Re: [PATCH v3 6/6] worktree: copy sparse-checkout patterns and config on add

> When adding a new worktree, it is reasonable to expect that we want to
> use the current set of sparse-checkout settings for that new worktree.
> This is particularly important for repositories where the worktree would
> become too large to be useful. This is even more important when using
> partial clone as well, since we want to avoid downloading the missing
> blobs for files that should not be written to the new worktree.
>
> The only way to create such a worktree without this intermediate step of
> expanding the full worktree is to copy the sparse-checkout patterns and
> config settings during 'git worktree add'. Each worktree has its own
> sparse-checkout patterns, and the default behavior when the
> sparse-checkout file is missing is to include all paths at HEAD. Thus,
> we need to have patterns from somewhere, they might as well be the
> current worktree's patterns. These are then modified independently in
> the future.
>
> In addition to the sparse-checkout file, copy the worktree config file
> if worktree config is enabled and the file exists. This will copy over
> any important settings to ensure the new worktree behaves the same as
> the current one.

> Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
> ---
> diff --git a/builtin/worktree.c b/builtin/worktree.c
> @@ -336,6 +336,47 @@ static int add_worktree(const char *path, const char *refname,
> +       /*
> +        * If we are using worktree config, then copy all currenct config
> +        * values from the current worktree into the new one, that way the
> +        * new worktree behaves the same as this one.
> +        */

> +       if (repository_format_worktree_config) {
> +               char *from_file = git_pathdup("config.worktree");
> +               char *to_file = xstrfmt("%s/worktrees/%s/config.worktree",
> +                                       realpath.buf, name);
> +
> +               if (file_exists(from_file)) {
> +                       if (safe_create_leading_directories(to_file) ||
> +                           copy_file(to_file, from_file, 0666))
> +                               error(_("failed to copy worktree config from '%s' to '%s'"),
> +                                     from_file, to_file);
> +               }