[PATCH 0/2] clone: record submodule alternates when not recursing

[Stefan Beller <sbeller@google.com>]

The meat is in the second patch:
    The commit 31224cbdc7 (clone: recursive and reference option triggers
    submodule alternates, 2016-08-17) argued for any further `submodule update`
    to respect the initial setup. This is not the case if you only pass
    '--reference[-if-able]' to the initial clone without instructing to
    recurse into submodules.
    
    If there are submodules however the user is likely to later run
    a 'submodule update --init' to obtain the submodules. In this case we
    also want to have the references available.

The first patch produces a nice helper function and some refactoring.

Thanks,
Stefan

Stefan Beller (2):
  submodule.c: add has_submodules to check if we have any submodules
  clone: remember references for submodules even when not recursing

 builtin/checkout.c          |  2 +-
 builtin/clone.c             |  8 +++--
 builtin/fetch.c             |  2 +-
 builtin/read-tree.c         |  2 +-
 builtin/submodule--helper.c |  6 ++--
 submodule.c                 | 78 +++++++++++++++++++++++++++++++++++----------
 submodule.h                 |  8 ++++-
 unpack-trees.c              |  2 +-
 8 files changed, 82 insertions(+), 26 deletions(-)

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2.12.2.575.gb14f27f917