Migrate git repository to GitLab using the command line

• Create a new EMPTY repository in GitLab. (Note: You MUST uncheck "Initialize repository with README")
• Clone from the source remote repository (from e.g. BitBucket, Github):

  git clone --mirror git@bitbucket.org:path/to/REPO.git

• Push the local repository to GitLab:

  cd REPO.git
  git push --mirror git@gitlab.com:path/to/REPO.git

see also

• Importing a Git repository using the command line