[PATCH v2 0/1] stash apply: be prepared to run in a worktree's subdirectory

I saw this issue a couple times in my setup, and always wondered why nobody else seemed to be hit by this. When I finally found/made some time to investigate, I found out that it really requires a specific setup: I have many worktrees connected to my main git.git clone, often run inside t/ and I do stash quite often (now that git stash's performance is a joy on Windows).

Changes since v1:

 * We now make sure to also set GIT_DIR.

Johannes Schindelin (1):
  stash apply: report status correctly even in a worktree's subdirectory

 builtin/stash.c              |  4 ++++
 t/t3908-stash-in-worktree.sh | 27 +++++++++++++++++++++++++++
 2 files changed, 31 insertions(+)
 create mode 100755 t/t3908-stash-in-worktree.sh

base-commit: 4c86140027f4a0d2caaa3ab4bd8bfc5ce3c11c8a
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-354%2Fdscho%2Fapply-stash-in-subdirectory-v2
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-354/dscho/apply-stash-in-subdirectory-v2
Pull-Request: https://github.com/gitgitgadget/git/pull/354

Range-diff vs v1:

 1:  a687c16b82 ! 1:  4e19436fbf stash apply: report status correctly even in a worktree's subdirectory
     @@ -3,15 +3,20 @@
          stash apply: report status correctly even in a worktree's subdirectory
      
          When Git wants to spawn a child Git process inside a worktree's
     -    subdirectory, we need to take care of specifying the work tree's
     -    top-level directory explicitly because it cannot be discovered: the
     -    current directory is _not_ the top-level directory of the work tree, and
     -    neither is it inside the parent directory of `GIT_DIR`.
     +    subdirectory while `GIT_DIR` is set, we need to take care of specifying
     +    the work tree's top-level directory explicitly because it cannot be
     +    discovered: the current directory is _not_ the top-level directory of
     +    the work tree, and neither is it inside the parent directory of
     +    `GIT_DIR`.
      
          This fixes the problem where `git stash apply` would report pretty much
          everything deleted or untracked when run inside a worktree's
          subdirectory.
      
     +    To make sure that we do not introduce the "reverse problem", i.e. when
     +    `GIT_WORK_TREE` is defined but `GIT_DIR` is not, we simply make sure
     +    that both are set.
     +
          Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
      
       diff --git a/builtin/stash.c b/builtin/stash.c
     @@ -23,6 +28,8 @@
       		cp.dir = prefix;
      +		argv_array_pushf(&cp.env_array, GIT_WORK_TREE_ENVIRONMENT"=%s",
      +				 absolute_path(get_git_work_tree()));
     ++		argv_array_pushf(&cp.env_array, GIT_DIR_ENVIRONMENT"=%s",
     ++				 absolute_path(get_git_dir()));
       		argv_array_push(&cp.args, "status");
       		run_command(&cp);
       	}