path: remove repository argument from worktree_git_path()

worktree_git_path() takes a struct repository and a struct worktree
which also contains a struct repository. The repository argument
was added by a973f60dc7 (path: stop relying on `the_repository` in
`worktree_git_path()`, 2024-08-13) and exists because the worktree
argument is optional. Having two ways of passing a repository is
a potential foot-gun as if the the worktree argument is present the
repository argument must match the worktree's repository member. Since
the last commit there are no callers that pass a NULL worktree so lets
remove the repository argument. This removes the potential confusion
and lets us delete a number of uses of "the_repository".

worktree_git_path() has the following callers:

 - builtin/worktree.c:validate_no_submodules() which is called from
   check_clean_worktree() and move_worktree(), both of which supply
   a non-NULL worktree.

 - builtin/fsck.c:cmd_fsck() which loops over all worktrees.

 - revision.c:add_index_objects_to_pending() which loops over all
   worktrees.

 - worktree.c:worktree_lock_reason() which dereferences wt before
   calling worktree_git_path().

 - wt-status.c:wt_status_check_bisect() and wt_status_check_rebase()
   which are always called with a non-NULL worktree after the last
   commit.

 - wt-status.c:git_branch() which is only called by
   wt_status_check_bisect() and wt_status_check_rebase().

Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/fsck.c

@@ -1137,7 +1137,7 @@ int cmd_fsck(int argc,
 			 * and may get overwritten by other calls
 			 * while we're examining the index.
 			 */
-			path = xstrdup(worktree_git_path(the_repository, wt, "index"));
+			path = xstrdup(worktree_git_path(wt, "index"));
 			wt_gitdir = get_worktree_git_dir(wt);
 
 			read_index_from(&istate, path, wt_gitdir);

builtin/worktree.c

@@ -1191,14 +1191,14 @@ static void validate_no_submodules(const struct worktree *wt)
 
 	wt_gitdir = get_worktree_git_dir(wt);
 
-	if (is_directory(worktree_git_path(the_repository, wt, "modules"))) {
+	if (is_directory(worktree_git_path(wt, "modules"))) {
 		/*
 		 * There could be false positives, e.g. the "modules"
 		 * directory exists but is empty. But it's a rare case and
 		 * this simpler check is probably good enough for now.
 		 */
 		found_submodules = 1;
-	} else if (read_index_from(&istate, worktree_git_path(the_repository, wt, "index"),
+	} else if (read_index_from(&istate, worktree_git_path(wt, "index"),
 				   wt_gitdir) > 0) {
 		for (i = 0; i < istate.cache_nr; i++) {
 			struct cache_entry *ce = istate.cache[i];

path.c

@@ -486,17 +486,16 @@ const char *mkpath(const char *fmt, ...)
 	return cleanup_path(pathname->buf);
 }
 
-const char *worktree_git_path(struct repository *r,
-			      const struct worktree *wt, const char *fmt, ...)
+const char *worktree_git_path(const struct worktree *wt, const char *fmt, ...)
 {
 	struct strbuf *pathname = get_pathname();
 	va_list args;
 
-	if (wt && wt->repo != r)
-		BUG("worktree not connected to expected repository");
+	if (!wt)
+		BUG("%s() called with NULL worktree", __func__);
 
 	va_start(args, fmt);
-	repo_git_pathv(r, wt, pathname, fmt, args);
+	repo_git_pathv(wt->repo, wt, pathname, fmt, args);
 	va_end(args);
 	return pathname->buf;
 }

path.h

@@ -66,13 +66,11 @@ const char *repo_git_path_replace(struct repository *repo,
 
 /*
  * Similar to repo_git_path() but can produce paths for a specified
- * worktree instead of current one. When no worktree is given, then the path is
- * computed relative to main worktree of the given repository.
+ * worktree instead of current one.
  */
-const char *worktree_git_path(struct repository *r,
-			      const struct worktree *wt,
+const char *worktree_git_path(const struct worktree *wt,
 			      const char *fmt, ...)
-	__attribute__((format (printf, 3, 4)));
+	__attribute__((format (printf, 2, 3)));
 
 /*
  * The `repo_worktree_path` family of functions will construct a path into a

revision.c

@@ -1847,7 +1847,7 @@ void add_index_objects_to_pending(struct rev_info *revs, unsigned int flags)
 		wt_gitdir = get_worktree_git_dir(wt);
 
 		if (read_index_from(&istate,
-				    worktree_git_path(the_repository, wt, "index"),
+				    worktree_git_path(wt, "index"),
 				    wt_gitdir) > 0)
 			do_add_index_objects_to_pending(revs, &istate, flags);
 

worktree.c

@@ -308,7 +308,7 @@ const char *worktree_lock_reason(struct worktree *wt)
 	if (!wt->lock_reason_valid) {
 		struct strbuf path = STRBUF_INIT;
 
-		strbuf_addstr(&path, worktree_git_path(the_repository, wt, "locked"));
+		strbuf_addstr(&path, worktree_git_path(wt, "locked"));
 		if (file_exists(path.buf)) {
 			struct strbuf lock_reason = STRBUF_INIT;
 			if (strbuf_read_file(&lock_reason, path.buf, 0) < 0)

wt-status.c

@@ -1624,7 +1624,7 @@ static char *get_branch(const struct worktree *wt, const char *path)
 	struct object_id oid;
 	const char *branch_name;
 
-	if (strbuf_read_file(&sb, worktree_git_path(the_repository, wt, "%s", path), 0) <= 0)
+	if (strbuf_read_file(&sb, worktree_git_path(wt, "%s", path), 0) <= 0)
 		goto got_nothing;
 
 	while (sb.len && sb.buf[sb.len - 1] == '\n')
@@ -1726,18 +1726,18 @@ int wt_status_check_rebase(const struct worktree *wt,
 	if (!wt)
 		BUG("wt_status_check_rebase() called with NULL worktree");
 
-	if (!stat(worktree_git_path(the_repository, wt, "rebase-apply"), &st)) {
-		if (!stat(worktree_git_path(the_repository, wt, "rebase-apply/applying"), &st)) {
+	if (!stat(worktree_git_path(wt, "rebase-apply"), &st)) {
+		if (!stat(worktree_git_path(wt, "rebase-apply/applying"), &st)) {
 			state->am_in_progress = 1;
-			if (!stat(worktree_git_path(the_repository, wt, "rebase-apply/patch"), &st) && !st.st_size)
+			if (!stat(worktree_git_path(wt, "rebase-apply/patch"), &st) && !st.st_size)
 				state->am_empty_patch = 1;
 		} else {
 			state->rebase_in_progress = 1;
 			state->branch = get_branch(wt, "rebase-apply/head-name");
 			state->onto = get_branch(wt, "rebase-apply/onto");
 		}
-	} else if (!stat(worktree_git_path(the_repository, wt, "rebase-merge"), &st)) {
-		if (!stat(worktree_git_path(the_repository, wt, "rebase-merge/interactive"), &st))
+	} else if (!stat(worktree_git_path(wt, "rebase-merge"), &st)) {
+		if (!stat(worktree_git_path(wt, "rebase-merge/interactive"), &st))
 			state->rebase_interactive_in_progress = 1;
 		else
 			state->rebase_in_progress = 1;
@@ -1756,7 +1756,7 @@ int wt_status_check_bisect(const struct worktree *wt,
 	if (!wt)
 		BUG("wt_status_check_bisect() called with NULL worktree");
 
-	if (!stat(worktree_git_path(the_repository, wt, "BISECT_LOG"), &st)) {
+	if (!stat(worktree_git_path(wt, "BISECT_LOG"), &st)) {
 		state->bisect_in_progress = 1;
 		state->bisecting_from = get_branch(wt, "BISECT_START");
 		return 1;