Skip to main content

Some clarifications on living with Git and SVN

This post is part of a series on Git and Subversion. To see all the related posts, screencasts and other resources, please click here

I'm afraid I exaggerated in my previous posts, and given the impression that living with Git and Subversion in parallel is easy. I would update it, but Blogger is refusing to edit the post without screwing it up. So here it is in clear text:

Be prepared to face some major constraints in using Git against a Subversion repo, compared to how it using Git standalone.


The manual says it best:
The git svn tools are useful if you’re stuck with a Subversion server for now or are otherwise in a development environment that necessitates running a Subversion server. You should consider it crippled Git, however, or you’ll hit issues in translation that may confuse you and your collaborators. To stay out of trouble, try to follow these guidelines:
  • Keep a linear Git history that doesn’t contain merge commits made by git merge. Rebase any work you do outside of your mainline branch back onto it; don’t merge it in.
  • Don’t set up and collaborate on a separate Git server. Possibly have one to speed up clones for new developers, but don’t push anything to it that doesn’t have a git-svn-id entry. You may even want to add a pre-receive hook that checks each commit message for a git-svn-id and rejects pushes that contain commits without it.

As you can understand, this takes some of the fun out of using Git (although it's still a much better SVN client than SVN). Another clarification:


In the previous post, I stated that you have to manually enter a value into .git/refs/remotes/git-svn. It appears that you have to have to repeat this every time new changes come into the SVN-fetching repository. Fortunately, there's an easier way to update the ref:

git update-ref refs/remotes/git-svn refs/remotes/origin/master

You have to do the above after pulling from the SVN fetching repo, and before you run git svn dcommit (found this here).  This seems a bit awkward, and you'd wonder why this isn't built into git-svn. I asked about it on the #git IRC channel, and they said that the "recipe" configuration doesn't support a single url tracking branch. It has to be a standard -s layout. I should test this though, currently I'm just syncing with one branch in SVN. In the mean time, I dcommit with a little script that runs update-ref first, and then does the dcommit.

Some more resources:

Comments

Post a Comment

Popular posts from this blog

Open source CMS evaluations

I have now seen three more or less serious open source CMS reviews. First guy to hit the field was Matt Raible ( 1 2 3 4 ), ending up with Drupal , Joomla , Magnolia , OpenCms and MeshCMS being runner-ups. Then there is OpenAdvantage that tries out a handful ( Drupal , Exponent CMS , Lenya , Mambo , and Silva ), including Plone which they use for their own site (funny/annoying that the entire site has no RSS-feeds, nor is it possible to comment on the articles), following Matt's approach by exluding many CMS that seem not to fit the criteria. It is somewhat strange that OpenAdvantage cuts away Magnolia because it "Requires J2EE server; difficult to install and configure; more of a framework than CMS", and proceed to include Apache Lenya in the full evaluation. Magnolia does not require a J2EE server. It runs on Tomcat just like Lenya does (maybe it's an idea to bundle Magnolia with Jetty to make it seem more lightweight). I'm still sure that OpenAdvant

Git Stash Blooper (Could not restore untracked files from stash)

The other day I accidentally did a git stash -a , which means it stashes *everything*, including ignored output files (target, build, classes, etc). Ooooops.. What I meant to do was git stash -u , meaning stash modifications plus untracked new files. Anyhows, I ended up with a big fat stash I couldn't get back out. Each time I tried, I got something like this: .../target/temp/dozer.jar already exists, no checkout .../target/temp/core.jar already exists, no checkout .../target/temp/joda-time.jar already exists, no checkout .../target/foo.war already exists, no checkout Could not restore untracked files from stash No matter how I tried checking out different revisions (like the one where I actually made the stash), or using --force, I got the same error. Now these were one of those "keep cool for a second, there's a git way to fix this"situation. I figured: A stash is basically a commit. If we look at my recent commits using   git log --graph --

Leaving eyeo

Thirteen blog posts later, this one notes my departure from eyeo after 4 years and 3 months. I joined eyeo around the headcount of 80 employees, and now I think there's just over 250 people there. My role coming in was as operations manager, doing a mix of infrastructure engineering and technical project management. I later on took on organizational development to help the company deal with its growing pains . We introduced cross-functional teams, departments (kind of like guilds), new leadership structures, goal-setting frameworks, onboarding processes and career frameworks.  And all of this in a rapidly growing distributed company. I'm proud and happy that for a long time I knew every employee by name and got to meet every single new-hire through training them on company structure and processes.  At some point, we had enough experienced leaders and organizational developers that I could zoom back in on working in one team, consulting them on  Git and continuous integration

Managing dot-files with vcsh and myrepos

Say I want to get my dot-files out on a new computer. Here's what I do: # install vcsh & myrepos via apt/brew/etc vcsh clone https://github.com/tfnico/config-mr.git mr mr update Done! All dot-files are ready to use and in place. No deploy command, no linking up symlinks to the files . No checking/out in my entire home directory as a Git repository. Yet, all my dot-files are neatly kept in fine-grained repositories, and any changes I make are immediately ready to be committed: config-atom.git     -> ~/.atom/* config-mr.git     -> ~/.mrconfig     -> ~/.config/mr/* config-tmuxinator.git       -> ~/.tmuxinator/* config-vim.git     -> ~/.vimrc     -> ~/.vim/* config-bin.git        -> ~/bin/* config-git.git               -> ~/.gitconfig config-tmux.git       -> ~/.tmux.conf     config-zsh.git     -> ~/.zshrc How can this be? The key here is to use vcsh to keep track of your dot-files, and its partner myrepos/mr for o

Git tools for keeping patches on top of moving upstreams

At work, we maintain patches for some pretty large open source repositories that regularly release new versions, forcing us to update our patches to match. So far, we've been using basic Git operations to transplant our modifications from one major version of the upstream to the next. Every time we make such a transplant, we simply squash together the modifications we made in the previous version, and land it as one big commit into the next version. Those who are used to very stringent keeping of Git history may wrinkle their nose at this, but it is a pragmatic choice. Maintaining modifications on top of the rapidly changing upstream is a lot of work, and so far we haven't had the opportunity to figure out a more clever way to do it. Nor have we really suffered any consequences of not having an easy to read history of our modifications - it's a relatively small amount of patches, after all. With a recent boost in team size, we may have that opportunity. Also the need for be