As far as I can tell the only way to clone a given upstream repo,
which has an unknown main branch name without any tags is:

    git clone --single-branch <url> <repo> &&
    cd <repo> &&
    git tag -d $(git tag -l) &&
    git config remote.origin.tagOpt --no-tags

Is there really nothing like:

    git clone --single-branch --no-tags <url> <repo>

?

I suppose this can be done with the usual 'git init`, set the config &
then fetch dance, but in that case what part of 'git remote' or
friends exposes finding the remote "main" ref as --single-branch does?