Merge branch 'bw/protocol-v2'

The beginning of the next-gen transfer protocol.

* bw/protocol-v2: (35 commits)
  remote-curl: don't request v2 when pushing
  remote-curl: implement stateless-connect command
  http: eliminate "# service" line when using protocol v2
  http: don't always add Git-Protocol header
  http: allow providing extra headers for http requests
  remote-curl: store the protocol version the server responded with
  remote-curl: create copy of the service name
  pkt-line: add packet_buf_write_len function
  transport-helper: introduce stateless-connect
  transport-helper: refactor process_connect_service
  transport-helper: remove name parameter
  connect: don't request v2 when pushing
  connect: refactor git_connect to only get the protocol version once
  fetch-pack: support shallow requests
  fetch-pack: perform a fetch using v2
  upload-pack: introduce fetch server command
  push: pass ref prefixes when pushing
  fetch: pass ref prefixes when fetching
  ls-remote: pass ref prefixes when requesting a remote's refs
  transport: convert transport_get_remote_refs to take a list of ref prefixes
  ...

1 files changed, 273 insertions, 0 deletions

diff --git a/t/t5702-protocol-v2.sh b/t/t5702-protocol-v2.sh
new file mode 100755
index 0000000000..56f7c3c326
--- /dev/null
+++ b/t/t5702-protocol-v2.sh
@@ -0,0 +1,273 @@
+#!/bin/sh
+
+test_description='test git wire-protocol version 2'
+
+TEST_NO_CREATE_REPO=1
+
+. ./test-lib.sh
+
+# Test protocol v2 with 'git://' transport
+#
+. "$TEST_DIRECTORY"/lib-git-daemon.sh
+start_git_daemon --export-all --enable=receive-pack
+daemon_parent=$GIT_DAEMON_DOCUMENT_ROOT_PATH/parent
+
+test_expect_success 'create repo to be served by git-daemon' '
+	git init "$daemon_parent" &&
+	test_commit -C "$daemon_parent" one
+'
+
+test_expect_success 'list refs with git:// using protocol v2' '
+	test_when_finished "rm -f log" &&
+
+	GIT_TRACE_PACKET="$(pwd)/log" git -c protocol.version=2 \
+		ls-remote --symref "$GIT_DAEMON_URL/parent" >actual &&
+
+	# Client requested to use protocol v2
+	grep "git> .*\\\0\\\0version=2\\\0$" log &&
+	# Server responded using protocol v2
+	grep "git< version 2" log &&
+
+	git ls-remote --symref "$GIT_DAEMON_URL/parent" >expect &&
+	test_cmp actual expect
+'
+
+test_expect_success 'ref advertisment is filtered with ls-remote using protocol v2' '
+	test_when_finished "rm -f log" &&
+
+	GIT_TRACE_PACKET="$(pwd)/log" git -c protocol.version=2 \
+		ls-remote "$GIT_DAEMON_URL/parent" master >actual &&
+
+	cat >expect <<-EOF &&
+	$(git -C "$daemon_parent" rev-parse refs/heads/master)$(printf "\t")refs/heads/master
+	EOF
+
+	test_cmp actual expect
+'
+
+test_expect_success 'clone with git:// using protocol v2' '
+	test_when_finished "rm -f log" &&
+
+	GIT_TRACE_PACKET="$(pwd)/log" git -c protocol.version=2 \
+		clone "$GIT_DAEMON_URL/parent" daemon_child &&
+
+	git -C daemon_child log -1 --format=%s >actual &&
+	git -C "$daemon_parent" log -1 --format=%s >expect &&
+	test_cmp expect actual &&
+
+	# Client requested to use protocol v2
+	grep "clone> .*\\\0\\\0version=2\\\0$" log &&
+	# Server responded using protocol v2
+	grep "clone< version 2" log
+'
+
+test_expect_success 'fetch with git:// using protocol v2' '
+	test_when_finished "rm -f log" &&
+
+	test_commit -C "$daemon_parent" two &&
+
+	GIT_TRACE_PACKET="$(pwd)/log" git -C daemon_child -c protocol.version=2 \
+		fetch &&
+
+	git -C daemon_child log -1 --format=%s origin/master >actual &&
+	git -C "$daemon_parent" log -1 --format=%s >expect &&
+	test_cmp expect actual &&
+
+	# Client requested to use protocol v2
+	grep "fetch> .*\\\0\\\0version=2\\\0$" log &&
+	# Server responded using protocol v2
+	grep "fetch< version 2" log
+'
+
+test_expect_success 'pull with git:// using protocol v2' '
+	test_when_finished "rm -f log" &&
+
+	GIT_TRACE_PACKET="$(pwd)/log" git -C daemon_child -c protocol.version=2 \
+		pull &&
+
+	git -C daemon_child log -1 --format=%s >actual &&
+	git -C "$daemon_parent" log -1 --format=%s >expect &&
+	test_cmp expect actual &&
+
+	# Client requested to use protocol v2
+	grep "fetch> .*\\\0\\\0version=2\\\0$" log &&
+	# Server responded using protocol v2
+	grep "fetch< version 2" log
+'
+
+test_expect_success 'push with git:// and a config of v2 does not request v2' '
+	test_when_finished "rm -f log" &&
+
+	# Till v2 for push is designed, make sure that if a client has
+	# protocol.version configured to use v2, that the client instead falls
+	# back and uses v0.
+
+	test_commit -C daemon_child three &&
+
+	# Push to another branch, as the target repository has the
+	# master branch checked out and we cannot push into it.
+	GIT_TRACE_PACKET="$(pwd)/log" git -C daemon_child -c protocol.version=2 \
+		push origin HEAD:client_branch &&
+
+	git -C daemon_child log -1 --format=%s >actual &&
+	git -C "$daemon_parent" log -1 --format=%s client_branch >expect &&
+	test_cmp expect actual &&
+
+	# Client requested to use protocol v2
+	! grep "push> .*\\\0\\\0version=2\\\0$" log &&
+	# Server responded using protocol v2
+	! grep "push< version 2" log
+'
+
+stop_git_daemon
+
+# Test protocol v2 with 'file://' transport
+#
+test_expect_success 'create repo to be served by file:// transport' '
+	git init file_parent &&
+	test_commit -C file_parent one
+'
+
+test_expect_success 'list refs with file:// using protocol v2' '
+	test_when_finished "rm -f log" &&
+
+	GIT_TRACE_PACKET="$(pwd)/log" git -c protocol.version=2 \
+		ls-remote --symref "file://$(pwd)/file_parent" >actual &&
+
+	# Server responded using protocol v2
+	grep "git< version 2" log &&
+
+	git ls-remote --symref "file://$(pwd)/file_parent" >expect &&
+	test_cmp actual expect
+'
+
+test_expect_success 'ref advertisment is filtered with ls-remote using protocol v2' '
+	test_when_finished "rm -f log" &&
+
+	GIT_TRACE_PACKET="$(pwd)/log" git -c protocol.version=2 \
+		ls-remote "file://$(pwd)/file_parent" master >actual &&
+
+	cat >expect <<-EOF &&
+	$(git -C file_parent rev-parse refs/heads/master)$(printf "\t")refs/heads/master
+	EOF
+
+	test_cmp actual expect
+'
+
+test_expect_success 'clone with file:// using protocol v2' '
+	test_when_finished "rm -f log" &&
+
+	GIT_TRACE_PACKET="$(pwd)/log" git -c protocol.version=2 \
+		clone "file://$(pwd)/file_parent" file_child &&
+
+	git -C file_child log -1 --format=%s >actual &&
+	git -C file_parent log -1 --format=%s >expect &&
+	test_cmp expect actual &&
+
+	# Server responded using protocol v2
+	grep "clone< version 2" log
+'
+
+test_expect_success 'fetch with file:// using protocol v2' '
+	test_when_finished "rm -f log" &&
+
+	test_commit -C file_parent two &&
+
+	GIT_TRACE_PACKET="$(pwd)/log" git -C file_child -c protocol.version=2 \
+		fetch origin &&
+
+	git -C file_child log -1 --format=%s origin/master >actual &&
+	git -C file_parent log -1 --format=%s >expect &&
+	test_cmp expect actual &&
+
+	# Server responded using protocol v2
+	grep "fetch< version 2" log
+'
+
+test_expect_success 'ref advertisment is filtered during fetch using protocol v2' '
+	test_when_finished "rm -f log" &&
+
+	test_commit -C file_parent three &&
+
+	GIT_TRACE_PACKET="$(pwd)/log" git -C file_child -c protocol.version=2 \
+		fetch origin master &&
+
+	git -C file_child log -1 --format=%s origin/master >actual &&
+	git -C file_parent log -1 --format=%s >expect &&
+	test_cmp expect actual &&
+
+	! grep "refs/tags/one" log &&
+	! grep "refs/tags/two" log &&
+	! grep "refs/tags/three" log
+'
+
+# Test protocol v2 with 'http://' transport
+#
+. "$TEST_DIRECTORY"/lib-httpd.sh
+start_httpd
+
+test_expect_success 'create repo to be served by http:// transport' '
+	git init "$HTTPD_DOCUMENT_ROOT_PATH/http_parent" &&
+	git -C "$HTTPD_DOCUMENT_ROOT_PATH/http_parent" config http.receivepack true &&
+	test_commit -C "$HTTPD_DOCUMENT_ROOT_PATH/http_parent" one
+'
+
+test_expect_success 'clone with http:// using protocol v2' '
+	test_when_finished "rm -f log" &&
+
+	GIT_TRACE_PACKET="$(pwd)/log" GIT_TRACE_CURL="$(pwd)/log" git -c protocol.version=2 \
+		clone "$HTTPD_URL/smart/http_parent" http_child &&
+
+	git -C http_child log -1 --format=%s >actual &&
+	git -C "$HTTPD_DOCUMENT_ROOT_PATH/http_parent" log -1 --format=%s >expect &&
+	test_cmp expect actual &&
+
+	# Client requested to use protocol v2
+	grep "Git-Protocol: version=2" log &&
+	# Server responded using protocol v2
+	grep "git< version 2" log
+'
+
+test_expect_success 'fetch with http:// using protocol v2' '
+	test_when_finished "rm -f log" &&
+
+	test_commit -C "$HTTPD_DOCUMENT_ROOT_PATH/http_parent" two &&
+
+	GIT_TRACE_PACKET="$(pwd)/log" git -C http_child -c protocol.version=2 \
+		fetch &&
+
+	git -C http_child log -1 --format=%s origin/master >actual &&
+	git -C "$HTTPD_DOCUMENT_ROOT_PATH/http_parent" log -1 --format=%s >expect &&
+	test_cmp expect actual &&
+
+	# Server responded using protocol v2
+	grep "git< version 2" log
+'
+
+test_expect_success 'push with http:// and a config of v2 does not request v2' '
+	test_when_finished "rm -f log" &&
+	# Till v2 for push is designed, make sure that if a client has
+	# protocol.version configured to use v2, that the client instead falls
+	# back and uses v0.
+
+	test_commit -C http_child three &&
+
+	# Push to another branch, as the target repository has the
+	# master branch checked out and we cannot push into it.
+	GIT_TRACE_PACKET="$(pwd)/log" git -C http_child -c protocol.version=2 \
+		push origin HEAD:client_branch &&
+
+	git -C http_child log -1 --format=%s >actual &&
+	git -C "$HTTPD_DOCUMENT_ROOT_PATH/http_parent" log -1 --format=%s client_branch >expect &&
+	test_cmp expect actual &&
+
+	# Client didnt request to use protocol v2
+	! grep "Git-Protocol: version=2" log &&
+	# Server didnt respond using protocol v2
+	! grep "git< version 2" log
+'
+
+
+stop_httpd
+
+test_done