Manas Tungare

My Blog

HOWTO Obtain metadata for a book given its ISBN using Amazon Web Services in PHP

This is a quick snippet I put together for an academic project. To be able to write this, I had to go through several documentation resources, for what is essentially a single web service method call. I figured it would help if I shared my PHP code.

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HOWTO Setup WebDAV on Mac OS X

Setting up WebDAV on Leopard

The good news is that all the bits and pieces of software that you need to run a WebDAV server on Mac OS X 10.5 Leopard are already installed. You only need to configure them correctly and turn them on. Some experience with Terminal is preferred, and you should be familiar with executing UNIX commands. Let's start!

  1. Start Apache. (If you haven't already) You will need to enable Web Sharing, since the WebDAV service will be provided by Apache, the web server on Mac OS X. You do not necessarily need to have a web site running, but you will need to activate and run Apache. Go to System Preferences > Sharing, and turn on the box labeled Web Sharing.
    Mac OS X Preferences Screenshot -- Enabling Web Sharing
  2. Enable WebDAV support in Apache. Edit the file /etc/apache2/httpd.conf, (remember to use sudo to edit it) and locate this line:
    LoadModule dav_module libexec/apache2/

    Make sure it is not commented (there should be no "#" at the beginning of the line.) Then locate this line (towards the bottom of the file):

    Include /private/etc/apache2/extra/httpd-dav.conf

    Again, make sure it is not commented out. It is disabled by default, so you need to remove the "#" from this line.</li>

  3. Configure WebDAV. Next, edit the file /etc/apache2/extra/httpd-dav.conf. Add a section in it to create our new WebDAV share. Here's what the new section should look like. As a security precaution, you should also go ahead and delete the /usr/uploads share that is set by default.
    Alias /webdav "/Library/WebServer/WebDAV"
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Free as in freedom, not as in beer

I received a request today in the mail about one of my projects that is available under a free software license. It's a web template system that I wrote to scratch a personal itch. Its hallmark feature is that it has no features, at least none that contribute to the bloat that's rampant in Drupal and Joomla and their ilk.

His email was very well-written, asking about some of the specifics of the license, and how he could undertake projects for his clients building upon my framework. After I wrote a detailed reply to him, it seemed like a good idea to post it to my blog, for there are many who're not particularly clear on how free software licensing works.

I want to use your templating system to build static websites for personal and commercial projects. I don't have lots of money so I can't promise much now but later if I will be able to make any money I will happily donate for this project.
I like open source projects because it is fun to learn how magic happens. I don't want to use your code without permission because I just personally don't think it is right thing to do. I have no problem giving you credit for this system but I need your permission to use it for commercial use?


And my reply:

Hi [redacted],

I'm glad you found the site and my projects interesting and useful, and thanks so much for writing back to let me know!

I think free software is a great way to learn and understand other people's code, that's why almost all of my projects are open-source with the license to tinker and play. All I ask in return (via the Creative Commons license) is attribution back to me if you use it in a project. I've licensed this as an Attribution-ShareAlike-Noncommercial license, so you're free to use it as you wish in any personal project as long as it is non-commercial: e.g. for an organization you belong to, or an academic department or program.

Things get a little more interesting when money enters the picture. While I'm not doing this (releasing my software) for the express purpose of making money from it, it does not seem right to me that someone else benefit financially from my work with no benefit to me. So, I politely ask that if you're planning to use this commercially, you should contact me for a separate license (the code will then be dual-licensed, and you can pick either the paid commercial license, or the default un-paid non-commercial one.)

You don't have to pay anything right away, and can play with the code as much as you want. But when you bag a client who wants to use a system based on my code, we can talk about royalties. That way, you retain the freedom to examine and modify my code as well as get a paying client, and I do not feel that someone has taken undue advantage of my generosity. This is how the open-source model was intended to work, and the free really refers to freedom, not free as in no-charge.

I'm glad you contacted me to check for permission first, and I got the opportunity to clarify. Often it's quite tricky, and lots of people have lots of misunderstandings about how free software licenses work.


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SSH Port Forwarding on Mac OS X

After spending about an hour configuring what should, in theory, be a simple matter, I figured I’d write a blog post that might one day save another soul an hour or so from his or her life. So, for good karma, basically. In the past, I have set up port forwarding on Linux, Mac OS X and Windows, so I was a little worried that it took me about an hour trying to appease the SSH deities (and daemons).

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Readymade luggage kits for baggage-less air travelers

Now there's a business opportunity that today's airline industry and airports have created: why not sell pre-packaged suitcases at airports to scalp travel-weary passengers whose luggage has landed in Murmansk?

Here's how it would work: I'd walk up to the Lost and Found desk of the airline, usually fortified behind several layers of arrows pointing upward, downward, or in all other sorts of directions in which I cannot walk; barriers laid down with those flexible tapes that you can simply unhook and pass through; or behind a scruffy-looking bouncer. They would then cheerfully inform me that my luggage has, indeed, failed to follow me around in my travails around the world, and make me fill out a 3-page form describing my "small black bag" in as many words. After a state of shock, worry, desperation, and finally, anger, I would quit discussing this with the airline folks and move on, resigned to my fate.

That's when I would notice the conveniently located "Missing Luggage Mart". I'd turn to the enterprising store-owner and tell him/her my size, and the duration of my trip. He/she would whip out a readymade suitcase of shirts, t-shirts, trousers, undergarments, socks, shorts, a belt, a cellphone charger, a toothbrush, a toothpaste, a tiny bottle of shaving cream, a tiny bottle of shampoo, etc., and I would be on my own merry way.

And a towel, of course. Nobody should ever be without their towel.

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