10 Years of Git: An Interview with Git Creator Linus Torvalds
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10 Years of Git: An Interview with Git Creator Linus Torvalds
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Ten years ago this week, the Linux kernel community faced a daunting challenge: They could no longer use their revision control system BitKeeper and no other Software Configuration Management (SCMs) met their needs for a distributed system. Linus Torvalds, the creator of Linux, took the challenge into his own hands and disappeared over the weekend to emerge the following week with Git. Today Git is used for thousands of projects and has ushered in a new level of social coding among programmers.
To celebrate this milestone, we asked Linus to share the behind-the-scenes story of Git and tell us what he thinks of the project and its impact on software development. You'll find his comments in the story below. We'll follow this Q&A with a week of Git in which we profile a different project each day that is using the revision control system. Look for the stories behind KVM, Qt, Drupal, Puppet and Wine, among others.
Why did you create Git?
Torvalds: I really never wanted to do source control management at all and felt that it was just about the least interesting thing in the computing world (with the possible exception of databases ;^), and I hated all SCM's with a passion. But then BitKeeper came along and really changed the way I viewed source control. BK got most things right and having a local copy of the repository and distributed merging was a big deal. The big thing about distributed source control is that it makes one of the main issues with SCM's go away - the politics around "who can make changes." BK showed that you can avoid that by just giving everybody their own source repository. But BK had its own problems, too; there were a few technical choices that caused problems (renames were painful), but the biggest downside was the fact that since it wasn't open source, there was a lot of people who didn't want to use it. So while we ended up having several core maintainers use BK - it was free to use for open source projects - it never got ubiquitous. So it helped kernel development, but there were still pain points.
That then came to a head when Tridge (Andrew Tridgell) started reverse-engineering the (fairly simply) BK protocol, which was against the usage rules for BK. I spent a few weeks (months? It felt that way) trying to mediate between Tridge and Larry McVoy, but in the end it clearly wasn't working. So at some point I decided that I can't continue using BK, but that I really didn't want to go back to the bad old pre-BK days. Sadly, at the time, while there were some other SCM's that kind of tried to get the whole distributed thing, none of them did it remotely well. I had performance requirements that were not even remotely satisfied by what was available, and I also worried about integrity of the code and the whole workflow, so I ended up just deciding to write my own.
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