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Re: [PATCH] diff: batch fetching of missing blobs




On Tue, Mar 26, 2019 at 03:09:06PM -0700, Jonathan Tan wrote:
> diff --git a/t/t4067-diff-partial-clone.sh b/t/t4067-diff-partial-clone.sh
> new file mode 100755
> index 0000000000..38f03be114
> --- /dev/null
> +++ b/t/t4067-diff-partial-clone.sh
> @@ -0,0 +1,76 @@
> +#!/bin/sh
> +
> +test_description='behavior of diff when reading objects in a partial clone'
> +
> +. ./test-lib.sh
> +
> +test_expect_success 'git show batches blobs' '
> +	test_create_repo server &&
> +	echo a >server/a &&
> +	echo b >server/b &&
> +	git -C server add a b &&
> +	git -C server commit -m x &&
> +
> +	test_config -C server uploadpack.allowfilter 1 &&
> +	test_config -C server uploadpack.allowanysha1inwant 1 &&
> +	git clone --bare --filter=blob:limit=0 "file://$(pwd)/server" client &&
> +
> +	# Ensure that there is exactly 1 negotiation by checking that there is
> +	# only 1 "done" line sent. ("done" marks the end of negotiation.)
> +	GIT_TRACE_PACKET="$(pwd)/trace" git -C client show HEAD &&
> +	grep "git> done" trace >done_lines &&
> +	test_line_count = 1 done_lines
> +'
> +
> +test_expect_success 'diff batches blobs' '
> +	rm -rf server client trace &&

Please use 'test_when_finished' in the previous test to clean up after
itself.

> +
> +	test_create_repo server &&
> +	echo a >server/a &&
> +	echo b >server/b &&
> +	git -C server add a b &&
> +	git -C server commit -m x &&
> +	echo c >server/c &&
> +	echo d >server/d &&
> +	git -C server add c d &&
> +	git -C server commit -m x &&
> +
> +	test_config -C server uploadpack.allowfilter 1 &&
> +	test_config -C server uploadpack.allowanysha1inwant 1 &&
> +	git clone --bare --filter=blob:limit=0 "file://$(pwd)/server" client &&
> +
> +	# Ensure that there is exactly 1 negotiation by checking that there is
> +	# only 1 "done" line sent. ("done" marks the end of negotiation.)
> +	GIT_TRACE_PACKET="$(pwd)/trace" git -C client diff HEAD^ HEAD &&
> +	grep "git> done" trace >done_lines &&
> +	test_line_count = 1 done_lines
> +'
> +
> +test_expect_success 'diff skips same-OID blobs' '
> +	rm -rf server client trace &&

Likewise.

> +	test_create_repo server &&
> +	echo a >server/a &&
> +	echo b >server/b &&
> +	git -C server add a b &&
> +	git -C server commit -m x &&
> +	echo another-a >server/a &&
> +	git -C server add a &&
> +	git -C server commit -m x &&
> +
> +	test_config -C server uploadpack.allowfilter 1 &&
> +	test_config -C server uploadpack.allowanysha1inwant 1 &&
> +	git clone --bare --filter=blob:limit=0 "file://$(pwd)/server" client &&
> +
> +	echo a | git hash-object --stdin >hash-old-a &&
> +	echo another-a | git hash-object --stdin >hash-new-a &&
> +	echo b | git hash-object --stdin >hash-b &&
> +
> +	# Ensure that only a and another-a are fetched.
> +	GIT_TRACE_PACKET="$(pwd)/trace" git -C client diff HEAD^ HEAD &&
> +	grep "want $(cat hash-old-a)" trace &&
> +	grep "want $(cat hash-new-a)" trace &&
> +	! grep "want $(cat hash-b)" trace
> +'
> +
> +test_done
> -- 
> 2.21.0.155.ge902e9bcae.dirty
>