git-svn authors file in repo (Author: xxx not defined in .gitauthors file)

> Hello,
> 
> We maintain a .gitauthors file for git-svn.  When a new committer is
> added to our project, a new entry is added to the .gitauthors file,
> but we sometimes see errors like this:
> 
> % git -C /usr/ports svn rebase
>         M       .gitauthors
> r512146 = 0c1f924ca984d53333beabb909ea53afb856c44b (refs/remotes/origin/trunk)
>         M       math/py-pystan/Makefile
> r512147 = acc387d4c8f3ebf904010bccc5679be06b184a9d (refs/remotes/origin/trunk)
>         M       deskutils/gworkspace-gwmetadata/Makefile
> ...
> ...
> ...
> r512184 = 442bd1025776d5e3171be8e497ef2056dc47ff06 (refs/remotes/origin/trunk)
>         M       www/rubygem-passenger/Makefile
>         M       www/rubygem-passenger/distinfo
>         D       www/rubygem-passenger/files/patch-asio-libc++7
> W: -empty_dir: head/www/rubygem-passenger/files/patch-asio-libc++7
> r512185 = f1a1b447811ae84011288678136e185c83180b8e (refs/remotes/origin/trunk)
>         M       astro/xearth/files/freebsd.committers.markers
> Author: dmgk not defined in .gitauthors file
> 
> The new committer, dmgk, was added to .gitauthors in svn commit r512146,
> then later he committed to the repository for the first time in r512185.
> It seems that if these two commits are included in the same `git svn
> rebase`, the error above will occur.
> 
> Is there a solution or workaround for this aside from each committer
> having an updated .gitauthors before doing `git svn rebase`.  It's seems
> to be a chicken/egg issue; they first need the updated .gitauthors file,
> but the way to get the updated .gitauthors files is to do `git svn
> rebase`.

> On Thu, Sep 19, 2019 at 11:34:21AM -0300, Joseph Mingrone wrote:
> > Hello,
> > 
> > We maintain a .gitauthors file for git-svn.  When a new committer is
> > added to our project, a new entry is added to the .gitauthors file,
> > but we sometimes see errors like this:
> > 
> > % git -C /usr/ports svn rebase
> >         M       .gitauthors
> > r512146 = 0c1f924ca984d53333beabb909ea53afb856c44b (refs/remotes/origin/trunk)
> >         M       math/py-pystan/Makefile
> > r512147 = acc387d4c8f3ebf904010bccc5679be06b184a9d (refs/remotes/origin/trunk)
> >         M       deskutils/gworkspace-gwmetadata/Makefile
> > ...
> > ...
> > ...
> > r512184 = 442bd1025776d5e3171be8e497ef2056dc47ff06 (refs/remotes/origin/trunk)
> >         M       www/rubygem-passenger/Makefile
> >         M       www/rubygem-passenger/distinfo
> >         D       www/rubygem-passenger/files/patch-asio-libc++7
> > W: -empty_dir: head/www/rubygem-passenger/files/patch-asio-libc++7
> > r512185 = f1a1b447811ae84011288678136e185c83180b8e (refs/remotes/origin/trunk)
> >         M       astro/xearth/files/freebsd.committers.markers
> > Author: dmgk not defined in .gitauthors file
> > 
> > The new committer, dmgk, was added to .gitauthors in svn commit r512146,
> > then later he committed to the repository for the first time in r512185.
> > It seems that if these two commits are included in the same `git svn
> > rebase`, the error above will occur.
> > 
> > Is there a solution or workaround for this aside from each committer
> > having an updated .gitauthors before doing `git svn rebase`.  It's seems
> > to be a chicken/egg issue; they first need the updated .gitauthors file,
> > but the way to get the updated .gitauthors files is to do `git svn
> > rebase`.
> 
> I have no idea how 'git svn' works and what this '.gitauthors' file
> is, so no workarounds from me...  But this seems to be similar to the
> issue with '.gitattributes' in core Git that was fixed recently:
> 
>   https://public-inbox.org/git/20190902223944.897504-3-sandals@crustytoothpaste.net/
> 
> Perhaps 'git svn rebase' should do the same, i.e. look out for commits
> changing this '.gitauthors' file and re-read the file each time it is
> changed.
> 
> Cc-ing Eric for git-svn know-how.