[GSOC PATCH 0/2] mailmap: reduce global state

Hi,

I am an applicant for GSoC 2026, aiming for the "Refactoring in order to reduce Git's global state" project. I have already submitted my microproject, so please treat this series simply as an extra familiarization exercise to better understand the codebase and the goals of the project.

The project description mainly focuses on 'environment.c' but I noticed that an Outreachy intern is currently working in that area. To avoid stepping on anyone's toes or duplicating work, I decided to look for other subsystems and chose 'mailmap.c', which currently relies on 'the_repository' and global configuration variables.

This patch series aims to reduce the global variable dependency of the mailmap subsystem:

  - Patch 1 eliminates the implicit 'the_repository' dependency in the
    'read_mailmap' and 'read_mailmap_blob' functions by adding a
    'struct repository' parameter.

  - Patch 2 removes the 'git_mailmap_file' and 'git_mailmap_blob' global
    variables, shifting to on-demand configuration reading via the config
    set helpers and using local variables.

Thanks.

Burak Kaan Karaçay (2):
  mailmap: stop using the_repository
  mailmap: drop global config variables

 builtin/blame.c         |  2 +-
 builtin/cat-file.c      |  2 +-
 builtin/check-mailmap.c |  4 ++--
 builtin/commit.c        |  2 +-
 builtin/log.c           |  2 +-
 builtin/shortlog.c      |  2 +-
 environment.c           | 19 -------------------
 mailmap.c               | 30 +++++++++++++++++++-----------
 mailmap.h               |  8 +++-----
 pretty.c                |  2 +-
 ref-filter.c            |  2 +-
 11 files changed, 31 insertions(+), 44 deletions(-)