Table Of ContentMINECRAFT CODING GUIDE 4.7GB DVD
How to hack one of the greatest games ever made DISTROS & APPS
www.linuxuser.co.uk
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How Tails can
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reader with Kivy
ISSUE 140 £5.99
ISSN 2041-3270
www.lin The final part of our Kivy development series (PC▲A 9P6W8M5)/Servo Driver 9 772041 327002 40 >
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u ALSO INSIDE Wolfson Audio Program with Hack
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e
r.c » Share files with Google Drive Turn your Raspberry Pi Get started with Facebook’s
o » FOSS Twitter client super-test
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k » Farm Bitcoins with the Raspberry Pi into an audio powerhouse revolutionary new language today
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Full Page.indd 1 12/05/2014 11:36
Welcome
Get
to issue 140 of Linux User & Developer
Linux User
This issue cheaper
… Rob Zwetsloot studied aerospace engineering,
using Python to model complex every issue
simulations. This month Rob tracked
s down an elusive and anonymous » Use Grive for Google Drive
Page 28
dev team (interview pages 6-7).
t He’s since changed his name to » Upgrade your Raspberry Pi
r Neo and has taken to skulking
e around alleyways wearing outdated » Program with Hack and Octave
sunglasses and staring at cats.
p » Create an RSS reader with Kivy
Richard Smedley started using computers
x
long before WYSIWYG, and still
e maintains that the command line, Welcome to the latest edition of Linux User &
and Emacs, is the most productive Developer, the UK and America’s favourite Linux and
x working environment. This issue
Richard shows us how easy it is to open source magazine.
u free ourselves from the clutches The Raspberry Pi is British engineering at its best
of MS Small Business Server
n using Zentyal (pages 34-37). and a revolution in small form factor computing that
has really captured the imaginations of hackers and
Li Alexander Taylor is a graduate student makers all over the world. Of course, there’s only so
in Physics but saves time to
master Python’s cross-platform much technology that can be packed onto a device little larger
f
framework, Kivy, on the side.
o than a credit card. While the GPIO (General Purpose Input/
He makes Kivy screencasts and
tutorials at inclem.net. The final Output) pins allow the Pi to interact with the real world, there
m part of Alexander’s excellent Kivy
are many limitations to what enthusiasts can do with their
development series can be found
on pages 42-45 this issue. Raspberry Pi and a helping of ingenuity .
a
Thankfully there’s a growing list of add-ons, gadgets
e Sean Tracey is a creative technologist at a
leading digital agency on the south and upgrades that can help make their projects come to
t coast. He spends a lot of his time life. Starting on page 18 we’ve selected ten of our favourite
living inside of Node.js, Python
r and Arduino. For this issue Sean upgrades and show you how to integrate them into your
u discovers Hack, the new language projects and gadgets.
from the makers of Facebook that
o promises more speed and less If you fi nd yourself spending more time at the offi ce than
Y stress than PHP (pages 50-55). your workbench, all is not lost. This month we show you how
Jon Masters is a Linux kernel hacker who has to dodge Google’s refusal to release an offi cial client for its
been working on Linux for some popular Cloud Storage solution (pages 30-33); demonstrate
18 years, since he fi rst attended
how to rid yourself of MS Small Business Server with the help
university at the age of 13. Jon lives
in Cambridge, Massachusetts, of Zentyal (pages 34-37); and help you keep your customers
and works for a large enterprise
engaged with Zurmo, the gamifi ed CRM solution (pages 38-41).
Linux vendor. You can fi nd his
brilliant Kernel Column on pages Russell Barnes, Editor
16-17 this month.
Get in touch with the team:
Gareth Halfacree is our resident news
reporter and brings us the latest
developments from all over the [email protected]
open source world, starting
on page 8. Elsewhere, Gareth
reviews the Wolfson Audio Card Buy online
for Raspberry Pi and a new Matrix Facebook: Twitter:
mini-PC (pages 78-81).
Linux User & Developer @linuxusermag
Visit us online for more news, opinion, tutorials and reviews:
www.linuxuser.co.uk
3Issue 140
003_LUD_140.indd 3 15/05/2014 19:17
Contents
Reviews
73 TSwiottfert cwlieantr geroup test
Four open source Twitter clients go
Subscribe
head-to-head. Which is best?
& save!
28 S ave up to 50%
on the shop price.
US customers
can subscribe via
page 84 Gwibber Turpial
18 10 essential Raspberry Pi upgrades
Must-have gadgets to make your next Pi project really shine Birdie Choqok
78 Wolfson Audio Card
OpenSource Tutorials
Could this beef up your Pi’s
audio capabilities?
6 News 30 Use Google Drive with Linux
T he biggest stories from the Without an offi cial app, it’s down to Grive to 80 Matrix TBS2910
open source world help you sync your fi les with Linux A quad-core mini-PC that
wants to be a set-top box
16 Kernel Column 34 Free yourself from MS Small
The latest on the Linux Business Server with Zentyal 82 Tails 1.0
Kernel with Jon Masters The simple way to give your offi ce network The Amnesic Incognito Live
a complete Windows-compatible server
System hits version 1.0
85 Books
Some of the best books on 38 Manage customers with Zurmo
Linux and open source Customer relationship management is
important – Zurmo gamifi es the process MI
94 Letters NI-
Your views on the magazine 42 Code with Kivy (pt3): Create a MA
and the open source scene cross-platform RSS reader G
In his fi nal tutorial, Alexander introduces a
Features
wider array of Kivy widgets and behaviours
06 Interview: Tails 46 Program Octave
developers speak Learn Octave’s shell, its programming basics
Linux User speaks to the and how to write scripts, functions and more
anonymous dev team
On your free disc
18 10 essential Raspberry
Pi upgrades
96 Cover disc
The Pi can’t do everything –
Four of the latest distros
try these 10 cool gadgets
for you to try out
50 Learn Hack - the new on this issue’s DVD! 57 Practical Raspberry Pi
PHP replacement Tails 1.0
In this month’s Raspberry Pi super-section
Learn Facebook’s Hacklang OpenMandriva we learn how to get Lego to read books to
Lubuntu 14.04 us, code in Minecraft and find out exactly
88 Q & A
what the Compute module is all about…
Mythbuntu 14.04
Your questions answered
Join us online for more Linux news, opinion and reviews www.linuxuser.co.uk
4www.linuxuser.co.uk
004_LUD_140.indd 4 15/05/2014 19:17
Full Page.indd 1 13/05/2014 11:21
06 News | 14 Opinion | 94 Letters
secURITY
The importance of Tails
With concerns over online privacy at its highest since the birth of the
internet, we speak exclusively to the anonymous developers behind Tails…
The last year has been a rollercoaster ride in years. But we felt that something was missing Sustainability refers to how this is a project
the IT and open source community, especially to the panorama: a toolbox that would that can be relied on by its users. The team
where security and privacy is concerned. The bring all the essential privacy enhancing goes on to explain the importance of usability:
revelations of Edward Snowden in 2013 showed technologies together and made them ready “We believe that the best security tool is
the world that governments of super nations to use and accessible to a larger public. Some of no use if people who really need it on
around the world were spying on them more experiments had already been made in that the ield cannot use it. Moreover, security
than they ever thought. The Heartbleed bug direction, such as Incognito, which can be tools must be hard to misuse, they should
earlier this year revealed that even our trusted considered as the ancestor of Tails.” prevent you from doing critical mistakes, or
open source projects can let us down. In the Tails was built with two speciic things ask you to make security decisions that you
midst of this has been Tails, the distro that in mind: sustainability and usability. are not able to make.”
takes privacy seriously. As our review shows
starting on page 82, it also makes achieving a The best security tool is of no
high level of privacy easy.
“Tails started ive years ago,” the developers,
use if people who really need it on
an anonymous group of like-minded FOSS
hackers, told us. “At that time some of us
were already Tor enthusiasts and had been the ield cannot use it
involved in free software communities for
Importance of
privacy
Popular rhetoric dismissing online
privacy’s importance usually centres on
having ‘nothing to hide’.
“...The characteristics of digital
communications as well as the way
that the internet is built create a very
interesting challenge,” The Tails devs tell
us. “It is relatively easy to spy on people
on the internet, but it is also relatively
easy to defeat this spying by using
the right techniques.
“If we look at the people who are using
Tails and Tor, they come from very different
backgrounds: journalists, dissident
bloggers, privacy-concerned citizens,
whistleblowers, business leaders, victims Review
of intimate partner abuse, and even
military and law enforcement agencies. on page
[We] think that each one of them equally
inds that online privacy is important but 82
they all have their own reasons.”
nGet ready to surf privately with Tails
6www.linuxuser.co.uk
006-007_LUD140.indd 6 15/05/2014 19:18
News
The latest in the Linux community
OPEN SOURCE
Tails has been around for a while as Anonymous
previously stated, however its notoriety was
elevated after the Snowden revelations: developers
“What really changed is the public awareness
regarding those issues,” the team told us. “It is
The Tails developers do not reveal who
now hard to deny that internet security has to they are to the public and their explanation
do with politics and not only with technology. for doing so makes sense:
The Snowden revelations also made it clear “The people behind Tails have
that online privacy is an issue for everyone, and traditionally used pseudonyms to sign
not only for paranoid people. That point was their work. And this can be for different
still hard to make, even in the Linux world.” reasons: some of us want to remain
With the release of 1.0 the team is looking anonymous, some of us simply believe
ahead to the future. Coming very soon will be that our work, what we do, and how we do
the 1.1 release based on Debian 7, the new it, should be enough to trust Tails, without
stable. After that will be regular six-weekly the need of us using our legal names.
updates: “We want to focus on limiting the “Furthermore, the masters of today’s
impact of security laws, isolating critical internet, namely the marketing giants like
Google, Facebook, and Yahoo, and the
applications, and providing same-day security
spying agencies, really want our lives to
updates. Those changes will be almost invisible
be more and more transparent online, and
to the user, but they will make Tails more
this only for their own beneit. So trying
sustainable, and stronger from the inside.”
to counterbalance this tendency seems
Through their efforts, Tails is bringing a safe
like a logical position for people developing
online environment to those that need it. The nThe term ‘post-Snowden world’ is entering an operating system that defends privacy
team is working hard to make sure it stays that the vocabulary due to last year’s events
and anonymity online.”
way – and this can only be done in open source. surrounding PRISM
006-007_LUD140.indd 7 15/05/2014 19:18
OpenSource
Your source of Linux news and views
www.linuxuser.co.uk
Email us directly…
For the latest news and views [email protected]
LINUX
Linux Foundation announces
Core Infrastructure Initiative
Signs up some big names in the
hope of improving code quality
In the wake of the recent Heartbleed vulnerability The Core Infrastructure Initiative is backed by ■ Jim Zemlin, the Linux
in OpenSSL, which could leak memory data up millions of dollars in funding from its signifi cant Foundation’s executive director,
to and include private keys to attackers, the founding members, all of whom are reliant on says the Initiative will boost
Linux Foundation has now announced the Core open source software for their commercial security and code quality
Infrastructure Initiative, which seeks to fund and businesses. The overall aim is to change the way
support the development of critical infrastructure in which popular, infrastructure-critical projects are
software in the hopes of improving code quality. ffuunnddeedd,, mmaakkiinngg tthhee sswwiittcchh ffrroomm rreeaaccttiivvee ddoonnaattiioonn
In partnership with founding members Amazon, ssyysstteemmss ttoo pprrooaaccttiivvee ffuunnddiinngg..
Cisco, Dell, Facebook, Fujitsu, Google, IBM, Intel, ““MMaaiinnttaaiinniinngg tthhee hheeaalltthh ooff tthhee ccoommmmuunniittyy pprroojjeeccttss
Microsoft, NetApp, Rackspace and VMware, the tthhaatt pprroodduuccee ssooffttwwaarree ccrriittiiccaall ttoo tthhee sseeccuurriittyy aanndd
Core Infrastructure Initiative looks to collectively ssaaffeettyy ooff iinntteerrnneett ccoommmmeerrccee iiss iinn eevveerryyoonnee’’ss iinntteerreesstt,,””
identify open source projects that are in particular eeexxxppplllaaaiiinnneeeddd PPPrrrooofffeeessssssooorrr EEEbbbeeennn MMMooogggllleeennn ooofff CCCooollluuummmbbbiiiaaa
need of assistance and provide them with funding LLaaww SScchhooooll,, ffoouunnddiinngg ddiirreeccttoorr ooff tthhee SSooffttwwaarree
and expertise that will help improve the quality and FFrreeeeddoomm LLaaww CCeennttrree,, iinn ssuuppppoorrtt ooff tthhee FFoouunnddaattiioonn’’ss
reliability of their code. mmoovvee.. ““TThhee LLiinnuuxx FFoouunnddaattiioonn,, aanndd tthhee ccoommppaanniieess
Unsurprisingly, the fi rst project that will benefi t jjooiinniinngg tthhiiss IInniittiiaattiivvee,, aarree eennaabblliinngg tthheessee ddeeddiiccaatteedd
from the programme will be OpenSSL, which is pprrooggrraammmmeerrss ttoo ccoonnttiinnuuee mmaaiinnttaaiinniinngg aanndd iimmpprroovviinngg
expected to receive fellowship funding for key tthhee ffrreeee aanndd ooppeenn ssoouurrccee ssooffttwwaarree tthhaatt mmaakkeess
developers as well as additional resources to help tthhee NNeett wwoorrkk ssaaffeellyy ffoorr uuss aallll.. TThhiiss iiss bbuussiinneessss aanndd
with a code overhaul to include – critically in the ccoommmmuunniittyy ccoollllaabboorraattiioonn iinn tthhee ppuubblliicc iinntteerreesstt aanndd
case of a security package with as gaping a hole as wwee sshhoouulldd aallll bbee ggrraatteeffuull ttoo TThhee LLiinnuuxx FFoouunnddaattiioonn
Heartbleed – external reviews. ffoorr mmaakkiinngg iitt hhaappppeenn..””
“We are expanding the work we already do for FFuurrtthheerr ffuunnddiinngg ffoorr tthhee CCoorree IInnffrraassttrruuccttuurree
the Linux kernel to other projects that may need IInniittiiaattiivvee iiss bbeeiinngg rreeqquueesstteedd iinn tthhee ffoorrmm ooff
support,” explained Jim Zemlin, executive director ddoonnaattiioonnss ffrroomm tthhee ccoommmmuunniittyy,, wwhhiicchh wwiillll
of The Linux Foundation. “Our global economy is bbee hheelldd bbyy tthhee LLiinnuuxx FFoouunnddaattiioonn.. TThhiiss
built on top of many open source projects. Just as uussee ooff aa nneeuuttrraall oorrggaanniissaattiioonn,, tthhee
The Linux Foundation has funded Linus Torvalds to FFoouunnddaattiioonn ccllaaiimmss,, wwiillll hheellpp ttoo
be able to focus 100 per cent on Linux development, eennssuurree tthhaatt tthhee mmoosstt iimmppoorrttaanntt
we will now be able to support additional developers pprroojjeeccttss aarree ffuunnddeedd aanndd ccaann
and maintainers to work full-time supporting other rreettaaiinn iinnddeeppeennddeennccee tthhaatt
essential open source projects. We are thankful for ccoouulldd bbee lloosstt iiff ccoorrppoorraattee
these industry leaders’ commitment to ensuring ssppoonnssoorrsshhiipp wwaass uusseedd ffoorr
the continued growth and reliability of critical open ffuunnddiinngg.. FFoorr mmoorree ddeettaaiillss,,
source projects such as OpenSSL.” see bbiitt..llyy//11mmww22xx00ss.
We are expanding the work we
already do for the Linux kernel to
other projects that need support
8www.linuxuser.co.uk
008-011_LUD140.indd 8 15/05/2014 19:19
News
The latest in the Linux community
OPEN SOURCE
HARDWARE Linux calendar
Google shows first
Distro Recipes
e
n
Power8 motherboard u » Carrefour Numérique de La
J Villette, Paris
h » France
t
2 » distro-recipes.org
OpenPower Foundation membership starting to pay off
1
– The second Distro Recipes, this
Advertising giant Google is putting its one that prefers to build its own technologies h two-day French-language event
not-inconsiderable muscle behind IBM’s rather than buy in external solutions. While the t offers a look at the development
1 and distribution process of Linux
Power8 platform, showing off a custom motherboard on display was an engineering 1
distributions.
server motherboard it has created using its sample, engineer Gordon MacKean – chair of
membership of the OpenPower Foundation. the OpenPower Foundation – has stated that
The OpenPower Foundation is a non- Google is already porting its software stack to
profi t organisation that allows its member the Power8 architecture ahead of a planned USENIX Federated
companies to create customised versions of full-scale implementation. e Conferences Week
IBM’s Power architecture products for the fi rst n
time – and Google is a founding member. That’s u » Hyatt Regency Philadelphia at
J
no insignifi cant thing: the company represents h Penn’s Landing, Philadelphia
one of the biggest single consumers of server t » USA
0
hardware in the world. 2 » usenix.org
With IBM adding support for little-endian – Running from the Tuesday to the
Linux to Power8, Google has been working on h Friday, the USENIX conference
engineering its own custom servers based on t week includes tutorials, sysadmin
7
the platform. The fi rst board, unveiled at the 1 training, the HotStorage, HotCloud
and Feedback Computing events,
Impact 2014 conference in Las Vegas, features
and much more.
room for a pair of Power8 central processors.
The board could represent trouble for Intel, ■ Google’s Gordon MacKean has shown off
which has long held a majority share of the the company’s custom IBM Power8 hardware,
server market: Google is a big customer, but as it ports its software stack to the platform Enterprise End User
e Summit
DEVELOPMENT n
u » Covene Centre Financial District,
J
IBM supports little-endian on Power h New York
t » USA
4
IBM has confi rmed that its latest Power with full support provided for both big- and 2 » bit.ly/1hNpya4
architecture platform, Power8, will support little-endian operation. – An invitation-only event, the
little-endian operation for compatibility The move represents IBM’s desire to d Enterprise End User Summit looks
with mainstream Linux distributions and make the Power platform a more tempting 3r to join high-level Linux community
their software ecosystems. proposition for general-purpose use, where 2 developers with Linux users from
the high-performance and big
The endianness of a platform is the rewriting the entire software stack to change
business sectors.
convention used to store data in its memory; its endianness is not feasible.
big-endian stores the most signifi cant byte Initially, the Power8 platform will support a
of a word in the smallest address, while little- library of 156 Linux applications – chosen as
Exceptionally Hard
endian systems store the least signifi cant the most popular among IBM’s customers.
e
byte in the smallest address. n and Soft Meeting
Popular in the data centre and high- u
performance computing markets, the h J » DESY Hamburg
IBM Power architecture has previously t » Germany
9
been exclusively big-endian – which made 2 » ehsm.eu
it incompatible with software originally – A collaborative conference
developed for little-endian platforms h between open source and research
such as x86 and ARM. Starting with the ■ IBM’s latest Power8 platform includes 7t communities, housed in Europe’s
new Power8 architecture that will change, little-endian support for the fi rst time 2 second-largest particle physics
laboratory DESY in Hamburg.
9www.linuxuser.co.uk
008-011_LUD140.indd 9 15/05/2014 19:19
OpenSource
Your source of Linux news and views
www.linuxuser.co.uk
Email us directly…
For the latest news and views [email protected]
DEVELOPMENT
Canonical drops
Ubuntu for Android
Ubuntu Touch its focus
moving forward
Canonical has confirmed that its Ubuntu
for Android project is no longer under active
development, as the company looks to push its
Ubuntu Touch smartphone operating system
with a range of hardware launches this year.
Ubuntu for Android was announced back in
February 2012 as an installable application for
Android smartphones and tablets. When out and ■ Canonical has ceased development of Ubuntu for Android in favour of Ubuntu Touch
about, the device would run Android as normal;
when at home or in the offi ce, the device could failed to reach its lofty $30 million goal. With public view, Canonical’s Matthew Paul Thomas
be connected to a monitor, keyboard and mouse several hardware partners, Ubuntu Touch is on stated that “Ubuntu for Android is no longer in
and used as a fully functional desktop machine track for a launch later this year – but Ubuntu for development, so [its] page should be retired
running an ARM build of Ubuntu. Android cannot hope for the same. [from the Ubuntu website].”
Since its announcement, Canonical has Despite being actively promoted by the Canonical has since confi rmed that Ubuntu
used the core concepts of Ubuntu for Android company as recently as January this year and for Android is no longer in active development,
in Ubuntu Touch, a dedicated smartphone still represented on its website, Ubuntu for and will remain suspended until and unless
operating system planned for the company’s Android is unlikely to ever see a public release. the company can fi nd a launch partner for a
crowdfunded Ubuntu Edge handset until it In an internal bug report, since removed from device based on the software.
OPEN SOURCE
Red Hat buys Ceph creator Inktank
Ceph technology to be integrated with RHEL
Red Hat has announced the acquisition of ccllaassss ooppeenn ssttoorraaggee tteecchhnnoollooggiieess wwiillll ooffffeerr
large-scale storage start-up Inktank, founded ccoommppeelllliinngg ccaappaabbiilliittyy aass ccuussttoommeerrss mmoovvee ttoo
in 2012, in a deal worth $175 million. software-based scale-out storage systems.”
The company’s Ceph technology offers ““JJooiinniinngg ffoorrcceess wwiitthh RReedd HHaatt iiss ssoommeetthhiinngg
OpenStack-compatible object and block storage wwee aarree aallll vveerryy eexxcciitteedd aabboouutt,,”” aaddddeedd IInnkkttaannkk
software for public and private clouds and is ffoouunnddeerr SSaaggee WWeeiill.. ““WWee bbeelliieevvee oouurr ooppeenn
being positioned alongside Red Hat’s GlusterFS ssttoorraaggee tteecchhnnoollooggiieess wwiillll bbee ccrriittiiccaall iinn tthhee
fi le system for large-scale storage solutions. mmaannaaggeemmeenntt ooff ddaattaa iinn tthhee ccoommiinngg eerraa ooff cclloouudd
“We’re thrilled to welcome Inktank to the Red ccoommppuuttiinngg.. JJooiinniinngg RReedd HHaatt wwiillll nnoo ddoouubbtt lleeaadd
Hat family. They have built an incredibly vibrant ttoo ttrreemmeennddoouuss iinnnnoovvaattiioonn tthhaatt wwiillll sseerrvvee tthhee
community that will continue to be nurtured iinndduussttrryy wweellll aanndd aannsswweerr tthhee ddeemmaanndd ffoorr ooppeenn
as we work together to make open the de facto ssttoorraaggee ssoolluuttiioonnss ffuullllyy iinntteeggrraatteedd wwiitthh eexxiissttiinngg
choice for software-defi ned storage,” claimed and emerging data centre architectures.”
Red Hat’s chief technical offi cer Brian Stevens IInnkkttaannkk’’ss eexxiissttiinngg CCeepphh ccuussttoommeerrss iinncclluuddee
of the deal. “Inktank has done a brilliant job CCiissccoo,, CCEERRNN aanndd DDeeuuttsscchhee TTeelleekkoomm,, aanndd tthhee
assembling a strong ecosystem around Ceph ccoommppaannyy hhaass ppaarrttnneerrsshhiippss wwiitthh DDeellll aanndd AAllccaatteell--
and we look forward to expanding on this LLuucceenntt.. IInnkkttaannkk’’ss eexxiissttiinngg LLooss AAnnggeelleess aanndd SSaann ■■ IInnkkttaannkk,, aanndd iittss CCeepphh ssttoorraaggee tteecchhnnoollooggyy,, iiss
success together. The strength of these world- Francisco offi ces are expected to remain open. now wholly-owned by Linux giant Red Hat
10www.linuxuser.co.uk
008-011_LUD140.indd 10 15/05/2014 19:19
