Get full tutorial here : https://cedricleruth.com/how-to-migrate-an-svn-repository-to-git-and-your-company-gitlab/

MigrateSvnProjectToCompanyGitlabGit.sh

#Once your local git can communicate with the gitlab server you can start migrating:
#Inspired from https://john.albin.net/git/convert-subversion-to-git

#First got to your gitlab and add a new project (in this tuto : YOUR_GITLAB_REPO.git)

#check out your svn project, right click in it and run git bash here to run the following command :
#Download all author commit data to update it to Git standard:
svn log -q | awk -F '|' '/^r/ {sub("^ ", "", $2); sub(" $", "", $2); print $2" = "$2" <"$2">"}' | sort -u > authors-transform.txt

#update the authors-transform.txt file with the git format e.g: 
vi authors-transform.txt
username = FirstName lastName <YOUR_EMAIL@YOUR_COMPANY.com>
#:wq(to save and quit vi)

#Transform the svn repos into a temporary local git(~/temporary-git-project) with the updated author infos
#this temporary-git-project is added to your document folder in windows
git svn clone https://YOUR_SVN_REPOSITORY --no-metadata -A authors-transform.txt ~/temporary-git-project

#Add the svn-ignore files as git-ignore files :
cd ~/temporary-git-project
git svn show-ignore > .gitignore
git add .gitignore
git commit -m 'Convert svn ignore to .gitignore.'

#Create a temporary local bare git repository
git init --bare ~/temporary-local-git.git
cd ~/temporary-local-git.git
git symbolic-ref HEAD refs/heads/trunk

#push our temporary locale git project to the new bare git repository
cd ~/temporary-git-project
git remote add bare ~/temporary-local-git.git
git config remote.bare.push 'refs/remotes/*:refs/heads/*'
git push bare

#rename the trunk to master (git naming convention)
cd ~/temporary-local-git.git
git branch -m git-svn master

#update bare git remote origin to the company gitlab url 
cd ~/temporary-local-git.git
vi config
[core]
	repositoryformatversion = 0
	filemode = false
	bare = true
	symlinks = false
	ignorecase = true
[remote "origin"]
	url = git@gitlab.YOUR_COMPANY.com:YOUR_GITLAB_REPO.git
	fetch = +refs/heads/*:refs/remotes/origin/*
[branch "master"]
	remote = origin
	merge = refs/heads/master
	
#:wq(to save and quit vi)

#push the temporary git to your gitlab project (remote url added above)
cd ~/temporary-local-git.git
git push -u origin --all
git push -u origin --tags

#Delete all temporary files 
rm -Rf ~/temporary-local-git.git
rm -Rf ~/temporary-git-project

#clone Gitlab git repository into your new working copy folder 
cd C:/Git/
git clone git@gitlab.YOUR_COMPANY.com:YOUR_GITLAB_REPO.git
# Cloning into 'YOU_PROJECT'...
# Enter passphrase for key '~/.ssh/id_ed25519':
# remote: Enumerating objects: 412, done.
# remote: Counting objects: 100% (412/412), done.
# remote: Compressing objects: 100% (182/182), done.
# remote: Total 412 (delta 155), reused 412 (delta 155)
# Receiving objects: 100% (412/412), 891.35 KiB | 15.37 MiB/s, done.
# Resolving deltas: 100% (155/155), done.