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• TestDrive equivalent for Ubuntu Server

  - by Marius Gedminas

  Every now and then I'd like to play with a fresh minimal install of Ubuntu (to test sysadminish scripts, application install instructions, package dependency lists etc.). I'd like to have a tool as simple to use as testdrive: pick a version (say, 'maverick'), run a command, get a shell in a new virtual machine. I'd like that shell to be in the current terminal, rather than a new GUI window that testdrive uses. Setting up the new VM to accept SSH logins with my ssh public key is fine. I'd like the VM to have network access out of the box; NAT to a virtual network interface is fine. Why a VM? Chroots don't really cut it: installing, say, Apache in a chroot would fail because it would try to listen on port 80, which is already taken. Containers might work, though, if there are any that are supported by standard Ubuntu kernels.

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• First languages with generic programming support

  - by oluies

  Which was the first language with generic programming support, and what was the first major staticly typed language (widely used) with generics support. Generics implement the concept of parameterized types to allow for multiple types. The term generic means "pertaining to or appropriate to large groups of classes." I have seen the following mentions of "first": First-order parametric polymorphism is now a standard element of statically typed programming languages. Starting with System F [20,42] and functional programming lan- guages, the constructs have found their way into mainstream languages such as Java and C#. In these languages, first-order parametric polymorphism is usually called generics. From "Generics of a Higher Kind", Adriaan Moors, Frank Piessens, and Martin Odersky Generic programming is a style of computer programming in which algorithms are written in terms of to-be-specified-later types that are then instantiated when needed for specific types provided as parameters. This approach, pioneered by Ada in 1983 From Wikipedia Generic Programming

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• Using an open source non-free license

  - by wagglepoons

  Are there any projects/products out there that use an open source license that basically says "free for small companies" and "cost money for larger companies" in addition to "make modifications available"? (And are there any standard licenses with such a wording?) If I were to release a project under such a license, would it be automatically shunned by every developer on the face of the earth, or, assuming it is actually a useful project, does it have a fair chance at getting contributions from Joe Programmer? The second part of this question can easily become subjective, but any well argued point of view will be highly appreciated. For example, do dual licensed projects made by commercial entities have success with the open source communities?

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• Google search does not show sub-pages from my website

  - by Chang

  My website appears in Google search, but only the first page. Of course I have sub-pages linked from the first page, but the sub-pages do not show in Google search. Not in Yahoo, not in Bing. What should I do? It has been three years that sub-pages do not show. (I tried searching site:mydomain.com and pressed 'repeat the search with the omitted results included' link) What would you suspect the reason? My website addresses were like xxx.php?yy=zzz etc, etc, so I changed it to /yy/zzz using mod_rewrite. I thought it might be (X)HTML standard violations, so now I changed it. I hope Google will soon have my entire website, but I am a little bit pessimistic. Do you have any thought?

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• Delivery terminology and order of magnitude

  - by Peter Turner

  What is the standard way of describing how software products are released and the proportionate order of magnitude to which the changes relative to the software product are conveyed? Is Release Update Patch Bug Fix redundant? or Is Update Patch too terse? As an end user I'd think that all bug fixes are patches (insofar as they are not 100% new code) and all patches should be updates (insofar as they don't degrade the product) and all updates should be releases (insofar as they are actually released), but this really doesn't help anyone understand why they need to get them. Then, if the person who makes the software change appends "critical" or "zero-day" in the notes, I would be unwise to leave the changes unapplied.

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• Are all languages basically the same?

  - by Anirudh

  Recently, i had to understand the design of a small program written in a language i had no idea about (ABAP, if you must know). I could figure it out without too much difficulty. I realize that mastering a new language is a completely different ball game, but purely understanding the intent of code (specifically production standard code, which is not necessarily complex) in any language is straight forward, if you already know a couple of languages (preferably one procedural/OO and one functional). Is this generally true? Are all programming languages made up of similar constructs like loops, conditional statements and message passing between functions? Are there non-esoteric languages that a typical Java/Ruby/Haskell programmer would not be able to make sense of? Do all languages have a common origin?

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• locale: Reset lost settings

  - by Adam Matan

  Due to some strange reason, I've lost some of my locale settings. I've managed to restore most of them using sudo dpkg-reconfigure locales: perl: warning: Setting locale failed. perl: warning: Please check that your locale settings: LANGUAGE = (unset), LC_ALL = (unset), LANG = "en_US.UTF-8" are supported and installed on your system. perl: warning: Falling back to the standard locale ("C"). locale: Cannot set LC_MESSAGES to default locale: No such file or directory locale: Cannot set LC_ALL to default locale: No such file or directory So I'm stuck with one missing value: $ locale locale: Cannot set LC_MESSAGES to default locale: No such file or directory locale: Cannot set LC_ALL to default locale: No such file or directory LANG=en_US.UTF-8 LC_CTYPE="en_US.UTF-8" LC_NUMERIC="en_US.UTF-8" LC_TIME="en_US.UTF-8" LC_COLLATE="en_US.UTF-8" LC_MONETARY="en_US.UTF-8" LC_MESSAGES="en_US.UTF-8" LC_PAPER="en_US.UTF-8" LC_NAME="en_US.UTF-8" LC_ADDRESS="en_US.UTF-8" LC_TELEPHONE="en_US.UTF-8" LC_MEASUREMENT="en_US.UTF-8" LC_IDENTIFICATION="en_US.UTF-8" LC_ALL= Any idea how to restore them all? Thanks, Adam

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• StreamInsight Licensing

  I cannot help but think that this is currently wrong.  There are two editions of StreamInsight (SI), Premium and Standard.  A link to their differences is here Points to note Developer Edition and Evaluation Edition represent Enterprise Edition in SQL Server but not SI where they represent Datacentre Edition.  Won’t this be confusing when people evaluating SI find that it is not the same animal when they move to Enterprise Edition? If SI Premium is the only thing you want out of the SQL Server box then it is going to be a high cost. The latency rates as well quoted on the site above make Premium Edition essential if you are going to be using this to do Real-Time analytics.

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• Efficiently representing a dynamic transform hierarchy

  - by Mattia

  I'm looking for a way to represent a dynamic transform hierarchy (i.e. one where nodes can be inserted and removed arbitrarily) that's a bit more efficient than using a standard tree of pointers . I saw the answers to this question ( Efficient structure for representing a transform hierarchy. ), but as far as I can determine the tree-as-array approach only works for static hierarchies or dynamic ones where nodes have a fixed number of children (both deal-breakers for me). I'm probably wrong about that but could anyone point out how? If I'm not wrong are there other alternatives that work for dynamic hierarchies?

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• finding a WUXGA or matte laptop

  - by John Paul Cook

  UPDATED: HP still sells 17" WUXGA laptops - details in the new paragraph at the end. Lenovo, Dell, Sony and Sager do not sell a 1920x1200 (WUXGA) laptop. I understand that manufacturers provide what there is market demand for. I also understand that HDTV and the 1080p standard is heavily influencing both monitor and laptop screen resolutions. But I do not understand why there is so little demand for a WUXGA laptop. Nor do I understand the popularity of glossy displays. I really don't like to look...(read more)

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• How can I delay dropbox from starting, but not disable it?

  - by jgbelacqua

  When I log into my user account on Ubuntu 10.10, there is a unsatisfying delay before my system becomes usable. Even launching a terminal, I have to wait a few seconds before the bash prompt appears. During this start-up period, the top process seems to be dropbox. I'm not sure what it's doing exactly (functionality is still fine as far as I can see), but I do know it really doesn't need to be doing it while I'm waiting for desktop to appear. (This is the standard Ubuntu with Gnome desktop, by the way.) What I would like to do is to be able to have a static or even dependency-based delay for dropbox to start. It would be nice if it waited for, e.g., 10 minutes, or for my browser tabs to load and a typing pause. Then it could churn away on file status or cache-chewing, and I would be happy. Is there a way to do this? Thanks!

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• Can an app in opt/extras install themeable icons in /usr/share

  - by Peter Levi

  My application Variety Wallpaper Changer runs from /opt/extras and uses an indicator icon. I would like to make this indicator icon theme-specific. As far as I understand the standard way is to install named icons into /usr/share/icons with xdg-icon-resource at installation time (Am I right about this?). I have two questions regarding this: Variety installs and runs from /opt/extras.ubuntu.com. Is it acceptable for it to install icons in /usr/share using xdg-icon-resource or is there something else I can do to have theme-specific icons without special-casing themes and dynamically selecting the icon in the code? Variety is packaged using Quickly (and I'm myself a newbie at packaging) - how can I configure it to install theme-specific named icons at installation time?

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• MAAS/Juju architecture and issues

  - by Massimo

  I recently deployed a MAAS/Juju environment based on a six nodes cluster, using Ubuntu 12.04 LTS, to run a "proof of concept". I could appreciate how interesting the architecture is, and I'd like to understand if I can really base my future business on this technology. Therefore I'd like to understand more about any involved limitations, constraints and necessities. In particular I'd like to understand: 1) how can MAAS be made reliable, i.e. deployed over two or more physical nodes able to fail-over ? 2) can the same physical cluster host multiple juju environments, under the assumption openstack/virtualization is not used ? 3) can the same physical node host different charms of the same juju environment, deployed in a standard, reliable way by juju ?

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• Securing Mobile Apps in a Bring Your Own Device World

  - by Naresh Persaud

  As more and more business users begin using their personal devices to access corporate information and resources, the number of network access requests has risen dramatically.  Access Management products and strategies that were based on an employee accessing network resources from a single desktop PC were never designed to monitor and manage an employee that is using a desktop and a laptop, a tablet, and a smartphone all from outside the corporate network, and possibly from an unsecured wireless public network. A new approach is needed to manage the types and frequency of mobile app access requests - an integrated Platform Approach to Identity and Access Management that is location and device aware, that can warn you of unusual or high risk access.  A platform that provides standard APIs so you can manage your mobile apps the same way that you manage your enterprise apps. View the slideshow below to see how the Oracle Identity Management platform can help you secure your mobile applications and data in a Bring Your Own Device World. Securing access inabyod-world-final-ext View more PowerPoint from OracleIDM

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• How to convince my boss to improve code quality?

  - by Vimvq1987

  The place I'm working for is a service provider. We have a lot of services, which are written to deal with deadline, so their code are really terrible: No coding convention, everyone codes in his own style No unit testing (which is really bad) No refactoring (which is truly worse) No automation build/deployment etc and these code are used again and again, so bad code continue to spread all over my department. I really want to set up a standard quality for our code, by requiring everyone to follow "rules": every line of code which does not follow convention will be rejected, and every function of code which does not pass unit testing will not be committed,...But I don't know how to convince my boss to allow me to do this. I'm relatively new comer, so inspiring people from my works is really hard, and I think it's easier if my boss support me to this. Thank you very much for your advices

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• Seagate sortira un disque dur de 3 To en 2010, le produit est officiellement confirmé

  Seagate sortira un disque dur de 3 To en 2010, le produit est officiellement confirmé La responsable produit de Seagate Barbara Craig a fait une annonce à l'un de nos confrères anglais, suite a des rumeurs persistantes qui animaient la toile. Et elle a confirmé ce que beaucoup avaient annoncé : Seagate sortira un disque dur d'une capacité phénoménale de 3 To au cours de l'année 2010. Ce monstre de stockage ne sera cependant pas compatible avec Windows XP (qui ne permettrait la visualisation et l'utilisation que de moins d'un tiers du disque). Il fonctionnera par contre avec ses successeurs, mais en versions 64-bits uniquement. La faute au standard d'adressage logique des disques durs, qui commence à se...

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• When to use identity comparison instead of equals?

  - by maaartinus

  I wonder why would anybody want to use identity comparison for fields in equals, like here (Java syntax): class C { private A a; public boolean equals(Object other) { // standard boring prelude if (other==this) return true; if (other==null) return false; if (other.getClass() != this.getClass()) return false; C c = (C) other; // the relevant part if (c.a != this.a) return false; // more tests... and then return true; } // getter, setters, hashCode, ... } Using == is a bit faster than equals and a bit shorter (due to no need for null tests), too, but in what cases (if any) you'd say it's really better to use == for fields inside equals?

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• Le W3C présente Web cryptography API, une norme pour améliorer la sécurité des applications Web

  Le W3C présente Web cryptography API une norme pour améliorer la sécurité des applications Web La sécurité est un aspect important dans le cycle de développement d'une application. Les développeurs ont souvent recours à des outils tiers ou doivent développer au prix de nombreux efforts leurs propres fonctionnalités de cryptographie. Le W3C (World Wide Web Consortium), l'organisme de normalisation des standards du Web ouvert, travaille actuellement sur un standard qui vise à améliorer la sécurité des applications Web tout en facilitant la tâche du développeur. L'organisme vient de publier un premier brouillon (draft) pour l'API Web cryptography. Le projet a...

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• If Ubuntu freezes when running off a USB drive, will it freeze after full installation?

  - by fearoffours

  I'm planning to install Ubuntu on an aging Compaq Presario V5000. I've established that the Unity desktop is not suited to this laptop, and am now using the standard (Gnome?) desktop. I'm grappling with ndiswrapper and my wireless chipset. But I'm still running it off a USB drive before I take the plunge and install properly to my internal HD. Part of my reticence in completing the installation is I'm experience freezes after about 10-20 minutes usage. Is this likely to be in any way related to running it off the USB drive?

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• What is the simplest human readable configuration file format?

  - by Juha

  Current configuration file is as follows: mainwindow.title = 'test' mainwindow.position.x = 100 mainwindow.position.y = 200 mainwindow.button.label = 'apply' mainwindow.button.size.x = 100 mainwindow.button.size.y = 30 logger.datarate = 100 logger.enable = True logger.filename = './test.log' This is read with python to a nested dictionary: { 'mainwindow':{ 'button':{ 'label': {'value':'apply'}, ... }, 'logger':{ datarate: {'value': 100}, enable: {'value': True}, filename: {'value': './test.log'} }, ... } Is there a better way of doing this? The idea is to get XML type of behavior and avoid XML as long as possible. The end user is assumed almost totally computer illiterate and basically uses notepad and copy-paste. Thus the python standard "header + variables" type is considered too difficult. The dummy user edits the config file, able programmers handle the dictionaries. Nested dictionary is chosen for easy splitting (logger does not need or even cannot have/edit mainwindow parameters).

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• Broken links in content reports when tracking subdomains with Google Analytics

  - by Rob Sobers

  I have a tracking code that I use on my main site and my blog, which is on a subdomain: www.example.com blog.example.com I have a single profile in Google Analytics. I use advanced segments to look at traffic to the main site vs. traffic to the blog. Problem 1: When I'm browsing my content reports under Standard Reporting, the "Page" column doesn't show the top-level or sub-domain, so I can't differentiate www.example.com/index.html from blog.example.com/index.html easily. According to the docs, this filter is supposed to make GA prepend the hostname to the page URL in your content reports, but it doesn't seem to work. Problem 2: When I click on the little "Open in new window" icon next to a given page in a content report line, it always assumes the page lives on www.example.com, so I get 404s when the page is actually on blog.example.com. Is there a good solution for these subdomain tracking problems?

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• Can't print, CUPS package corrupted and hangs on re-install

  - by Little Bobby Tables

  When I upgraded to Ubuntu 10.4 (Maverick), the upgrade process got stuck on the post-installation of the CUPS package. I had to kill processes and run several forced updates before I could finally get regular updated. Ever since I can't print - The printed file gets messed up and crashes the printer. I also can't re-install CUPS, as each time the installation hangs and I have to kill it before it completes. I tried to find a workaround for this problem, but in vain. Does anyone know how to bypass this? Or at least why can the post-installation hang, and how to re-install a problematic package? Some system specs and other hints: Dell D630 laptop running Ubuntu 10.4, Gnome desktop, standard LAN network, printing to an LPD server. Everything worked fine on 9.10. Also, the printed files themselves are not corrupted. The problem does not seem to be Evince-specific, but common to all printouts.

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• Latest MapViewer 11g patch released

  - by lqian

  Hi,   We are glad to announce that the latest MapViewer 11g patch (version 11.1.1.7.2) has just been uploaded to OTN in the usual place. This is mostly a bug fix release, with several noticeable enhancements to the HTML5 API. For the full release note, please check it here:  http://download.oracle.com/otndocs/products/mapviewer/mapviewer_11p6_2_readme.txt In a related note, our hosted mapping service (elocation.oracle.com) has also updated its MapViewer server to this release. Finally, the public demo server running all the standard mapViewer demos have been patched to 11.1.1.7.2 as well. So make sure to give the demos a spin! http://slc02okf.oracle.com    :  show cases some of the main HTML5 mapping demos http://slc02okf.oracle.com/mvdemo : the MapViewer Samples & Demos Application.  Thanks LJ 

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• How to check last changes in filesystem or directory with bash?

  - by Robert Vila

  After the system unmounted the root partition I detected that some files are missing in the filesystem. wifi and the gwibber icons disappeared from the indicator applet I want to check if there are other files missing using the ls program and the locate program, which woks on indexes of a previous state of the filesystem. Thus, locate '/usr/share/icons/*' | xargs ls -d 2>&1 >/dev/null serves for that purpose, and I can count the nonexistent files like this: locate '/usr/share/icons/*' | xargs ls -d 2>&1 >/dev/null | wc -l except for the case where filenames have blank spaces in them; and, not very surprisingly, that is the case with Ubuntu (OMG!! It is no longer "forbidden" like in good old times). If I use: locate '/usr/share/icons/*' | xargs -Iñ ls -d 'ñ' 2>&1 >/dev/null it is not working because there is some kind of interference in the syntax between the redirections of the standard outputs and the use of the parameter -I. Can anyone please help me with this syntax or giving another idea?

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• Javascript naming conventions

  - by ManuPK

  I am from Java background and am new to JavaScript. I have noticed many JavaScript methods using single character parameter names, such as in the following example. doSomething(a,b,c) I don't like it, but a fellow JavaScript developer convinced me that this is done to reduce the file size, noting that JavaScript files have to be transferred to the browser. Then I found myself talking to another developer. He showed me the way that Firefox will truncate variable names to load the page faster. Is this a standard practice for web browsers? What are the best-practice naming conversions that should be followed when programming in JavaScript? Does identifier length matter, and if so, to what extent?

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