Svn sync – Mirroring a Subversion Repository

Mirroring a Subversion Repository

As of version 1.4, Subversion provides an “svnsync” utility that may be used to create a mirror of a repository. It should be used only for read-only mirrors — it will break if any changes are committed in the target repository that were not made in the source repository. This is primarily useful for backup purposes, or for creating a local mirror used by clients that have no intention of checking in changes, as it is not a trivial operation to check out from one repository and commit to another and it requires manipulation of the mirror repository.

To create a new Subversion repository that is a mirror of an existing repository, do the following:

• Create a new filesystem directory that will be used to hold the mirror, like:

$ mkdir /mirror/subversion

• Use the svnadmin utility to create a new repository within that directory, like:

$ svnadmin create /mirror/subversion/OpenDS

• The mirror repository must be configured to allow revision properties, and it should only allow those changes by the “svnsync” user, which can be done by creating a “hooks/pre-revprop-change” file in that repository with the execute permission set and with the following contents:

#!/bin/sh

if [ "$3" = "guest" ]; then exit 0; fi

echo "Only the guest user may edit revision properties through svnsync" >&2
exit 1

• Initialize the mirror repository using the “svnsync init” command, like:

svnsync init --username guest file:///mirror/subversion/OpenDS https://opends.dev.java.net/svn/opends

• Use the “svnsync sync” command to populate the mirror repository, like:

svnsync sync file:///mirror/subversion/OpenDS

• To keep the mirror up to date, periodically re-issue the above “svnsync sync” command (e.g., using a cron job).

See http://svn.collab.net/repos/svn/trunk/notes/svnsync.txt for more information on the svnsync utility.

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