#!/bin/sh
test_description='split commit graph'
TEST_PASSES_SANITIZE_LEAK=true
. ./test-lib.sh
. "$TEST_DIRECTORY"/lib-chunk.sh
GIT_TEST_COMMIT_GRAPH=0
GIT_TEST_COMMIT_GRAPH_CHANGED_PATHS=0
test_expect_success 'setup repo' '
git init &&
git config core.commitGraph true &&
git config gc.writeCommitGraph false &&
objdir=".git/objects" &&
infodir="$objdir/info" &&
graphdir="$infodir/commit-graphs" &&
test_oid_cache <<-EOM
shallow sha1:2132
shallow sha256:2436
base sha1:1408
base sha256:1528
oid_version sha1:1
oid_version sha256:2
EOM
'
graph_read_expect() {
NUM_BASE=0
if test ! -z $2
then
NUM_BASE=$2
fi
OPTIONS=
if test -z "$3"
then
OPTIONS=" read_generation_data"
fi
cat >expect <<- EOF
header: 43475048 1 $(test_oid oid_version) 4 $NUM_BASE
num_commits: $1
chunks: oid_fanout oid_lookup commit_metadata generation_data
options:$OPTIONS
EOF
test-tool read-graph >output &&
test_cmp expect output
}
test_expect_success POSIXPERM 'tweak umask for modebit tests' '
umask 022
'
test_expect_success 'create commits and write commit-graph' '
for i in $(test_seq 3)
do
test_commit $i &&
git branch commits/$i || return 1
done &&
git commit-graph write --reachable &&
test_path_is_file $infodir/commit-graph &&
graph_read_expect 3
'
graph_git_two_modes() {
git ${2:+ -C "$2"} -c core.commitGraph=true $1 >output &&
git ${2:+ -C "$2"} -c core.commitGraph=false $1 >expect &&
test_cmp expect output
}
graph_git_behavior() {
MSG=$1
BRANCH=$2
COMPARE=$3
DIR=$4
test_expect_success "check normal git operations: $MSG" '
graph_git_two_modes "log --oneline $BRANCH" "$DIR" &&
graph_git_two_modes "log --topo-order $BRANCH" "$DIR" &&
graph_git_two_modes "log --graph $COMPARE..$BRANCH" "$DIR" &&
graph_git_two_modes "branch -vv" "$DIR" &&
graph_git_two_modes "merge-base -a $BRANCH $COMPARE" "$DIR"
'
}
graph_git_behavior 'graph exists' commits/3 commits/1
verify_chain_files_exist() {
for hash in $(cat $1/commit-graph-chain)
do
test_path_is_file $1/graph-$hash.graph || return 1
done
}
test_expect_success 'add more commits, and write a new base graph' '
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 10)
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 commit-graph write --reachable &&
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 &&
git merge commits/5 &&
git merge merge/2 &&
git branch merge/3 &&
git commit-graph write --reachable --split &&
test_path_is_missing $infodir/commit-graph &&
test_path_is_file $graphdir/commit-graph-chain &&
ls $graphdir/graph-*.graph >graph-files &&
test_line_count = 2 graph-files &&
verify_chain_files_exist $graphdir
'
graph_git_behavior 'split commit-graph: merge 3 vs 2' merge/3 merge/2
test_expect_success 'add one commit, write a tip graph' '
test_commit 11 &&
git branch commits/11 &&
git commit-graph write --reachable --split &&
test_path_is_missing $infodir/commit-graph &&
test_path_is_file $graphdir/commit-graph-chain &&
ls $graphdir/graph-*.graph >graph-files &&
test_line_count = 3 graph-files &&
verify_chain_files_exist $graphdir
'
graph_git_behavior 'three-layer commit-graph: commit 11 vs 6' commits/11 commits/6
test_expect_success 'add one commit, write a merged graph' '
test_commit 12 &&
git branch commits/12 &&
git commit-graph write --reachable --split &&
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 = 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
)
'
if test -d fork
then
graph_git_behavior 'alternate: commit 13 vs 6' commits/13 origin/commits/6 "fork"
fi
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 &&
touch $graphdir/to-delete.graph $graphdir/to-keep.graph &&
test-tool chmtime =1546362000 $graphdir/to-delete.graph &&
test-tool chmtime =1546362001 $graphdir/to-keep.graph &&
git commit-graph write --reachable --split --size-multiple=10 \
--expire-time="2019-01-01 12:00 -05:00" &&
test_line_count = 1 $graphdir/commit-graph-chain &&
test_path_is_missing $graphdir/to-delete.graph &&
test_path_is_file $graphdir/to-keep.graph &&
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" $(test_oid shallow) "\01" &&
test_must_fail git commit-graph verify --shallow 2>test_err &&
grep -v "^+" test_err >err &&
test_grep "incorrect checksum" err
)
'
test_expect_success 'verify notices chain slice which is bogus (base)' '
git clone --no-hardlinks . verify-chain-bogus-base &&
(
cd verify-chain-bogus-base &&
git commit-graph verify &&
base_file=$graphdir/graph-$(sed -n 1p $graphdir/commit-graph-chain).graph &&
echo "garbage" >$base_file &&
test_must_fail git commit-graph verify 2>test_err &&
grep -v "^+" test_err >err &&
grep "commit-graph file is too small" err
)
'
test_expect_success 'verify notices chain slice which is bogus (tip)' '
git clone --no-hardlinks . verify-chain-bogus-tip &&
(
cd verify-chain-bogus-tip &&
git commit-graph verify &&
tip_file=$graphdir/graph-$(sed -n 2p $graphdir/commit-graph-chain).graph &&
echo "garbage" >$tip_file &&
test_must_fail git commit-graph verify 2>test_err &&
grep -v "^+" test_err >err &&
grep "commit-graph file is too small" 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" 1500 "\01" &&
git commit-graph verify --shallow &&
test_must_fail git commit-graph verify 2>test_err &&
grep -v "^+" test_err >err &&
test_grep "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" $(test_oid base) "\01" &&
test_must_fail git commit-graph verify --shallow 2>test_err &&
grep -v "^+" test_err >err &&
test_grep "commit-graph chain does not match" err
)
'
test_expect_success 'verify after commit-graph-chain corruption (base)' '
git clone --no-hardlinks . verify-chain-base &&
(
cd verify-chain-base &&
corrupt_file "$graphdir/commit-graph-chain" 30 "G" &&
test_must_fail git commit-graph verify 2>test_err &&
grep -v "^+" test_err >err &&
test_grep "invalid commit-graph chain" err &&
corrupt_file "$graphdir/commit-graph-chain" 30 "A" &&
test_must_fail git commit-graph verify 2>test_err &&
grep -v "^+" test_err >err &&
test_grep "unable to find all commit-graph files" err
)
'
test_expect_success 'verify after commit-graph-chain corruption (tip)' '
git clone --no-hardlinks . verify-chain-tip &&
(
cd verify-chain-tip &&
corrupt_file "$graphdir/commit-graph-chain" 70 "G" &&
test_must_fail git commit-graph verify 2>test_err &&
grep -v "^+" test_err >err &&
test_grep "invalid commit-graph chain" err &&
corrupt_file "$graphdir/commit-graph-chain" 70 "A" &&
test_must_fail git commit-graph verify 2>test_err &&
grep -v "^+" test_err >err &&
test_grep "unable to find all commit-graph files" err
)
'
test_expect_success 'verify notices too-short chain file' '
git clone --no-hardlinks . verify-chain-short &&
(
cd verify-chain-short &&
git commit-graph verify &&
echo "garbage" >$graphdir/commit-graph-chain &&
test_must_fail git commit-graph verify 2>test_err &&
grep -v "^+" test_err >err &&
grep "commit-graph chain file too small" 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" 1500 "\01" &&
test_must_fail git commit-graph verify --shallow 2>test_err &&
grep -v "^+" test_err >err &&
test_grep "incorrect checksum" err
)
'
test_expect_success 'reader bounds-checks base-graph chunk' '
git clone --no-hardlinks . corrupt-base-chunk &&
(
cd corrupt-base-chunk &&
tip_file=$graphdir/graph-$(tail -n 1 $graphdir/commit-graph-chain).graph &&
corrupt_chunk_file "$tip_file" BASE clear 01020304 &&
git -c core.commitGraph=false log >expect.out &&
git -c core.commitGraph=true log >out 2>err &&
test_cmp expect.out out &&
grep "commit-graph base graphs chunk is too small" 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 --progress 2>err &&
test_line_count = 1 err &&
grep "Verifying commits in commit graph: 100% (18/18)" err &&
test_grep ! warning err &&
test_line_count = 3 $graphdir/commit-graph-chain
'
graph_git_behavior 'graph exists' merge/octopus commits/12
test_expect_success 'split across alternate where alternate is not split' '
git commit-graph write --reachable &&
test_path_is_file .git/objects/info/commit-graph &&
cp .git/objects/info/commit-graph . &&
git clone --no-hardlinks . alt-split &&
(
cd alt-split &&
rm -f .git/objects/info/commit-graph &&
echo "$(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_expect_success '--split=no-merge always writes an incremental' '
test_when_finished rm -rf a b &&
rm -rf $graphdir $infodir/commit-graph &&
git reset --hard commits/2 &&
git rev-list HEAD~1 >a &&
git rev-list HEAD >b &&
git commit-graph write --split --stdin-commits <a &&
git commit-graph write --split=no-merge --stdin-commits <b &&
test_line_count = 2 $graphdir/commit-graph-chain
'
test_expect_success '--split=replace replaces the chain' '
rm -rf $graphdir $infodir/commit-graph &&
git reset --hard commits/3 &&
git rev-list -1 HEAD~2 >a &&
git rev-list -1 HEAD~1 >b &&
git rev-list -1 HEAD >c &&
git commit-graph write --split=no-merge --stdin-commits <a &&
git commit-graph write --split=no-merge --stdin-commits <b &&
git commit-graph write --split=no-merge --stdin-commits <c &&
test_line_count = 3 $graphdir/commit-graph-chain &&
git commit-graph write --stdin-commits --split=replace <b &&
test_path_is_missing $infodir/commit-graph &&
test_path_is_file $graphdir/commit-graph-chain &&
ls $graphdir/graph-*.graph >graph-files &&
test_line_count = 1 graph-files &&
verify_chain_files_exist $graphdir &&
graph_read_expect 2
'
test_expect_success ULIMIT_FILE_DESCRIPTORS 'handles file descriptor exhaustion' '
git init ulimit &&
(
cd ulimit &&
for i in $(test_seq 64)
do
test_commit $i &&
run_with_limited_open_files test_might_fail git commit-graph write \
--split=no-merge --reachable || return 1
done
)
'
while read mode modebits
do
test_expect_success POSIXPERM "split commit-graph respects core.sharedrepository $mode" '
rm -rf $graphdir $infodir/commit-graph &&
git reset --hard commits/1 &&
test_config core.sharedrepository "$mode" &&
git commit-graph write --split --reachable &&
ls $graphdir/graph-*.graph >graph-files &&
test_line_count = 1 graph-files &&
echo "$modebits" >expect &&
test_modebits $graphdir/graph-*.graph >actual &&
test_cmp expect actual &&
test_modebits $graphdir/commit-graph-chain >actual &&
test_cmp expect actual
'
done <<\EOF
0666 -r--r--r--
0600 -r--------
EOF
test_expect_success '--split=replace with partial Bloom data' '
rm -rf $graphdir $infodir/commit-graph &&
git reset --hard commits/3 &&
git rev-list -1 HEAD~2 >a &&
git rev-list -1 HEAD~1 >b &&
git commit-graph write --split=no-merge --stdin-commits --changed-paths <a &&
git commit-graph write --split=no-merge --stdin-commits <b &&
git commit-graph write --split=replace --stdin-commits --changed-paths <c &&
ls $graphdir/graph-*.graph >graph-files &&
test_line_count = 1 graph-files &&
verify_chain_files_exist $graphdir
'
test_expect_success 'prevent regression for duplicate commits across layers' '
git init dup &&
git -C dup commit --allow-empty -m one &&
git -C dup -c core.commitGraph=false commit-graph write --split=no-merge --reachable 2>err &&
test_grep "attempting to write a commit-graph" err &&
git -C dup commit-graph write --split=no-merge --reachable &&
git -C dup commit --allow-empty -m two &&
git -C dup commit-graph write --split=no-merge --reachable &&
git -C dup commit --allow-empty -m three &&
git -C dup commit-graph write --split --reachable &&
git -C dup commit-graph verify
'
NUM_FIRST_LAYER_COMMITS=64
NUM_SECOND_LAYER_COMMITS=16
NUM_THIRD_LAYER_COMMITS=7
NUM_FOURTH_LAYER_COMMITS=8
NUM_FIFTH_LAYER_COMMITS=16
SECOND_LAYER_SEQUENCE_START=$(($NUM_FIRST_LAYER_COMMITS + 1))
SECOND_LAYER_SEQUENCE_END=$(($SECOND_LAYER_SEQUENCE_START + $NUM_SECOND_LAYER_COMMITS - 1))
THIRD_LAYER_SEQUENCE_START=$(($SECOND_LAYER_SEQUENCE_END + 1))
THIRD_LAYER_SEQUENCE_END=$(($THIRD_LAYER_SEQUENCE_START + $NUM_THIRD_LAYER_COMMITS - 1))
FOURTH_LAYER_SEQUENCE_START=$(($THIRD_LAYER_SEQUENCE_END + 1))
FOURTH_LAYER_SEQUENCE_END=$(($FOURTH_LAYER_SEQUENCE_START + $NUM_FOURTH_LAYER_COMMITS - 1))
FIFTH_LAYER_SEQUENCE_START=$(($FOURTH_LAYER_SEQUENCE_END + 1))
FIFTH_LAYER_SEQUENCE_END=$(($FIFTH_LAYER_SEQUENCE_START + $NUM_FIFTH_LAYER_COMMITS - 1))
# Current split graph chain:
#
# 16 commits (No GDAT)
# ------------------------
# 64 commits (GDAT)
#
test_expect_success 'setup repo for mixed generation commit-graph-chain' '
graphdir=".git/objects/info/commit-graphs" &&
test_oid_cache <<-EOF &&
oid_version sha1:1
oid_version sha256:2
EOF
git init mixed &&
(
cd mixed &&
git config core.commitGraph true &&
git config gc.writeCommitGraph false &&
for i in $(test_seq $NUM_FIRST_LAYER_COMMITS)
do
test_commit $i &&
git branch commits/$i || return 1
done &&
git -c commitGraph.generationVersion=2 commit-graph write --reachable --split &&
graph_read_expect $NUM_FIRST_LAYER_COMMITS &&
test_line_count = 1 $graphdir/commit-graph-chain &&
for i in $(test_seq $SECOND_LAYER_SEQUENCE_START $SECOND_LAYER_SEQUENCE_END)
do
test_commit $i &&
git branch commits/$i || return 1
done &&
git -c commitGraph.generationVersion=1 commit-graph write --reachable --split=no-merge &&
test_line_count = 2 $graphdir/commit-graph-chain &&
test-tool read-graph >output &&
cat >expect <<-EOF &&
header: 43475048 1 $(test_oid oid_version) 4 1
num_commits: $NUM_SECOND_LAYER_COMMITS
chunks: oid_fanout oid_lookup commit_metadata
options:
EOF
test_cmp expect output &&
git commit-graph verify &&
cat $graphdir/commit-graph-chain
)
'
# The new layer will be added without generation data chunk as it was not
# present on the layer underneath it.
#
# 7 commits (No GDAT)
# ------------------------
# 16 commits (No GDAT)
# ------------------------
# 64 commits (GDAT)
#
test_expect_success 'do not write generation data chunk if not present on existing tip' '
git clone mixed mixed-no-gdat &&
(
cd mixed-no-gdat &&
for i in $(test_seq $THIRD_LAYER_SEQUENCE_START $THIRD_LAYER_SEQUENCE_END)
do
test_commit $i &&
git branch commits/$i || return 1
done &&
git commit-graph write --reachable --split=no-merge &&
test_line_count = 3 $graphdir/commit-graph-chain &&
test-tool read-graph >output &&
cat >expect <<-EOF &&
header: 43475048 1 $(test_oid oid_version) 4 2
num_commits: $NUM_THIRD_LAYER_COMMITS
chunks: oid_fanout oid_lookup commit_metadata
options:
EOF
test_cmp expect output &&
git commit-graph verify
)
'
# Number of commits in each layer of the split-commit graph before merge:
#
# 8 commits (No GDAT)
# ------------------------
# 7 commits (No GDAT)
# ------------------------
# 16 commits (No GDAT)
# ------------------------
# 64 commits (GDAT)
#
# The top two layers are merged and do not have generation data chunk as layer below them does
# not have generation data chunk.
#
# 15 commits (No GDAT)
# ------------------------
# 16 commits (No GDAT)
# ------------------------
# 64 commits (GDAT)
#
test_expect_success 'do not write generation data chunk if the topmost remaining layer does not have generation data chunk' '
git clone mixed-no-gdat mixed-merge-no-gdat &&
(
cd mixed-merge-no-gdat &&
for i in $(test_seq $FOURTH_LAYER_SEQUENCE_START $FOURTH_LAYER_SEQUENCE_END)
do
test_commit $i &&
git branch commits/$i || return 1
done &&
git commit-graph write --reachable --split --size-multiple 1 &&
test_line_count = 3 $graphdir/commit-graph-chain &&
test-tool read-graph >output &&
cat >expect <<-EOF &&
header: 43475048 1 $(test_oid oid_version) 4 2
num_commits: $(($NUM_THIRD_LAYER_COMMITS + $NUM_FOURTH_LAYER_COMMITS))
chunks: oid_fanout oid_lookup commit_metadata
options:
EOF
test_cmp expect output &&
git commit-graph verify
)
'
# Number of commits in each layer of the split-commit graph before merge:
#
# 16 commits (No GDAT)
# ------------------------
# 15 commits (No GDAT)
# ------------------------
# 16 commits (No GDAT)
# ------------------------
# 64 commits (GDAT)
#
# The top three layers are merged and has generation data chunk as the topmost remaining layer
# has generation data chunk.
#
# 47 commits (GDAT)
# ------------------------
# 64 commits (GDAT)
#
test_expect_success 'write generation data chunk if topmost remaining layer has generation data chunk' '
git clone mixed-merge-no-gdat mixed-merge-gdat &&
(
cd mixed-merge-gdat &&
for i in $(test_seq $FIFTH_LAYER_SEQUENCE_START $FIFTH_LAYER_SEQUENCE_END)
do
test_commit $i &&
git branch commits/$i || return 1
done &&
git commit-graph write --reachable --split --size-multiple 1 &&
test_line_count = 2 $graphdir/commit-graph-chain &&
test-tool read-graph >output &&
cat >expect <<-EOF &&
header: 43475048 1 $(test_oid oid_version) 5 1
num_commits: $(($NUM_SECOND_LAYER_COMMITS + $NUM_THIRD_LAYER_COMMITS + $NUM_FOURTH_LAYER_COMMITS + $NUM_FIFTH_LAYER_COMMITS))
chunks: oid_fanout oid_lookup commit_metadata generation_data
options: read_generation_data
EOF
test_cmp expect output
)
'
test_expect_success 'write generation data chunk when commit-graph chain is replaced' '
git clone mixed mixed-replace &&
(
cd mixed-replace &&
git commit-graph write --reachable --split=replace &&
test_path_is_file $graphdir/commit-graph-chain &&
test_line_count = 1 $graphdir/commit-graph-chain &&
verify_chain_files_exist $graphdir &&
graph_read_expect $(($NUM_FIRST_LAYER_COMMITS + $NUM_SECOND_LAYER_COMMITS)) &&
git commit-graph verify
)
'
test_expect_success 'temporary graph layer is discarded upon failure' '
git init layer-discard &&
(
cd layer-discard &&
test_commit A &&
test_commit B &&
# Intentionally remove commit "A" from the object store
# so that the commit-graph machinery fails to parse the
# parents of "B".
#
# This takes place after the commit-graph machinery has
# initialized a new temporary file to store the contents
# of the new graph layer, so will allow us to ensure
# that the temporary file is discarded upon failure.
rm $objdir/$(test_oid_to_path $(git rev-parse HEAD^)) &&
test_must_fail git commit-graph write --reachable --split &&
test_dir_is_empty $graphdir
)
'
test_done
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