Re: [PATCH v2] fetch: remove fetch_if_missing=0

[Junio C Hamano <gitster@pobox.com>]

Jonathan Tan <jonathantanmy@google.com> writes:

> In fetch_pack() (and all functions it calls), pass
> OBJECT_INFO_SKIP_FETCH_OBJECT whenever we query an object that could be
> a tree or blob that we do not want to be lazy-fetched even if it is
> absent. Thus, the only lazy-fetches occurring for trees and blobs are
> when resolving deltas.
>
> Thus, we can remove fetch_if_missing=0 from builtin/fetch.c. Remove
> this, and also add a test ensuring that such objects are not
> lazy-fetched. (We might be able to remove fetch_if_missing=0 from other
> places too, but I have limited myself to builtin/fetch.c in this commit
> because I have not written tests for the other commands yet.)
>
> Note that commits and tags may still be lazy-fetched. I limited myself
> to objects that could be trees or blobs here because Git does not
> support creating such commit- and tag-excluding clones yet, and even if
> such a clone were manually created, Git does not have good support for
> fetching a single commit (when fetching a commit, it and all its
> ancestors would be sent).
>
> Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
> ---
> Changes from v1:
> - Added NEEDSWORK in test, suggested by Jonathan Nieder
> - Used printf in test, suggested by Eric Sunshine

Nice.  The less we use big "plug the machinery to lazily fetch for
now" switch, the better, I think.

> +setup_triangle () {
> +	rm -rf big-blob.txt server client promisor-remote &&
> +
> +	printf "line %d\n" $(test_seq 1 100) >big-blob.txt

I'll tweak this line while queueing with a trailing " &&" (no need
to resend only for this).