#!/bin/sh

test_description='upload-pack ref-in-want'

. ./test-lib.sh

get_actual_refs () {
	sed -n -e '/wanted-refs/,/0001/{
		/wanted-refs/d
		/0001/d
		p
		}' <out | test-tool pkt-line unpack >actual_refs
}

get_actual_commits () {
	sed -n -e '/packfile/,/0000/{
		/packfile/d
		p
		}' <out | test-tool pkt-line unpack-sideband >o.pack &&
	git index-pack o.pack &&
	git verify-pack -v o.idx | grep commit | cut -c-40 | sort >actual_commits
}

check_output () {
	get_actual_refs &&
	test_cmp expected_refs actual_refs &&
	get_actual_commits &&
	test_cmp expected_commits actual_commits
}

# c(o/foo) d(o/bar)
#        \ /
#         b   e(baz)  f(master)
#          \__  |  __/
#             \ | /
#               a
test_expect_success 'setup repository' '
	test_commit a &&
	git checkout -b o/foo &&
	test_commit b &&
	test_commit c &&
	git checkout -b o/bar b &&
	test_commit d &&
	git checkout -b baz a &&
	test_commit e &&
	git checkout master &&
	test_commit f
'

test_expect_success 'config controls ref-in-want advertisement' '
	git serve --advertise-capabilities >out &&
	! grep -a ref-in-want out &&

	git config uploadpack.allowRefInWant false &&
	git serve --advertise-capabilities >out &&
	! grep -a ref-in-want out &&

	git config uploadpack.allowRefInWant true &&
	git serve --advertise-capabilities >out &&
	grep -a ref-in-want out
'

test_expect_success 'invalid want-ref line' '
	test-tool pkt-line pack >in <<-EOF &&
	command=fetch
	0001
	no-progress
	want-ref refs/heads/non-existent
	done
	0000
	EOF

	test_must_fail git serve --stateless-rpc 2>out <in &&
	grep "unknown ref" out
'

test_expect_success 'basic want-ref' '
	cat >expected_refs <<-EOF &&
	$(git rev-parse f) refs/heads/master
	EOF
	git rev-parse f | sort >expected_commits &&

	test-tool pkt-line pack >in <<-EOF &&
	command=fetch
	0001
	no-progress
	want-ref refs/heads/master
	have $(git rev-parse a)
	done
	0000
	EOF

	git serve --stateless-rpc >out <in &&
	check_output
'

test_expect_success 'multiple want-ref lines' '
	cat >expected_refs <<-EOF &&
	$(git rev-parse c) refs/heads/o/foo
	$(git rev-parse d) refs/heads/o/bar
	EOF
	git rev-parse c d | sort >expected_commits &&

	test-tool pkt-line pack >in <<-EOF &&
	command=fetch
	0001
	no-progress
	want-ref refs/heads/o/foo
	want-ref refs/heads/o/bar
	have $(git rev-parse b)
	done
	0000
	EOF

	git serve --stateless-rpc >out <in &&
	check_output
'

test_expect_success 'mix want and want-ref' '
	cat >expected_refs <<-EOF &&
	$(git rev-parse f) refs/heads/master
	EOF
	git rev-parse e f | sort >expected_commits &&

	test-tool pkt-line pack >in <<-EOF &&
	command=fetch
	0001
	no-progress
	want-ref refs/heads/master
	want $(git rev-parse e)
	have $(git rev-parse a)
	done
	0000
	EOF

	git serve --stateless-rpc >out <in &&
	check_output
'

test_expect_success 'want-ref with ref we already have commit for' '
	cat >expected_refs <<-EOF &&
	$(git rev-parse c) refs/heads/o/foo
	EOF
	>expected_commits &&

	test-tool pkt-line pack >in <<-EOF &&
	command=fetch
	0001
	no-progress
	want-ref refs/heads/o/foo
	have $(git rev-parse c)
	done
	0000
	EOF

	git serve --stateless-rpc >out <in &&
	check_output
'

. "$TEST_DIRECTORY"/lib-httpd.sh
start_httpd

REPO="$HTTPD_DOCUMENT_ROOT_PATH/repo"
LOCAL_PRISTINE="$(pwd)/local_pristine"

test_expect_success 'setup repos for change-while-negotiating test' '
	(
		git init "$REPO" &&
		cd "$REPO" &&
		>.git/git-daemon-export-ok &&
		test_commit m1 &&
		git tag -d m1 &&

		# Local repo with many commits (so that negotiation will take
		# more than 1 request/response pair)
		git clone "http://127.0.0.1:$LIB_HTTPD_PORT/smart/repo" "$LOCAL_PRISTINE" &&
		cd "$LOCAL_PRISTINE" &&
		git checkout -b side &&
		for i in $(test_seq 1 33); do test_commit s$i; done &&

		# Add novel commits to upstream
		git checkout master &&
		cd "$REPO" &&
		test_commit m2 &&
		test_commit m3 &&
		git tag -d m2 m3
	) &&
	git -C "$LOCAL_PRISTINE" remote set-url origin "http://127.0.0.1:$LIB_HTTPD_PORT/one_time_sed/repo" &&
	git -C "$LOCAL_PRISTINE" config protocol.version 2
'

inconsistency () {
	# Simulate that the server initially reports $2 as the ref
	# corresponding to $1, and after that, $1 as the ref corresponding to
	# $1. This corresponds to the real-life situation where the server's
	# repository appears to change during negotiation, for example, when
	# different servers in a load-balancing arrangement serve (stateless)
	# RPCs during a single negotiation.
	printf "s/%s/%s/" \
	       $(git -C "$REPO" rev-parse $1 | tr -d "\n") \
	       $(git -C "$REPO" rev-parse $2 | tr -d "\n") \
	       >"$HTTPD_ROOT_PATH/one-time-sed"
}

test_expect_success 'server is initially ahead - no ref in want' '
	git -C "$REPO" config uploadpack.allowRefInWant false &&
	rm -rf local &&
	cp -r "$LOCAL_PRISTINE" local &&
	inconsistency master 1234567890123456789012345678901234567890 &&
	test_must_fail git -C local fetch 2>err &&
	grep "ERR upload-pack: not our ref" err
'

test_expect_success 'server is initially ahead - ref in want' '
	git -C "$REPO" config uploadpack.allowRefInWant true &&
	rm -rf local &&
	cp -r "$LOCAL_PRISTINE" local &&
	inconsistency master 1234567890123456789012345678901234567890 &&
	git -C local fetch &&

	git -C "$REPO" rev-parse --verify master >expected &&
	git -C local rev-parse --verify refs/remotes/origin/master >actual &&
	test_cmp expected actual
'

test_expect_success 'server is initially behind - no ref in want' '
	git -C "$REPO" config uploadpack.allowRefInWant false &&
	rm -rf local &&
	cp -r "$LOCAL_PRISTINE" local &&
	inconsistency master "master^" &&
	git -C local fetch &&

	git -C "$REPO" rev-parse --verify "master^" >expected &&
	git -C local rev-parse --verify refs/remotes/origin/master >actual &&
	test_cmp expected actual
'

test_expect_success 'server is initially behind - ref in want' '
	git -C "$REPO" config uploadpack.allowRefInWant true &&
	rm -rf local &&
	cp -r "$LOCAL_PRISTINE" local &&
	inconsistency master "master^" &&
	git -C local fetch &&

	git -C "$REPO" rev-parse --verify "master" >expected &&
	git -C local rev-parse --verify refs/remotes/origin/master >actual &&
	test_cmp expected actual
'

test_expect_success 'server loses a ref - ref in want' '
	git -C "$REPO" config uploadpack.allowRefInWant true &&
	rm -rf local &&
	cp -r "$LOCAL_PRISTINE" local &&
	echo "s/master/raster/" >"$HTTPD_ROOT_PATH/one-time-sed" &&
	test_must_fail git -C local fetch 2>err &&

	grep "ERR unknown ref refs/heads/raster" err
'

stop_httpd

REPO="$(pwd)/repo"
LOCAL_PRISTINE="$(pwd)/local_pristine"

# $REPO
# c(o/foo) d(o/bar)
#        \ /
#         b   e(baz)  f(master)
#          \__  |  __/
#             \ | /
#               a
#
# $LOCAL_PRISTINE
#		s32(side)
#		|
#		.
#		.
#		|
#		a(master)
test_expect_success 'setup repos for fetching with ref-in-want tests' '
	(
		git init "$REPO" &&
		cd "$REPO" &&
		test_commit a &&

		# Local repo with many commits (so that negotiation will take
		# more than 1 request/response pair)
		rm -rf "$LOCAL_PRISTINE" &&
		git clone "file://$REPO" "$LOCAL_PRISTINE" &&
		cd "$LOCAL_PRISTINE" &&
		git checkout -b side &&
		for i in $(test_seq 1 33); do test_commit s$i; done &&

		# Add novel commits to upstream
		git checkout master &&
		cd "$REPO" &&
		git checkout -b o/foo &&
		test_commit b &&
		test_commit c &&
		git checkout -b o/bar b &&
		test_commit d &&
		git checkout -b baz a &&
		test_commit e &&
		git checkout master &&
		test_commit f
	) &&
	git -C "$REPO" config uploadpack.allowRefInWant true &&
	git -C "$LOCAL_PRISTINE" config protocol.version 2
'

test_expect_success 'fetching with exact OID' '
	test_when_finished "rm -f log" &&

	rm -rf local &&
	cp -r "$LOCAL_PRISTINE" local &&
	GIT_TRACE_PACKET="$(pwd)/log" git -C local fetch origin \
		$(git -C "$REPO" rev-parse d):refs/heads/actual &&

	git -C "$REPO" rev-parse "d" >expected &&
	git -C local rev-parse refs/heads/actual >actual &&
	test_cmp expected actual &&
	grep "want $(git -C "$REPO" rev-parse d)" log
'

test_expect_success 'fetching multiple refs' '
	test_when_finished "rm -f log" &&

	rm -rf local &&
	cp -r "$LOCAL_PRISTINE" local &&
	GIT_TRACE_PACKET="$(pwd)/log" git -C local fetch origin master baz &&

	git -C "$REPO" rev-parse "master" "baz" >expected &&
	git -C local rev-parse refs/remotes/origin/master refs/remotes/origin/baz >actual &&
	test_cmp expected actual &&
	grep "want-ref refs/heads/master" log &&
	grep "want-ref refs/heads/baz" log
'

test_expect_success 'fetching ref and exact OID' '
	test_when_finished "rm -f log" &&

	rm -rf local &&
	cp -r "$LOCAL_PRISTINE" local &&
	GIT_TRACE_PACKET="$(pwd)/log" git -C local fetch origin \
		master $(git -C "$REPO" rev-parse b):refs/heads/actual &&

	git -C "$REPO" rev-parse "master" "b" >expected &&
	git -C local rev-parse refs/remotes/origin/master refs/heads/actual >actual &&
	test_cmp expected actual &&
	grep "want $(git -C "$REPO" rev-parse b)" log &&
	grep "want-ref refs/heads/master" log
'

test_expect_success 'fetching with wildcard that does not match any refs' '
	test_when_finished "rm -f log" &&

	rm -rf local &&
	cp -r "$LOCAL_PRISTINE" local &&
	git -C local fetch origin refs/heads/none*:refs/heads/* >out &&
	test_must_be_empty out
'

test_expect_success 'fetching with wildcard that matches multiple refs' '
	test_when_finished "rm -f log" &&

	rm -rf local &&
	cp -r "$LOCAL_PRISTINE" local &&
	GIT_TRACE_PACKET="$(pwd)/log" git -C local fetch origin refs/heads/o*:refs/heads/o* &&

	git -C "$REPO" rev-parse "o/foo" "o/bar" >expected &&
	git -C local rev-parse "o/foo" "o/bar" >actual &&
	test_cmp expected actual &&
	grep "want-ref refs/heads/o/foo" log &&
	grep "want-ref refs/heads/o/bar" log
'

test_done
