graph_read_expect 12
'
+test_expect_success 'fork and fail to base a chain on a commit-graph file' '
+ test_when_finished rm -rf fork &&
+ git clone . fork &&
+ (
+ cd fork &&
+ rm .git/objects/info/commit-graph &&
+ echo "$(pwd)/../.git/objects" >.git/objects/info/alternates &&
+ test_commit new-commit &&
+ git commit-graph write --reachable --split &&
+ test_path_is_file $graphdir/commit-graph-chain &&
+ test_line_count = 1 $graphdir/commit-graph-chain &&
+ verify_chain_files_exist $graphdir
+ )
+'
+
test_expect_success 'add three more commits, write a tip graph' '
git reset --hard commits/3 &&
git merge merge/1 &&
test_path_is_file $graphdir/commit-graph-chain &&
test_line_count = 2 $graphdir/commit-graph-chain &&
ls $graphdir/graph-*.graph >graph-files &&
- test_line_count = 4 graph-files &&
+ test_line_count = 2 graph-files &&
verify_chain_files_exist $graphdir
'
graph_git_behavior 'merged commit-graph: commit 12 vs 6' commits/12 commits/6
+test_expect_success 'create fork and chain across alternate' '
+ git clone . fork &&
+ (
+ cd fork &&
+ git config core.commitGraph true &&
+ rm -rf $graphdir &&
+ echo "$(pwd)/../.git/objects" >.git/objects/info/alternates &&
+ test_commit 13 &&
+ git branch commits/13 &&
+ git commit-graph write --reachable --split &&
+ test_path_is_file $graphdir/commit-graph-chain &&
+ test_line_count = 3 $graphdir/commit-graph-chain &&
+ ls $graphdir/graph-*.graph >graph-files &&
+ test_line_count = 1 graph-files &&
+ git -c core.commitGraph=true rev-list HEAD >expect &&
+ git -c core.commitGraph=false rev-list HEAD >actual &&
+ test_cmp expect actual &&
+ test_commit 14 &&
+ git commit-graph write --reachable --split --object-dir=.git/objects/ &&
+ test_line_count = 3 $graphdir/commit-graph-chain &&
+ ls $graphdir/graph-*.graph >graph-files &&
+ test_line_count = 1 graph-files
+ )
+'
+
+graph_git_behavior 'alternate: commit 13 vs 6' commits/13 commits/6
+
+test_expect_success 'test merge stragety constants' '
+ git clone . merge-2 &&
+ (
+ cd merge-2 &&
+ git config core.commitGraph true &&
+ test_line_count = 2 $graphdir/commit-graph-chain &&
+ test_commit 14 &&
+ git commit-graph write --reachable --split --size-multiple=2 &&
+ test_line_count = 3 $graphdir/commit-graph-chain
+
+ ) &&
+ git clone . merge-10 &&
+ (
+ cd merge-10 &&
+ git config core.commitGraph true &&
+ test_line_count = 2 $graphdir/commit-graph-chain &&
+ test_commit 14 &&
+ git commit-graph write --reachable --split --size-multiple=10 &&
+ test_line_count = 1 $graphdir/commit-graph-chain &&
+ ls $graphdir/graph-*.graph >graph-files &&
+ test_line_count = 1 graph-files
+ ) &&
+ git clone . merge-10-expire &&
+ (
+ cd merge-10-expire &&
+ git config core.commitGraph true &&
+ test_line_count = 2 $graphdir/commit-graph-chain &&
+ test_commit 15 &&
+ git commit-graph write --reachable --split --size-multiple=10 --expire-time=1980-01-01 &&
+ test_line_count = 1 $graphdir/commit-graph-chain &&
+ ls $graphdir/graph-*.graph >graph-files &&
+ test_line_count = 3 graph-files
+ ) &&
+ git clone --no-hardlinks . max-commits &&
+ (
+ cd max-commits &&
+ git config core.commitGraph true &&
+ test_line_count = 2 $graphdir/commit-graph-chain &&
+ test_commit 16 &&
+ test_commit 17 &&
+ git commit-graph write --reachable --split --max-commits=1 &&
+ test_line_count = 1 $graphdir/commit-graph-chain &&
+ ls $graphdir/graph-*.graph >graph-files &&
+ test_line_count = 1 graph-files
+ )
+'
+
+test_expect_success 'remove commit-graph-chain file after flattening' '
+ git clone . flatten &&
+ (
+ cd flatten &&
+ test_line_count = 2 $graphdir/commit-graph-chain &&
+ git commit-graph write --reachable &&
+ test_path_is_missing $graphdir/commit-graph-chain &&
+ ls $graphdir >graph-files &&
+ test_line_count = 0 graph-files
+ )
+'
+
+corrupt_file() {
+ file=$1
+ pos=$2
+ data="${3:-\0}"
+ chmod a+w "$file" &&
+ printf "$data" | dd of="$file" bs=1 seek="$pos" conv=notrunc
+}
+
+test_expect_success 'verify hashes along chain, even in shallow' '
+ git clone --no-hardlinks . verify &&
+ (
+ cd verify &&
+ git commit-graph verify &&
+ base_file=$graphdir/graph-$(head -n 1 $graphdir/commit-graph-chain).graph &&
+ corrupt_file "$base_file" 1760 "\01" &&
+ test_must_fail git commit-graph verify --shallow 2>test_err &&
+ grep -v "^+" test_err >err &&
+ test_i18ngrep "incorrect checksum" err
+ )
+'
+
+test_expect_success 'verify --shallow does not check base contents' '
+ git clone --no-hardlinks . verify-shallow &&
+ (
+ cd verify-shallow &&
+ git commit-graph verify &&
+ base_file=$graphdir/graph-$(head -n 1 $graphdir/commit-graph-chain).graph &&
+ corrupt_file "$base_file" 1000 "\01" &&
+ git commit-graph verify --shallow &&
+ test_must_fail git commit-graph verify 2>test_err &&
+ grep -v "^+" test_err >err &&
+ test_i18ngrep "incorrect checksum" err
+ )
+'
+
+test_expect_success 'warn on base graph chunk incorrect' '
+ git clone --no-hardlinks . base-chunk &&
+ (
+ cd base-chunk &&
+ git commit-graph verify &&
+ base_file=$graphdir/graph-$(tail -n 1 $graphdir/commit-graph-chain).graph &&
+ corrupt_file "$base_file" 1376 "\01" &&
+ git commit-graph verify --shallow 2>test_err &&
+ grep -v "^+" test_err >err &&
+ test_i18ngrep "commit-graph chain does not match" err
+ )
+'
+
+test_expect_success 'verify after commit-graph-chain corruption' '
+ git clone --no-hardlinks . verify-chain &&
+ (
+ cd verify-chain &&
+ corrupt_file "$graphdir/commit-graph-chain" 60 "G" &&
+ git commit-graph verify 2>test_err &&
+ grep -v "^+" test_err >err &&
+ test_i18ngrep "invalid commit-graph chain" err &&
+ corrupt_file "$graphdir/commit-graph-chain" 60 "A" &&
+ git commit-graph verify 2>test_err &&
+ grep -v "^+" test_err >err &&
+ test_i18ngrep "unable to find all commit-graph files" err
+ )
+'
+
+test_expect_success 'verify across alternates' '
+ git clone --no-hardlinks . verify-alt &&
+ (
+ cd verify-alt &&
+ rm -rf $graphdir &&
+ altdir="$(pwd)/../.git/objects" &&
+ echo "$altdir" >.git/objects/info/alternates &&
+ git commit-graph verify --object-dir="$altdir/" &&
+ test_commit extra &&
+ git commit-graph write --reachable --split &&
+ tip_file=$graphdir/graph-$(tail -n 1 $graphdir/commit-graph-chain).graph &&
+ corrupt_file "$tip_file" 100 "\01" &&
+ test_must_fail git commit-graph verify --shallow 2>test_err &&
+ grep -v "^+" test_err >err &&
+ test_i18ngrep "commit-graph has incorrect fanout value" err
+ )
+'
+
+test_expect_success 'add octopus merge' '
+ git reset --hard commits/10 &&
+ git merge commits/3 commits/4 &&
+ git branch merge/octopus &&
+ git commit-graph write --reachable --split &&
+ git commit-graph verify 2>err &&
+ test_line_count = 3 err &&
+ test_i18ngrep ! warning err &&
+ test_line_count = 3 $graphdir/commit-graph-chain
+'
+
+graph_git_behavior 'graph exists' merge/octopus commits/12
+
+test_expect_success 'split across alternate where alternate is not split' '
+ git commit-graph write --reachable &&
+ test_path_is_file .git/objects/info/commit-graph &&
+ cp .git/objects/info/commit-graph . &&
+ git clone --no-hardlinks . alt-split &&
+ (
+ cd alt-split &&
+ echo "$(pwd)"/../.git/objects >.git/objects/info/alternates &&
+ test_commit 18 &&
+ git commit-graph write --reachable --split &&
+ test_line_count = 1 $graphdir/commit-graph-chain
+ ) &&
+ test_cmp commit-graph .git/objects/info/commit-graph
+'
+
test_done