Fwd: Submodules & worktree

Adding a worktree from a working copy with submodules doesn't work.

In the config file I have
    [submodule]
        recurse = true

It that's not present, I don't find the problem.

# Preparation

$ git --version git version 2.20.1

$ cd /tmp/

$ git init main_repo Initialized empty Git repository in /tmp/main_repo/.git/

$ git init repo_submod Initialized empty Git repository in /tmp/repo_submod/.git/

$ cd repo_submod

$ echo Some text > file.txt

$ git add file.txt

$ git ci -m "First commit in subrepo"
[master (root-commit) ebc9325] First commit in subrepo
 1 file changed, 1 insertion(+)
 create mode 100644 file.txt

$ cd ../main_repo/

$ git submodule add /tmp/repo_submod submod Cloning into '/tmp/main_repo/submod'... done.

$ git ci -am "First commit, add submodule"
[master (root-commit) 695b3a1] First commit, add submodule
 2 files changed, 4 insertions(+)
 create mode 100644 .gitmodules
 create mode 160000 submod

# Problem 1 (can't run worktree add)

$ git worktree add ../wt -b new_branch Preparing worktree (new branch 'new_branch') fatal: exec '--super-prefix=submod/': cd to 'submod' failed: No such file or directory error: Submodule 'submod' could not be updated. error: Submodule 'submod' cannot checkout new HEAD. fatal: Could not reset index file to revision 'HEAD'.

The new directory (../wt) is created and removed (seen with strace). The new branch is created and not removed.

# Problem 2 (submodule status seems not to detect some cases)

$ pwd /tmp/main_repo

$ git submodule status
 ebc9325f7b19164c9bdfd05263481ded66d7bd7d submod (heads/master)

$ rm submod/file.txt submod/.git

$ git submodule status
 ebc9325f7b19164c9bdfd05263481ded66d7bd7d submod

So, I have a plain, empty directory where the submodule should be. Not having any 'first char', I'd expect it to be checked out and up to date. Is this expected?

Thanks a lot for the work!