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Install SubGit tool according to the Installation guide.
Configure GitHub
- login to GitHub and create new repository:

Configure local repository:

Run this command on behalf of the same user you use to serve Git repository:

> subgit.bat configure --layout auto --trunk TRUNK SVN_URL GIT_REPO

where

SVN_URL – URL to the SVN project.
GIT_REPO – a path to the new Git repository where data from the SVN project will be imported to.
TRUNK – a path, relative to SVN_URL, that leads to an SVN directory that plays a role of the main line of development.

> subgit.bat configure --layout auto --trunk trunk http://example.com/svn/repository/project C:\repo.git

SubGit version 3.2.4 ('Bobique') build #3670

Configuring writable Git mirror of remote Subversion repository:
Subversion repository URL : http://example.com/svn/repository/project
Git repository location : C:\repo.git

Detecting peg location...
Authentication realm: <http://example.com:80> Subversion Repository
Username [user]: user
Password for 'user':
Peg location detected: r10248 project/trunk
Fetching SVN history... Done.
Growing trees... Done.
Project origin detected: r1 project/trunk
Building branches layouts... Done.
Combing beards... Done.
Generating SVN to Git mapping... Done.

CONFIGURATION SUCCESSFUL

To complete SubGit installation do the following:

1) Adjust Subversion to Git branches mapping if necessary:
C:\repo.git\subgit\config
2) Define at least one Subversion credentials in default SubGit passwd file at:
C:\repo.git\subgit\passwd
OR configure SSH or SSL credentials in the [auth] section of:
C:\repo.git\subgit\config
3) Optionally, add custom authors mapping to the authors.txt file(s) at:
C:\repo.git\subgit\authors.txt
4) Run SubGit 'install' command:
subgit install "C:\repo.git"

Specify authors mapping
Configure authors mapping in default authors mapping file:
GIT_REPOS/subgit/authors.txt
Or change core.authors option so that it points to the global authors mapping file.
Find more details about authors mapping in Authors mapping article.

Import data into local Git repository by the command:

> subgit import GIT_REPO

> subgit import C:\repo.git
     SubGit version 3.2.4 ('Bobique') build #3670

     Authentication realm: <http://svn.example.com:80> Subversion Repository
      Username [git]: user
      Password for 'user': 

      Translating Subversion revisions to Git commits...

         Subversion revisions translated: 10248.
         Total time: 2 hours 15 minutes 38 seconds.

      IMPORT SUCCESSFUL

Sync local Git repository with GitHub:
- step into newly created local Git repository
  > cd GIT_REPO
- add a remote to the local Git repository:
  > git remote add github GITHUB_REPO
  where
  - GITHUB_REPO – GitHub project URL.
- push local repository content into GitHub repository:
  > git push github --all --follow-tags
- When the command completed, the local repository is not needed anymore and can be removed:
  > rmdir /S /Q GIT_REPO

All the files from SVN are now on GitHub, so you can clone your GitHub repository and start to work with it:

> git clone GITHUB_REPO WORK_TREE

where

WORK_TREE – a path to your working copy.
GITHUB_REPO – GitHub project URL

> git clone https://github.com/user/project.git ./project.git
     Cloning into './project.git'...
     Password for 'http://user@example.com': 
     remote: Counting objects: 99, done.
     remote: Compressing objects: 100% (39/39), done.
     remote: Total 99 (delta 50), reused 99 (delta 50)
     Unpacking objects: 100% (99/99), done.

If Git warns you that you are cloning an empty repository and you don't see your files in the working tree, most probably automatic branches and tags mapping didn't work correctly. In this case, mapping has to be set manually, see details on mapping in Branches and tags mapping.

Get support.

Have you faced with any problems, see the following guide for more details:
Note: no license key required for import!
Would you have any assistance, don't hesitate to contact us at support@subgit.com.