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Migrate from svn to git

Git is becoming more popular in favor of svn, as everyone knows. In this post, we'll show you how to easily migrate from svn to git. Make sure (on ubuntu for example) that you have the git-svn package installed. It should be available from your default repositories.

1. Get all the users whom have worked in your svn repo and save that info to a file

svn log -q | awk -F '|' '/^r/ {sub("^ ", "", $2); sub(" $", "", $2); print $2" = "$2" <"$2">"}' | sort -u > /tmp/svnusers.txt

The above code does the following: svn log -q: svn log displays the commit messages. With the -q parameter, you don't show the commit message, only the revision number, author and date.

This part: awk -F '|' '/^r/ {sub("^ ", "", $2); sub(" $", "", $2); print $2" = "$2" <"$2">" processes the svn log output: if the line starts with an 'r', explode the output at the '|' character, remove white spaces and put it between < and >.

This part: sort -u sorts the result and only shows the unique values.

2. Change svn to git users 

Git does'nt work with usernames like svn but with e-mail addresses so you have to change the usernames in /tmp/svnusers.txt to the corresponding e-mail addresses.

user1 = user1 user2 = user2 user3 = user3

becomes

user1 = user1 user2 = user2 user3 = user3

3. Clone the svn repo 

If your svn repo has the default trunk/branch/tags folders:

mkdir /tmp/migration git svn clone -s --no-metadata -A /tmp/svnusers.txt /tmp/migration

otherwise:

mkdir /tmp/migration git svn clone --no-metadata -A /tmp/svnusers.txt -t tags -b branches -T trunk /tmp/migration

4. migrate svn: ignore

cd /tmp/migration git svn show-ignore > .gitignore git add .gitignore git commit -m 'created .gitignore file'

5. Create a tag for every tag in svn

git branch -r | sed -rne 's, *tags/([^@]+)$,\1,p' | while read tag; do echo "git tag $tag 'tags/${tag}^'; git branch -r -d tags/$tag"; done | sh

6. Create a branch for every branch in svn

git branch -r | grep -v tags | sed -rne 's, *([^@]+)$,\1,p' | while read branch; do echo "git branch $branch $branch"; done | sh

7. Remove svn meta-data

git config --remove-section svn-remote.svn git config --remove-section svn rm -r .git/svn

8. Push to remote

git remote add origin git@gitrepo git push --all && git push --tags

There you go, everything should be in place ...

If you need more advanced stuff, check it out here: http://www.kernel.org/pub/software/scm/git/docs/git-svn.html