environment: make `get_git_common_dir()` accept a repository

The `get_git_common_dir()` function retrieves the path to the common
directory for `the_repository`. Make it accept a `struct repository`
such that it can work on arbitrary repositories and make it part of the
repository subsystem. This reduces our reliance on `the_repository` and
clarifies scope.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/config.c

@@ -807,7 +807,7 @@ static void location_options_init(struct config_location_options *opts,
 	else
 		opts->options.respect_includes = opts->respect_includes_opt;
 	if (startup_info->have_repository) {
-		opts->options.commondir = get_git_common_dir();
+		opts->options.commondir = repo_get_common_dir(the_repository);
 		opts->options.git_dir = repo_get_git_dir(the_repository);
 	}
 }

builtin/gc.c

@@ -2132,7 +2132,7 @@ static int schtasks_schedule_task(const char *exec_path, enum schedule_priority
 	get_schedule_cmd(&cmd, NULL);
 
 	strbuf_addf(&tfilename, "%s/schedule_%s_XXXXXX",
-		    get_git_common_dir(), frequency);
+		    repo_get_common_dir(the_repository), frequency);
 	tfile = xmks_tempfile(tfilename.buf);
 	strbuf_release(&tfilename);
 

builtin/rev-parse.c

@@ -19,6 +19,7 @@
 #include "path.h"
 #include "diff.h"
 #include "read-cache-ll.h"
+#include "repository.h"
 #include "revision.h"
 #include "setup.h"
 #include "split-index.h"
@@ -1042,7 +1043,7 @@ int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 				continue;
 			}
 			if (!strcmp(arg, "--git-common-dir")) {
-				print_path(get_git_common_dir(), prefix, format, DEFAULT_RELATIVE_IF_SHARED);
+				print_path(repo_get_common_dir(the_repository), prefix, format, DEFAULT_RELATIVE_IF_SHARED);
 				continue;
 			}
 			if (!strcmp(arg, "--is-inside-git-dir")) {

builtin/worktree.c

@@ -219,7 +219,7 @@ static void prune_worktrees(void)
 	}
 	closedir(dir);
 
-	strbuf_add_absolute_path(&main_path, get_git_common_dir());
+	strbuf_add_absolute_path(&main_path, repo_get_common_dir(the_repository));
 	/* massage main worktree absolute path to match 'gitdir' content */
 	strbuf_strip_suffix(&main_path, "/.");
 	string_list_append_nodup(&kept, strbuf_detach(&main_path, NULL));
@@ -492,7 +492,7 @@ static int add_worktree(const char *path, const char *refname,
 	strbuf_addf(&sb, "%s/gitdir", sb_repo.buf);
 	strbuf_realpath(&realpath, sb_git.buf, 1);
 	write_file(sb.buf, "%s", realpath.buf);
-	strbuf_realpath(&realpath, get_git_common_dir(), 1);
+	strbuf_realpath(&realpath, repo_get_common_dir(the_repository), 1);
 	write_file(sb_git.buf, "gitdir: %s/worktrees/%s",
 		   realpath.buf, name);
 	strbuf_reset(&sb);

config.c

@@ -2213,7 +2213,7 @@ void read_early_config(config_fn_t cb, void *data)
 	opts.respect_includes = 1;
 
 	if (have_git_dir()) {
-		opts.commondir = get_git_common_dir();
+		opts.commondir = repo_get_common_dir(the_repository);
 		opts.git_dir = repo_get_git_dir(the_repository);
 	/*
 	 * When setup_git_directory() was not yet asked to discover the

environment.c

@@ -228,13 +228,6 @@ int have_git_dir(void)
 		|| the_repository->gitdir;
 }
 
-const char *get_git_common_dir(void)
-{
-	if (!the_repository->commondir)
-		BUG("git environment hasn't been setup");
-	return the_repository->commondir;
-}
-
 const char *get_git_namespace(void)
 {
 	if (!git_namespace)

environment.h

@@ -106,7 +106,6 @@ int have_git_dir(void);
 extern int is_bare_repository_cfg;
 int is_bare_repository(void);
 extern char *git_work_tree_cfg;
-const char *get_git_common_dir(void);
 const char *get_object_directory(void);
 char *get_index_file(void);
 char *get_graft_file(struct repository *r);

repository.c

@@ -98,6 +98,13 @@ const char *repo_get_git_dir(struct repository *repo)
 	return repo->gitdir;
 }
 
+const char *repo_get_common_dir(struct repository *repo)
+{
+	if (!repo->commondir)
+		BUG("repository hasn't been set up");
+	return repo->commondir;
+}
+
 static void repo_set_commondir(struct repository *repo,
 			       const char *commondir)
 {

repository.h

@@ -207,6 +207,7 @@ extern struct repository *the_repository;
 #endif
 
 const char *repo_get_git_dir(struct repository *repo);
+const char *repo_get_common_dir(struct repository *repo);
 
 /*
  * Define a custom repository layout. Any field can be NULL, which

setup.c

@@ -2068,7 +2068,7 @@ static void copy_templates(const char *option_template)
 		goto close_free_return;
 	}
 
-	strbuf_addstr(&path, get_git_common_dir());
+	strbuf_addstr(&path, repo_get_common_dir(the_repository));
 	strbuf_complete(&path, '/');
 	copy_templates_1(&path, &template_path, dir);
 close_free_return:

submodule.c

@@ -2462,7 +2462,7 @@ void absorb_git_dir_into_superproject(const char *path,
 	} else {
 		/* Is it already absorbed into the superprojects git dir? */
 		char *real_sub_git_dir = real_pathdup(sub_git_dir, 1);
-		char *real_common_git_dir = real_pathdup(get_git_common_dir(), 1);
+		char *real_common_git_dir = real_pathdup(repo_get_common_dir(the_repository), 1);
 
 		if (!starts_with(real_sub_git_dir, real_common_git_dir))
 			relocate_single_git_dir_into_superproject(path, super_prefix);

trace.c

@@ -315,7 +315,7 @@ void trace_repo_setup(void)
 		prefix = "(null)";
 
 	trace_printf_key(&trace_setup_key, "setup: git_dir: %s\n", quote_crnl(repo_get_git_dir(the_repository)));
-	trace_printf_key(&trace_setup_key, "setup: git_common_dir: %s\n", quote_crnl(get_git_common_dir()));
+	trace_printf_key(&trace_setup_key, "setup: git_common_dir: %s\n", quote_crnl(repo_get_common_dir(the_repository)));
 	trace_printf_key(&trace_setup_key, "setup: worktree: %s\n", quote_crnl(git_work_tree));
 	trace_printf_key(&trace_setup_key, "setup: cwd: %s\n", quote_crnl(cwd));
 	trace_printf_key(&trace_setup_key, "setup: prefix: %s\n", quote_crnl(prefix));

worktree.c

@@ -72,7 +72,7 @@ static struct worktree *get_main_worktree(int skip_reading_head)
 	struct worktree *worktree = NULL;
 	struct strbuf worktree_path = STRBUF_INIT;
 
-	strbuf_add_real_path(&worktree_path, get_git_common_dir());
+	strbuf_add_real_path(&worktree_path, repo_get_common_dir(the_repository));
 	strbuf_strip_suffix(&worktree_path, "/.git");
 
 	CALLOC_ARRAY(worktree, 1);
@@ -143,7 +143,7 @@ static struct worktree **get_worktrees_internal(int skip_reading_head)
 
 	list[counter++] = get_main_worktree(skip_reading_head);
 
-	strbuf_addf(&path, "%s/worktrees", get_git_common_dir());
+	strbuf_addf(&path, "%s/worktrees", repo_get_common_dir(the_repository));
 	dir = opendir(path.buf);
 	strbuf_release(&path);
 	if (dir) {
@@ -173,7 +173,7 @@ const char *get_worktree_git_dir(const struct worktree *wt)
 	if (!wt)
 		return repo_get_git_dir(the_repository);
 	else if (!wt->id)
-		return get_git_common_dir();
+		return repo_get_common_dir(the_repository);
 	else
 		return git_common_path("worktrees/%s", wt->id);
 }
@@ -626,7 +626,7 @@ static int is_main_worktree_path(const char *path)
 
 	strbuf_add_real_path(&target, path);
 	strbuf_strip_suffix(&target, "/.git");
-	strbuf_add_real_path(&maindir, get_git_common_dir());
+	strbuf_add_real_path(&maindir, repo_get_common_dir(the_repository));
 	strbuf_strip_suffix(&maindir, "/.git");
 	cmp = fspathcmp(maindir.buf, target.buf);