Concurrent commits and post-commit hooks

[Ken Miller <kl...@shetlandsoftware.com>]

I'm in the process of setting up a SVN repository to replace a medium 
sized CVS repository.  No major issues yet, and I'm *very* impressed 
with the stability and functionality of Subversion.  Kudos to the 
developers for a great tool!

One of the features I'm trying to exploit is the post-commit hook to 
create incremental backups on the fly.  Effectively, something like this:

    svnadmin dump $1 --revision $2 --incremental >> date-stamped-file

I have a couple of questions:

1. Does SVN enforce the running order of post-commit hooks in revision 
number sequence?  If two developers commit changes to the repository 
creating revisions 1 and 2 respectively, does SVN *always* run the 
post-commit hook for revision 1, and then for revision 2?

2. When restoring a Subversion repository, does the backup file need to 
be in revision number order?  Or, put a different way, does the restore 
process the restore in revision number order or file order?  If 
subversion processes the file in revision number order, then #1 is not 
an issue.

I have searched the archives, but I've not found very much information 
on post-commit hooks, hence my question here.

Cheers!

    -klm.



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Re: Concurrent commits and post-commit hooks

[Ken Miller <kl...@shetlandsoftware.com>]

Ken Miller wrote:

> I'm in the process of setting up a SVN repository to replace a medium 
> sized CVS repository.  No major issues yet, and I'm *very* impressed 
> with the stability and functionality of Subversion.  Kudos to the 
> developers for a great tool!
>
> One of the features I'm trying to exploit is the post-commit hook to 
> create incremental backups on the fly.  Effectively, something like this:
>
>    svnadmin dump $1 --revision $2 --incremental >> date-stamped-file
>
> I have a couple of questions:
>
> 1. Does SVN enforce the running order of post-commit hooks in revision 
> number sequence?  If two developers commit changes to the repository 
> creating revisions 1 and 2 respectively, does SVN *always* run the 
> post-commit hook for revision 1, and then for revision 2?

I hate answering my own questions, but I may as well for posterity :-)

The answer to #1 is no, Subversion does not enforce revision number 
sequencing of the execution of post-commit hooks.

> 2. When restoring a Subversion repository, does the backup file need 
> to be in revision number order?  Or, put a different way, does the 
> restore process the restore in revision number order or file order?  
> If subversion processes the file in revision number order, then #1 is 
> not an issue.

I'm still investigating this one...

    -klm.


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