replace strbuf_addstr(git_path()) with git_path_buf()

Writing directly into the strbuf avoids a useless copy of
the data, and dropping calls to git_path() makes it easier
to audit for dangerous calls.

Note that git_path() does an implicit strbuf_reset(), but in
each of these cases we were either already doing that reset,
or writing into a fresh strbuf anyway.

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

builtin/worktree.c

@@ -106,8 +106,7 @@ static void prune_worktrees(void)
 			printf("%s\n", reason.buf);
 		if (show_only)
 			continue;
-		strbuf_reset(&path);
-		strbuf_addstr(&path, git_path("worktrees/%s", d->d_name));
+		git_path_buf(&path, "worktrees/%s", d->d_name);
 		ret = remove_dir_recursively(&path, 0);
 		if (ret < 0 && errno == ENOTDIR)
 			ret = unlink(path.buf);
@@ -215,8 +214,7 @@ static int add_worktree(const char *path, const char *refname,
 	}
 
 	name = worktree_basename(path, &len);
-	strbuf_addstr(&sb_repo,
-		      git_path("worktrees/%.*s", (int)(path + len - name), name));
+	git_path_buf(&sb_repo, "worktrees/%.*s", (int)(path + len - name), name);
 	len = sb_repo.len;
 	if (safe_create_leading_directories_const(sb_repo.buf))
 		die_errno(_("could not create leading directories of '%s'"),

notes-merge.c

@@ -676,7 +676,7 @@ int notes_merge_commit(struct notes_merge_options *o,
 	const char *msg = strstr(buffer, "\n\n");
 	int baselen;
 
-	strbuf_addstr(&path, git_path(NOTES_MERGE_WORKTREE));
+	git_path_buf(&path, NOTES_MERGE_WORKTREE);
 	if (o->verbosity >= 3)
 		printf("Committing notes in notes merge worktree at %s\n",
 			path.buf);
@@ -741,7 +741,7 @@ int notes_merge_abort(struct notes_merge_options *o)
 	struct strbuf buf = STRBUF_INIT;
 	int ret;
 
-	strbuf_addstr(&buf, git_path(NOTES_MERGE_WORKTREE));
+	git_path_buf(&buf, NOTES_MERGE_WORKTREE);
 	if (o->verbosity >= 3)
 		printf("Removing notes merge worktree at %s/*\n", buf.buf);
 	ret = remove_dir_recursively(&buf, REMOVE_DIR_KEEP_TOPLEVEL);