diff: restrict when prefetching occurs

[thirdparty/git.git] / t / t4067-diff-partial-clone.sh

diff --git a/t/t4067-diff-partial-clone.sh b/t/t4067-diff-partial-clone.sh
index 4831ad35e61436fdc400533fb0e7f88e6d27027c..c1ed1c2fc4a7f36178220f2c9ead05bfb826ee33 100755 (executable)
--- a/t/t4067-diff-partial-clone.sh
+++ b/t/t4067-diff-partial-clone.sh
@@ -131,4 +131,52 @@ test_expect_success 'diff with rename detection batches blobs' '
        test_line_count = 1 done_lines
 '
 
+test_expect_success 'diff does not fetch anything if inexact rename detection is not needed' '
+       test_when_finished "rm -rf server client trace" &&
+
+       test_create_repo server &&
+       echo a >server/a &&
+       printf "b\nb\nb\nb\nb\n" >server/b &&
+       git -C server add a b &&
+       git -C server commit -m x &&
+       mv server/b server/c &&
+       git -C server add c &&
+       git -C server commit -a -m x &&
+
+       test_config -C server uploadpack.allowfilter 1 &&
+       test_config -C server uploadpack.allowanysha1inwant 1 &&
+       git clone --bare --filter=blob:limit=0 "file://$(pwd)/server" client &&
+
+       # Ensure no fetches.
+       GIT_TRACE_PACKET="$(pwd)/trace" git -C client diff --raw -M HEAD^ HEAD &&
+       ! test_path_exists trace
+'
+
+test_expect_success 'diff --break-rewrites fetches only if necessary, and batches blobs if it does' '
+       test_when_finished "rm -rf server client trace" &&
+
+       test_create_repo server &&
+       echo a >server/a &&
+       printf "b\nb\nb\nb\nb\n" >server/b &&
+       git -C server add a b &&
+       git -C server commit -m x &&
+       printf "c\nc\nc\nc\nc\n" >server/b &&
+       git -C server commit -a -m x &&
+
+       test_config -C server uploadpack.allowfilter 1 &&
+       test_config -C server uploadpack.allowanysha1inwant 1 &&
+       git clone --bare --filter=blob:limit=0 "file://$(pwd)/server" client &&
+
+       # Ensure no fetches.
+       GIT_TRACE_PACKET="$(pwd)/trace" git -C client diff --raw -M HEAD^ HEAD &&
+       ! test_path_exists trace &&
+
+       # But with --break-rewrites, 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 --break-rewrites --raw -M HEAD^ HEAD &&
+       grep "git> done" trace >done_lines &&
+       test_line_count = 1 done_lines
+'
+
 test_done