setup: unify repository version callbacks

Once upon a time, check_repository_format_gently would parse
the config with a single callback, and that callback would
set up a bunch of global variables. But now that we have
separate workdirs, we have to be more careful. Commit
31e26eb (setup.c: support multi-checkout repo setup,
2014-11-30) introduced a reduced callback which omits some
values like core.worktree. In the "main" callback we call
the reduced one, and then add back in the missing variables.

Now that we have split the config-parsing from the munging
of the global variables, we can do it all with a single
callback, and keep all of the "are we in a separate workdir"
logic together.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: peff

cache.h

@@ -1582,7 +1582,6 @@ extern void git_config_set_multivar_in_file(const char *, const char *, const ch
 extern int git_config_rename_section(const char *, const char *);
 extern int git_config_rename_section_in_file(const char *, const char *, const char *);
 extern const char *git_etc_gitconfig(void);
-extern int check_repository_format_version(const char *var, const char *value, void *cb);
 extern int git_env_bool(const char *, int);
 extern unsigned long git_env_ulong(const char *, unsigned long);
 extern int git_config_system(void);

setup.c

@@ -388,27 +388,26 @@ static int check_repo_format(const char *var, const char *value, void *vdata)
 			data->precious_objects = git_config_bool(var, value);
 		else
 			string_list_append(&data->unknown_extensions, ext);
+	} else if (strcmp(var, "core.bare") == 0) {
+		data->is_bare = git_config_bool(var, value);
+	} else if (strcmp(var, "core.worktree") == 0) {
+		if (!value)
+			return config_error_nonbool(var);
+		data->work_tree = xstrdup(value);
 	}
 	return 0;
 }
 
-static int read_repository_format_1(struct repository_format *, config_fn_t,
-				    const char *);
-
 static int check_repository_format_gently(const char *gitdir, int *nongit_ok)
 {
 	struct strbuf sb = STRBUF_INIT;
 	struct strbuf err = STRBUF_INIT;
 	struct repository_format candidate;
-	config_fn_t fn;
-
-	if (get_common_dir(&sb, gitdir))
-		fn = check_repo_format;
-	else
-		fn = check_repository_format_version;
+	int has_common;
 
+	has_common = get_common_dir(&sb, gitdir);
 	strbuf_addstr(&sb, "/config");
-	read_repository_format_1(&candidate, fn, sb.buf);
+	read_repository_format(&candidate, sb.buf);
 	strbuf_release(&sb);
 
 	/*
@@ -432,36 +431,34 @@ static int check_repository_format_gently(const char *gitdir, int *nongit_ok)
 	repository_format_version = candidate.version;
 	repository_format_precious_objects = candidate.precious_objects;
 	string_list_clear(&candidate.unknown_extensions, 0);
-	if (candidate.is_bare != -1) {
-		is_bare_repository_cfg = candidate.is_bare;
-		if (is_bare_repository_cfg == 1)
+	if (!has_common) {
+		if (candidate.is_bare != -1) {
+			is_bare_repository_cfg = candidate.is_bare;
+			if (is_bare_repository_cfg == 1)
+				inside_work_tree = -1;
+		}
+		if (candidate.work_tree) {
+			free(git_work_tree_cfg);
+			git_work_tree_cfg = candidate.work_tree;
 			inside_work_tree = -1;
-	}
-	if (candidate.work_tree) {
-		free(git_work_tree_cfg);
-		git_work_tree_cfg = candidate.work_tree;
-		inside_work_tree = -1;
+		}
+	} else {
+		free(candidate.work_tree);
 	}
 
 	return 0;
 }
 
-static int read_repository_format_1(struct repository_format *format,
-				    config_fn_t fn, const char *path)
+int read_repository_format(struct repository_format *format, const char *path)
 {
 	memset(format, 0, sizeof(*format));
 	format->version = -1;
 	format->is_bare = -1;
 	string_list_init(&format->unknown_extensions, 1);
-	git_config_from_file(fn, path, format);
+	git_config_from_file(check_repo_format, path, format);
 	return format->version;
 }
 
-int read_repository_format(struct repository_format *format, const char *path)
-{
-	return read_repository_format_1(format, check_repository_format_version, path);
-}
-
 int verify_repository_format(const struct repository_format *format,
 			     struct strbuf *err)
 {
@@ -999,22 +996,6 @@ int git_config_perm(const char *var, const char *value)
 	return -(i & 0666);
 }
 
-int check_repository_format_version(const char *var, const char *value, void *cb)
-{
-	struct repository_format *data = cb;
-	int ret = check_repo_format(var, value, cb);
-	if (ret)
-		return ret;
-	if (strcmp(var, "core.bare") == 0) {
-		data->is_bare = git_config_bool(var, value);
-	} else if (strcmp(var, "core.worktree") == 0) {
-		if (!value)
-			return config_error_nonbool(var);
-		data->work_tree = xstrdup(value);
-	}
-	return 0;
-}
-
 void check_repository_format(void)
 {
 	check_repository_format_gently(get_git_dir(), NULL);