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----
-breadcrumbs:
-- - /chromium-os
-  - Chromium OS
-- - /chromium-os/how-tos-and-troubleshooting
-  - How Tos and Troubleshooting
-page_name: creating-local-mirrors
-title: Creating Local Mirrors
----
-
-[TOC]
-
-## Background
-
-While git works great for keeping things up-to-date and for speeding up network
-transfers (when you need to pull in new commits), the sheer size of the
-ChromiumOS repository is still a hurdle for many groups. Your company might not
-have the greatest connection to the machine where the repositories are hosted,
-or perhaps even your region or country have bottlenecks our of your control. In
-these cases, you probably don't want all of the engineers in your company doing
-the same multi-gigabyte repository mirroring on their various machines as this
-can prohibitively slow to development. Especially if something goes wrong and
-they want to create a fresh checkout!
-
-Have no fear though, it is easy to create your own local mirror of the Chromium
-OS repository, keep it up-to-date, and have all local people pull from that. And
-for those people who want to contribute back, it's easy to do that too!
-
-## Overview
-
-You will need one machine that has a public network connection (for fetching
-updates from the Chromium OS repository), as well as running a git service (so
-your local people can then mirror from your system). While a dedicated machine
-is obviously recommended (as the machine will be seeing a lot of network and
-disk traffic), an existing system will suffice.
-
-You will not need root as all of the operations can be run as a normal user.
-
-## Helper Script
-
-Rather than having to maintain the mirror manually, we've written a script that
-should automate things for you. To fetch it:
-
-```none
-wget 'https://chromium.googlesource.com/chromiumos/chromite/+/HEAD/scripts/cros_mirror?format=text' -O - | base64 -d > cros_mirror
-chmod a+rx cros_mirror
-```
-
-## Server Setup
-
-You will need two bits of information:
-
-*   Where to store all the code (many gigabytes)
-*   How to serve the data to local users
-
-Let's assume you're going to store the code in /home/cros/mirror/ and run a
-local git repo from a machine known as "local-cros-mirror". Pick any other
-settings you like.
-
-## Initial Sync
-
-The first transfer of source code will take a while (depending on the speed of
-your connection to our servers) as it will be fetching many gigabytes of data.
-
-```none
-./cros_mirror -r /home/cros/mirror -u git://local-cros-mirror
-```
-
-Once that finishes, you're ready to start serving up data!
-
-## Keeping up-to-date
-
-You can put this command into a cronjob to keep the tree up-to-date:
-
-```none
-./cros_mirror -r /home/cros/mirror
-```
-
-It should automatically load the previous settings, and be race free from other
-users pulling from it simultaneously.
-
-## Example Server Usage
-
-With these example settings, you could launch a git instance (as any user who
-has read access to the mirror dir, so doesn't require root) like so:
-
-```none
-git daemon --base-path=/home/cros/mirror/ --export-all
-```
-
-And then your users could pull from it like so:
-
-```none
-repo init -u git://local-cros-mirror/chromiumos/manifest.git --repo-url=git://local-cros-mirror/external/repo.git
-```
-
-## Alternative Client Usage (git insteadOf)
-
-The helper script works by rewriting the manifest on the fly to point to the
-local system. Clients can support this locally without needing to use the
-rewritten manifest by using the insteadOf config.
-
-```none
-git config "url.git://local-cros-mirror.insteadOf" "https://git.chromium.org/git"
-```
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