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@title Diffusion User Guide: Existing Repositories
@group userguide

Quick guide for importing or observing existing repositories.

Overview
========

If you have an existing repository, you can observe or import it into
Diffusion.

Observing a repository creates a read-only copy in Phabricator that is kept
up to date by continuously importing new changes.

Importing a repository creates a read-write copy.

This document is a quick guide to getting started. For an overview of
Diffusion, see @{article:Diffusion User Guide}. For a more detailed guide
about managing repositories and URIs in Diffusion, see
@{article:Diffusion User Guide: URIs}.

Observing Repositories
======================

To observe an existing repository:

- Create a repository in Diffusion, but do not activate it yet.
  - Add the URI for the existing repository you wish to observe in the
    **URIs** section, in **Observe** mode.
  - Activate the repository in Diffusion.

This creates a read-only copy of the repository in Phabricator. Phabricator
will keep its copy in sync with the remote by periodically polling the remote
for changes.

For more details, see @{article:Diffusion User Guide: URIs}.

Importing Repositories
======================

There are two primary ways to import an existing repository:

**Observe First**: In Git or Mercurial, you can observe the repository first.
Once the import completes, change the "I/O Type" on the **Observe** URI to
"No I/O" mode to automatically convert it into a hosted repository.

**Push to Empty Repository**: Create and activate an empty repository, then push
all of your changes to the empty repository.

In Git and Mercurial, you can do this with `git push` or `hg push`.

In Subversion, you can do this with `svnsync`.

For more details, see @{article:Diffusion User Guide: URIs}.

Next Steps
==========

Continue by:

- reading an overview of Diffusion in
    @{article:Diffusion User Guide}; or
  - learning more about managing remote repository URIs in
    @{article:Diffusion User Guide: URIs}.

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