Merge branch 'es/clone-shared-worktree'

"git clone --shared" to borrow from a (secondary) worktree did not
work, even though "git clone --local" did.  Both are now accepted.

* es/clone-shared-worktree:
  clone: support 'clone --shared' from a worktree

Author: gitster

builtin/clone.c

@@ -452,7 +452,8 @@ static void clone_local(const char *src_repo, const char *dest_repo)
 {
 	if (option_shared) {
 		struct strbuf alt = STRBUF_INIT;
-		strbuf_addf(&alt, "%s/objects", src_repo);
+		get_common_dir(&alt, src_repo);
+		strbuf_addstr(&alt, "/objects");
 		add_to_alternates_file(alt.buf);
 		strbuf_release(&alt);
 	} else {

t/t2025-worktree-add.sh

@@ -245,6 +245,12 @@ test_expect_success 'local clone from linked checkout' '
 	( cd here-clone && git fsck )
 '
 
+test_expect_success 'local clone --shared from linked checkout' '
+	git -C bare worktree add --detach ../baretree &&
+	git clone --local --shared baretree bare-clone &&
+	grep /bare/ bare-clone/.git/objects/info/alternates
+'
+
 test_expect_success '"add" worktree with --no-checkout' '
 	git worktree add --no-checkout -b swamp swamp &&
 	! test -e swamp/init.t &&