- Smooth migration with a Git/SVN mirror using SubGit
- Cut over migration with svn2git
- Contribute to this guide
Subversion (SVN) is a central version control system (VCS) while Git is a distributed version control system. There are some major differences between the two, for more information consult your favorite search engine.
There are two approaches to SVN to Git migration:
Git/SVN Mirror which:
- Makes the GitLab repository to mirror the SVN project.
- Git and SVN repositories are kept in sync; you can use either one.
- Smoothens the migration process and allows to manage migration risks.
Cut over migration which:
- Translates and imports the existing data and history from SVN to Git.
- Is a fire and forget approach, good for smaller teams.
SubGit is a tool for a smooth, stress-free SVN to Git migration. It creates a writable Git mirror of a local or remote Subversion repository and that way you can use both Subversion and Git as long as you like. It requires access to your GitLab server as it talks with the Git repositories directly in a filesystem level.
- Install Oracle JRE 1.8 or newer. On Debian-based Linux distributions you can follow this article.
- Download SubGit from https://subgit.com/download.
- Unpack the downloaded SubGit zip archive to the
subgitcommand will be available at
The first step to mirror you SVN repository in GitLab is to create a new empty
project which will be used as a mirror. For Omnibus installations the path to
the repository will be located at
/var/opt/gitlab/git-data/repositories/USER/REPO.git by default. For
installations from source, the default repository directory will be
/home/git/repositories/USER/REPO.git. For convenience, assign this path to a
SubGit will keep this repository in sync with a remote SVN project. For convenience, assign your remote SVN project URL to a variable:
Next you need to run SubGit to set up a Git/SVN mirror. Make sure the following
subgit command is ran on behalf of the same user that keeps ownership of
GitLab Git repositories (by default
subgit configure --layout auto $SVN_PROJECT_URL $GIT_REPO_PATH
Adjust authors and branches mappings, if necessary. Open with your favorite text editor:
edit $GIT_REPO_PATH/subgit/authors.txt edit $GIT_REPO_PATH/subgit/config
For more information regarding the SubGit configuration options, refer to SubGit’s documentation website.
Now that SubGit has configured the Git/SVN repositories, run
subgit to perform the
initial translation of existing SVN revisions into the Git repository:
subgit install $GIT_REPO_PATH
After the initial translation is completed, the Git repository and the SVN
project will be kept in sync by
subgit - new Git commits will be translated to
SVN revisions and new SVN revisions will be translated to Git commits. Mirror
works transparently and does not require any special commands.
If you would prefer to perform one-time cut over migration with
import command instead of
subgit import $GIT_REPO_PATH
Running SubGit in a mirror mode requires a registration. Registration is free for open source, academic and startup projects.
For any questions related to SVN to GitLab migration with SubGit, you can contact the SubGit team directly at email@example.com.
If you are currently using an SVN repository, you can migrate the repository to Git and GitLab. We recommend a hard cut over - run the migration command once and then have all developers start using the new GitLab repository immediately. Otherwise, it’s hard to keep changing in sync in both directions. The conversion process should be run on a local workstation.
svn2git. On all systems you can install as a Ruby gem if you already
have Ruby and Git installed.
sudo gem install svn2git
On Debian-based Linux distributions you can install the native packages:
sudo apt-get install git-core git-svn ruby
Optionally, prepare an authors file so
svn2git can map SVN authors to Git authors.
If you choose not to create the authors file then commits will not be attributed
to the correct GitLab user. Some users may not consider this a big issue while
others will want to ensure they complete this step. If you choose to map authors
you will be required to map every author that is present on changes in the SVN
repository. If you don’t, the conversion will fail and you will have to update
the author file accordingly. The following command will search through the
repository and output a list of authors.
svn log --quiet | grep -E "r[0-9]+ \| .+ \|" | cut -d'|' -f2 | sed 's/ //g' | sort | uniq
Use the output from the last command to construct the authors file.
Create a file called
authors.txt and add one mapping per line.
janedoe = Jane Doe <firstname.lastname@example.org> johndoe = John Doe <email@example.com>
If your SVN repository is in the standard format (trunk, branches, tags,
not nested) the conversion is simple. For a non-standard repository see
svn2git documentation. The following
command will checkout the repository and do the conversion in the current
working directory. Be sure to create a new directory for each repository before
svn2git command. The conversion process will take some time.
svn2git https://svn.example.com/path/to/repo --authors /path/to/authors.txt
If your SVN repository requires a username and password add the
--username <username> and
--password <password> flags to the above command.
svn2git also supports excluding certain file paths, branches, tags, etc. See
svn2git documentation or run
svn2git --help for full documentation on all of the available options.
Create a new GitLab project, where you will eventually push your converted code. Copy the SSH or HTTP(S) repository URL from the project page. Add the GitLab repository as a Git remote and push all the changes. This will push all commits, branches and tags.
git remote add origin firstname.lastname@example.org:<group>/<project>.git git push --all origin git push --tags origin
We welcome all contributions that would expand this guide with instructions on how to migrate from SVN and other version control systems.