environment: stop storing "core.preferSymlinkRefs" globally

Same as the preceding commit, storing the "core.preferSymlinkRefs" value
globally is misdesigned as this setting may be set per repository.

There is only a single user of this value anyway, namely the "files"
backend. So let's just remove the global variable and read the value of
this setting when initializing the backend.

Signed-off-by: Patrick Steinhardt <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: pks-t

config.c

@@ -1447,11 +1447,6 @@ static int git_default_core_config(const char *var, const char *value,
 		return 0;
 	}
 
-	if (!strcmp(var, "core.prefersymlinkrefs")) {
-		prefer_symlink_refs = git_config_bool(var, value);
-		return 0;
-	}
-
 	if (!strcmp(var, "core.warnambiguousrefs")) {
 		warn_ambiguous_refs = git_config_bool(var, value);
 		return 0;

environment.c

@@ -34,7 +34,6 @@ int has_symlinks = 1;
 int minimum_abbrev = 4, default_abbrev = -1;
 int ignore_case;
 int assume_unchanged;
-int prefer_symlink_refs;
 int is_bare_repository_cfg = -1; /* unspecified */
 int warn_ambiguous_refs = 1;
 int warn_on_object_refname_ambiguity = 1;

environment.h

@@ -156,7 +156,6 @@ extern int has_symlinks;
 extern int minimum_abbrev, default_abbrev;
 extern int ignore_case;
 extern int assume_unchanged;
-extern int prefer_symlink_refs;
 extern int warn_ambiguous_refs;
 extern int warn_on_object_refname_ambiguity;
 extern char *apply_default_whitespace;

refs/files-backend.c

@@ -1,6 +1,7 @@
 #define USE_THE_REPOSITORY_VARIABLE
 
 #include "../git-compat-util.h"
+#include "../config.h"
 #include "../copy.h"
 #include "../environment.h"
 #include "../gettext.h"
@@ -76,6 +77,7 @@ struct files_ref_store {
 
 	char *gitcommondir;
 	enum log_refs_config log_all_ref_updates;
+	int prefer_symlink_refs;
 
 	struct ref_cache *loose;
 
@@ -109,6 +111,7 @@ static struct ref_store *files_ref_store_init(struct repository *repo,
 	refs->packed_ref_store =
 		packed_ref_store_init(repo, refs->gitcommondir, flags);
 	refs->log_all_ref_updates = repo_settings_get_log_all_ref_updates(repo);
+	repo_config_get_bool(repo, "core.prefersymlinkrefs", &refs->prefer_symlink_refs);
 
 	chdir_notify_reparent("files-backend $GIT_DIR", &refs->base.gitdir);
 	chdir_notify_reparent("files-backend $GIT_COMMONDIR",
@@ -2942,7 +2945,7 @@ static int files_transaction_finish(struct ref_store *ref_store,
 		 * We try creating a symlink, if that succeeds we continue to the
 		 * next update. If not, we try and create a regular symref.
 		 */
-		if (update->new_target && prefer_symlink_refs)
+		if (update->new_target && refs->prefer_symlink_refs)
 			if (!create_ref_symlink(lock, update->new_target))
 				continue;