[PATCH v2 0/3] environment: migrate 'trust_executable_bit' into 'repo_config_values'

[Tian Yuchen <cat@malon.dev>]

The 'core.filemode' (stored as 'trust_executable_bit') configuration
act as a core filesystem capability flag.

This series moves it into 'struct repo_config_values' to tie it to
the specific repository instance it was read from. Eager parsing
is maintained because this flag is 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])

Changes since V1:

Dropped istate plumbing: Dropped the last commit ("read-cache: pass
'istate' to stat/mode helper functions") to keep the patch focused.

Introduced safe getter: Getter function 'repo_trust_executable_bit()'
has been introduced to retrieve configuration values safely.

Added comments for 'ce_mode_from_stat()'.

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/

Mentored-by: Christian Couder <christian.couder@gmail.com>
Mentored-by: Ayush Chandekar <ayu.chandekar@gmail.com>
Mentored-by: Olamide Caleb Bello <belkid98@gmail.com>
Signed-off-by: Tian Yuchen <cat@malon.dev>

Tian Yuchen (3):
  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

 apply.c       |  2 +-
 environment.c | 11 +++++++++--
 environment.h |  9 ++++++++-
 read-cache.c  | 28 +++++++++++++++++++++++-----
 read-cache.h  | 16 ++--------------
 5 files changed, 43 insertions(+), 23 deletions(-)

-- 
2.43.0