Git to svn (read-only)

As a follow up to last post about setting up git with gitorious

Here are the steps to mirror a git branch into svn.

First, I had to install git-svn

$ sudo port deactivate git-core
$ sudo port install git-core +svn

That did not got so well when trying to run git-svn:

error about Error.pm:
Can't locate Error.pm in @INC (@INC contains...

Something did not get copied correctly. Here’s the solution:

$ cp /opt/local/var/macports/software/git-core/1.5.2.4_1+doc/opt/local/lib/perl5/site_perl/5.8.8/Error.pm /opt/local/lib/perl5/site_perl/5.8.8/

Then create a place holder in svn so a location exist (it’s fine if it is empty):

$ svn mkdir svn+ssh://svn.nanorails.com/home/psq/svn/plugins/plugins/rur -m "creating rur"

Then add this to .git/config:

[svn-remote "nanorails"]
  url = svn+ssh://svn.nanorails.com/home/psq/svn/plugins/plugins/rur
  fetch = :refs/remotes/nanorails

nanorails will become the name of the branch

Then fetch the svn (it won’t fetch anything, but this starts the process).

$ git svn fetch nanorails

$ git branch -a
* master
  nanorails

And the new branch is here :)

Checkout that svn branch into a local branch:

$ git checkout -b local-svn nanorails
Switched to a new branch "local-svn"

$ git branch -a
* local-svn
  master
  nanorails

Now the fun part.

Using rebase will forward the local commits to the updated upstream head

$ git-svn rebase
Current branch local-svn is up to date.

Get all the goodies from the master branch

$ git merge master
Merge made by recursive.
 .gitignore                            |    1 +
 MIT-LICENSE                           |   21 ++
 README                                |   48 +++++
 Rakefile                              |   20 ++
 init.rb                               |    3 +
 lib/undo_action.rb                    |   24 +++
 lib/undo_manager.rb                   |   89 ++++++++
 lib/undo_record.rb                    |  224 ++++++++++++++++++++
 lib/undoable.rb                       |   40 ++++
 lib/undoable_helper.rb                |   23 ++
 migrations/001_create_undo_records.rb |   32 +++
 spec/rur_spec.rb                      |  132 ++++++++++++
 spec/spec_helper.rb                   |   26 +++
 spec/undo_action_spec.rb              |   46 ++++
 spec/undo_manager_spec.rb             |   10 +
 spec/undo_record_spec.rb              |  368 +++++++++++++++++++++++++++++++++
 spec/undoable_spec.rb                 |   46 ++++
 17 files changed, 1153 insertions(+), 0 deletions(-)
 create mode 100644 .gitignore
 create mode 100644 MIT-LICENSE
 create mode 100644 README
 create mode 100644 Rakefile
 create mode 100644 init.rb
 create mode 100644 lib/undo_action.rb
 create mode 100644 lib/undo_manager.rb
 create mode 100644 lib/undo_record.rb
 create mode 100644 lib/undoable.rb
 create mode 100644 lib/undoable_helper.rb
 create mode 100644 migrations/001_create_undo_records.rb
 create mode 100644 spec/rur_spec.rb
 create mode 100644 spec/spec_helper.rb
 create mode 100644 spec/undo_action_spec.rb
 create mode 100644 spec/undo_manager_spec.rb
 create mode 100644 spec/undo_record_spec.rb
 create mode 100644 spec/undoable_spec.rb

And finally, send the changes to svn

$ git-svn dcommit
Committing to svn+ssh://svn.nanorails.com/home/psq/svn/plugins/plugins/rur ...
    A    .gitignore
    A    MIT-LICENSE
    A    README
    A    Rakefile
    A    init.rb
    A    lib/undo_action.rb
    A    lib/undo_manager.rb
    A    lib/undo_record.rb
    A    lib/undoable.rb
    A    lib/undoable_helper.rb
    A    migrations/001_create_undo_records.rb
    A    spec/rur_spec.rb
    A    spec/spec_helper.rb
    A    spec/undo_action_spec.rb
    A    spec/undo_manager_spec.rb
    A    spec/undo_record_spec.rb
    A    spec/undoable_spec.rb
Committed r66
    A    Rakefile
    A    .gitignore
    A    init.rb
    A    lib/undo_manager.rb
    A    lib/undo_action.rb
    A    lib/undo_record.rb
    A    lib/undoable_helper.rb
    A    lib/undoable.rb
    A    MIT-LICENSE
    A    spec/undo_record_spec.rb
    A    spec/rur_spec.rb
    A    spec/undoable_spec.rb
    A    spec/spec_helper.rb
    A    spec/undo_manager_spec.rb
    A    spec/undo_action_spec.rb
    A    migrations/001_create_undo_records.rb
    A    README
r66 = 98602d45907206a281f597f87445397f069cdc1d (nanorails)
No changes between current HEAD and refs/remotes/nanorails
Resetting to the latest refs/remotes/nanorails

And then there was much rejoicing across the land :)

Now, to update svn, the only things to do, assuming master is where the latest is, are:

$ git checkout local-svn
$ git merge master
$ git-svn dcommit

This setup could also bring changes back from svn, which git-svn is capable of doing, but I’ll be quite happy with the read-only part.

Resources:

1. using-git-with-svn
2. git-svn
3. git tutorial
4. gitorious

Update: in fact, it looks like “git-svn dcommit” from the master branch, without merging to the “local-svn” branch first, also commits to svn.