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Restore corrupted revision from backup

From: Marco Eckstein <marco.eckstein_at_charite.de>
Date: Tue, 16 Jun 2009 14:52:45 +0200

Hi everybody,

assume the following situation:

-Subversion server version is 1.3.x
-FSFS backend
-Windows XP
-Exactly one revision is corrupted. This can be found out by using
svnadmin verify -r 0:NumberOfCorruptedRevision and svnadmin verify -r
NumberOfCorruptedRevision+1:HEAD, executed on a copy of the repository
and Subversion 1.5.
-A backup of an uncorrupted repository including revision
NumberOfCorruptedRevision exists.

Consider the following attempt to repair the repository:

-Temporarily disable all Subversion client access to the repository
-Overwrite the file myRepository\db\revs\NumberOfCorruptedRevision with
myRepositoryBackup\db\revs\NumberOfCorruptedRevision

Is this the correct way to restore a corrupted revision?

Unfortunately, I found no definite answer to that question, just a vague
statement in the book "Version Control with Subversion" (for Subversion
1.5) on page 314 about svnadmin verify which states: "If this command
fails (...) that means your repository has at least one corrupted
revision, and you should restore the corrupted revision from a backup (...)"

The approach definitely SEEMS to work, which can be seen when testing it
and running a successful svnadmin verify. However, I want to be sure
that there are no ill effects. After all I do not know how svnadmin
verify works in detail and how much it can be trusted.

Thank you
Marco

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Received on 2009-06-16 14:57:32 CEST

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