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

[Eric Blake]

[adding git list]

On 9/5/19 7:25 AM, Christian Schoenebeck wrote:

>>>>> How are you sending patches ? With git send-email ? If so, maybe you
>>>>> can
>>>>> pass something like --from='"Christian Schoenebeck"
>>>>> <address@hidden>'. 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-formatfrom
> 
> 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.

git folks:

How hard would it be to improve 'git format-patch'/'git send-email' to
have an option to ALWAYS output a From: line in the body, even when the
sender is the author, for the case of a mailing list that munges the
mail headers due to DMARC/DKIM reasons?

> 
> 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").
> 
> Besides that direct string comparison restriction; git also seems to have a 
> bug here. Because even if you have sender != author, then git falsely uses 
> author as sender of the cover letter, whereas the emails of the individual 
> patches are encoded correctly.

At any rate, I'm glad that you have figured out a workaround, even if
painful, while we wait for git to provide what we really need.


-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org

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