Stefan Beller <sbeller@xxxxxxxxxx> writes:
> Some submodules in the referenced superproject may not be there,
> (they are just not initialized/cloned/checked out), which yields
> an error for now.
Perhaps you can teach "git clone --reference" an new option
(--reference-if-able) to do this? Then
When `--reference` is given together with `--recursive`,
the reference repository is assumed to contain the submodules
as well and the submodules are setup as alternates of the
submodules in the given reference project.
in which "assumed" is a horrible wording (leave the reader
wondering: "so what happens to my data when the assumption does not
hold") can become a lot more reasonable
When using --reference with --recursive, the --reference is used
to specify a repository that has a copy of the superproject. If
that copy has submodules cloned for itself in its $GIT_DIR/modules,
they are used as --reference when cloning submodules in the
resulting clone.
and readers expectation would match with the reality. Their
submodules would be cloned in a regular fashion if the central
mirror does not have it, and would take advantage of it if there is
already a clone.
Come to think of it, do we even need --super-reference? "git clone
--reference --recursive" is a two step process, in that first the
superproject is cloned while creating objects/info/alternates, and
then submodules are cloned (via "update --init"). Can we make the
procedure to clone a submodule always look at the reference of the
superproject (i.e. objects/info/alternates) and try to borrow from
the place in it that corresponds to the submodule? That way, not
just "git clone --reference --recursive" would take advantage of the
existing mirrors of submodules, a user who does this:
$ git clone --reference $URL super
$ cd super
$ git submodule update --init ...
would be able to take advantage of the "what the mirror the
superproject uses already has" when cloning the submodules, no?
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