[PATCHv5 0/4] git-rm absorbs submodule git directory before deletion

v5:
* removed the patch for adding {run,start,finish}_or_die
* added one more flag to the function ok_to_remove_submodule
  (if die on error is ok)
* renamed ok_to_remove_submodule to bad_to_remove_submodule to signal
  the error case better.

v4:
* reworded commit messages of the last 2 patches
* introduced a new patch introducing {run,start,finish}_command_or_die
* found an existing function in dir.h to use to remove a directory
  which deals gracefully with the cornercases, that Junio pointed out.
  
v3:
* removed the patch to enhance ok_to_remove_submodule to absorb the submodule
  if needed
* Removed all the error reporting from git-rm that was related to submodule
  git directories not absorbed.
* instead just absorb the git repositories or let the absorb function die
  with an appropriate error message.

v2:
* new base where to apply the patch:
  sb/submodule-embed-gitdir merged with sb/t3600-cleanup.
  I got merge conflicts and resolved them this way:
#@@@ -709,9 -687,10 +687,9 @@@ test_expect_success 'checking out a com
#          git commit -m "submodule removal" submod &&
#          git checkout HEAD^ &&
#          git submodule update &&
#-         git checkout -q HEAD^ 2>actual &&
#+         git checkout -q HEAD^ &&
#          git checkout -q master 2>actual &&
# -        echo "warning: unable to rmdir submod: Directory not empty" >expected &&
# -        test_i18ncmp expected actual &&
# +        test_i18ngrep "^warning: unable to rmdir submod:" actual &&
#          git status -s submod >actual &&
#          echo "?? submod/" >expected &&
#          test_cmp expected actual &&
#

* improved commit message in "ok_to_remove_submodule: absorb the submodule git dir"
  (David Turner offered me some advice on how to write better English off list)
* simplified code in last patch:
  -> dropped wrong comment for fallthrough
  -> moved redundant code out of both bodies of an if-clause.
* Fixed last patchs commit message to have "or_die" instead of or_dir.

v1: The "checkout --recurse-submodules" series got too large to comfortably send it out for review, so I had to break it up into smaller series'; this is the first subseries, but it makes sense on its own.

This series teaches git-rm to absorb the git directory of a submodule instead of failing and complaining about the git directory preventing deletion.

It applies on origin/sb/submodule-embed-gitdir.

Any feedback welcome!

Thanks, Stefan

Stefan Beller (4):
  submodule.h: add extern keyword to functions
  submodule: modernize ok_to_remove_submodule to use argv_array
  submodule: rename and add flags to ok_to_remove_submodule
  rm: absorb a submodules git dir before deletion

 builtin/rm.c  | 83 +++++++++++++++--------------------------------------------
 submodule.c   | 57 ++++++++++++++++++++++++++--------------
 submodule.h   | 59 ++++++++++++++++++++++++------------------
 t/t3600-rm.sh | 39 +++++++++++-----------------
 4 files changed, 108 insertions(+), 130 deletions(-)