CedarBackup2.extend.subversion

Package CedarBackup2 :: Package extend :: Module subversion

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Module CedarBackup2.extend.subversion

Provides an extension to back up Subversion databases.

This is a Cedar Backup extension used to back up Subversion repositories via the Cedar Backup command line. It requires a new configurations section <subversion> and is intended to be run either immediately before or immediately after the standard collect action. Aside from its own configuration, it requires the options and collect configuration sections in the standard Cedar Backup configuration file.

There are two different kinds of Subversion repositories at this writing: BDB (Berkeley Database) and fsfs (a more CVS-like "filesystem within a filesystem"). I personally only use the BDB version, because when I started using Subversion, that's all there was. This extension only backs up BDB repositories. If I ever start using fsfs, I'll add another function to back up that kind of repository as well. (Feel free to contribute code if you would like to see fsfs supported.)

Each repository can be backed using the same collect modes allowed for filesystems in the standard Cedar Backup collect action: weekly, daily, incremental.

Author: Kenneth J. Pronovici <pronovic@ieee.org>

Classes
`BDBRepository`	Class representing Subversion BDB (Berkeley Database) repository configuration.
`LocalConfig`	Class representing this extension's configuration document.
`Repository`	Class representing generic Subversion repository configuration..
`SubversionConfig`	Class representing Subversion configuration.

Function Summary
	`backupBDBRepository(repositoryPath, backupFile, startRevision, endRevision)` Backs up an individual Subversion BDB repository.
	`executeAction(configPath, options, config)` Executes the Subversion backup action.
	`getYoungestRevision(repositoryPath)` Gets the youngest (newest) revision in a Subversion repository using `svnlook`.

Function Details

backupBDBRepository(repositoryPath, backupFile, startRevision=None, endRevision=None)

Backs up an individual Subversion BDB repository.

The starting and ending revision values control an incremental backup. If the starting revision is not passed in, then revision zero (the start of the repository) is assumed. If the ending revision is not passed in, then the youngest revision in the database will be used as the endpoint.

The backup data will be written into the passed-in back file. Normally, this would be an object as returned from open, but it is possible to use something like a GzipFile to write compressed output. The caller is responsible for closing the passed-in backup file.

Parameters:: repositoryPath - Path to Subversion repository to back up
(type=String path representing Subversion BDB repository on disk.); backupFile - Python file object to use for writing backup.
(type=Python file object as from open() or file().); startRevision - Starting repository revision to back up (for incremental backups)
(type=Integer value >= 0.); endRevision - Ending repository revision to back up (for incremental backups)
(type=Integer value >= 0.)

Raises:: ValueError - If some value is missing or invalid.; IOError - If there is a problem executing the MySQL dump.

Notes:

This function should either be run as root or as the owner of the Subversion repository.
It is apparently not a good idea to interrupt this function. Sometimes, this leaves the repository in a "wedged" state, which requires recovery using svnadmin recover.

executeAction(configPath, options, config)

Executes the Subversion backup action.

Parameters:: configPath - Path to configuration file on disk.
(type=String representing a path on disk.); options - Program command-line options.
(type=Options object.); config - Program configuration.
(type=Config object.)

Raises:: ValueError - Under many generic error conditions; IOError - If a backup could not be written for some reason.

getYoungestRevision(repositoryPath)

Gets the youngest (newest) revision in a Subversion repository using svnlook.

Parameters:: repositoryPath - Path to Subversion repository to look in.
(type=String path representing Subversion BDB repository on disk.)

Returns:: Youngest revision as an integer.

Raises:: ValueError - If there is a problem parsing the svnlook output.; IOError - If there is a problem executing the svnlook command.

Note: This function should either be run as root or as the owner of the Subversion repository.

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