Git SVN Migration script with tagging structure

svnMigGitLatestTag.sh

#!/bin/bash
# Script checkout SVN as git repository,
# move trunk to develop branch
# and create a master branch based on latest tag

#constants
SVN_TMP_FILE=svnlog.txt
BRANCH_FILE=branch.txt
LATEST_ANNUAL=""

#variables
revision=""
project=""

#ARGUMENTS: SVN-URL BRANCHES 
SVN_URL=$1
FILTER_YEAR=$2
#BRANCHES=$3


if [[ $1 == "" ]]; then
    echo "Missing SVN-URL: svnmigration.sh SVN-URL"
    exit 0
fi

#get folder / project name
delimiter=/
s=$SVN_URL$delimiter
project=""

while [[ $s ]]; do
    project=( "${s%%"$delimiter"*}" );
    s=${s#*"$delimiter"};
done; 

echo "###### ${project} #####" 

echo "Checking for latest revision in ${SVN_URL}..."
svn log $SVN_URL > $SVN_TMP_FILE

while read row; do
    # filter only commits (commit/user/date/details)
    if [[ $row == *"|"* ]]; then
        # split REV | USER | DATE | LINE
        # echo "${row}"
        IFS="|" read -ra list <<< "$row"
        
        #revision
        svn_revision="${list[0]}"
        
        #date
        commit_date="${list[2]}"
        year=${commit_date:0:5}
        
        #echo "${svn_revision} - ${year}"
        if [[ "$year" -ge "$FILTER_YEAR" ]]; then
            #echo "${year} - ${FILTER_YEAR}"
            revision="${svn_revision}"
        fi
    fi
done < $SVN_TMP_FILE

#remote tmp file
rm -f $SVN_TMP_FILE

#trim spaces
revision="$(echo -e "${revision}" | tr -d '[:space:]')"

echo "Latest SVN revision: ${revision} (${FILTER_YEAR})"


#clone svn repository
echo "Clone ${SVN_URL}..."
clone_argument="-${revision}:HEAD"
git svn clone -s $clone_argument $SVN_URL

cd $project

#rename master to develop branch
echo "rename branch trunk/master as develop"
git branch -m master develop

##### MOVE LAST TAG TO MASTER ###############

# get all branches
git branch -r --sort=-committerdate > $BRANCH_FILE


#latest tag
latestTag=""

while read row; do
    if [[ $row == *"/tags/"* ]]; then
        latestTag=$row
        break;
    fi
done < $BRANCH_FILE

if [[ $latestTag == "" ]]
then
    # no tags -> no master
    echo "No Tags available"
else
    #rename tagged branch to master
    echo "created branch ${latestTag} as master"
    git checkout -b  master $latestTag

    # move tag branch to master
    IFS="/" read -ra branchTags <<< "$latestTag"

    # origin/tags/App.1.0.0 => App.1.0.0
    tagName="${branchTags[-1]}"

    #create Tag
    echo "created tag ${tagName}"
    git tag -a $tagName -m "migrated tag"
fi


#remote tmp file
rm -f $SVN_TMP_FILE
rm -f $BRANCH_FILE


echo "######################################"
echo "SVN preparation finished"
echo "Next step:"
echo "git remote add origin URL\ngit push -u origin --all\ngit push origin --tags"