Re: /bin/sh diversions
On Fri, Aug 03, 2007 at 06:24:52PM +0200, Pierre Habouzit <madcoder@debian.org> wrote:
> On Fri, Aug 03, 2007 at 01:15:38PM +1000, Anthony Towns wrote:
> > On Wed, Aug 01, 2007 at 10:13:38PM -0700, Steve Langasek wrote:
> > > On Thu, Aug 02, 2007 at 06:54:49AM +0200, Mike Hommey wrote:
> > > > diversions are far from being atomic.
> > > True, but it is persistent across upgrades and doesn't require any
> > > particular support from the package.
> >
> > Is it a bug (or a missing feature) that diversions aren't atomic?
> >
> > The --rename option to dpkg-divert means it can be done atomically if
> > dpkg-divert is clever enough, at least in all the ways that count.
>
> what is not atomic is that dpkg-divert will rename /bin/sh as
> /bin/sh.real or whatever, and then the postinst will recreate the
> symlink. Between those operations, you live without /bin/sh.
>
> dpkg-divert could make that atomicaly if it had an option
> --replace-with which would take the name of the file to divert _and_ the
> file to replace it with.
>
> That way, the diversion can be made with always a /bin/sh, if
> dpkg-divert does that:
>
> ln /bin/sh /bin/sh.distrib
> mv /bin/dash.temporary /bin/sh
>
> having /bin/dash.temporary created before the call to dpkg-divert.
> Sadly, afaict, there is no such option in dpkg-divert yet.
>
> Of course this would impose that all the arguments live in the same
> directory (as they must be on the same device).
>
> OTOH I'm not sure it's worth the hassle.
Wasn't there a discussion a few weeks ago about having diversions be
handled by dpkg directly, through a diversions file in the package
control.tar.gz ? Or was it alternatives ?
Mike
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