$ git submodule foreach "git pull"
Entering 'home/.tmux/plugins/tmux-resurrect'
WARNING: gnome-keyring:: couldn't connect to: /tmp/keyring-hhPpwz/pkcs11: Permission denied
You are not currently on a branch. Please specify which
branch you want to merge with. See git-pull(1) for details.

    git pull <remote> <branch>

Stopping at 'home/.tmux/plugins/tmux-resurrect'; script returned non-zero status.