing under. For expect we use the following:

#!/usr/bin/expect

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# Released by rdb under the Unlicense (unlicense.org)
# Based on information from:
# https://www.kernel.org/doc/Documentation/input/joystick-api.txt

import os, struct, array
from fcntl import ioctl

# Iterate over the joystick devices.
print('Available devices:')