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   1 #!/bin/sh
   2
   3 test_description='split commit graph'
   4 . ./test-lib.sh
   5
   6 GIT_TEST_COMMIT_GRAPH=0
   7
   8 test_expect_success 'setup repo' '
   9         git init &&
  10         git config core.commitGraph true &&
  11         infodir=".git/objects/info" &&
  12         graphdir="$infodir/commit-graphs" &&
  13         test_oid_init
  14 '
  15
  16 graph_read_expect() {
  17         NUM_BASE=0
  18         if test ! -z $2
  19         then
  20                 NUM_BASE=$2
  21         fi
  22         cat >expect <<- EOF
  23         header: 43475048 1 1 3 $NUM_BASE
  24         num_commits: $1
  25         chunks: oid_fanout oid_lookup commit_metadata
  26         EOF
  27         git commit-graph read >output &&
  28         test_cmp expect output
  29 }
  30
  31 test_expect_success 'create commits and write commit-graph' '
  32         for i in $(test_seq 3)
  33         do
  34                 test_commit $i &&
  35                 git branch commits/$i || return 1
  36         done &&
  37         git commit-graph write --reachable &&
  38         test_path_is_file $infodir/commit-graph &&
  39         graph_read_expect 3
  40 '
  41
  42 graph_git_two_modes() {
  43         git -c core.commitGraph=true $1 >output
  44         git -c core.commitGraph=false $1 >expect
  45         test_cmp expect output
  46 }
  47
  48 graph_git_behavior() {
  49         MSG=$1
  50         BRANCH=$2
  51         COMPARE=$3
  52         test_expect_success "check normal git operations: $MSG" '
  53                 graph_git_two_modes "log --oneline $BRANCH" &&
  54                 graph_git_two_modes "log --topo-order $BRANCH" &&
  55                 graph_git_two_modes "log --graph $COMPARE..$BRANCH" &&
  56                 graph_git_two_modes "branch -vv" &&
  57                 graph_git_two_modes "merge-base -a $BRANCH $COMPARE"
  58         '
  59 }
  60
  61 graph_git_behavior 'graph exists' commits/3 commits/1
  62
  63 verify_chain_files_exist() {
  64         for hash in $(cat $1/commit-graph-chain)
  65         do
  66                 test_path_is_file $1/graph-$hash.graph || return 1
  67         done
  68 }
  69
  70 test_expect_success 'add more commits, and write a new base graph' '
  71         git reset --hard commits/1 &&
  72         for i in $(test_seq 4 5)
  73         do
  74                 test_commit $i &&
  75                 git branch commits/$i || return 1
  76         done &&
  77         git reset --hard commits/2 &&
  78         for i in $(test_seq 6 10)
  79         do
  80                 test_commit $i &&
  81                 git branch commits/$i || return 1
  82         done &&
  83         git reset --hard commits/2 &&
  84         git merge commits/4 &&
  85         git branch merge/1 &&
  86         git reset --hard commits/4 &&
  87         git merge commits/6 &&
  88         git branch merge/2 &&
  89         git commit-graph write --reachable &&
  90         graph_read_expect 12
  91 '
  92
  93 test_expect_success 'fork and fail to base a chain on a commit-graph file' '
  94         test_when_finished rm -rf fork &&
  95         git clone . fork &&
  96         (
  97                 cd fork &&
  98                 rm .git/objects/info/commit-graph &&
  99                 echo "$(pwd)/../.git/objects" >.git/objects/info/alternates &&
 100                 test_commit new-commit &&
 101                 git commit-graph write --reachable --split &&
 102                 test_path_is_file $graphdir/commit-graph-chain &&
 103                 test_line_count = 1 $graphdir/commit-graph-chain &&
 104                 verify_chain_files_exist $graphdir
 105         )
 106 '
 107
 108 test_expect_success 'add three more commits, write a tip graph' '
 109         git reset --hard commits/3 &&
 110         git merge merge/1 &&
 111         git merge commits/5 &&
 112         git merge merge/2 &&
 113         git branch merge/3 &&
 114         git commit-graph write --reachable --split &&
 115         test_path_is_missing $infodir/commit-graph &&
 116         test_path_is_file $graphdir/commit-graph-chain &&
 117         ls $graphdir/graph-*.graph >graph-files &&
 118         test_line_count = 2 graph-files &&
 119         verify_chain_files_exist $graphdir
 120 '
 121
 122 graph_git_behavior 'split commit-graph: merge 3 vs 2' merge/3 merge/2
 123
 124 test_expect_success 'add one commit, write a tip graph' '
 125         test_commit 11 &&
 126         git branch commits/11 &&
 127         git commit-graph write --reachable --split &&
 128         test_path_is_missing $infodir/commit-graph &&
 129         test_path_is_file $graphdir/commit-graph-chain &&
 130         ls $graphdir/graph-*.graph >graph-files &&
 131         test_line_count = 3 graph-files &&
 132         verify_chain_files_exist $graphdir
 133 '
 134
 135 graph_git_behavior 'three-layer commit-graph: commit 11 vs 6' commits/11 commits/6
 136
 137 test_expect_success 'add one commit, write a merged graph' '
 138         test_commit 12 &&
 139         git branch commits/12 &&
 140         git commit-graph write --reachable --split &&
 141         test_path_is_file $graphdir/commit-graph-chain &&
 142         test_line_count = 2 $graphdir/commit-graph-chain &&
 143         ls $graphdir/graph-*.graph >graph-files &&
 144         test_line_count = 2 graph-files &&
 145         verify_chain_files_exist $graphdir
 146 '
 147
 148 graph_git_behavior 'merged commit-graph: commit 12 vs 6' commits/12 commits/6
 149
 150 test_expect_success 'create fork and chain across alternate' '
 151         git clone . fork &&
 152         (
 153                 cd fork &&
 154                 git config core.commitGraph true &&
 155                 rm -rf $graphdir &&
 156                 echo "$(pwd)/../.git/objects" >.git/objects/info/alternates &&
 157                 test_commit 13 &&
 158                 git branch commits/13 &&
 159                 git commit-graph write --reachable --split &&
 160                 test_path_is_file $graphdir/commit-graph-chain &&
 161                 test_line_count = 3 $graphdir/commit-graph-chain &&
 162                 ls $graphdir/graph-*.graph >graph-files &&
 163                 test_line_count = 1 graph-files &&
 164                 git -c core.commitGraph=true  rev-list HEAD >expect &&
 165                 git -c core.commitGraph=false rev-list HEAD >actual &&
 166                 test_cmp expect actual &&
 167                 test_commit 14 &&
 168                 git commit-graph write --reachable --split --object-dir=.git/objects/ &&
 169                 test_line_count = 3 $graphdir/commit-graph-chain &&
 170                 ls $graphdir/graph-*.graph >graph-files &&
 171                 test_line_count = 1 graph-files
 172         )
 173 '
 174
 175 graph_git_behavior 'alternate: commit 13 vs 6' commits/13 commits/6
 176
 177 test_expect_success 'test merge stragety constants' '
 178         git clone . merge-2 &&
 179         (
 180                 cd merge-2 &&
 181                 git config core.commitGraph true &&
 182                 test_line_count = 2 $graphdir/commit-graph-chain &&
 183                 test_commit 14 &&
 184                 git commit-graph write --reachable --split --size-multiple=2 &&
 185                 test_line_count = 3 $graphdir/commit-graph-chain
 186
 187         ) &&
 188         git clone . merge-10 &&
 189         (
 190                 cd merge-10 &&
 191                 git config core.commitGraph true &&
 192                 test_line_count = 2 $graphdir/commit-graph-chain &&
 193                 test_commit 14 &&
 194                 git commit-graph write --reachable --split --size-multiple=10 &&
 195                 test_line_count = 1 $graphdir/commit-graph-chain &&
 196                 ls $graphdir/graph-*.graph >graph-files &&
 197                 test_line_count = 1 graph-files
 198         ) &&
 199         git clone . merge-10-expire &&
 200         (
 201                 cd merge-10-expire &&
 202                 git config core.commitGraph true &&
 203                 test_line_count = 2 $graphdir/commit-graph-chain &&
 204                 test_commit 15 &&
 205                 git commit-graph write --reachable --split --size-multiple=10 --expire-time=1980-01-01 &&
 206                 test_line_count = 1 $graphdir/commit-graph-chain &&
 207                 ls $graphdir/graph-*.graph >graph-files &&
 208                 test_line_count = 3 graph-files
 209         ) &&
 210         git clone --no-hardlinks . max-commits &&
 211         (
 212                 cd max-commits &&
 213                 git config core.commitGraph true &&
 214                 test_line_count = 2 $graphdir/commit-graph-chain &&
 215                 test_commit 16 &&
 216                 test_commit 17 &&
 217                 git commit-graph write --reachable --split --max-commits=1 &&
 218                 test_line_count = 1 $graphdir/commit-graph-chain &&
 219                 ls $graphdir/graph-*.graph >graph-files &&
 220                 test_line_count = 1 graph-files
 221         )
 222 '
 223
 224 test_expect_success 'remove commit-graph-chain file after flattening' '
 225         git clone . flatten &&
 226         (
 227                 cd flatten &&
 228                 test_line_count = 2 $graphdir/commit-graph-chain &&
 229                 git commit-graph write --reachable &&
 230                 test_path_is_missing $graphdir/commit-graph-chain &&
 231                 ls $graphdir >graph-files &&
 232                 test_line_count = 0 graph-files
 233         )
 234 '
 235
 236 corrupt_file() {
 237         file=$1
 238         pos=$2
 239         data="${3:-\0}"
 240         chmod a+w "$file" &&
 241         printf "$data" | dd of="$file" bs=1 seek="$pos" conv=notrunc
 242 }
 243
 244 test_expect_success 'verify hashes along chain, even in shallow' '
 245         git clone --no-hardlinks . verify &&
 246         (
 247                 cd verify &&
 248                 git commit-graph verify &&
 249                 base_file=$graphdir/graph-$(head -n 1 $graphdir/commit-graph-chain).graph &&
 250                 corrupt_file "$base_file" 1760 "\01" &&
 251                 test_must_fail git commit-graph verify --shallow 2>test_err &&
 252                 grep -v "^+" test_err >err &&
 253                 test_i18ngrep "incorrect checksum" err
 254         )
 255 '
 256
 257 test_expect_success 'verify --shallow does not check base contents' '
 258         git clone --no-hardlinks . verify-shallow &&
 259         (
 260                 cd verify-shallow &&
 261                 git commit-graph verify &&
 262                 base_file=$graphdir/graph-$(head -n 1 $graphdir/commit-graph-chain).graph &&
 263                 corrupt_file "$base_file" 1000 "\01" &&
 264                 git commit-graph verify --shallow &&
 265                 test_must_fail git commit-graph verify 2>test_err &&
 266                 grep -v "^+" test_err >err &&
 267                 test_i18ngrep "incorrect checksum" err
 268         )
 269 '
 270
 271 test_expect_success 'warn on base graph chunk incorrect' '
 272         git clone --no-hardlinks . base-chunk &&
 273         (
 274                 cd base-chunk &&
 275                 git commit-graph verify &&
 276                 base_file=$graphdir/graph-$(tail -n 1 $graphdir/commit-graph-chain).graph &&
 277                 corrupt_file "$base_file" 1376 "\01" &&
 278                 git commit-graph verify --shallow 2>test_err &&
 279                 grep -v "^+" test_err >err &&
 280                 test_i18ngrep "commit-graph chain does not match" err
 281         )
 282 '
 283
 284 test_expect_success 'verify after commit-graph-chain corruption' '
 285         git clone --no-hardlinks . verify-chain &&
 286         (
 287                 cd verify-chain &&
 288                 corrupt_file "$graphdir/commit-graph-chain" 60 "G" &&
 289                 git commit-graph verify 2>test_err &&
 290                 grep -v "^+" test_err >err &&
 291                 test_i18ngrep "invalid commit-graph chain" err &&
 292                 corrupt_file "$graphdir/commit-graph-chain" 60 "A" &&
 293                 git commit-graph verify 2>test_err &&
 294                 grep -v "^+" test_err >err &&
 295                 test_i18ngrep "unable to find all commit-graph files" err
 296         )
 297 '
 298
 299 test_expect_success 'verify across alternates' '
 300         git clone --no-hardlinks . verify-alt &&
 301         (
 302                 cd verify-alt &&
 303                 rm -rf $graphdir &&
 304                 altdir="$(pwd)/../.git/objects" &&
 305                 echo "$altdir" >.git/objects/info/alternates &&
 306                 git commit-graph verify --object-dir="$altdir/" &&
 307                 test_commit extra &&
 308                 git commit-graph write --reachable --split &&
 309                 tip_file=$graphdir/graph-$(tail -n 1 $graphdir/commit-graph-chain).graph &&
 310                 corrupt_file "$tip_file" 100 "\01" &&
 311                 test_must_fail git commit-graph verify --shallow 2>test_err &&
 312                 grep -v "^+" test_err >err &&
 313                 test_i18ngrep "commit-graph has incorrect fanout value" err
 314         )
 315 '
 316
 317 test_expect_success 'add octopus merge' '
 318         git reset --hard commits/10 &&
 319         git merge commits/3 commits/4 &&
 320         git branch merge/octopus &&
 321         git commit-graph write --reachable --split &&
 322         git commit-graph verify &&
 323         test_line_count = 3 $graphdir/commit-graph-chain
 324 '
 325
 326 graph_git_behavior 'graph exists' merge/octopus commits/12
 327
 328 test_expect_success 'split across alternate where alternate is not split' '
 329         git commit-graph write --reachable &&
 330         test_path_is_file .git/objects/info/commit-graph &&
 331         cp .git/objects/info/commit-graph . &&
 332         git clone --no-hardlinks . alt-split &&
 333         (
 334                 cd alt-split &&
 335                 echo "$(pwd)"/../.git/objects >.git/objects/info/alternates &&
 336                 test_commit 18 &&
 337                 git commit-graph write --reachable --split &&
 338                 test_line_count = 1 $graphdir/commit-graph-chain
 339         ) &&
 340         test_cmp commit-graph .git/objects/info/commit-graph
 341 '
 342
 343 test_done