SVN Git Mirror

SVN_Git_Mirror.md

Bridging SVN & Git

This guide will demonstrate how to mirror SVN commits over to GIT. Work in progress...

References

First off, I'll give some credits. I've lifed all this information from various placed on the web.

• http://help.github.com/mac-set-up-git
• http://swik.net/Rails/Robby+on+Rails/git-svn+is+a+gateway+drug/cboew

Creating the Local Git Repository

# Clone an SVN repo with Git
git svn init -s http://svn.yourdomain.com/repos/project_name
cd project_name

# Fetch the SVN branches to the local Git repo
git svn fetch

# Once this is done, you’re local 'master' branch is linked to trunk/.
# Make a new branch for develop & check it out
git checkout -b develop 

# Back to master.
git checkout master

# We'll change this to link local 'develop' branch to trunk
git reset --hard production

Adding a Git remote

Now we have Git branches properly mapped to SVN branches. But, our only remote is the SVN repostory.

Either use an existing Git repository, or create a new one. You will need the remote Git URL to add the remote.

git remote add origin [email protected]:guidance/emergencylink.git

Where did you get the "production" branch from under the "Creating the Local Git Repository" section?

Grammar: "you’re" should be "your".

I think that git reset --hard production should be read as git reset --hard develop

s/get svn rebase/git svn rebase/

I'm trying to do something similar, but I can't for the life of me understand what this step is doing:

# We'll change this to link local 'develop' branch to trunk
git reset --hard production

Why the reset?

Hello,

please take a look at my 14 lines script: https://github.com/JuergenKosel/git-svn-mirror/blob/master/git-svn-mirror.sh.
The script mirrors all branches from svn into a git repository.

Here is another one click solution over pure and raw windows batch scripts (windows only).

http://svn.code.sf.net/p/contools/deploy/trunk/solutions/all-in-one/
(no sources inside, you have to checkout it through the svn)

Supported only svn-to-git mirroring.

If you want to something clean and bigger, then you have to write your own one.

UPDATE:
Link does not exist anymore. Have found another solution with permanent migration using subgit + vcstool (with sparse checkout fork):

https://subgit.com/documentation/import-book.html
dirk-thomas/vcstool#243
dirk-thomas/vcstool#249
chronoxor/gil#6
gitextensions/gitextensions#10644
https://git-scm.com/docs/git-sparse-checkout

@andry81
Your link is offline :(

@farOverNinethousand I've removed it because completely moved to the git. If you still want to mirror (not migrate, but not excluding that), then I recommend to use the SubGit: https://subgit.com/documentation/

The SubGit is the only reliable solution I could find and it is free for SVN migration:

If you are doing a one-time migration from SVN to git, you may use SubGit without any license — just download the tool.
Yet if you need support, sign up for a trial license.

If you want to start partial migration to migrate later completely, then you can use original repo of vcstool: https://github.com/dirk-thomas/vcstool (vcstool2 has removed support of not Git repositories)

It can use GIT external repositories together with SVN external repositories.

PS: SVN-to-Git mirroring is a pain in arse, DO NOT use it, instead migrate to Git and use Git instead.

@andry81
Damn SVN-to-GIT mirroring is exactly what I wanted to do here.
Many thanks for the super detailed response!

@farOverNinethousand There is too many blocks and pitfalls on the road of a full SVN-to-Git mirroring. One of these are svn:externals. There is no a reliable way to mirror them because it requires a remote repo creation on a Git hub or server. There is no such functionality in the Git, because it is a part of a hub. All you can do is write down a script to map all svn:externals to Git branches or external repos, but that is not easy either. I can recall only one script that has tried to acquire this:
https://support.tmatesoft.com/t/script-for-conversion-of-svn-externals-to-git-submodules/2980
https://github.com/newren/git-filter-repo/blob/main/contrib/filter-repo-demos/convert-svnexternals

And there won't be any duplex mode. If you commit and pushed something to the Git manually, then you have to manually port it back to the SVN.

@andry81
Okay someone just did exactly what I was looking for (a mirror of the JDownloader SVN repo): mirror/jdownloader#58 (comment)
-> https://github.com/mycodedoesnotcompile2/jdownloader_mirror/
Looks like he did this with github actions?
Thank you nevertheless for your detailed answer. If I ever need to set this up myself, I know where to find all relevant information.

To search:
https://useful-forks.github.io/?repo=mirror/jdownloader
https://github.com/search?q=jdownloader&type=repositories

@farOverNinethousand

Okay someone just did exactly what I was looking for (a mirror of the JDownloader SVN repo): mirror/jdownloader#58 (comment) -> https://github.com/mycodedoesnotcompile2/jdownloader_mirror/

This is not a complete and automatic mirror. He just checkouts 4 predefined root directories and pushes them into the git repo. If there would be other root directories or a root directory rename, then the script will miss that. All svn properties seems does ignore too.

@andry81
Okay good to know.
The links to the forks are not helpful though as there is no current git mirror of the JDownloader SVN available apart from [maybe] the new one I linked.
Thanks for the additional explanation regarding the missing SVN properties.

This link: http://swik.net/Rails/Robby+on+Rails/git-svn+is+a+gateway+drug/cboew no longer works