Re: refuse to update certain files upon extraction

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* Message by -Lasse Kliemann- from Tue 2008-03-18:
> * Message by -Joerg Schilling- from Tue 2008-03-18:
> > Lasse Kliemann <[email protected]> wrote:
> >=20
> > > * Message by -Joerg Schilling- from Tue 2008-03-18:
> > >
> > > > The problem is a Linux kernel bug.
> > > >=20
> > > > Any other backup tool (like e.g. dump/restore) will run into the sa=
me problem
> > > > as Linux did not update the timestamp from the directory=20
> > > > "send-backup-test/log/supervise/".
> > > >=20
> > > > You need to send a bug-report against Linux and get a fix for this =
problem....
> > >
> > > I've already prepared a minimal example to prove this, see the attach=
ed=20
> > > files. The ctime of `sub' changes the first time that `rename' is run=
, but=20
> > > not the second. I also tried this on Solaris, and there the ctime is=
=20
> > > updated after the second run of `rename'.
> >=20
> > Do you know whether your original problem was caused by a rename or rat=
her a=20
> > unlink/create chain?
> =20
> It was caused by a rename, as in the attached rename.c (that's the one fr=
om=20
> my old message <[email protected]> and not =
the=20
> one I sent minutes ago).

Oh, of course this also includes unlink and create, I think, for the file is
opened with O_TRUNC and O_CREAT.

By the way, the files you examined show how the problem can be reproduced=
=20
running runsv[1] and not my rename.c. I came up with the rename idea after=
=20
looking at the source code of runsv.

[1] http://smarden.org/runit/


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