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Open Source Comes to Campus/Resources: Difference between revisions
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Revision as of 17:43, 18 June 2013
, 11 years ago→Version Control Demo
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(This talk is assuming you are speaking at Wellesley College. You're probably not going to be speaking at Wellesley, so you'll need to make a handful of changes!)
(FIXME: Go through this, and change the exercises so they start by having us make some edit to the page.)
* In open source software, people use version control to keep track of files as they change. To give you a sense of what this is for, how many of you have worked on group programming projects? (A few hands raise up.)
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** You can see the box at the top that says, "This is the current revision of the page." The real thing going on here is that we're using an identifier for the page that will never change, even if the page gets edited, because we're looking at the particular revision.
* Let's hit back, and take a look at an older version that has an edit summary. In this case, we see they say they added a note about New Zealand. When we click the date (Click the date)... and load the page, we can see visually that the page seems to have a note about New Zealand. But we don't know just from looking at this version of the page if maybe they made other changes.
* You folks already saw diffs, and like most version control tools, Wikipedia lets you see a diff between the two pages. It's line-based, like a lot of tools used in programming. Let's click back... (back to http://en.wikipedia.org/w/index.php?title=Wellesley_College&action=history ) and instead of clicking on the date, we'll select this revision as the first item selected, and the one right after it as the one we want to diff against. When we click "Compare selected revisions", it takes us to a page like http://en.wikipedia.org/w/index.php?title=Wellesley_College&diff=558216275&oldid=556114296
** On that page, you can see the one '''+''' line: the addition of this link to a different school in New Zealand. In particular, this shows us that there are no changes other than the particular one about the new link.
* Whew. That was a lot. Are there any questions? I'm happy to go over and review anything here. (Take questions from the whole group, since probably someone else has the same question as any individual person who asks.)
* So that's the very basics of what version control is. In open source projects, probably the most popular version control tool is called ''git''. It's a command line program, and during the laptop setup process you already installed it hopefully. At the end of this discussion we'll have you try that out, but I want to first talk about some of the key differences between git and the way Wikipedia does version control.
* First of all, Wikipedia is the encyclopedia that anyone can edit. For Wikipedia, that means that as soon as we edit a page, it's automatically live. For open source software projects, there's often a review process -- you share just your diff, and if the maintainer likes it, they ''merge'' it into the main project.
* So also, because people have to work independently, ... tool runs on their own machine
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