[PATCH 0/2] rebase.useBuiltin doc & test mode

On Wed, Nov 14 2018, Stefan Beller wrote:

quoted

But maybe I'm being overly paranoid. What do those more familiar with
this think?

I am not too worried,
* as rebase is a main porcelain, that is even hard to use in a script.
  so any failures are not deep down in some automation,
  but when found exposed quickly (and hopefully reported).
* 5541bd5b8f was merged to next a month ago; internally we
   distribute the next branch to Googlers (on a weekly basis)
   and we have not had any bug reports regarding rebase.
   (Maybe our environment is too strict for the wide range
    of bugs reported)

I do the same at Booking.com (although at a more ad-hoc schedule) and
got the report whose fix is now sitting in "pu" noted upthread.

I fear that these sorts of corporate environments, both Google's and
Booking's, end up testing a relatively narrow featureset. Most people
have similar enough workflows, e.g. just using "git pull --rebase",
I'd be surprised if we have more than 2-3 internal users who ever use
the --onto option for example.

* Johannes reported that the rebase is used in GfW
   https://public-inbox.org/git/nycvar.QRO.7.76.6.1808241320540.73@tvgsbejvaqbjf.bet/
   https://github.com/git-for-windows/git/pull/1800
   and from my cursory reading it is part of
   2.19.windows, which has a large user base.

quoted

(and would re-enable rebase.useBuiltin=true in
master right after 2.20 is out the door).

That would be fine with me as well, but I'd rather
document rebase.useBuiltin instead of flip-flopping
the switch around the release.

Have there been any fixes that are only in
the C version (has the shell version already bitrotted)?

That's a good question, one which I don't think we knew the answer to
before the following patches. As it turns out no, we still run the
tests without failures with GIT_TEST_REBASE_USE_BUILTIN=false.

Ævar Arnfjörð Bjarmason (2):
  rebase doc: document rebase.useBuiltin
  tests: add a special setup where rebase.useBuiltin is off

 Documentation/config/rebase.txt | 14 ++++++++++++++
 builtin/rebase.c                |  5 ++++-
 t/README                        |  3 +++
 3 files changed, 21 insertions(+), 1 deletion(-)

-- 
2.19.1.1182.g4ecb1133ce