Add tutorial - migrate repo to LFS
- Link new doc to and from other docs - Add tbs section
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Marcia Ramos
Evan Read
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@ -82,6 +82,8 @@ Git-related queries from GitLab.
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The following relate to Git Large File Storage:
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- [Getting Started with Git LFS](https://about.gitlab.com/2017/01/30/getting-started-with-git-lfs-tutorial/)
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- [GitLab Git LFS documentation](../../workflow/lfs/manage_large_binaries_with_git_lfs.md)
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- [Migrate an existing Git repo with Git LFS](migrate_to_git_lfs/index.md)
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- [GitLab Git LFS user documentation](../../workflow/lfs/manage_large_binaries_with_git_lfs.md)
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- [GitLab Git LFS admin documentation](../../workflow/lfs/lfs_administration.md)
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- [Git-Annex to Git-LFS migration guide](../../workflow/lfs/migrate_from_git_annex_to_git_lfs.md)
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- [Towards a production quality open source Git LFS server](https://about.gitlab.com/2015/08/13/towards-a-production-quality-open-source-git-lfs-server/)
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@ -0,0 +1,174 @@
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---
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type: tutorial, concepts
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description: "How to migrate an existing Git repository to Git LFS with BFG."
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last_updated: 2019-07-11
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---
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# Migrate a Git repo into Git LFS with BFG
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Using Git LFS can help you to reduce the size of your Git
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repository and improve its performance.
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However, simply adding the
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large files that are already in your repository to Git LFS,
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will not actually reduce the size of your repository because
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the files are still referenced by previous commits.
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Through the method described on this document, first migrate
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to Git LFS with [BFG](https://rtyley.github.io/bfg-repo-cleaner/)
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through a mirror repo, then clean up the repository's history,
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and lastly create LFS tracking rules to prevent new binary files
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from being added.
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This tutorial was inspired by the guide
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[Use BFG to migrate a repo to Git LFS](https://confluence.atlassian.com/bitbucket/use-bfg-to-migrate-a-repo-to-git-lfs-834233484.html).
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For more information on Git LFS, see the [references](#references)
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below.
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CAUTION: **Warning:**
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The method described on this guide rewrites Git history. Make
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sure to back up your repo before beginning and use it at your
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own risk.
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## Requirements
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Before beginning, make sure:
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- You have enough LFS storage for the files you want to convert.
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Storage is required for the entire history of all files.
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- All the team members you share the repository with have pushed all changes.
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Branches based on the repository before applying this method cannot be merged.
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Branches based on the repo before applying this method cannot be merged.
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To follow this tutorial, you'll need:
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- Maintainer permissions to the existing Git repository
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you'd like to migrate to LFS with access through the command line.
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- [Git](https://git-scm.com/book/en/v2/Getting-Started-Installing-Git)
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and [Java Runtime Environment](https://www.java.com/en/download/manual.jsp)
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(Java 7 or above) installed locally.
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- BFG installed locally:
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```bash
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brew install bfg
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```
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- Git LFS installed locally:
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```bash
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brew install git-lfs
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```
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NOTE: **Note:**
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This guide was tested on macOS Mojave.
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## Steps
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Consider an example upstream project, `git@gitlab.com:gitlab-tests/test-git-lfs-repo-migration.git`.
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1. Back up your repository:
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Create a copy of your repository so that you can
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recover it in case something goes wrong.
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1. Clone `--mirror` the repo:
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Cloning with the mirror flag will create a bare repository.
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This ensures you get all the branches within the repo.
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It creates a directory called `<repo-name>.git`
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(in our example, `test-git-lfs-repo-migration.git`),
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mirroring the upstream project:
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```bash
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git clone --mirror git@gitlab.com:gitlab-tests/test-git-lfs-repo-migration.git
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```
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1. Convert the Git history with BFG:
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```bash
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bfg --convert-to-git-lfs "*.{png,mp4,jpg,gif}" --no-blob-protection test-git-lfs-repo-migration.git
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```
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It is scanning all the history, and looking for any files with
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that extension, and then converting them to an LFS pointer.
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1. Clean up the repository:
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```bash
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# cd path/to/mirror/repo:
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cd test-git-lfs-repo-migration.git
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# clean up the repo:
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git reflog expire --expire=now --all && git gc --prune=now --aggressive
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```
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You can also take a look on how to further [clean the repo](../../../user/project/repository/reducing_the_repo_size_using_git.md),
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but it's not necessary for the purposes of this guide.
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1. Install Git LFS in the mirror repository:
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```bash
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git lfs install
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```
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1. [Unprotect the default branch](../../../user/project/protected_branches.md),
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so that we can force-push the rewritten repository:
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1. Navigate to your project's **Settings > Repository** and
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expand **Protected Branches**.
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1. Scroll down to locate the protected branches and click
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**Unprotect** the default branch.
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1. Force-push to GitLab:
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```bash
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git push --force
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```
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1. Track the files you want with LFS:
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```bash
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# cd path/to/upstream/repo:
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cd test-git-lfs-repo-migration
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# You may need to reset your local copy with upstream's `master` after force-pushing from the mirror:
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git reset --hard origin/master
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# Track the files with LFS:
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git lfs track "*.gif" "*.png" "*.jpg" "*.psd" "*.mp4" ".gitattributes" "img/"
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```
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Now all existing the files you converted, as well as the new
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ones you add, will be properly tracked with LFS.
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1. [Re-protect the default branch](../../../user/project/protected_branches.md):
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1. Navigate to your project's **Settings > Repository** and
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expand **Protected Branches**.
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1. Select the default branch from the **Branch** dropdown menu,
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and set up the
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**Allowed to push** and **Allowed to merge** rules.
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1. Click **Protect**.
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<!-- ## Troubleshooting
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Include any troubleshooting steps that you can foresee. If you know beforehand what issues
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one might have when setting this up, or when something is changed, or on upgrading, it's
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important to describe those, too. Think of things that may go wrong and include them here.
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This is important to minimize requests for support, and to avoid doc comments with
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questions that you know someone might ask.
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Each scenario can be a third-level heading, e.g. `### Getting error message X`.
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If you have none to add when creating a doc, leave this section in place
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but commented out to help encourage others to add to it in the future. -->
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## References
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- [Getting Started with Git LFS](https://about.gitlab.com/2017/01/30/getting-started-with-git-lfs-tutorial/)
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- [Migrate from Git Annex to Git LFS](../../../workflow/lfs/migrate_from_git_annex_to_git_lfs.md)
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- [GitLab's Git LFS user documentation](../../../workflow/lfs/manage_large_binaries_with_git_lfs.md)
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- [GitLab's Git LFS administrator documentation](../../../workflow/lfs/lfs_administration.md)
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- Alternative method to [migrate an existing repo to Git LFS](https://github.com/git-lfs/git-lfs/wiki/Tutorial#migrating-existing-repository-data-to-lfs)
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<!--
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Test project:
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https://gitlab.com/gitlab-tests/test-git-lfs-repo-migration
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-->
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@ -84,6 +84,10 @@ that are on the remote repository, eg. for a branch from origin:
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git lfs fetch origin master
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```
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### Migrate an existing repo to Git LFS
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Read the documentation on how to [migrate an existing Git repo with Git LFS](../../topics/git/migrate_to_git_lfs/index.md).
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## File Locking
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> [Introduced](https://gitlab.com/gitlab-org/gitlab-ce/issues/35856) in GitLab 10.5.
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