GitLab Server custom_hooks for deleting LFS Objects

Current version of GitLab does not delete LFS objects from LFS storage. This custom hook deletes the LFS Objects from storage when a LFS file is deleted and pushed to the git server

Setup

Gitlab custom hooks setup is at https://docs.gitlab.com/ee/administration/custom_hooks.html

Quick run through the process on GitLab server:

• Edit LFSObjectExtensions in post-receive file to the LFS extensions you are tracking.
  Should be the same as the files in your .gitattributes

• Edit LFSStoragePath in post-receive file. This value should match your server value for gitlab_rails['lfs_storage_path'] in /etc/gitlab/gitlab.rb
  https://docs.gitlab.com/ee/workflow/lfs/lfs_administration.html

• Files need to be in the following location (path is for a standard GitLab install)

/var/opt/gitlab/git-data/repositories/<your-username>/<your_lfs_repo>.git/custom_hooks

• Please make git the owner of the directory and the scripts in it should be executable.

chown -R git:git /var/opt/gitlab/git-data/repositories/<your-username>/<your_lfs_repo>.git/custom_hooks
chmod -R +x /var/opt/gitlab/git-data/repositories/<your-username>/<your_lfs_repo>.git/custom_hook