1 files changed, 134 insertions, 0 deletions
diff --git a/t/t5334-incremental-multi-pack-index.sh b/t/t5334-incremental-multi-pack-index.sh
new file mode 100755
index 0000000000..d30d7253d6
--- /dev/null
+++ b/t/t5334-incremental-multi-pack-index.sh
@@ -0,0 +1,134 @@
+#!/bin/sh
+
+test_description='incremental multi-pack-index'
+
+. ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-midx.sh
+
+GIT_TEST_MULTI_PACK_INDEX=0
+export GIT_TEST_MULTI_PACK_INDEX
+
+objdir=.git/objects
+packdir=$objdir/pack
+midxdir=$packdir/multi-pack-index.d
+midx_chain=$midxdir/multi-pack-index-chain
+
+test_expect_success 'convert non-incremental MIDX to incremental' '
+	test_commit base &&
+	git repack -ad &&
+	git multi-pack-index write &&
+
+	test_path_is_file $packdir/multi-pack-index &&
+	old_hash="$(midx_checksum $objdir)" &&
+
+	test_commit other &&
+	git repack -d &&
+	git multi-pack-index write --incremental &&
+
+	test_path_is_missing $packdir/multi-pack-index &&
+	test_path_is_file $midx_chain &&
+	test_line_count = 2 $midx_chain &&
+	grep $old_hash $midx_chain
+'
+
+compare_results_with_midx 'incremental MIDX'
+
+test_expect_success 'convert incremental to non-incremental' '
+	test_commit squash &&
+	git repack -d &&
+	git multi-pack-index write &&
+
+	test_path_is_file $packdir/multi-pack-index &&
+	test_dir_is_empty $midxdir
+'
+
+compare_results_with_midx 'non-incremental MIDX conversion'
+
+write_midx_layer () {
+	n=1
+	if test -f $midx_chain
+	then
+		n="$(($(wc -l <$midx_chain) + 1))"
+	fi
+
+	for i in 1 2
+	do
+		test_commit $n.$i &&
+		git repack -d || return 1
+	done &&
+	git multi-pack-index write --bitmap --incremental
+}
+
+test_expect_success 'write initial MIDX layer' '
+	git repack -ad &&
+	write_midx_layer
+'
+
+test_expect_success 'read bitmap from first MIDX layer' '
+	git rev-list --test-bitmap 1.2
+'
+
+test_expect_success 'write another MIDX layer' '
+	write_midx_layer
+'
+
+test_expect_success 'midx verify with multiple layers' '
+	test_path_is_file "$midx_chain" &&
+	test_line_count = 2 "$midx_chain" &&
+
+	git multi-pack-index verify
+'
+
+test_expect_success 'read bitmap from second MIDX layer' '
+	git rev-list --test-bitmap 2.2
+'
+
+test_expect_success 'read earlier bitmap from second MIDX layer' '
+	git rev-list --test-bitmap 1.2
+'
+
+test_expect_success 'show object from first pack' '
+	git cat-file -p 1.1
+'
+
+test_expect_success 'show object from second pack' '
+	git cat-file -p 2.2
+'
+
+for reuse in false single multi
+do
+	test_expect_success "full clone (pack.allowPackReuse=$reuse)" '
+		rm -fr clone.git &&
+
+		git config pack.allowPackReuse $reuse &&
+		git clone --no-local --bare . clone.git
+	'
+done
+
+test_expect_success 'relink existing MIDX layer' '
+	rm -fr "$midxdir" &&
+
+	GIT_TEST_MIDX_WRITE_REV=1 git multi-pack-index write --bitmap &&
+
+	midx_hash="$(test-tool read-midx --checksum $objdir)" &&
+
+	test_path_is_file "$packdir/multi-pack-index" &&
+	test_path_is_file "$packdir/multi-pack-index-$midx_hash.bitmap" &&
+	test_path_is_file "$packdir/multi-pack-index-$midx_hash.rev" &&
+
+	test_commit another &&
+	git repack -d &&
+	git multi-pack-index write --bitmap --incremental &&
+
+	test_path_is_missing "$packdir/multi-pack-index" &&
+	test_path_is_missing "$packdir/multi-pack-index-$midx_hash.bitmap" &&
+	test_path_is_missing "$packdir/multi-pack-index-$midx_hash.rev" &&
+
+	test_path_is_file "$midxdir/multi-pack-index-$midx_hash.midx" &&
+	test_path_is_file "$midxdir/multi-pack-index-$midx_hash.bitmap" &&
+	test_path_is_file "$midxdir/multi-pack-index-$midx_hash.rev" &&
+	test_line_count = 2 "$midx_chain"
+
+'
+
+test_done