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From Daniel Shahaf <...@daniel.shahaf.name>
Subject Re: svn commit: r1040831 - in /subversion/trunk/subversion: include/svn_checksum.h libsvn_subr/checksum.c
Date Thu, 02 Dec 2010 05:51:31 GMT
Stefan Fuhrmann wrote on Thu, Dec 02, 2010 at 01:39:34 +0100:
> On 01.12.2010 04:25, Daniel Shahaf wrote:
>> stefan2@apache.org wrote on Tue, Nov 30, 2010 at 23:56:41 -0000:
>>> Author: stefan2
>>> Date: Tue Nov 30 23:56:40 2010
>>> New Revision: 1040831
>>>
>>> URL: http://svn.apache.org/viewvc?rev=1040831&view=rev
>>> Log:
>>> Fix 'svnadmin verify' for format 5 repositories. During the checking process,
>>> they yield NULL for SHA1 checksums. The most robust way to fix that is to
>>> allow NULL for checksum in svn_checksum_to_cstring. This seems justified
>>> as NULL is already a valid return value instead of e.g. an empty string. So,
>>> callers may receive NULL as result and could therefore assume that NULL is
>>> a valid input, too
>>>
>> Can you explain how to trigger the bug you are fixing?  Just running
>> 'svnadmin verify' on my r1040058-created Greek repository doesn't.
> Sure:
>
> $svnadmin-1.5.4 create /mnt/svnroot/test
> $<add pre-revprop-change hook>
> $svnsync-1.5.4 init file:///mnt/svnroot/test http://svn.apache.org/repos/asf
> $svnsync-1.5.4 sync file:///mnt/svnroot/test
> $<cancel after a few revs; rev 1 will already trigger the error>
> $svnadmin-trunk verify /mnt/svnroot/test

And then the dump logic calls svn_fs_file_checksum(force=FALSE), which
causes a NULL checksum to be returned.

Thanks for the recipe; knowing it it's easier to review the fix.

Daniel

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