Re: [PATCH v2 20/20] checkout: drop intimate knowledge of newly created worktree

> Now that git-worktree no longer relies upon git-checkout for new branch
> creation, new worktree HEAD set up, or initial worktree population,
> git-checkout no longer needs intimate knowledge that it may be operating
> in a newly created worktree. Therefore, drop 'new_worktree_mode' and the
> private GIT_CHECKOUT_NEW_WORKTREE environment variable by which
> git-worktree communicated to git-checkout that it was being invoked to
> manipulate a new worktree.
>
> This reverts the remaining changes to checkout.c by 529fef2 (checkout:
> support checking out into a new working directory, 2014-11-30).

> Signed-off-by: Eric Sunshine <sunshine@sunshineco.com>
> ---
>
> Changes since v1: reword commit message.
>
>  builtin/checkout.c | 9 ++-------
>  1 file changed, 2 insertions(+), 7 deletions(-)
>
> diff --git a/builtin/checkout.c b/builtin/checkout.c
> index 4ae895c..02d78ba 100644
> --- a/builtin/checkout.c
> +++ b/builtin/checkout.c
> @@ -48,8 +48,6 @@ struct checkout_opts {
>  	const char *prefix;
>  	struct pathspec pathspec;
>  	struct tree *source_tree;
> -
> -	int new_worktree_mode;
>  };
>  
>  static int post_checkout_hook(struct commit *old, struct commit *new,
> @@ -491,7 +489,7 @@ static int merge_working_tree(const struct checkout_opts *opts,
>  			topts.dir->flags |= DIR_SHOW_IGNORED;
>  			setup_standard_excludes(topts.dir);
>  		}
> -		tree = parse_tree_indirect(old->commit && !opts->new_worktree_mode ?
> +		tree = parse_tree_indirect(old->commit ?
>  					   old->commit->object.sha1 :
>  					   EMPTY_TREE_SHA1_BIN);
>  		init_tree_desc(&trees[0], tree->buffer, tree->size);
> @@ -807,8 +805,7 @@ static int switch_branches(const struct checkout_opts *opts,
>  		return ret;
>  	}
>  
> -	if (!opts->quiet && !old.path && old.commit &&
> -	    new->commit != old.commit && !opts->new_worktree_mode)
> +	if (!opts->quiet && !old.path && old.commit && new->commit != old.commit)
>  		orphaned_commit_warning(old.commit, new->commit);
>  
>  	update_refs_for_switch(opts, &old, new);
> @@ -1151,8 +1148,6 @@ int cmd_checkout(int argc, const char **argv, const char *prefix)
>  	argc = parse_options(argc, argv, prefix, options, checkout_usage,
>  			     PARSE_OPT_KEEP_DASHDASH);
>  
> -	opts.new_worktree_mode = getenv("GIT_CHECKOUT_NEW_WORKTREE") != NULL;
> -
>  	if (conflict_style) {
>  		opts.merge = 1; /* implied */
>  		git_xmerge_config("merge.conflictstyle", conflict_style, NULL);