Re: Discrepancies in svn mirror created with svnsync

On Sat, Feb 09, 2013 at 11:31:07AM +0100, Andreas Mohr wrote:
> Hi,
>
> On Fri, Feb 08, 2013 at 03:45:29PM +0100, Stefan Sperling wrote:
> > I cannot tell you what happened here and why the revisions in the
> > mirro are empty. That sure is concerning.
> >
> > However there are known race conditions in svnsync in Subversion 1.6.
> > See http://subversion.apache.org/docs/release-notes/1.7.html#atomic-revprops
> >
> > So you should definitely wrap svnsync in a tool like lockfile (part of
> > procmail), or upgrade to 1.7.

I went with

  #!/bin/sh
  lockfile -r500 /stuff/zope-mirror/locks/ADHOC.lock || exit 1
  /usr/bin/sudo -u syncuser /usr/bin/svnsync sync file:///stuff/zope-mirror
  rm -f /stuff/zope-mirror/locks/ADHOC.lock

> Be careful about "solutions" other than lockfile - some of these appear to be
> terribly unsafe (some newer Ubuntu-introduced "atomic locking" package
> comes to mind - which then executes anyway after a measly timeout!).

Do you remember the name of the package?

Anyway, this takes care of prevention. What about recovery? Can I fix
the three missing revisions manually somehow? Or at least truncate my
mirror's history to that point so that I could run svnsync to get just
the last month and a half, instead of re-creating the mirror from
scratch?

Marius Gedminas

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