Adding upstream version 1:2.39.2.upstream/1%2.39.2upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 842 insertions, 0 deletions

diff --git a/t/t5318-commit-graph.sh b/t/t5318-commit-graph.sh
new file mode 100755
index 0000000..049c5fc
--- /dev/null
+++ b/t/t5318-commit-graph.sh
@@ -0,0 +1,842 @@
+#!/bin/sh
+
+test_description='commit graph'
+. ./test-lib.sh
+
+GIT_TEST_COMMIT_GRAPH_CHANGED_PATHS=0
+
+test_expect_success 'usage' '
+	test_expect_code 129 git commit-graph write blah 2>err &&
+	test_expect_code 129 git commit-graph write verify
+'
+
+test_expect_success 'usage shown without sub-command' '
+	test_expect_code 129 git commit-graph 2>err &&
+	grep usage: err
+'
+
+test_expect_success 'usage shown with an error on unknown sub-command' '
+	cat >expect <<-\EOF &&
+	error: unknown subcommand: `unknown'\''
+	EOF
+	test_expect_code 129 git commit-graph unknown 2>stderr &&
+	grep error stderr >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'setup full repo' '
+	mkdir full &&
+	cd "$TRASH_DIRECTORY/full" &&
+	git init &&
+	git config core.commitGraph true &&
+	objdir=".git/objects"
+'
+
+test_expect_success POSIXPERM 'tweak umask for modebit tests' '
+	umask 022
+'
+
+test_expect_success 'verify graph with no graph file' '
+	cd "$TRASH_DIRECTORY/full" &&
+	git commit-graph verify
+'
+
+test_expect_success 'write graph with no packs' '
+	cd "$TRASH_DIRECTORY/full" &&
+	git commit-graph write --object-dir $objdir &&
+	test_path_is_missing $objdir/info/commit-graph
+'
+
+test_expect_success 'exit with correct error on bad input to --stdin-packs' '
+	cd "$TRASH_DIRECTORY/full" &&
+	echo doesnotexist >in &&
+	test_expect_code 1 git commit-graph write --stdin-packs <in 2>stderr &&
+	test_i18ngrep "error adding pack" stderr
+'
+
+test_expect_success 'create commits and repack' '
+	cd "$TRASH_DIRECTORY/full" &&
+	for i in $(test_seq 3)
+	do
+		test_commit $i &&
+		git branch commits/$i || return 1
+	done &&
+	git repack
+'
+
+. "$TEST_DIRECTORY"/lib-commit-graph.sh
+
+graph_git_behavior 'no graph' full commits/3 commits/1
+
+test_expect_success 'exit with correct error on bad input to --stdin-commits' '
+	cd "$TRASH_DIRECTORY/full" &&
+	# invalid, non-hex OID
+	echo HEAD >in &&
+	test_expect_code 1 git commit-graph write --stdin-commits <in 2>stderr &&
+	test_i18ngrep "unexpected non-hex object ID: HEAD" stderr &&
+	# non-existent OID
+	echo $ZERO_OID >in &&
+	test_expect_code 1 git commit-graph write --stdin-commits <in 2>stderr &&
+	test_i18ngrep "invalid object" stderr &&
+	# valid commit and tree OID
+	git rev-parse HEAD HEAD^{tree} >in &&
+	git commit-graph write --stdin-commits <in &&
+	graph_read_expect 3 generation_data
+'
+
+test_expect_success 'write graph' '
+	cd "$TRASH_DIRECTORY/full" &&
+	git commit-graph write &&
+	test_path_is_file $objdir/info/commit-graph &&
+	graph_read_expect "3" generation_data
+'
+
+test_expect_success POSIXPERM 'write graph has correct permissions' '
+	test_path_is_file $objdir/info/commit-graph &&
+	echo "-r--r--r--" >expect &&
+	test_modebits $objdir/info/commit-graph >actual &&
+	test_cmp expect actual
+'
+
+graph_git_behavior 'graph exists' full commits/3 commits/1
+
+test_expect_success 'Add more commits' '
+	cd "$TRASH_DIRECTORY/full" &&
+	git reset --hard commits/1 &&
+	for i in $(test_seq 4 5)
+	do
+		test_commit $i &&
+		git branch commits/$i || return 1
+	done &&
+	git reset --hard commits/2 &&
+	for i in $(test_seq 6 7)
+	do
+		test_commit $i &&
+		git branch commits/$i || return 1
+	done &&
+	git reset --hard commits/2 &&
+	git merge commits/4 &&
+	git branch merge/1 &&
+	git reset --hard commits/4 &&
+	git merge commits/6 &&
+	git branch merge/2 &&
+	git reset --hard commits/3 &&
+	git merge commits/5 commits/7 &&
+	git branch merge/3 &&
+	git repack
+'
+
+test_expect_success 'commit-graph write progress off for redirected stderr' '
+	cd "$TRASH_DIRECTORY/full" &&
+	git commit-graph write 2>err &&
+	test_must_be_empty err
+'
+
+test_expect_success 'commit-graph write force progress on for stderr' '
+	cd "$TRASH_DIRECTORY/full" &&
+	GIT_PROGRESS_DELAY=0 git commit-graph write --progress 2>err &&
+	test_file_not_empty err
+'
+
+test_expect_success 'commit-graph write with the --no-progress option' '
+	cd "$TRASH_DIRECTORY/full" &&
+	git commit-graph write --no-progress 2>err &&
+	test_must_be_empty err
+'
+
+test_expect_success 'commit-graph write --stdin-commits progress off for redirected stderr' '
+	cd "$TRASH_DIRECTORY/full" &&
+	git rev-parse commits/5 >in &&
+	git commit-graph write --stdin-commits <in 2>err &&
+	test_must_be_empty err
+'
+
+test_expect_success 'commit-graph write --stdin-commits force progress on for stderr' '
+	cd "$TRASH_DIRECTORY/full" &&
+	git rev-parse commits/5 >in &&
+	GIT_PROGRESS_DELAY=0 git commit-graph write --stdin-commits --progress <in 2>err &&
+	test_i18ngrep "Collecting commits from input" err
+'
+
+test_expect_success 'commit-graph write --stdin-commits with the --no-progress option' '
+	cd "$TRASH_DIRECTORY/full" &&
+	git rev-parse commits/5 >in &&
+	git commit-graph write --stdin-commits --no-progress <in 2>err &&
+	test_must_be_empty err
+'
+
+test_expect_success 'commit-graph verify progress off for redirected stderr' '
+	cd "$TRASH_DIRECTORY/full" &&
+	git commit-graph verify 2>err &&
+	test_must_be_empty err
+'
+
+test_expect_success 'commit-graph verify force progress on for stderr' '
+	cd "$TRASH_DIRECTORY/full" &&
+	GIT_PROGRESS_DELAY=0 git commit-graph verify --progress 2>err &&
+	test_file_not_empty err
+'
+
+test_expect_success 'commit-graph verify with the --no-progress option' '
+	cd "$TRASH_DIRECTORY/full" &&
+	git commit-graph verify --no-progress 2>err &&
+	test_must_be_empty err
+'
+
+# Current graph structure:
+#
+#   __M3___
+#  /   |   \
+# 3 M1 5 M2 7
+# |/  \|/  \|
+# 2    4    6
+# |___/____/
+# 1
+
+test_expect_success 'write graph with merges' '
+	cd "$TRASH_DIRECTORY/full" &&
+	git commit-graph write &&
+	test_path_is_file $objdir/info/commit-graph &&
+	graph_read_expect "10" "generation_data extra_edges"
+'
+
+graph_git_behavior 'merge 1 vs 2' full merge/1 merge/2
+graph_git_behavior 'merge 1 vs 3' full merge/1 merge/3
+graph_git_behavior 'merge 2 vs 3' full merge/2 merge/3
+
+test_expect_success 'Add one more commit' '
+	cd "$TRASH_DIRECTORY/full" &&
+	test_commit 8 &&
+	git branch commits/8 &&
+	ls $objdir/pack | grep idx >existing-idx &&
+	git repack &&
+	ls $objdir/pack| grep idx | grep -v -f existing-idx >new-idx
+'
+
+# Current graph structure:
+#
+#      8
+#      |
+#   __M3___
+#  /   |   \
+# 3 M1 5 M2 7
+# |/  \|/  \|
+# 2    4    6
+# |___/____/
+# 1
+
+graph_git_behavior 'mixed mode, commit 8 vs merge 1' full commits/8 merge/1
+graph_git_behavior 'mixed mode, commit 8 vs merge 2' full commits/8 merge/2
+
+test_expect_success 'write graph with new commit' '
+	cd "$TRASH_DIRECTORY/full" &&
+	git commit-graph write &&
+	test_path_is_file $objdir/info/commit-graph &&
+	graph_read_expect "11" "generation_data extra_edges"
+'
+
+graph_git_behavior 'full graph, commit 8 vs merge 1' full commits/8 merge/1
+graph_git_behavior 'full graph, commit 8 vs merge 2' full commits/8 merge/2
+
+test_expect_success 'write graph with nothing new' '
+	cd "$TRASH_DIRECTORY/full" &&
+	git commit-graph write &&
+	test_path_is_file $objdir/info/commit-graph &&
+	graph_read_expect "11" "generation_data extra_edges"
+'
+
+graph_git_behavior 'cleared graph, commit 8 vs merge 1' full commits/8 merge/1
+graph_git_behavior 'cleared graph, commit 8 vs merge 2' full commits/8 merge/2
+
+test_expect_success 'build graph from latest pack with closure' '
+	cd "$TRASH_DIRECTORY/full" &&
+	cat new-idx | git commit-graph write --stdin-packs &&
+	test_path_is_file $objdir/info/commit-graph &&
+	graph_read_expect "9" "generation_data extra_edges"
+'
+
+graph_git_behavior 'graph from pack, commit 8 vs merge 1' full commits/8 merge/1
+graph_git_behavior 'graph from pack, commit 8 vs merge 2' full commits/8 merge/2
+
+test_expect_success 'build graph from commits with closure' '
+	cd "$TRASH_DIRECTORY/full" &&
+	git tag -a -m "merge" tag/merge merge/2 &&
+	git rev-parse tag/merge >commits-in &&
+	git rev-parse merge/1 >>commits-in &&
+	cat commits-in | git commit-graph write --stdin-commits &&
+	test_path_is_file $objdir/info/commit-graph &&
+	graph_read_expect "6" "generation_data"
+'
+
+graph_git_behavior 'graph from commits, commit 8 vs merge 1' full commits/8 merge/1
+graph_git_behavior 'graph from commits, commit 8 vs merge 2' full commits/8 merge/2
+
+test_expect_success 'build graph from commits with append' '
+	cd "$TRASH_DIRECTORY/full" &&
+	git rev-parse merge/3 | git commit-graph write --stdin-commits --append &&
+	test_path_is_file $objdir/info/commit-graph &&
+	graph_read_expect "10" "generation_data extra_edges"
+'
+
+graph_git_behavior 'append graph, commit 8 vs merge 1' full commits/8 merge/1
+graph_git_behavior 'append graph, commit 8 vs merge 2' full commits/8 merge/2
+
+test_expect_success 'build graph using --reachable' '
+	cd "$TRASH_DIRECTORY/full" &&
+	git commit-graph write --reachable &&
+	test_path_is_file $objdir/info/commit-graph &&
+	graph_read_expect "11" "generation_data extra_edges"
+'
+
+graph_git_behavior 'append graph, commit 8 vs merge 1' full commits/8 merge/1
+graph_git_behavior 'append graph, commit 8 vs merge 2' full commits/8 merge/2
+
+test_expect_success 'setup bare repo' '
+	cd "$TRASH_DIRECTORY" &&
+	git clone --bare --no-local full bare &&
+	cd bare &&
+	git config core.commitGraph true &&
+	baredir="./objects"
+'
+
+graph_git_behavior 'bare repo, commit 8 vs merge 1' bare commits/8 merge/1
+graph_git_behavior 'bare repo, commit 8 vs merge 2' bare commits/8 merge/2
+
+test_expect_success 'write graph in bare repo' '
+	cd "$TRASH_DIRECTORY/bare" &&
+	git commit-graph write &&
+	test_path_is_file $baredir/info/commit-graph &&
+	graph_read_expect "11" "generation_data extra_edges"
+'
+
+graph_git_behavior 'bare repo with graph, commit 8 vs merge 1' bare commits/8 merge/1
+graph_git_behavior 'bare repo with graph, commit 8 vs merge 2' bare commits/8 merge/2
+
+test_expect_success 'perform fast-forward merge in full repo' '
+	cd "$TRASH_DIRECTORY/full" &&
+	git checkout -b merge-5-to-8 commits/5 &&
+	git merge commits/8 &&
+	git show-ref -s merge-5-to-8 >output &&
+	git show-ref -s commits/8 >expect &&
+	test_cmp expect output
+'
+
+test_expect_success 'check that gc computes commit-graph' '
+	cd "$TRASH_DIRECTORY/full" &&
+	git commit --allow-empty -m "blank" &&
+	git commit-graph write --reachable &&
+	cp $objdir/info/commit-graph commit-graph-before-gc &&
+	git reset --hard HEAD~1 &&
+	git config gc.writeCommitGraph true &&
+	git gc &&
+	cp $objdir/info/commit-graph commit-graph-after-gc &&
+	! test_cmp_bin commit-graph-before-gc commit-graph-after-gc &&
+	git commit-graph write --reachable &&
+	test_cmp_bin commit-graph-after-gc $objdir/info/commit-graph
+'
+
+test_expect_success 'replace-objects invalidates commit-graph' '
+	cd "$TRASH_DIRECTORY" &&
+	test_when_finished rm -rf replace &&
+	git clone full replace &&
+	(
+		cd replace &&
+		git commit-graph write --reachable &&
+		test_path_is_file .git/objects/info/commit-graph &&
+		git replace HEAD~1 HEAD~2 &&
+		graph_git_two_modes "commit-graph verify" &&
+		git -c core.commitGraph=false log >expect &&
+		git -c core.commitGraph=true log >actual &&
+		test_cmp expect actual &&
+		git commit-graph write --reachable &&
+		git -c core.commitGraph=false --no-replace-objects log >expect &&
+		git -c core.commitGraph=true --no-replace-objects log >actual &&
+		test_cmp expect actual &&
+		rm -rf .git/objects/info/commit-graph &&
+		git commit-graph write --reachable &&
+		test_path_is_file .git/objects/info/commit-graph
+	)
+'
+
+test_expect_success 'commit grafts invalidate commit-graph' '
+	cd "$TRASH_DIRECTORY" &&
+	test_when_finished rm -rf graft &&
+	git clone --template= full graft &&
+	(
+		cd graft &&
+		git commit-graph write --reachable &&
+		test_path_is_file .git/objects/info/commit-graph &&
+		H1=$(git rev-parse --verify HEAD~1) &&
+		H3=$(git rev-parse --verify HEAD~3) &&
+		mkdir .git/info &&
+		echo "$H1 $H3" >.git/info/grafts &&
+		git -c core.commitGraph=false log >expect &&
+		git -c core.commitGraph=true log >actual &&
+		test_cmp expect actual &&
+		git commit-graph write --reachable &&
+		git -c core.commitGraph=false --no-replace-objects log >expect &&
+		git -c core.commitGraph=true --no-replace-objects log >actual &&
+		test_cmp expect actual &&
+		rm -rf .git/objects/info/commit-graph &&
+		git commit-graph write --reachable &&
+		test_path_is_missing .git/objects/info/commit-graph
+	)
+'
+
+test_expect_success 'replace-objects invalidates commit-graph' '
+	cd "$TRASH_DIRECTORY" &&
+	test_when_finished rm -rf shallow &&
+	git clone --depth 2 "file://$TRASH_DIRECTORY/full" shallow &&
+	(
+		cd shallow &&
+		git commit-graph write --reachable &&
+		test_path_is_missing .git/objects/info/commit-graph &&
+		git fetch origin --unshallow &&
+		git commit-graph write --reachable &&
+		test_path_is_file .git/objects/info/commit-graph
+	)
+'
+
+test_expect_success 'warn on improper hash version' '
+	git init --object-format=sha1 sha1 &&
+	(
+		cd sha1 &&
+		test_commit 1 &&
+		git commit-graph write --reachable &&
+		mv .git/objects/info/commit-graph ../cg-sha1
+	) &&
+	git init --object-format=sha256 sha256 &&
+	(
+		cd sha256 &&
+		test_commit 1 &&
+		git commit-graph write --reachable &&
+		mv .git/objects/info/commit-graph ../cg-sha256
+	) &&
+	(
+		cd sha1 &&
+		mv ../cg-sha256 .git/objects/info/commit-graph &&
+		git log -1 2>err &&
+		test_i18ngrep "commit-graph hash version 2 does not match version 1" err
+	) &&
+	(
+		cd sha256 &&
+		mv ../cg-sha1 .git/objects/info/commit-graph &&
+		git log -1 2>err &&
+		test_i18ngrep "commit-graph hash version 1 does not match version 2" err
+	)
+'
+
+test_expect_success TIME_IS_64BIT,TIME_T_IS_64BIT 'lower layers have overflow chunk' '
+	cd "$TRASH_DIRECTORY/full" &&
+	UNIX_EPOCH_ZERO="@0 +0000" &&
+	FUTURE_DATE="@4147483646 +0000" &&
+	rm -f .git/objects/info/commit-graph &&
+	test_commit --date "$FUTURE_DATE" future-1 &&
+	test_commit --date "$UNIX_EPOCH_ZERO" old-1 &&
+	git commit-graph write --reachable &&
+	test_commit --date "$FUTURE_DATE" future-2 &&
+	test_commit --date "$UNIX_EPOCH_ZERO" old-2 &&
+	git commit-graph write --reachable --split=no-merge &&
+	test_commit extra &&
+	git commit-graph write --reachable --split=no-merge &&
+	git commit-graph write --reachable &&
+	graph_read_expect 16 "generation_data generation_data_overflow extra_edges" &&
+	mv .git/objects/info/commit-graph commit-graph-upgraded &&
+	git commit-graph write --reachable &&
+	graph_read_expect 16 "generation_data generation_data_overflow extra_edges" &&
+	test_cmp .git/objects/info/commit-graph commit-graph-upgraded
+'
+
+# the verify tests below expect the commit-graph to contain
+# exactly the commits reachable from the commits/8 branch.
+# If the file changes the set of commits in the list, then the
+# offsets into the binary file will result in different edits
+# and the tests will likely break.
+
+test_expect_success 'git commit-graph verify' '
+	cd "$TRASH_DIRECTORY/full" &&
+	git rev-parse commits/8 | git -c commitGraph.generationVersion=1 commit-graph write --stdin-commits &&
+	git commit-graph verify >output &&
+	graph_read_expect 9 extra_edges 1
+'
+
+NUM_COMMITS=9
+NUM_OCTOPUS_EDGES=2
+HASH_LEN="$(test_oid rawsz)"
+GRAPH_BYTE_VERSION=4
+GRAPH_BYTE_HASH=5
+GRAPH_BYTE_CHUNK_COUNT=6
+GRAPH_CHUNK_LOOKUP_OFFSET=8
+GRAPH_CHUNK_LOOKUP_WIDTH=12
+GRAPH_CHUNK_LOOKUP_ROWS=5
+GRAPH_BYTE_OID_FANOUT_ID=$GRAPH_CHUNK_LOOKUP_OFFSET
+GRAPH_BYTE_OID_LOOKUP_ID=$(($GRAPH_CHUNK_LOOKUP_OFFSET + \
+			    1 * $GRAPH_CHUNK_LOOKUP_WIDTH))
+GRAPH_BYTE_COMMIT_DATA_ID=$(($GRAPH_CHUNK_LOOKUP_OFFSET + \
+			     2 * $GRAPH_CHUNK_LOOKUP_WIDTH))
+GRAPH_FANOUT_OFFSET=$(($GRAPH_CHUNK_LOOKUP_OFFSET + \
+		       $GRAPH_CHUNK_LOOKUP_WIDTH * $GRAPH_CHUNK_LOOKUP_ROWS))
+GRAPH_BYTE_FANOUT1=$(($GRAPH_FANOUT_OFFSET + 4 * 4))
+GRAPH_BYTE_FANOUT2=$(($GRAPH_FANOUT_OFFSET + 4 * 255))
+GRAPH_OID_LOOKUP_OFFSET=$(($GRAPH_FANOUT_OFFSET + 4 * 256))
+GRAPH_BYTE_OID_LOOKUP_ORDER=$(($GRAPH_OID_LOOKUP_OFFSET + $HASH_LEN * 8))
+GRAPH_BYTE_OID_LOOKUP_MISSING=$(($GRAPH_OID_LOOKUP_OFFSET + $HASH_LEN * 4 + 10))
+GRAPH_COMMIT_DATA_OFFSET=$(($GRAPH_OID_LOOKUP_OFFSET + $HASH_LEN * $NUM_COMMITS))
+GRAPH_BYTE_COMMIT_TREE=$GRAPH_COMMIT_DATA_OFFSET
+GRAPH_BYTE_COMMIT_PARENT=$(($GRAPH_COMMIT_DATA_OFFSET + $HASH_LEN))
+GRAPH_BYTE_COMMIT_EXTRA_PARENT=$(($GRAPH_COMMIT_DATA_OFFSET + $HASH_LEN + 4))
+GRAPH_BYTE_COMMIT_WRONG_PARENT=$(($GRAPH_COMMIT_DATA_OFFSET + $HASH_LEN + 3))
+GRAPH_BYTE_COMMIT_GENERATION=$(($GRAPH_COMMIT_DATA_OFFSET + $HASH_LEN + 11))
+GRAPH_BYTE_COMMIT_DATE=$(($GRAPH_COMMIT_DATA_OFFSET + $HASH_LEN + 12))
+GRAPH_COMMIT_DATA_WIDTH=$(($HASH_LEN + 16))
+GRAPH_OCTOPUS_DATA_OFFSET=$(($GRAPH_COMMIT_DATA_OFFSET + \
+			     $GRAPH_COMMIT_DATA_WIDTH * $NUM_COMMITS))
+GRAPH_BYTE_OCTOPUS=$(($GRAPH_OCTOPUS_DATA_OFFSET + 4))
+GRAPH_BYTE_FOOTER=$(($GRAPH_OCTOPUS_DATA_OFFSET + 4 * $NUM_OCTOPUS_EDGES))
+
+corrupt_graph_setup() {
+	cd "$TRASH_DIRECTORY/full" &&
+	test_when_finished mv commit-graph-backup $objdir/info/commit-graph &&
+	cp $objdir/info/commit-graph commit-graph-backup &&
+	chmod u+w $objdir/info/commit-graph
+}
+
+corrupt_graph_verify() {
+	grepstr=$1
+	test_must_fail git commit-graph verify 2>test_err &&
+	grep -v "^+" test_err >err &&
+	test_i18ngrep "$grepstr" err &&
+	if test "$2" != "no-copy"
+	then
+		cp $objdir/info/commit-graph commit-graph-pre-write-test
+	fi &&
+	git status --short &&
+	GIT_TEST_COMMIT_GRAPH_DIE_ON_PARSE=true git commit-graph write &&
+	chmod u+w $objdir/info/commit-graph &&
+	git commit-graph verify
+}
+
+# usage: corrupt_graph_and_verify <position> <data> <string> [<zero_pos>]
+# Manipulates the commit-graph file at the position
+# by inserting the data, optionally zeroing the file
+# starting at <zero_pos>, then runs 'git commit-graph verify'
+# and places the output in the file 'err'. Test 'err' for
+# the given string.
+corrupt_graph_and_verify() {
+	pos=$1
+	data="${2:-\0}"
+	grepstr=$3
+	corrupt_graph_setup &&
+	orig_size=$(wc -c < $objdir/info/commit-graph) &&
+	zero_pos=${4:-${orig_size}} &&
+	printf "$data" | dd of="$objdir/info/commit-graph" bs=1 seek="$pos" conv=notrunc &&
+	dd of="$objdir/info/commit-graph" bs=1 seek="$zero_pos" if=/dev/null &&
+	test-tool genzeros $(($orig_size - $zero_pos)) >>"$objdir/info/commit-graph" &&
+	corrupt_graph_verify "$grepstr"
+
+}
+
+test_expect_success POSIXPERM,SANITY 'detect permission problem' '
+	corrupt_graph_setup &&
+	chmod 000 $objdir/info/commit-graph &&
+	corrupt_graph_verify "Could not open" "no-copy"
+'
+
+test_expect_success 'detect too small' '
+	corrupt_graph_setup &&
+	echo "a small graph" >$objdir/info/commit-graph &&
+	corrupt_graph_verify "too small"
+'
+
+test_expect_success 'detect bad signature' '
+	corrupt_graph_and_verify 0 "\0" \
+		"graph signature"
+'
+
+test_expect_success 'detect bad version' '
+	corrupt_graph_and_verify $GRAPH_BYTE_VERSION "\02" \
+		"graph version"
+'
+
+test_expect_success 'detect bad hash version' '
+	corrupt_graph_and_verify $GRAPH_BYTE_HASH "\03" \
+		"hash version"
+'
+
+test_expect_success 'detect low chunk count' '
+	corrupt_graph_and_verify $GRAPH_BYTE_CHUNK_COUNT "\01" \
+		"final chunk has non-zero id"
+'
+
+test_expect_success 'detect missing OID fanout chunk' '
+	corrupt_graph_and_verify $GRAPH_BYTE_OID_FANOUT_ID "\0" \
+		"missing the OID Fanout chunk"
+'
+
+test_expect_success 'detect missing OID lookup chunk' '
+	corrupt_graph_and_verify $GRAPH_BYTE_OID_LOOKUP_ID "\0" \
+		"missing the OID Lookup chunk"
+'
+
+test_expect_success 'detect missing commit data chunk' '
+	corrupt_graph_and_verify $GRAPH_BYTE_COMMIT_DATA_ID "\0" \
+		"missing the Commit Data chunk"
+'
+
+test_expect_success 'detect incorrect fanout' '
+	corrupt_graph_and_verify $GRAPH_BYTE_FANOUT1 "\01" \
+		"fanout value"
+'
+
+test_expect_success 'detect incorrect fanout final value' '
+	corrupt_graph_and_verify $GRAPH_BYTE_FANOUT2 "\01" \
+		"fanout value"
+'
+
+test_expect_success 'detect incorrect OID order' '
+	corrupt_graph_and_verify $GRAPH_BYTE_OID_LOOKUP_ORDER "\01" \
+		"incorrect OID order"
+'
+
+test_expect_success 'detect OID not in object database' '
+	corrupt_graph_and_verify $GRAPH_BYTE_OID_LOOKUP_MISSING "\01" \
+		"from object database"
+'
+
+test_expect_success 'detect incorrect tree OID' '
+	corrupt_graph_and_verify $GRAPH_BYTE_COMMIT_TREE "\01" \
+		"root tree OID for commit"
+'
+
+test_expect_success 'detect incorrect parent int-id' '
+	corrupt_graph_and_verify $GRAPH_BYTE_COMMIT_PARENT "\01" \
+		"invalid parent"
+'
+
+test_expect_success 'detect extra parent int-id' '
+	corrupt_graph_and_verify $GRAPH_BYTE_COMMIT_EXTRA_PARENT "\00" \
+		"is too long"
+'
+
+test_expect_success 'detect wrong parent' '
+	corrupt_graph_and_verify $GRAPH_BYTE_COMMIT_WRONG_PARENT "\01" \
+		"commit-graph parent for"
+'
+
+test_expect_success 'detect incorrect generation number' '
+	corrupt_graph_and_verify $GRAPH_BYTE_COMMIT_GENERATION "\070" \
+		"generation for commit"
+'
+
+test_expect_success 'detect incorrect generation number' '
+	corrupt_graph_and_verify $GRAPH_BYTE_COMMIT_GENERATION "\01" \
+		"non-zero generation number"
+'
+
+test_expect_success 'detect incorrect commit date' '
+	corrupt_graph_and_verify $GRAPH_BYTE_COMMIT_DATE "\01" \
+		"commit date"
+'
+
+test_expect_success 'detect incorrect parent for octopus merge' '
+	corrupt_graph_and_verify $GRAPH_BYTE_OCTOPUS "\01" \
+		"invalid parent"
+'
+
+test_expect_success 'detect invalid checksum hash' '
+	corrupt_graph_and_verify $GRAPH_BYTE_FOOTER "\00" \
+		"incorrect checksum"
+'
+
+test_expect_success 'detect incorrect chunk count' '
+	corrupt_graph_and_verify $GRAPH_BYTE_CHUNK_COUNT "\377" \
+		"commit-graph file is too small to hold [0-9]* chunks" \
+		$GRAPH_CHUNK_LOOKUP_OFFSET
+'
+
+test_expect_success 'git fsck (checks commit-graph when config set to true)' '
+	cd "$TRASH_DIRECTORY/full" &&
+	git fsck &&
+	corrupt_graph_and_verify $GRAPH_BYTE_FOOTER "\00" \
+		"incorrect checksum" &&
+	cp commit-graph-pre-write-test $objdir/info/commit-graph &&
+	test_must_fail git -c core.commitGraph=true fsck
+'
+
+test_expect_success 'git fsck (ignores commit-graph when config set to false)' '
+	cd "$TRASH_DIRECTORY/full" &&
+	git fsck &&
+	corrupt_graph_and_verify $GRAPH_BYTE_FOOTER "\00" \
+		"incorrect checksum" &&
+	cp commit-graph-pre-write-test $objdir/info/commit-graph &&
+	git -c core.commitGraph=false fsck
+'
+
+test_expect_success 'git fsck (checks commit-graph when config unset)' '
+	cd "$TRASH_DIRECTORY/full" &&
+	test_when_finished "git config core.commitGraph true" &&
+
+	git fsck &&
+	corrupt_graph_and_verify $GRAPH_BYTE_FOOTER "\00" \
+		"incorrect checksum" &&
+	test_unconfig core.commitGraph &&
+	cp commit-graph-pre-write-test $objdir/info/commit-graph &&
+	test_must_fail git fsck
+'
+
+test_expect_success 'setup non-the_repository tests' '
+	rm -rf repo &&
+	git init repo &&
+	test_commit -C repo one &&
+	test_commit -C repo two &&
+	git -C repo config core.commitGraph true &&
+	git -C repo rev-parse two | \
+		git -C repo commit-graph write --stdin-commits
+'
+
+test_expect_success 'parse_commit_in_graph works for non-the_repository' '
+	test-tool repository parse_commit_in_graph \
+		repo/.git repo "$(git -C repo rev-parse two)" >actual &&
+	{
+		git -C repo log --pretty=format:"%ct " -1 &&
+		git -C repo rev-parse one
+	} >expect &&
+	test_cmp expect actual &&
+
+	test-tool repository parse_commit_in_graph \
+		repo/.git repo "$(git -C repo rev-parse one)" >actual &&
+	git -C repo log --pretty="%ct" -1 one >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'get_commit_tree_in_graph works for non-the_repository' '
+	test-tool repository get_commit_tree_in_graph \
+		repo/.git repo "$(git -C repo rev-parse two)" >actual &&
+	git -C repo rev-parse two^{tree} >expect &&
+	test_cmp expect actual &&
+
+	test-tool repository get_commit_tree_in_graph \
+		repo/.git repo "$(git -C repo rev-parse one)" >actual &&
+	git -C repo rev-parse one^{tree} >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'corrupt commit-graph write (broken parent)' '
+	rm -rf repo &&
+	git init repo &&
+	(
+		cd repo &&
+		empty="$(git mktree </dev/null)" &&
+		cat >broken <<-EOF &&
+		tree $empty
+		parent $ZERO_OID
+		author whatever <whatever@example.com> 1234 -0000
+		committer whatever <whatever@example.com> 1234 -0000
+
+		broken commit
+		EOF
+		broken="$(git hash-object -w -t commit --literally broken)" &&
+		git commit-tree -p "$broken" -m "good commit" "$empty" >good &&
+		test_must_fail git commit-graph write --stdin-commits \
+			<good 2>test_err &&
+		test_i18ngrep "unable to parse commit" test_err
+	)
+'
+
+test_expect_success 'corrupt commit-graph write (missing tree)' '
+	rm -rf repo &&
+	git init repo &&
+	(
+		cd repo &&
+		tree="$(git mktree </dev/null)" &&
+		cat >broken <<-EOF &&
+		parent $ZERO_OID
+		author whatever <whatever@example.com> 1234 -0000
+		committer whatever <whatever@example.com> 1234 -0000
+
+		broken commit
+		EOF
+		broken="$(git hash-object -w -t commit --literally broken)" &&
+		git commit-tree -p "$broken" -m "good" "$tree" >good &&
+		test_must_fail git commit-graph write --stdin-commits \
+			<good 2>test_err &&
+		test_i18ngrep "unable to parse commit" test_err
+	)
+'
+
+# We test the overflow-related code with the following repo history:
+#
+#               4:F - 5:N - 6:U
+#              /                \
+# 1:U - 2:N - 3:U                M:N
+#              \                /
+#               7:N - 8:F - 9:N
+#
+# Here the commits denoted by U have committer date of zero seconds
+# since Unix epoch, the commits denoted by N have committer date
+# starting from 1112354055 seconds since Unix epoch (default committer
+# date for the test suite), and the commits denoted by F have committer
+# date of (2 ^ 31 - 2) seconds since Unix epoch.
+#
+# The largest offset observed is 2 ^ 31, just large enough to overflow.
+#
+
+test_expect_success 'set up and verify repo with generation data overflow chunk' '
+	objdir=".git/objects" &&
+	UNIX_EPOCH_ZERO="@0 +0000" &&
+	FUTURE_DATE="@2147483646 +0000" &&
+	cd "$TRASH_DIRECTORY" &&
+	mkdir repo &&
+	cd repo &&
+	git init &&
+	test_commit --date "$UNIX_EPOCH_ZERO" 1 &&
+	test_commit 2 &&
+	test_commit --date "$UNIX_EPOCH_ZERO" 3 &&
+	git commit-graph write --reachable &&
+	graph_read_expect 3 generation_data &&
+	test_commit --date "$FUTURE_DATE" 4 &&
+	test_commit 5 &&
+	test_commit --date "$UNIX_EPOCH_ZERO" 6 &&
+	git branch left &&
+	git reset --hard 3 &&
+	test_commit 7 &&
+	test_commit --date "$FUTURE_DATE" 8 &&
+	test_commit 9 &&
+	git branch right &&
+	git reset --hard 3 &&
+	test_merge M left right &&
+	git commit-graph write --reachable &&
+	graph_read_expect 10 "generation_data generation_data_overflow" &&
+	git commit-graph verify
+'
+
+graph_git_behavior 'generation data overflow chunk repo' repo left right
+
+test_expect_success 'overflow during generation version upgrade' '
+	git init overflow-v2-upgrade &&
+	(
+		cd overflow-v2-upgrade &&
+
+		# This commit will have a date at two seconds past the Epoch,
+		# and a (v1) generation number of 1, since it is a root commit.
+		#
+		# The offset will then be computed as 1-2, which will underflow
+		# to 2^31, which is greater than the v2 offset small limit of
+		# 2^31-1.
+		#
+		# This is sufficient to need a large offset table for the v2
+		# generation numbers.
+		test_commit --date "@2 +0000" base &&
+		git repack -d &&
+
+		# Test that upgrading from generation v1 to v2 correctly
+		# produces the overflow table.
+		git -c commitGraph.generationVersion=1 commit-graph write &&
+		git -c commitGraph.generationVersion=2 commit-graph write \
+			--changed-paths &&
+
+		git rev-list --all
+	)
+'
+
+test_done