CK's IT blog: 2016

Saturday, December 31, 2016

How to create bootable PIXEL USB stick for Mac

The Debian+PIXEL is for x86 platforms. The PIXEL ISO, which is a 1.3GB download.

The latest RASPBERRY PI DESKTOP image is DEBIAN STRETCH (add nomodeset in enterprise.cfg) https://downloads.raspberrypi.org/rpd_x86/images/rpd_x86-2017-12-01/2017-11-16-rpd-x86-stretch.iso

Reference : Fixing booting of the x86 image on Macs

Instructions to create EFI bootable USB stick for Mac. (tested working on my old MacBook Air 11-inch, Late 2010, Intel Core 2 Duo)

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Additional configurations or installation for PIXEL using Terminal

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EFI bootable USB stick for Ubuntu 16.10 Exton x64 platforms (PC or Mac)

exton-os-64bit-mate-refracta-1840mb-161231.iso (which is Ubuntu 16.10 for x64 platforms) can be downloaded from here https://sourceforge.net/projects/exton-os/ and copy to /Volumes/LINUX/efi/boot/ as boot.iso

or alternatively use the exton-os-light-64bit-isohybrid-970mb-161021.iso image from https://sourceforge.net/projects/exton-os/files/

The setup for this image for persistence in Mac is similar to the Debian PIXEL above
except the enterprise.cfg content should be

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Additional configuration and installation for Ubuntu 16.10 Exton x64 using Terminal

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If for Debian PIXEL-x86 and Ubuntu-16.10 Exton-x64 together in one USB stick with persistence

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Add the Original Ubuntu 16.04 from Ubuntu to the EFI bootable USB stick

For the Original ubuntu-16.04.1-desktop-amd64.iso image, add it by copying the downloaded iso image to the LINUX FAT32 partition and create the enterprise.cfg as below

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Additional configuration and installation for Ubuntu 16.04-1 using Terminal

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install Emscripten SDK for WebAssembly

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Sunday, November 13, 2016

How to build C++ static libraries (boost and QuantLib) for Android Studio

(1) Create standalone toolchain for Android in Mac

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(2) Download and build boost for Android

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(3) Create Android.mk at ~/Library/Android/sdk/ndk-bundle/sources/boost_1_62_0/ for ndkBuild in Android Studio

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(4) Download and build QuantLib for Android

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(5) Create Android.mk at ~/Library/Android/sdk/ndk-bundle/sources/QuantLib-1.9/ for ndkBuild in Android Studio

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(6) Demo of using boost c++ libraries for ndkBuild in Android Studio 2.2.2
Assume prebuilt libraries are installed to ~/Library/Android/sdk/ndk-bundle/sources

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(7) HelloJNI, sample of using cmake CMakeLists.txt after adding Boost and QuantLib libraries
Assume prebuilt libraries are installed to ~/Library/Android/sdk/ndk-bundle/sources

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(8) Download & Compile swig and generate java & c++ classes from QuantLib-SWIG-1.9 for Android project

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Sunday, September 18, 2016

CSS selector in Chrome using the example of Apple iPhone 7 Plus Availability Monitoring

The iPhone 7 Plus Reserve Page for HK is a dynamic web content as in https://reserve.cdn-apple.com/HK/en_HK/reserve/iPhone/availability

The basic javascript console code in Google Chrome for availability is as below

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There is an archive for iPhone 6 Availability script in last year, please click the Chrome CSS Javascript label below

Saturday, September 17, 2016

How to check something that "is not yet implemented" in Swift 3 Linux

How to grep "XXXX is not yet implemented" in Swift 3 Linux


cd $(HOME)
git clone --depth=1 https://github.com/apple/swift-corelibs-foundation

cd $(HOME)/swift-corelibs-foundation/Foundation

grep -r "NSUnimplemented() }"

How to grep func or init in Swift 3 Linux


cd $(HOME)/swift-corelibs-foundation/Foundation

grep -r "open func \|public init"

Wednesday, August 24, 2016

How to install Objective C 2.0 and GNUstep under Windows SubSystem for Linux - Bash Shell

Install Objective C 2.0 and GNUstep under Windows 10 bash shell
Follow the steps below (make sure the steps are followed in order, that is build libobjc2 before GNUstep) to install required packages and build scripts

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GNUstep documentation is here -> http://www.gnustep.org/developers/documentation.html

Wednesday, August 3, 2016

Bash Shell Built Into Windows 10 Anniversary Update 1607 Build 14393.10

After Windows 10 Anniversary Update, you have to enable "Developer mode" on the "Update & Security" page.
Then go to Control Panel -> Program and Features -> Turn Windows Features on or off -> Windows SubSystem for Linux (Beta), and click OK.

Bash Shell is only for 64-bit versions of Windows 10.

Bash Shortcut Keys
There are a number of very useful shortcut keys you can use in the bash shell:

Ctrl + U: Clears the line from the cursor point back to the beginning.
Ctrl + A: Moves the cursor to the beginning of the line.
Ctrl + E: Moves the cursor to the end of the line.
Ctrl + Left / Right: Moves the cursor to one word Left / Right.
Ctrl + R: Allows you to search through the previous commands.

Batch Rename Files
rename –v 's/foo/bar/g' *

Customize command line prompt

function prompt

{

local WHITE="\[\033[1;37m\]"

local GREEN="\[\033[0;32m\]"

local CYAN="\[\033[0;36m\]"

local GRAY="\[\033[0;37m\]"

local BLUE="\[\033[0;34m\]"

export PS1="${GREEN}\u${CYAN}@${BLUE}\h ${CYAN}\w${GRAY}$ "

}

prompt

where
\u refers to the current username
\h refers to the host name
\w refers to the current file path.

or simply uncomment the line force_color_prompt=yes in ~/.bashrc

You can use Docker for Windows as engine and docker client for linux in bash. "Docker for Windows" requires Windows 10 Pro 64-bit and Hyper-V Package.

To install docker client for Linux under bash shell
cd ~/
wget https://get.docker.com/builds/Linux/x86_64/docker-1.12.0.tgz
tar -xzvf docker-1.12.0.tgz
cd docker
./docker -H tcp://0.0.0.0:2375 ps

Or simply add the corresponding variables to ~/.bashrc
export DOCKER_HOST=tcp://0.0.0.0:2375
export PATH=$PATH:~/docker

To detach the docker tty without exiting the shell, use the escape sequence Ctrl-p + Ctrl-q

Install docker-compose and try docker-compose example as per https://docs.docker.com/compose/wordpress/

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Swift 3 on Ubuntu (14.04 LTS trusty) for Windows 10 bash shell

You need to download and extract the development snapshot (Ubuntu 14.04) from swift.org and do these under bash shell.

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Install node.js and mongo shell for Ubuntu

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File System Access

Ubuntu filesystem from Windows Explorer
C:\Users\%USERNAME%\AppData\Local\Lxss\rootfs
Ubuntu 16.04 filesystem from Windows Explorer, Fall Creators Update (2017 Oct)
C:\Users\%USERNAME%\AppData\Local\Packages\CanonicalGroupLimited.UbuntuonWindows_79rhkp1fndgsc\LocalState\rootfs\

Windows filesystem from Ubuntu bash
/mnt/c/
/mnt/d/

#edit ~/.bashrc
#add export LS_COLORS=$LS_COLORS:'di=1;44:' ; # dir white on blue background

To upgrade to Ubuntu 16.04 after Windows 10's Creators Update (2017 April)
open the Bash shell and run the following command:

sudo do-release-upgrade
lsb_release -a

However, lxrun /uninstall then lxrun /install is faster.

The lastest installtion of WSL is documented at https://docs.microsoft.com/en-us/windows/wsl/install-win10
where different and multiple distros can be installed via Microsoft Store since Fall Creators Update (2017 Oct).

Installation of Swift 3.1.1 in Ubuntu 16.04

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Installation of Swift 4 for Cygwin64

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Wednesday, June 22, 2016

How to build Node.js REST APIs in Raspberry Pi 3

This project is based on the "Build a REST API with node.js" video tutorial from Udemy

The project file can be downloaded here : https://mega.nz/#!z9oFlTgJ!geCPHjoXJ3rpm1OdldU8s5RBSJxLKiAxh_axvTbODB4

The node.js ARMv7 version is v4.4.3 and npm 2.15.1
which (ARMv7) can be downloaded from https://nodejs.org/en/download/
The project also use packages like bcryptjs, body-parser, express, jsonwebtoken and mongoose and integrate with mongodb. - No-SQL db.

To install mongodb in Raspberrry Pi, use sudo apt-get install mongodb

The following enhancements were made to the original project code

1. add shell scripts and use curl for API testing (test1.sh ... test6.sh), as POSTMAN is only available in google chrome
2. add js code to avoid creating of duplicated user (test using test2.sh)
3. add test to user login and obtain Authorization sessionToken (test using test3.sh)
4. add js code to check Authorization before CRUD (create, read, update and delete definition record)
5. add js code to check existence of definition id before update and delete record (test using test5.sh)
6. shell script to get sessionToken in each test for instruction to further test on update and delete definition (test using test5.sh)
7. add js code to create log when create, update and delete definition record (test using test4.sh / test5.sh and then test6.sh)

To use mongo to admin user
mongo
> use workouts
> db.addUser({ user: "test", pwd: "test", roles:["readWrite", "dbAdmin"]});

or use createUser as below
> db.createUser({ user: "test", pwd: "test", roles:["readWrite", "dbAdmin"]});

To use mongo to display mongodb info
mongo
> use workouts
> show collections
> db.users.find()
> db.definitions.find().pretty()
> db.logs.find().pretty()

To use mongo to remove object
> db.definitions.remove({_id:ObjectId("573c29c0f11288dc9997d0")})

Instructions to use
-----------------------
1. First install node.js and mongodb and check that if mongod is running successfully in background. (If you use windows / OSX version of mongodb, please make sure the required data path is created before running mongod.exe / mongod)
2. use mongo to create admin user as above
3. Download the project file and unzip and install packages and start

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Tuesday, June 21, 2016

How to run Docker for macOS

1) Download from here -> https://docs.docker.com/docker-for-mac/

2) Drag to Application Folder and double click to start and then check version in Terminal

docker --version

docker info

3) Search and Pull Docker image
E.g.

docker search kitura
docker pull ibmcom/kitura-ubuntu:latest

4) Run image with port forwarding <local port : container port>
E.g.
docker run --cap-add sys_ptrace -p 8095:8095 -t -i ibmcom/kitura-ubuntu:latest /bin/bash

5) Run / Download (if none) additional images and run as daemon

docker run -d -p 8080:8080 --name nodejs node

docker run -d -p 80:80 --name webserver nginx

6) List all downloaded or committed images
docker images

Download old images from
http://mirror.yandex.ru/mirrors/download.openvz.org/template/precreated/
and using import

cat ~/Downloads/ubuntu-10.04-x86.tar.gz | docker import - ubuntu-x86:10.04

or

docker import ubuntu-10.04-x86.tar.gz ubuntu-x86:10.04



docker run -t -i ubuntu-x86:10.04 bash

7) Run image with port forwarding <local port : container port> and bash shell

docker run -p 8095:8095 -t -i ibmcom/kitura-ubuntu:latest bash

docker run -p 80:80 -t -i nginx:latest bash

docker run -p 3000:3000 -t -i node:latest bash

docker run -t -i lballabio/quantlib:latest bash

docker run -t -i lballabio/quantlib-python:latest bash

8) List all containers with <CONTAINER ID>

docker ps -a

#export container

docker export <CONTAINER ID> > ubuntu.tar

Execute container with bash shell
docker exec -t -i <CONTAINER ID> bash

9) Commit changes to image with <newname:newtag>
docker commit <CONTAINER ID> kitura-ubuntu:v2
docker run -p 8095:8095 -it kitura-ubuntu:v2 /bin/bash

This is useful when you cannot start a container manually after docker upgraded. e.g.

docker start <CONTAINER ID> && docker attach <CONTAINER ID>

10) copy docker file to local

docker start <CONTAINER ID>

docker cp <CONTAINER ID>:/root/myfile.tgz .

Docker for Mac OSX data is at
~/Library/Containers/com.docker.docker/Data

To test the kitura docker image for Swift web app

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To test the node docker image for node.js web app

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To test the quantlib or quantlib-python3 docker image

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Try docker-compose example as per https://docs.docker.com/compose/wordpress/

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CK's IT blog