relocation of git-svn repositories

gitsvnrelocate.sh

#!/bin/bash
# Helper to relocate git-svn urls.


OLD_REPO=`git config --local --get svn-remote.svn.url`

if [[ $1 ]] ; then
    NEW_REPO=$1
else 
    NEW_REPO='https://defaultrepourl/lalal/'
fi

escape_val() {
    return_val=$(echo "$1" | sed 's/[^-A-Za-z0-9_]/\\&/g')
    return 0
}

build_filter() {
   escape_val $1
   val1=${return_val}
   escape_val $2
   val2=${return_val}
   return_val="sed \"s/git-svn-id: ${val1}/git-svn-id: ${val2}/g\""
   return 0
}


prepare_switch() {
    echo "* Stashing orphaned files (use git stash pop later to get them back)"
    git stash save

    echo "* Running garbage collection"
    git gc

    return 0
}

do_switch() {

    if [[ $2 ]] ; then
        echo "* Migrating from ${1} to ${2}"
    else
        exit 1
    fi
    build_filter ${1} ${2}
    svn_filter=$return_val

    echo -e "\n* Rewrite the git history to reflect new repository URL"
    git filter-branch -f --msg-filter "${svn_filter}" $(cat .git/packed-refs | awk '// {print $2}' | grep -v 'pack-refs')

    echo -e "\n* Setting new svn-remote url"
    git config --local --replace-all svn-remote.svn.url ${2}

    return 0
}

rebuild_index() {
    echo "* Removing old svn meta info."
    rm -rf .git/svn

    echo -e "\n* Rebuild svn index"
    git svn rebase

    return 0
}



echo "-------------------------------------"
echo " Use at your own risk "
echo "-------------------------------------"
echo "Migrating from ${OLD_REPO} to ${NEW_REPO}."
if [[ $OLD_REPO == $NEW_REPO ]] ; then
    echo "Old and new repository URL is the same!"
    echo "Already switched to new URL?"
    echo "I'm stopping now."
    exit 1
fi

echo "Proceed? (y/n)"
read dorun
if [[ $dorun == "y" ]] ; then

    echo "Prepare..."
    prepare_switch
    echo -e "\n\nSwitching..."
    do_switch $OLD_REPO $NEW_REPO
    echo -e "\n\nRebuilding..."
    rebuild_index
    echo -e "\n* DONE: now the result"
    git svn info
    exit 0
else 
    echo "Canceled."
    exit 1
fi