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diff --git a/doc/workflow/importing/migrating_from_svn.md b/doc/workflow/importing/migrating_from_svn.md index 1938ccd0c26..b355a91b5a6 100644 --- a/doc/workflow/importing/migrating_from_svn.md +++ b/doc/workflow/importing/migrating_from_svn.md @@ -1,17 +1,78 @@ # Migrating from SVN to GitLab -SVN stands for Subversion and is a version control system (VCS). -Git is a distributed version control system. +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 some major differences between the two, for more information consult your favorite search engine. +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. -Git has tools for migrating SVN repositories to git, namely `git svn`. You can read more about this at -[git documentation pages](https://git-scm.com/book/en/Git-and-Other-Systems-Git-and-Subversion). +Install `svn2git`. On all systems you can install as a Ruby gem if you already +have Ruby and Git installed. -Apart from the [official git documentation](https://git-scm.com/book/en/Git-and-Other-Systems-Migrating-to-Git) there is also -user created step by step guide for migrating from SVN to GitLab. +```bash +sudo gem install svn2git +``` -[Benjamin New](https://github.com/leftclickben) wrote [a guide that shows how to do a migration](https://gist.github.com/leftclickben/322b7a3042cbe97ed2af). Mirrors can be found [here](https://gitlab.com/snippets/2168) and [here](https://gist.github.com/maxlazio/f1b593b0d00aa966e9ca). +On Debian-based Linux distributions you can install the native packages: + +```bash +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. + +```bash +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 <janedoe@example.com> +johndoe = John Doe <johndoe@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](https://github.com/nirvdrum/svn2git). 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 +running the `svn2git` command. The conversion process will take some time. + +```bash +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](https://github.com/nirvdrum/svn2git) 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. + +```bash +git remote add origin git@gitlab.com:<group>/<project>.git +git push --all origin +``` ## Contribute to this guide -We welcome all contributions that would expand this guide with instructions on how to migrate from SVN and other version control systems. +We welcome all contributions that would expand this guide with instructions on +how to migrate from SVN and other version control systems. + + |