short version:
I think I managed to extract exactly what we wanted:
https://github.com/hboutemy/maven-build-cache-extension-shallow-filtered
please review and confirm the result is ok


longer version: how was it done?
the first recipe I found is to drop old history:

git clone https://github.com/hboutemy/maven-build-cache-extension.git shallow 
--shallow-since=2021-10-18
cd shallow
git filter-branch -- --all

you can see the intermediate result in 
https://github.com/hboutemy/maven-build-cache-extension-shallow

then I just filtered with "git filter-repo" to remove globally many files that 
were removed in 
https://github.com/hboutemy/maven-build-cache-extension-shallow/commit/a323d9859f091cdd8a2b946c71d12228ec29b70c


Regards,

Hervé

Le dimanche 19 décembre 2021, 22:56:56 CET Hervé BOUTEMY a écrit :
> I've tried to use git filter-repo, excluding unwanted directories or
> extensions
> 
> here is a sample result:
> https://github.com/hboutemy/maven-build-cache-extension-filtered
> = 4200 commits
> 
> instead of initial 11700
> https://github.com/hboutemy/maven-build-cache-extension
> 
> we can still improve the list of directories to exclude
> 
> before taking time for that, I need feedback: what do you think about this
> approach?
> 
> Regards,
> 
> Hervé
> 
> Le vendredi 17 décembre 2021, 11:47:25 CET Guillaume Nodet a écrit :
> > I've tried various things without any good results.
> > Given there's not much history to preserve here, I'd go ahead and just
> > create a new repo with the current contents of the branch.
> > Any objections?
> > 
> > Le dim. 12 déc. 2021 à 15:43, Jeff Jensen
> > <jeffjen...@upstairstechnology.com>
> > 
> > a écrit :
> > > I've split git repos before and using filter-branch is the key to keep
> > > the
> > > desired and purge the rest.
> > > 
> > > From my notes, these two posts helped me:
> > > *
> > > 
> > > https://docs.github.com/en/get-started/using-git/splitting-a-subfolder-o
> > > ut
> > > -into-a-new-repository *
> > > 
> > > https://support.atlassian.com/bitbucket-cloud/docs/split-a-repository-in
> > > -t
> > > wo/
> > > 
> > > These are my shortcut notes for doing so, hope they are clear enough for
> > > you and help. In a new repo, locally convert a current source
> > > subdirectory
> > > to the root directory and purge everything else; then push to remote and
> > > 
> > > locally cleanup:
> > >    1.
> > > 
> > >    Make directory for new repo from current repo:
> > > git clone current-repo to-new-directory
> > > 
> > >    1.
> > >    
> > >    Disconnect from current remote immediately to prevent catastrophe and
> > >    verify none set
> > > 
> > > git remote rm origin
> > > 
> > > git remote -v
> > > 
> > >    1.
> > >    
> > >    Keep desired dir and move it to top level, remove the rest
> > >    1.
> > >    
> > >       FOLDER-NAME: which one to keep and move to top level
> > >       2.
> > >       
> > >       BRANCH-NAME: which branch to do this on (must exist, e.g. master)
> > > 
> > > git filter-branch --prune-empty --subdirectory-filter FOLDER-NAME
> > > BRANCH-NAME
> > > 
> > >    1.
> > >    
> > >    Setup remote repo and verify set
> > > 
> > > git remote add origin https://githost.com/NEW-REPOSITORY-NAME.git
> > > <https://host-stuff.com/NEW-REPOSITORY-NAME.git>
> > > 
> > > git remote -v
> > > 
> > >    1.
> > >    
> > >    Push to new repo
> > > 
> > > git push -u origin BRANCH-NAME
> > > 
> > >    1.
> > >    
> > >    Further cleanup: delete all tags (locally only (Powershell))
> > > 
> > > git tag | foreach-object -process { git tag -d $_ }
> > > 
> > >    1.
> > >    
> > >    Further cleanup: remove local unreachable/recyclable commits
> > >    (remnants
> > >    of prior)
> > > 
> > > git reflog expire --expire-unreachable=now --all
> > > 
> > > git gc --prune=now
> > > 
> > > 
> > > On Sun, Dec 12, 2021 at 7:32 AM Hervé BOUTEMY <herve.bout...@free.fr>
> > > 
> > > wrote:
> > > > nice work done
> > > > I published the result to https://maven.apache.org/ref/caching-LATEST/
> > > > 
> > > > now, on moving source to a separate Git repository, I did a basic test
> > > > pushing
> > > > to a new repository:
> > > > https://github.com/hboutemy/maven-build-cache-extension
> > > > 
> > > > this leads to getting quite a lot of Maven history
> > > > 
> > > > I'm not a Git wizard: is there a way to cut down the history to keep
> > > > only
> > > > the
> > > > interesting part when the build cache code donation was done?
> > > > 
> > > > Regards,
> > > > 
> > > > Hervé
> > > > 
> > > > Le jeudi 9 décembre 2021, 10:39:10 CET Guillaume Nodet a écrit :
> > > > > Le jeu. 9 déc. 2021 à 09:52, Hervé BOUTEMY <herve.bout...@free.fr> a
> > > > 
> > > > écrit :
> > > > > > we have most plugins that are simple with only 1 mono-module build
> > > > > > This makes documentation easy in /plugins/maven-*-plugin/:
> > > > > > see https://maven.apache.org/components/plugins/ for full list
> > > > > > 
> > > > > > we have a few components that have a plugin as part of a larger
> > > > > > multi-module
> > > > > > build, like surefire, jxr, archetype, scm, plugin-tools, enforcer,
> > > > > > release, and
> > > > > > soon wrapper
> > > > > > 
> > > > > > And from experience, it makes documentation harder because there
> > > > > > is
> > > > 
> > > > always
> > > > 
> > > > > > the
> > > > > > question of what to write in the plugin pages and what to write in
> > > > 
> > > > other
> > > > 
> > > > > > modules. Not talking of navigation from /plugins/maven-xxx-plugin
> > > > > > to
> > > > 
> > > > /xxx/
> > > > 
> > > > > > maven-xxx-plugin (we have a trick for redirecting...)
> > > > > > 
> > > > > > In caching case, I see that there is only one submodule, that is
> > > > > > done
> > > > 
> > > > for
> > > > 
> > > > > > ITs
> > > > > > with Surefire: is it necessary? isn't maven-invoker-plugin usable,
> > > 
> > > like
> > > 
> > > > > > for
> > > > > > plugins?
> > > > > 
> > > > > Yes, that's actually a good point.  I thought about that when I read
> > > > 
> > > > Tamás
> > > > 
> > > > > answer.  I'll double check if the integration tests can be merged
> > > > > into
> > > 
> > > a
> > > 
> > > > > single module.
> > > > > 
> > > > > > Regards,
> > > > > > 
> > > > > > Hervé
> > > > > > 
> > > > > > Le jeudi 9 décembre 2021, 09:01:13 CET Guillaume Nodet a écrit :
> > > > > > > I think the repository name should not contain 'extension',
> > > > > > > similar
> > > > 
> > > > to
> > > > 
> > > > > > > surefire which provides a plugin, but it a bit more complex
> > > > > > > The fact that it is provided as an extension is a technicality
> > > > > > > in
> > > > 
> > > > this
> > > > 
> > > > > > case
> > > > > > 
> > > > > > > imho.
> > > > > > > No big deal though...
> > > > > > > 
> > > > > > > Le mar. 7 déc. 2021 à 09:53, Tamás Cservenák
> > > > > > > <ta...@cservenak.net>
> > > 
> > > a
> > > 
> > > > > > écrit :
> > > > > > > > Howdy,
> > > > > > > > 
> > > > > > > > I'd rather group ASF extensions (are there any existing ones
> > > 
> > > aside
> > > 
> > > > of
> > > > 
> > > > > > > > caching?),
> > > > > > > > to be clear... so GH repo could be something like
> > > > > > > > apache/maven-caching-extension
> > > > > > > > apache/maven-foobar-extension
> > > > > > > > etc?
> > > > > > > > 
> > > > > > > > T
> > > > > > > > 
> > > > > > > > On Tue, Dec 7, 2021 at 9:48 AM Guillaume Nodet <
> > > 
> > > gno...@apache.org>
> > > 
> > > > > > wrote:
> > > > > > > > > Following the recent work done to integrate the maven
> > > > > > > > > caching
> > > > > > > > > /
> > > > > > > > 
> > > > > > > > incremental
> > > > > > > > 
> > > > > > > > > build system into maven, I think it's now time to discuss
> > > > > > > > > where
> > > > 
> > > > we
> > > > 
> > > > > > want
> > > > > > 
> > > > > > > > its
> > > > > > > > 
> > > > > > > > > long-term location to be.
> > > > > > > > > 
> > > > > > > > > This extension was donated a few months ago and provides
> > > > > > > > > local
> > > > 
> > > > and
> > > > 
> > > > > > > > > remote
> > > > > > > > > caching of maven project's output, based on computed hashes
> > > > > > > > > of
> > > > 
> > > > the
> > > > 
> > > > > > > > inputs.
> > > > > > > > 
> > > > > > > > > It's defined as a maven extension and can be used as a core
> > > > > > > > > or
> > > > 
> > > > build
> > > > 
> > > > > > > > > extension.  This avoids building the project and speeds up
> > > > 
> > > > builds a
> > > > 
> > > > > > lot
> > > > > > 
> > > > > > > > > !
> > > > > > > > > 
> > > > > > > > > The current status of this work resides in 3 branches:
> > > > > > > > >   * MNG-7129-3.8.x (PR at
> > > > 
> > > > https://github.com/apache/maven/pull/622)
> > > > 
> > > > > > > > >   * MNG-7129-master (PR at
> > > > 
> > > > https://github.com/apache/maven/pull/607)
> > > > 
> > > > > > > > >   *
> > > 
> > > https://github.com/apache/maven/tree/MNG-7129-maven-caching
> > > 
> > > > > > > > > The two first PRs include the required changes to integrate
> > > > > > > > > the
> > > > > > > > > extension
> > > > > > > > > in maven 3.8.x (or rather 3.9.x) and in master. The last
> > > > > > > > > branch
> > > > 
> > > > is
> > > > 
> > > > > > the
> > > > > > 
> > > > > > > > one
> > > > > > > > 
> > > > > > > > > that should be moved to a separate repository and contain
> > > > > > > > > the
> > > > 
> > > > code
> > > > 
> > > > > > for
> > > > > > 
> > > > > > > > the
> > > > > > > > 
> > > > > > > > > extension.  The goal is to agree on the location and the
> > > > > > > > > final
> > > > 
> > > > name
> > > > 
> > > > > > for
> > > > > > 
> > > > > > > > the
> > > > > > > > 
> > > > > > > > > repository (it can't be changed easily).
> > > > > > > > > 
> > > > > > > > > I propose maven-caching as the repository / subproject name,
> > > 
> > > but
> > > 
> > > > any
> > > > 
> > > > > > > > better
> > > > > > > > 
> > > > > > > > > name is welcomed of course.
> > > > > > > > > 
> > > > > > > > > --
> > > > > > > > > ------------------------
> > > > > > > > > Guillaume Nodet
> > > > > > 
> > > > > > ------------------------------------------------------------------
> > > > > > --
> > > > > > -
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> > > > 
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