Re: [PATCH v6] repository: move fetch_if_missing into struct repository

> The global variable 'fetch_if_missing' controls whether a missing
> object check should prompt a lazy fetch from a promisor remote.
> In order to continue the libification effort, move it into
> 'struct repository' and initialize it to 1 by default to keep the
> previous behavior.
>
> builtin/fetch-pack.c, builtin/fsck.c, and builtin/rev-list.c are
> entered via commands marked RUN_SETUP in git.c:commands[]. Their
> 'repo' parameter is only NULL when '-h' is given outside of a
> repository, in which case either show_usage_if_asked() or
> parse_options()'s own '-h' handling exits the process before
> returning. We can therefore drop their UNUSED markers and assign
> to 'repo' directly.
>
> builtin/index-pack.c is entered via RUN_SETUP_GENTLY, so its
> 'repo' pointer can be NULL any time it is run outside of a
> repository, not only with '-h'. We keep a NULL check there and fall
> back to 'the_repository'.