Re: [PATCH v2 5/5] branch -d: refuse deleting a branch which is currently checked out

> On Fri, Mar 25, 2016 at 2:28 PM, Kazuki Yamaguchi <k@rhe.jp> wrote:
> > When a branch is checked out by current working tree, deleting the
> > branch is forbidden. However when the branch is checked out only by
> > other working trees, deleting is allowed.
> > Use find_shared_symref() to check if the branch is in use, not just
> > comparing with the current working tree's HEAD.
> >
> > Signed-off-by: Kazuki Yamaguchi <k@rhe.jp>
> > ---
> > diff --git a/builtin/branch.c b/builtin/branch.c
> > @@ -215,16 +216,17 @@ static int delete_branches(int argc, const char **argv, int force, int kinds,
> >                 int flags = 0;
> >
> >                 strbuf_branchname(&bname, argv[i]);
> > -               if (kinds == FILTER_REFS_BRANCHES && !strcmp(head, bname.buf)) {
> > +               free(name);
> > +               name = mkpathdup(fmt, bname.buf);
> > +
> > +               if (kinds == FILTER_REFS_BRANCHES &&
> > +                   find_shared_symref("HEAD", name)) {
> >                         error(_("Cannot delete the branch '%s' "
> > -                             "which you are currently on."), bname.buf);
> > +                             "which is currently checked out."), bname.buf);
> 
> Would it be possible to do a better job of letting the user know what
> went wrong by stating in which worktree(s) the branch is checked out?
> My concern is that someone seeing this message might respond "huh? I
> have 'master' checked out, so why is this telling me that 'foo' is
> checked out", and not realize that 'foo' is in fact checked out in a
> different worktree.