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Proposal: Light weight checkout for shadow copies

From: Bruno Gustavs <bg2svn_at_yahoo.de>
Date: 2005-09-15 14:09:19 CEST

Requirement
-----------
 
Sometimes it is very handy to have a shadow copy of the last commited
or released version on a file server for simple access.
There exist unversioned files e.g. 3rd party software that should coexist
on the shadow directory.
 
Current Solutions
-----------------
 
To create and update a shadow copy of a repository folder there are mainly
three possibilities:
 
1) Export
Init: Export directory from repository.
Update: Remove old shadow directory, export directory from repository.
 
Advantage: No overhead
Drawback: Takes some time.
           Versioned and unversioned files cannot coexist on the shadow.
           There are problems with locked files.
 
2) Working Copy
Init: Checkout directory from repository.
Update: Update shadow working copy (e.g. from post-commit script)
 
Advantage: Easy to implement
           Differential update, i.e. fast
Drawback: Overhead in disk space (factor 2 or more)
           Users can use shadow as working copy which leads to
           unpredictable results on network shares.
 
3) Update Script
Write a script to parse the output of 'svnlook -r <rev> changed' and
update the required files only. Such a script has been published by
Nathaniel Case on 2005-06-01.
 
Advantage: No overhead
           Differential update, i.e. fast
           Unversioned files can coexist in shadow directory.
Drawback: Rewrite svn co functionality in script
 
Proposal
--------
 
Provide a lightweight checkout command that works like checkout
except:
- There is no copy of the base version in the .svn directory.
- The working copy is readonly.
- Modifying such a working copy is prevented by all svn commands.
 
Advantage: No overhead (except some accounting information)
           Differential updates, i.e. fast
           Unversioned and versioned files can coexist.
           Reuse of existing Subversion code.
 
Looking forward for comments!
 
Best Regards
Bruno

 

                
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Received on Thu Sep 15 14:11:55 2005

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