SVN to git migration script for when SVN author names are X.509 subjects * Converts svn -> git * Migrates tags and branches to proper git styling * Converts commit author names to proper name/email pairs

svn2git.sh

#!/bin/sh

# Runs an SVN to GIT migration and changes SVN commit authors which are X.509
# subjects to proper authors.
#
# Usage
# ./svn2git.sh SVN_REPO_URL NEW_GIT_FOLDER_NAME

REPO=$1
REPO_NAME=$2

if [ ! -d "$REPO_NAME" ]; then
  git svn clone $REPO --stdlayout --no-metadata --log-window-size=5000 $REPO_NAME
fi;

# SVN Tags become proper tags
(cd $REPO_NAME && git for-each-ref refs/remotes/tags | cut -d / -f 4- | grep -v @ | while read tagname; do git tag "$tagname" "tags/$tagname"; git branch -r -d "tags/$tagname"; done)
# SVN remotes to proper branches
(cd $REPO_NAME && git for-each-ref refs/remotes | cut -d / -f 3- | grep -v @ | while read branchname; do git branch "$branchname" "refs/remotes/$branchname"; git branch -r -d "$branchname"; done)


# Rewrite Authors by extracting cert owner and emails from the current author
# which is the X.509 subject. We can't do this with an --authors-file on clone
# as authors-file's chokes on authors with = in the name.
if [ ! -z $(cd $REPO_NAME && git log --oneline --author=emailAddress) ]; then
  (cd $REPO_NAME && git filter-branch -f --commit-filter 'if [[ $GIT_AUTHOR_NAME == \/emailAddress* ]]; then
    NAME=$( echo $GIT_AUTHOR_NAME | grep -o -P "(?<=CN\=)(([^\/])+)(?=\/)" );
    EMAIL=$( echo $GIT_AUTHOR_NAME | grep -o -P "(?<=emailAddress\=)(([^\/])+)(?=\/)" );

    export GIT_AUTHOR_NAME=$NAME;
    export GIT_AUTHOR_EMAIL=$EMAIL;
    export GIT_COMMITTER_NAME=$NAME;
    export GIT_COMMITTER_EMAIL=$EMAIL;
  fi; git commit-tree "$@"')
fi;