Il 21/03/2018 22:50, Johannes Schindelin ha scritto:
Hi Michele,
On Mon, 19 Mar 2018, Michele Locati wrote:
[...]
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2.16.2.windows.1
Yaaaaay!
Out of curiosity: did the CONTRIBUTING.md file help that was recently
turned into a guide how to contribute to Git (for Windows) by Derrick
Stolee?
Well, no. Here's what led me here...
The people behind the concrete5 CMS asked support for improving the
following procedure:
concrete5 is stored in
https://github.com/concrete5/concrete5
In order to make it installable with Composer (a PHP package manager),
we need to extract its "/concrete" directory, and push the results to
https://github.com/concrete5/concrete5-core
We previously used "git filter-branch --all" with this script:
https://github.com/concrete5/core_splitter/blob/70879e676b95160f7fc5d0ffc22b8f7420b0580b/bin/splitcore
That script is executed every time someone pushes concrete5/concrete5,
and it took very long time (3~5 minutes).
I noticed on the git-filter-branch manual page that there's a
"--state-branch", and it seemed quite interesting.
So, I asked in git@vger.kernel.org how to use it, and the author of that
feature (Ian Campbell) told me to look at some code he wrote.
So, I wrote
https://github.com/concrete5/incremental-filter-branch
which wraps "git filter-branch --filter-state", and it's used in
https://github.com/concrete5/core_splitter/blob/99bbbcea1ab90572a04864ccb92327532ab6a42c/bin/splitcore
(it not yet in production: Korvin wants to be sure everything works well
before adopting it)
The time required for the operation dropped from 3~5 minutes to ~10
seconds ;)
While writing that script, I noticed a couple of things that could be
improved in "git-filter-branch", so I submitted
https://marc.info/?l=git&m=152111905428554&w=2
(so that the script could run without problems if there's nothing to do)
and
https://marc.info/?l=git&m=152147095416175&w=2
(so that --filter-state could be used on Mac and other non-Linux systems).
How did I learn how to submit to git? I searched for "git src", landed
on https://github.com/git/git, read Documentation/SubmittingPatches and
used git send-email.
And yes, all that on Windows (and WSL).
Ciao,
Johannes
Ciao!
--
Michele
