checkout: require worktree unconditionally
In order to allow linked worktree creation via "git checkout --to" from a bare repository, 3473ad0c (checkout: don't require a work tree when checking out into a new one, 2014-11-30) dropped git-checkout's unconditional NEED_WORK_TREE requirement and instead performed worktree setup conditionally based upon presence or absence of the --to option. Now that --to has been retired and git-checkout is no longer responsible for linked worktree creation, the NEED_WORK_TREE requirement can be re-instated. This effectively reverts 3473ad0c, except for the tests it added which now check bare repository behavior of "git worktree add" instead. Signed-off-by: NEric Sunshine <sunshine@sunshineco.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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