Mario Mario - 1 year ago 101
Git Question

Locking binary files using git version control system

For one and a half years, I have been keeping my eyes on the git community in hopes of making the switch away from SVN. One particular issue holding me back is the inability to lock binary files. Throughout the past year I have yet to see developments on this issue. I understand that locking files goes against the fundamental principles of distributed source control, but I don't see how a web development company can take advantage of git to track source code and image file changes when there is the potential for binary file conflicts.

To achieve the effects of locking, a "central" repository must be identified. Regardless of the distributed nature of git, most companies will have a "central" repository for a software project. We should be able to mark a file as requiring a lock from the governing git repository at a specified address. Perhaps this is made difficult because git tracks file contents not files?

Do any of you have experience in dealing with git and binary files that should be locked before modification?

NOTE: It looks like Source Gear's new open source distributed version control project, Veracity, has locking as one of its goals.

Answer Source

In response to Mario's additional concern with changes happening in multiple places on the binaries. So the scenario is Alice and Bob are both making changes to the same binary resource at the same time. They each have their own local repo, cloned from one central remote.

This is indeed a potential problem. So Alice finishes first and pushes to the central alice/update branch. Normally when this happens, Alice would make an announcement that it should be reviewed. Bob sees that and reviews it. He can either (1) incorporate those changes himself into his version (branching from alice/update and making his changes to that) or (2) publish his own changes to bob/update. Again, he makes an announcement.

Now, if Alice pushes to master instead, Bob has a dilemma when he pulls master and tries to merge into his local branch. His conflicts with Alice's. But again, the same procedure can apply, just on different branches. And even if Bob ignores all the warnings and commits over Alice's, it's always possible to pull out Alice's commit to fix things. This becomes simply a communication issue.

Since (AFAIK) the Subversion locks are just advisory, an e-mail or instant message could serve the same purpose. But even if you don't do that, Git lets you fix it.

No, there's no locking mechanism per se. But a locking mechanism tends to just be a substitute for good communication. I believe that's why the Git developers haven't added a locking mechanism.

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