Re: [Qemu-devel] [PATCH v6 0/4] 9p: Fix file ID collisions

[Christian Schoenebeck via <qemu-devel@nongnu.org>]

On Donnerstag, 5. September 2019 14:59:31 CEST Greg Kurz wrote:
> On Thu, 05 Sep 2019 14:25:13 +0200
> 
> Christian Schoenebeck <qemu_oss@crudebyte.com> wrote:
> > On Mittwoch, 4. September 2019 15:02:30 CEST Christian Schoenebeck wrote:
> > > > > Well, mailman is handling this correctly. It replaces the "From:"
> > > > > field
> > > > > with a placeholder and instead adds my actual email address as
> > > > > "Reply-To:" field. That's the common way to handle this on mailing
> > > > > lists,
> > > > > as also mentioned here:
> > > > > https://en.wikipedia.org/wiki/DMARC#From:_rewriting
> > > > > 
> > > > > So IMO patchew should automatically use the value of "Reply-To:" in
> > > > > that
> > > > > case as author of patches instead.
> > > > > 
> > > > > Reducing security cannot be the solution.
> > > > 
> > > > No, there's no need to reduce security.  Just change your local git
> > > > configuration to produce a 'From:' line in the commit body..
> > > 
> > > Got it. :)
> > > 
> > > > >> How are you sending patches ? With git send-email ? If so, maybe
> > > > >> you
> > > > >> can
> > > > >> pass something like --from='"Christian Schoenebeck"
> > > > >> <qemu_oss@crudebyte.com>'. Since this is a different string, git
> > > > >> will
> > > > >> assume you're sending someone else's patch : it will automatically
> > > > >> add
> > > > >> an
> > > > >> extra From: made out of the commit Author as recorded in the git
> > > > >> tree.
> > > > 
> > > > I think it is probably as simple as a 'git config' command to tell git
> > > > to always put a 'From:' in the body of self-authored patches when
> > > > using
> > > > git format-patch; however, as I don't suffer from munged emails, I
> > > > haven't actually tested what that setting would be.
> > 
> > Well, I tried that Eric. The expected solution would be enabling this git
> > setting:
> > 
> > git config [--global] format.from true
> > https://git-scm.com/docs/git-config#Documentation/git-config.txt-formatfro
> > m
> > 
> > But as you can already read from the manual, the overall behaviour of git
> > regarding a separate "From:" line in the email body was intended solely
> > for
> > the use case sender != author. So in practice (at least in my git version)
> > git always makes a raw string comparison between sender (name and email)
> > string and author string and only adds the separate From: line to the
> > body if they differ.
> > 
> > Hence also "git format-patch --from=" only works here if you use a
> > different author string (name and email) there, otherwise on a perfect
> > string match it is simply ignored and you end up with only one "From:" in
> > the email header.
> > 
> > So eventually I added one extra character in my name for now and removed
> > it
> > manually in the dumped emails subsequently (see today's
> > "[PATCH v7 0/3] 9p: Fix file ID collisions").
> 
> Hence my proposal in some other mail to pass a different string to
> git send-email, but I guess this also works for git format-patch.
> 
> eg, adding double quotes around your "firstname name"
> 
>  --from='"Christian Schoenebeck" <qemu_oss@crudebyte.com>'

Yeah, I will use that for now, since it just works^TM (I tested it).

Because for some reason my emails are still mangled on this list. Probably I 
still have to drop more header fields from dkim's "h=..." setting. We'll see.