Re: [PATCH v7 8/8] branch: protect branches checked out in all worktrees

>
> Refuse to force-move a branch over the currently checked out branch of
> any working tree, not just the current one.
>
> Signed-off-by: Anders Kaseorg <andersk@mit.edu>
> ---
>  branch.c          | 13 +++++++++----
>  t/t3200-branch.sh |  7 +++++++
>  2 files changed, 16 insertions(+), 4 deletions(-)
>
> diff --git a/branch.c b/branch.c
> index c66b222abd..2cfe496d24 100644
> --- a/branch.c
> +++ b/branch.c
> @@ -199,7 +199,8 @@ int validate_branchname(const char *name, struct strbuf *ref)
>   */
>  int validate_new_branchname(const char *name, struct strbuf *ref, int force)
>  {
> -       const char *head;
> +       struct worktree **worktrees;
> +       const struct worktree *wt;
>
>         if (!validate_branchname(name, ref))
>                 return 0;
> @@ -208,9 +209,13 @@ int validate_new_branchname(const char *name, struct strbuf *ref, int force)
>                 die(_("a branch named '%s' already exists"),
>                     ref->buf + strlen("refs/heads/"));
>
> -       head = resolve_ref_unsafe("HEAD", 0, NULL, NULL);
> -       if (!is_bare_repository() && head && !strcmp(head, ref->buf))
> -               die(_("cannot force update the current branch"));
> +       worktrees = get_worktrees();
> +       wt = find_shared_symref(worktrees, "HEAD", ref->buf);
> +       if (wt && !wt->is_bare)
> +               die(_("cannot force update the branch '%s'"
> +                     "checked out at '%s'"),