The Subversion Extension is a Cedar Backup extension used to back up Subversion [23] version control repositories via the Cedar Backup command line. It is intended to be run either immediately before or immediately after the standard collect action.
Each configured Subversion repository can be backed using the same collect modes allowed for filesystems in the standard Cedar Backup collect action (weekly, daily, incremental) and the output can be compressed using either gzip or bzip2.
There are two different kinds of Subversion repositories at this writing: BDB (Berkeley Database) and FSFS (a "filesystem within a filesystem"). This extension backs up both kinds of repositories in the same way, using svnadmin dump in an incremental mode.
It turns out that FSFS repositories can also be backed up just like any other filesystem directory. If you would rather do the backup that way, then use the normal collect action rather than this extension. If you decide to do that, be sure to consult the Subversion documentation and make sure you understand the limitations of this kind of backup.
To enable this extension, add the following section to the Cedar Backup configuration file:
<extensions>
<action>
<name>subversion</name>
<module>CedarBackup2.extend.subversion</module>
<function>executeAction</function>
<index>99</index>
</action>
</extensions>
This extension relies on the options and collect configuration
sections in the standard Cedar Backup configuration file, and then
also requires its own subversion configuration
section. This is an example Subversion configuration section:
<subversion>
<collect_mode>incr</collect_mode>
<compress_mode>bzip2</compress_mode>
<repository>
<abs_path>/opt/public/svn/docs</abs_path>
</repository>
<repository>
<abs_path>/opt/public/svn/web</abs_path>
<compress_mode>gzip</compress_mode>
</repository>
<repository_dir>
<abs_path>/opt/private/svn</abs_path>
<collect_mode>daily</collect_mode>
</repository_dir>
</subversion>
The following elements are part of the Subversion configuration section:
collect_modeDefault collect mode.
The collect mode describes how frequently a Subversion repository is backed up. The Subversion extension recognizes the same collect modes as the standard Cedar Backup collect action (see Chapter 2, Basic Concepts).
This value is the collect mode that will be used by default during the backup process. Individual repositories (below) may override this value. If all individual repositories provide their own value, then this default value may be omitted from configuration.
Note: if your backup device does not suppport multisession
discs, then you should probably use the
daily collect mode to avoid losing
data.
Restrictions: Must be one of
daily, weekly or
incr.
compress_modeDefault compress mode.
Subversion repositories backups are just specially-formatted text files, and often compress quite well using gzip or bzip2. The compress mode describes how the backed-up data will be compressed, if at all.
This value is the compress mode that will be used by default during the backup process. Individual repositories (below) may override this value. If all individual repositories provide their own value, then this default value may be omitted from configuration.
Restrictions: Must be one of
none, gzip or
bzip2.
repositoryA Subversion repository be collected.
This is a subsection which contains information about a specific Subversion repository to be backed up.
This section can be repeated as many times as is necessary. At least one repository or repository directory must be configured.
The repository subsection contains the
following fields:
collect_modeCollect mode for this repository.
This field is optional. If it doesn't exist, the backup will use the default collect mode.
Restrictions: Must be one of
daily, weekly or
incr.
compress_modeCompress mode for this repository.
This field is optional. If it doesn't exist, the backup will use the default compress mode.
Restrictions: Must be one of
none, gzip or
bzip2.
abs_pathAbsolute path of the Subversion repository to back up.
Restrictions: Must be an absolute path.
repository_dirA Subversion parent repository directory be collected.
This is a subsection which contains information about a Subversion parent repository directory to be backed up. Any subdirectory immediately within this directory is assumed to be a Subversion repository, and will be backed up.
This section can be repeated as many times as is necessary. At least one repository or repository directory must be configured.
The repository_dir subsection contains the
following fields:
collect_modeCollect mode for this repository.
This field is optional. If it doesn't exist, the backup will use the default collect mode.
Restrictions: Must be one of
daily, weekly or
incr.
compress_modeCompress mode for this repository.
This field is optional. If it doesn't exist, the backup will use the default compress mode.
Restrictions: Must be one of
none, gzip or
bzip2.
abs_pathAbsolute path of the Subversion repository to back up.
Restrictions: Must be an absolute path.
excludeList of paths or patterns to exclude from the backup.
This is a subsection which contains a set of paths and patterns to be excluded within this subversion parent directory.
This section is entirely optional, and if it exists can also be empty.
The exclude subsection can contain one or more of each of the following fields:
rel_pathA relative path to be excluded from the backup.
The path is assumed to be relative to the
subversion parent directory itself. For instance, if
the configured subversion parent directory is
/opt/svn a
configured relative path of
software would exclude the
path /opt/svn/software.
This field can be repeated as many times as is necessary.
Restrictions: Must be non-empty.
patternA pattern to be excluded from the backup.
The pattern must be a Python regular
expression. [19]
It is assumed to be bounded at front and
back by the beginning and end of the
string (i.e. it is treated as if it
begins with ^ and
ends with $).
This field can be repeated as many times as is necessary.
Restrictions: Must be non-empty