[PATCHv3 0/5] submodule helper: cleanup prefix passing

Thanks Junio for the in-depth discussion! I squashed the first two commits as they are actually fixing the same underlying issue. Setting wt_prefix=<empty> is the actual preparation for switching the submodule--helper to git -C instead of "--prefix$prefix". But setting wt_prefix=empty would break existing tests, so the different computation of the prefix (relative_path of sm_path instead of plain sm_path) is the fix of the fix.

Eric, I picked up the git -C in the tests, which are broken into 2 patches and have a more concise commit message each.

Jacob, thanks for your 
  Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
although I changed the code so much, that I did not put it in this series.

New in this series is the last commit, which gets rid of the prefix for "submodule--helper clone". (It was useless to begin with; probably just cargo-culted in because we had it in "submodule--helper list")

Thanks, Stefan

Stefan Beller (5):
  submodule: prepare recursive path from non root directory
  submodule--helper list: lose the extra prefix option
  submodule update: add test for recursive from non root dir
  submodule sync: test syncing one submodule
  submodule--helper clone: lose the extra prefix option

 builtin/submodule--helper.c | 10 ++--------
 git-submodule.sh            | 23 +++++++++++++----------
 t/t7403-submodule-sync.sh   | 13 +++++++++----
 t/t7406-submodule-update.sh | 14 +++++++++++---
 4 files changed, 35 insertions(+), 25 deletions(-)