[PATCH v3 2/8] environment: move "check_stat" into `struct repo_config_values`

[Olamide Caleb Bello <belkid98@gmail.com>]

The `core.checkstat` configuration is currently stored in the global
variable `check_stat`, which makes it shared across repository
instances within a single process.

Store it instead in `repo_config_values`, where eagerly‑parsed
repository configuration lives. `core.checkstat` is parsed eagerly
because it controls how `match_stat_data()` and related functions
decide file freshness; a lazy parse could lead to unexpected
behavior or complicate libification. This preserves the existing
eager‑parsing behavior while tying the value to the repository it
was read from, avoiding cross‑repository state leakage, and
continuing the effort to reduce reliance on global configuration
state.

Update all references to use `repo_config_values()`.

Mentored-by: Christian Couder <christian.couder@gmail.com>
Mentored-by: Usman Akinyemi <usmanakinyemi202@gmail.com>
Signed-off-by: Olamide Caleb Bello <belkid98@gmail.com>
---
 entry.c       |  3 ++-
 environment.c |  6 +++---
 environment.h |  2 +-
 statinfo.c    | 10 +++++-----
 4 files changed, 11 insertions(+), 10 deletions(-)

diff --git a/entry.c b/entry.c
index 7817aee362..c55e867d8a 100644
--- a/entry.c
+++ b/entry.c
@@ -443,7 +443,8 @@ static int check_path(const char *path, int len, struct stat *st, int skiplen)
 static void mark_colliding_entries(const struct checkout *state,
 				   struct cache_entry *ce, struct stat *st)
 {
-	int trust_ino = check_stat;
+	struct repo_config_values *cfg = repo_config_values(the_repository);
+	int trust_ino = cfg->check_stat;
 
 #if defined(GIT_WINDOWS_NATIVE) || defined(__CYGWIN__)
 	trust_ino = 0;
diff --git a/environment.c b/environment.c
index 0a9067729e..8542ac3141 100644
--- a/environment.c
+++ b/environment.c
@@ -42,7 +42,6 @@ static int pack_compression_seen;
 static int zlib_compression_seen;
 
 int trust_executable_bit = 1;
-int check_stat = 1;
 int has_symlinks = 1;
 int minimum_abbrev = 4, default_abbrev = -1;
 int ignore_case;
@@ -315,9 +314,9 @@ int git_default_core_config(const char *var, const char *value,
 		if (!value)
 			return config_error_nonbool(var);
 		if (!strcasecmp(value, "default"))
-			check_stat = 1;
+			cfg->check_stat = 1;
 		else if (!strcasecmp(value, "minimal"))
-			check_stat = 0;
+			cfg->check_stat = 0;
 		else
 			return error(_("invalid value for '%s': '%s'"),
 				     var, value);
@@ -721,4 +720,5 @@ void repo_config_values_init(struct repo_config_values *cfg)
 	cfg->apply_sparse_checkout = 0;
 	cfg->branch_track = BRANCH_TRACK_REMOTE;
 	cfg->trust_ctime = 1;
+	cfg->check_stat = 1;
 }
diff --git a/environment.h b/environment.h
index 64d537686e..1d3e2e4f23 100644
--- a/environment.h
+++ b/environment.h
@@ -92,6 +92,7 @@ struct repo_config_values {
 	char *attributes_file;
 	int apply_sparse_checkout;
 	int trust_ctime;
+	int check_stat;
 
 	/* section "branch" config values */
 	enum branch_track branch_track;
@@ -162,7 +163,6 @@ extern char *git_work_tree_cfg;
 
 /* Environment bits from configuration mechanism */
 extern int trust_executable_bit;
-extern int check_stat;
 extern int has_symlinks;
 extern int minimum_abbrev, default_abbrev;
 extern int ignore_case;
diff --git a/statinfo.c b/statinfo.c
index 4fc12053f4..5e00af127d 100644
--- a/statinfo.c
+++ b/statinfo.c
@@ -68,19 +68,19 @@ int match_stat_data(const struct stat_data *sd, struct stat *st)
 
 	if (sd->sd_mtime.sec != (unsigned int)st->st_mtime)
 		changed |= MTIME_CHANGED;
-	if (cfg->trust_ctime && check_stat &&
+	if (cfg->trust_ctime && cfg->check_stat &&
 	    sd->sd_ctime.sec != (unsigned int)st->st_ctime)
 		changed |= CTIME_CHANGED;
 
 #ifdef USE_NSEC
-	if (check_stat && sd->sd_mtime.nsec != ST_MTIME_NSEC(*st))
+	if (cfg->check_stat && sd->sd_mtime.nsec != ST_MTIME_NSEC(*st))
 		changed |= MTIME_CHANGED;
-	if (cfg->trust_ctime && check_stat &&
+	if (cfg->trust_ctime && cfg->check_stat &&
 	    sd->sd_ctime.nsec != ST_CTIME_NSEC(*st))
 		changed |= CTIME_CHANGED;
 #endif
 
-	if (check_stat) {
+	if (cfg->check_stat) {
 		if (sd->sd_uid != (unsigned int) st->st_uid ||
 			sd->sd_gid != (unsigned int) st->st_gid)
 			changed |= OWNER_CHANGED;
@@ -94,7 +94,7 @@ int match_stat_data(const struct stat_data *sd, struct stat *st)
 	 * clients will have different views of what "device"
 	 * the filesystem is on
 	 */
-	if (check_stat && sd->sd_dev != (unsigned int) st->st_dev)
+	if (cfg->check_stat && sd->sd_dev != (unsigned int) st->st_dev)
 			changed |= INODE_CHANGED;
 #endif
 
-- 
2.53.0.155.g9f36b15afa