Re: [PATCH 2/2] RF+ENH(TST): compare the entire list of submodule status --recursive to stay intact

[Yaroslav O Halchenko <debian@onerussian.com>]

On Thu, 13 Dec 2018, Stefan Beller wrote:

> > cool, thanks for the feedback - I will then try to make it happen

> > quick one (so when I get to it I know):  should I replicate all those
> > tests you have for other update strategies? (treating of config
> > specifications etc)

> If there is a sensible way to do so?
> I have the impression that there are enough differences, that it
> may not be possible to replicate all tests meaningfully from the
> other modes.

oh, by replicate I just meant to copy/paste and adjust for expected for
--reset-hard test behavior (and possibly introduced helper),
nothing fancy, just duplication as for replication ;-) 

> > There is no easy way to parametrize them somehow?

> There is t/lib-submodule-update.sh, which brings this to
> an extreme, as it makes a "test suite in a test suite"; and I would
> not follow that example for this change.

ok

> > ;)    In Python world I might have mocked the actual underlying call to
> > update, to see what option it would be getting and assure that it is the
> > one I specified via config, and then sweepped through all of them
> > to make sure nothing interim changes it.  Just wondering if may be
> > something like that exists in git's tests support.

> gits tests are very heavy on end to end testing, i.e. run a whole command
> and observe its output. This makes our command setup code, (i.e. finding
> the repository, parsing options, reading possible config, etc) a really well
> exercised code path. ;-)

> There is a recent push towards testing only units, most of
> t/helper is used for that, e.g. c.f. 4c7bb45269 (test-reach:
> test get_reachable_subset, 2018-11-02).

> So if you have a good idea how to focus the submodule
> tests more on the (new) unit that you add, that would be cool.

no, not really any good ideas -- I am new here, but I will keep an eye open.

> > BTW - sorry if RTFM and unrelated, is there  a way to

> >     update --merge

> > but allowing only  fast-forwards?  My use case is collection of this
> > submodules: http://datasets.datalad.org/?dir=/openneuro  which all
> > should come from github and I should not have any changes of my own.

> So you want the merge option  --ff-only
> to be passed to the submodule merge command. I guess you could make
> a patch, that update takes another option (--ff-only, only useful when
> --merge is given), which is then propagated.

> I am not sure if we could have a more generalized option passing,
> which would allow to pass any option (for its respective command)
> to the command that is run in the update mode.

wouldn't it be (theoretically) possible, in principle, to pass
them via some config variable?  e.g. instead of  

submodule update --reset-hard

have

-c submodule.update.reset.opts=--hard update --reset

and then analogously

-c submodule.update.merge.opts=--ff-only update --merge

(--ff-only I guess would make no sense for any "supermodule" - a repo
with submodules)

> > Sure thing if all is clean etc, merge should result in fast-forward.  I
> > just do not want to miss a case where there was some (temporary?) "dirt"
> > which I forgot to reset and it would then get merged etc.

> maybe use --rebase, such that your potential change would bubble
> up and possibly produce a merge conflict?

that is a good idea as a workaround, thanks!

-- 
Yaroslav O. Halchenko
Center for Open Neuroscience     http://centerforopenneuroscience.org
Dartmouth College, 419 Moore Hall, Hinman Box 6207, Hanover, NH 03755
Phone: +1 (603) 646-9834                       Fax: +1 (603) 646-1419
WWW:   http://www.linkedin.com/in/yarik