[WIP PATCH 0/3] implement merge strategy for submodule links

[Heiko Voigt <hvoigt@hvoigt.net>]

The following patch series is a work in progress. The idea is whenever
you need to merge two SHA1's of a submodule we search for a ref in the
submodule which already contains both. If one such ref exists the
resulting SHA1 is the one pointed at by that ref.

The implementation currently searches through all refs and if one (and
only one) ref exists which contains both sides it merges. In all other
cases it fails.

Future Plans:

  * Only search stable branches. E.g. by default only master and
    */master. The stable branch list will be configurable.

  * Use read_gitfile_gently for submodule .git handling

  * Use strbuf in git_path_submodule

Further comments or ideas?

The series can also be found on github:

http://github.com/hvoigt/git/tree/hv/submodule_merge

cheers Heiko

Heiko Voigt (3):
  extend ref iteration for submodules
  add missing && to submodule-merge testcase
  implement automatic fast forward merge for submodules

 cache.h                    |    3 +
 merge-recursive.c          |    9 ++-
 path.c                     |   21 ++++++++
 refs.c                     |   89 +++++++++++++++++++++++---------
 refs.h                     |    2 +
 submodule.c                |  121 ++++++++++++++++++++++++++++++++++++++++++++
 submodule.h                |    2 +
 t/t7405-submodule-merge.sh |  117 ++++++++++++++++++++++++++++++++++++++++---
 8 files changed, 328 insertions(+), 36 deletions(-)