[PATCH v8 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:

 - Is the locations of the newly introduced definitions/macros
 appropriate?

Changes since V7:

 - In commit 2/4, mark the 'struct repository' parameter of
 ce_mode_from_stat() UNUSED. In commit 3/4, drop it.

 - Don't check '!repo' in the getters, which lets the developers know
 there is a bug to fix when NULL is passed in. Callers should be
 responsible of passing non-null repos. Therefore, adjust the call in
 write_entry().

 Change back to check 'repo->initiaized' instead of 'repo->gitdir'.

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: pass 'repo' to 'ce_mode_from_stat()'
  environment: move trust_executable_bit into repo_config_values
  environment: move has_symlinks into repo_config_values

 apply.c                |  6 +++---
 builtin/update-index.c |  2 +-
 combine-diff.c         |  2 +-
 compat/mingw.c         | 17 +++++++++++++----
 compat/mingw.h         |  3 +++
 diff-lib.c             | 10 +++++-----
 entry.c                |  3 ++-
 environment.c          | 23 +++++++++++++++++++----
 environment.h          |  8 ++++++--
 git-compat-util.h      |  4 ++++
 read-cache.c           | 15 +++++++--------
 read-cache.h           | 16 ++++++++++++----
 12 files changed, 76 insertions(+), 33 deletions(-)