[PATCHv6 0/7] submodule embedgitdirs

v6:
 * renamed embedgitdirs to absorbgitdirs embedding may be interpreted as
   embedding the git dir into the working directory, whereas absorbing sounds
   more like the submodule is absorbed by the superproject, making the
   submodule less independent
 * Worktrees API offer uses_worktrees(void) and submodule_uses_worktree(path).
 * moved the printing to stderr and one layer up (out of the pure
   relocate_git_dir function).
 * connect_... is in dir.h now.

v5:
* Add another layer of abstraction, i.e. the relocate_git_dir is only about
  moving a git dir of one repository. The submodule specific stuff (e.g.
  recursion into nested submodules) is in submodule.{c,h}

  This was motivated by reviews on the series of checkout aware of submodules
  building on top of this series, as we want to directly call the embed-git-dirs
  function without the overhead of spawning a child process.

v4:
* rebuilt on top of nd/worktree-list-fixup
* fix and test behavior for un-init submodules (don't crash, rather do nothing)
* incorporated a "static" as pointed out by Ramsay
* use internal functions instead of duplicating code in worktree.c
  (use get_common_dir_noenv for the submodule to actually get the common dir)
* fixed a memory leak in relocate_gitdir

v3:
* have a slightly more generic function "relocate_gitdir".
  The recursion is strictly related to submodules, though.
* bail out if a submodule is using worktrees.
  This also lays the groundwork for later doing the proper thing,
  as worktree.h offers a function `get_submodule_worktrees(path)`
* nit by duy: use git_path instead of git_common_dir

v2:
* fixed commit message for patch:
 "submodule: use absolute path for computing relative path connecting"
* a new patch "submodule helper: support super prefix"
* redid the final patch with more tests and fixing bugs along the way
* "test-lib-functions.sh: teach test_commit -C <dir>" unchanged

v1: The discussion of the submodule checkout series revealed to me that a command is needed to move the git directory from the submodules working tree to be embedded into the superprojects git directory.

So I wrote the code to intern the submodules git dir into the superproject, but whilst writing the code I realized this could be valueable for our use in testing too. So I exposed it via the submodule--helper. But as the submodule helper ought to be just an internal API, we could also offer it via the proper submodule command.

The command as it is has little value to the end user for now, but breaking it out of the submodule checkout series hopefully makes review easier.

Thanks, Stefan

Stefan Beller (7):
  submodule: use absolute path for computing relative path connecting
  submodule helper: support super prefix
  test-lib-functions.sh: teach test_commit -C <dir>
  worktree: get worktrees from submodules
  worktree: add function to check if worktrees are in use
  move connect_work_tree_and_git_dir to dir.h
  submodule: add absorb-git-dir function

 Documentation/git-submodule.txt    |  15 +++++
 builtin/submodule--helper.c        |  69 ++++++++++++++++----
 dir.c                              |  38 +++++++++++
 dir.h                              |   4 ++
 git-submodule.sh                   |   7 +-
 git.c                              |   2 +-
 submodule.c                        | 127 ++++++++++++++++++++++++++++++-------
 submodule.h                        |   5 +-
 t/t7412-submodule-absorbgitdirs.sh | 101 +++++++++++++++++++++++++++++
 t/test-lib-functions.sh            |  20 ++++--
 worktree.c                         |  70 +++++++++++++++++---
 worktree.h                         |  13 ++++
 12 files changed, 418 insertions(+), 53 deletions(-)
 create mode 100755 t/t7412-submodule-absorbgitdirs.sh