Merge branch 'ps/setup-drop-global-state'

The refactoring of 'setup.c' has been continued to drop remaining
global state (`git_work_tree_cfg`, `is_bare_repository_cfg`), updating
`is_bare_repository()` to no longer implicitly rely on
`the_repository`.

* ps/setup-drop-global-state:
  treewide: drop USE_THE_REPOSITORY_VARIABLE
  environment: stop using `the_repository` in `is_bare_repository()`
  environment: split up concerns of `is_bare_repository_cfg`
  builtin/init: stop modifying `is_bare_repository_cfg`
  setup: remove global `git_work_tree_cfg` variable
  builtin/init: simplify logic to configure worktree
  builtin/init: stop modifying global `git_work_tree_cfg` variable

diff --cc attr.c
Simple merge

diff --cc builtin/gc.c
Simple merge

diff --cc builtin/repo.c
Simple merge

diff --cc environment.c
index ba2c60103ff51c5e50a6c0e08635c9a3453eead6,bf209534153b2b7ba57aa0034ca8f2721e0b5d87..bee2cd621ac9b505b829792f6b818cf2fd85dfbb
--- 1/environment.c
--- 2/environment.c
+++ b/environment.c
@@@ -46,7 -48,7 +46,6 @@@ int has_symlinks = 1
  int minimum_abbrev = 4, default_abbrev = -1;
  int ignore_case;
  int assume_unchanged;
- int is_bare_repository_cfg = -1; /* unspecified */
 -int warn_on_object_refname_ambiguity = 1;
  char *git_commit_encoding;
  char *git_log_output_encoding;
  char *apply_default_whitespace;

diff --cc environment.h
index 6f182869558395caeaf6f0595c331564ccf0d8c7,164a55df2ca225c50b1759d33d822a8cc20fe96f..f5b9b33c901d0adda3a0cc650a76de13290cbcd3
--- 1/environment.h
--- 2/environment.h
+++ b/environment.h
@@@ -157,12 -149,10 +159,8 @@@ int is_bare_repository(struct repositor
   */
  int have_git_dir(void);
  
- extern int is_bare_repository_cfg;
- int is_bare_repository(void);
- extern char *git_work_tree_cfg;
- 
  /* Environment bits from configuration mechanism */
  extern int trust_executable_bit;
 -extern int trust_ctime;
 -extern int check_stat;
  extern int has_symlinks;
  extern int minimum_abbrev, default_abbrev;
  extern int ignore_case;

diff --cc mailmap.c
Simple merge