[PATCH v5 0/4] environment: migrate 'trust_executable_bit' and 'has_symlinks' into 'repo_config_values'

This series moves 'trust_executable_bit' and 'has_symlinks' into 'struct repo_config_values' to tie them to the specific repository instance they were read from. Eager parsing is maintained because these two flags are heavily consulted in hot paths.

Note: 'repo_config_values()' still does not support any struct
repository other than the_repository due to how deeply these flags
are accessed. In other words, this series of patches is laying
the groundwork for the eventual elimination of the_repository.

Previous related work:

[PATCH 2/6] config: add trust_executable_bit to global config [1] [PATCH] Refactor 'trust_executable_bit' to repository-scoped setting [2] (This previous attempt was unsuccessful because the target location selected was 'struct repo_settings', which our analysis indicated was not the optimal choice. For further details, please see: [3])

[PATCH 5/6] config: move has_symlinks [4]

RFC:

 - I wonder if there is a better way to deal with compat/mingw.c in
 commit 4/4. Is it possible not to introduce a fallback variable?

Change since V4:

 - the migration of has_symlinks is back [5], as a commit 4/4;

 - drop the comment for repo_executable_bit();

 - do not always pass the_repository to the getters. Use 'repo' when possible. 

Thanks!

[1] https://lore.kernel.org/git/837b5360b40f992351f489a0ae05fedf49884c6e.1685716420.git.gitgitgadget@gmail.com/ [2] https://lore.kernel.org/git/20260301190017.53539-1-dronarajgyawali@gmail.com/ [3] https://lore.kernel.org/git/xmqq1pht6nyx.fsf@gitster.g/ [4] https://lore.kernel.org/git/a154008619790f7a60f2bba91db7b0fe29e67e1a.1685716420.git.gitgitgadget@gmail.com/ [5] https://lore.kernel.org/git/xmqq7bokebct.fsf@gitster.g/

Tian Yuchen (4):
  read-cache: remove redundant extern declarations
  read-cache: move 'ce_mode_from_stat()' to 'read-cache.c'
  environment: move trust_executable_bit into repo_config_values
  environment: move has_symlinks into repo_config_values

 apply.c        |  4 ++--
 combine-diff.c |  2 +-
 compat/mingw.c |  7 ++++---
 entry.c        |  2 +-
 environment.c  | 28 ++++++++++++++++++++++++----
 environment.h  |  9 +++++++--
 read-cache.c   | 33 ++++++++++++++++++++++++++-------
 read-cache.h   | 16 ++--------------
 8 files changed, 67 insertions(+), 34 deletions(-)