t/t5310-pack-bitmaps.sh

   1 #!/bin/sh
   2
   3 test_description='exercise basic bitmap functionality'
   4
   5 . ./test-lib.sh
   6 . "$TEST_DIRECTORY"/lib-bitmap.sh
   7
   8 # t5310 deals only with single-pack bitmaps, so don't write MIDX bitmaps in
   9 # their place.
  10 GIT_TEST_MULTI_PACK_INDEX_WRITE_BITMAP=0
  11
  12 objpath () {
  13         echo ".git/objects/$(echo "$1" | sed -e 's|\(..\)|\1/|')"
  14 }
  15
  16 # show objects present in pack ($1 should be associated *.idx)
  17 list_packed_objects () {
  18         git show-index <"$1" >object-list &&
  19         cut -d' ' -f2 object-list
  20 }
  21
  22 # has_any pattern-file content-file
  23 # tests whether content-file has any entry from pattern-file with entries being
  24 # whole lines.
  25 has_any () {
  26         grep -Ff "$1" "$2"
  27 }
  28
  29 setup_bitmap_history
  30
  31 test_expect_success 'setup writing bitmaps during repack' '
  32         git config repack.writeBitmaps true
  33 '
  34
  35 test_expect_success 'full repack creates bitmaps' '
  36         GIT_TRACE2_EVENT="$(pwd)/trace" \
  37                 git repack -ad &&
  38         ls .git/objects/pack/ | grep bitmap >output &&
  39         test_line_count = 1 output &&
  40         grep "\"key\":\"num_selected_commits\",\"value\":\"106\"" trace &&
  41         grep "\"key\":\"num_maximal_commits\",\"value\":\"107\"" trace
  42 '
  43
  44 basic_bitmap_tests
  45
  46 test_expect_success 'incremental repack fails when bitmaps are requested' '
  47         test_commit more-1 &&
  48         test_must_fail git repack -d 2>err &&
  49         test_i18ngrep "Incremental repacks are incompatible with bitmap" err
  50 '
  51
  52 test_expect_success 'incremental repack can disable bitmaps' '
  53         test_commit more-2 &&
  54         git repack -d --no-write-bitmap-index
  55 '
  56
  57 test_expect_success 'pack-objects respects --local (non-local loose)' '
  58         git init --bare alt.git &&
  59         echo $(pwd)/alt.git/objects >.git/objects/info/alternates &&
  60         echo content1 >file1 &&
  61         # non-local loose object which is not present in bitmapped pack
  62         altblob=$(GIT_DIR=alt.git git hash-object -w file1) &&
  63         # non-local loose object which is also present in bitmapped pack
  64         git cat-file blob $blob | GIT_DIR=alt.git git hash-object -w --stdin &&
  65         git add file1 &&
  66         test_tick &&
  67         git commit -m commit_file1 &&
  68         echo HEAD | git pack-objects --local --stdout --revs >1.pack &&
  69         git index-pack 1.pack &&
  70         list_packed_objects 1.idx >1.objects &&
  71         printf "%s\n" "$altblob" "$blob" >nonlocal-loose &&
  72         ! has_any nonlocal-loose 1.objects
  73 '
  74
  75 test_expect_success 'pack-objects respects --honor-pack-keep (local non-bitmapped pack)' '
  76         echo content2 >file2 &&
  77         blob2=$(git hash-object -w file2) &&
  78         git add file2 &&
  79         test_tick &&
  80         git commit -m commit_file2 &&
  81         printf "%s\n" "$blob2" "$bitmaptip" >keepobjects &&
  82         pack2=$(git pack-objects pack2 <keepobjects) &&
  83         mv pack2-$pack2.* .git/objects/pack/ &&
  84         >.git/objects/pack/pack2-$pack2.keep &&
  85         rm $(objpath $blob2) &&
  86         echo HEAD | git pack-objects --honor-pack-keep --stdout --revs >2a.pack &&
  87         git index-pack 2a.pack &&
  88         list_packed_objects 2a.idx >2a.objects &&
  89         ! has_any keepobjects 2a.objects
  90 '
  91
  92 test_expect_success 'pack-objects respects --local (non-local pack)' '
  93         mv .git/objects/pack/pack2-$pack2.* alt.git/objects/pack/ &&
  94         echo HEAD | git pack-objects --local --stdout --revs >2b.pack &&
  95         git index-pack 2b.pack &&
  96         list_packed_objects 2b.idx >2b.objects &&
  97         ! has_any keepobjects 2b.objects
  98 '
  99
 100 test_expect_success 'pack-objects respects --honor-pack-keep (local bitmapped pack)' '
 101         ls .git/objects/pack/ | grep bitmap >output &&
 102         test_line_count = 1 output &&
 103         packbitmap=$(basename $(cat output) .bitmap) &&
 104         list_packed_objects .git/objects/pack/$packbitmap.idx >packbitmap.objects &&
 105         test_when_finished "rm -f .git/objects/pack/$packbitmap.keep" &&
 106         >.git/objects/pack/$packbitmap.keep &&
 107         echo HEAD | git pack-objects --honor-pack-keep --stdout --revs >3a.pack &&
 108         git index-pack 3a.pack &&
 109         list_packed_objects 3a.idx >3a.objects &&
 110         ! has_any packbitmap.objects 3a.objects
 111 '
 112
 113 test_expect_success 'pack-objects respects --local (non-local bitmapped pack)' '
 114         mv .git/objects/pack/$packbitmap.* alt.git/objects/pack/ &&
 115         rm -f .git/objects/pack/multi-pack-index &&
 116         test_when_finished "mv alt.git/objects/pack/$packbitmap.* .git/objects/pack/" &&
 117         echo HEAD | git pack-objects --local --stdout --revs >3b.pack &&
 118         git index-pack 3b.pack &&
 119         list_packed_objects 3b.idx >3b.objects &&
 120         ! has_any packbitmap.objects 3b.objects
 121 '
 122
 123 test_expect_success 'pack-objects to file can use bitmap' '
 124         # make sure we still have 1 bitmap index from previous tests
 125         ls .git/objects/pack/ | grep bitmap >output &&
 126         test_line_count = 1 output &&
 127         # verify equivalent packs are generated with/without using bitmap index
 128         packasha1=$(git pack-objects --no-use-bitmap-index --all packa </dev/null) &&
 129         packbsha1=$(git pack-objects --use-bitmap-index --all packb </dev/null) &&
 130         list_packed_objects packa-$packasha1.idx >packa.objects &&
 131         list_packed_objects packb-$packbsha1.idx >packb.objects &&
 132         test_cmp packa.objects packb.objects
 133 '
 134
 135 test_expect_success 'full repack, reusing previous bitmaps' '
 136         git repack -ad &&
 137         ls .git/objects/pack/ | grep bitmap >output &&
 138         test_line_count = 1 output
 139 '
 140
 141 test_expect_success 'fetch (full bitmap)' '
 142         git --git-dir=clone.git fetch origin second:second &&
 143         git rev-parse HEAD >expect &&
 144         git --git-dir=clone.git rev-parse HEAD >actual &&
 145         test_cmp expect actual
 146 '
 147
 148 test_expect_success 'create objects for missing-HAVE tests' '
 149         blob=$(echo "missing have" | git hash-object -w --stdin) &&
 150         tree=$(printf "100644 blob $blob\tfile\n" | git mktree) &&
 151         parent=$(echo parent | git commit-tree $tree) &&
 152         commit=$(echo commit | git commit-tree $tree -p $parent) &&
 153         cat >revs <<-EOF
 154         HEAD
 155         ^HEAD^
 156         ^$commit
 157         EOF
 158 '
 159
 160 test_expect_success 'pack-objects respects --incremental' '
 161         cat >revs2 <<-EOF &&
 162         HEAD
 163         $commit
 164         EOF
 165         git pack-objects --incremental --stdout --revs <revs2 >4.pack &&
 166         git index-pack 4.pack &&
 167         list_packed_objects 4.idx >4.objects &&
 168         test_line_count = 4 4.objects &&
 169         git rev-list --objects $commit >revlist &&
 170         cut -d" " -f1 revlist |sort >objects &&
 171         test_cmp 4.objects objects
 172 '
 173
 174 test_expect_success 'pack with missing blob' '
 175         rm $(objpath $blob) &&
 176         git pack-objects --stdout --revs <revs >/dev/null
 177 '
 178
 179 test_expect_success 'pack with missing tree' '
 180         rm $(objpath $tree) &&
 181         git pack-objects --stdout --revs <revs >/dev/null
 182 '
 183
 184 test_expect_success 'pack with missing parent' '
 185         rm $(objpath $parent) &&
 186         git pack-objects --stdout --revs <revs >/dev/null
 187 '
 188
 189 test_expect_success JGIT,SHA1 'we can read jgit bitmaps' '
 190         git clone --bare . compat-jgit.git &&
 191         (
 192                 cd compat-jgit.git &&
 193                 rm -f objects/pack/*.bitmap &&
 194                 jgit gc &&
 195                 git rev-list --test-bitmap HEAD
 196         )
 197 '
 198
 199 test_expect_success JGIT,SHA1 'jgit can read our bitmaps' '
 200         git clone --bare . compat-us.git &&
 201         (
 202                 cd compat-us.git &&
 203                 git repack -adb &&
 204                 # jgit gc will barf if it does not like our bitmaps
 205                 jgit gc
 206         )
 207 '
 208
 209 test_expect_success 'splitting packs does not generate bogus bitmaps' '
 210         test-tool genrandom foo $((1024 * 1024)) >rand &&
 211         git add rand &&
 212         git commit -m "commit with big file" &&
 213         git -c pack.packSizeLimit=500k repack -adb &&
 214         git init --bare no-bitmaps.git &&
 215         git -C no-bitmaps.git fetch .. HEAD
 216 '
 217
 218 test_expect_success 'set up reusable pack' '
 219         rm -f .git/objects/pack/*.keep &&
 220         git repack -adb &&
 221         reusable_pack () {
 222                 git for-each-ref --format="%(objectname)" |
 223                 git pack-objects --delta-base-offset --revs --stdout "$@"
 224         }
 225 '
 226
 227 test_expect_success 'pack reuse respects --honor-pack-keep' '
 228         test_when_finished "rm -f .git/objects/pack/*.keep" &&
 229         for i in .git/objects/pack/*.pack
 230         do
 231                 >${i%.pack}.keep || return 1
 232         done &&
 233         reusable_pack --honor-pack-keep >empty.pack &&
 234         git index-pack empty.pack &&
 235         git show-index <empty.idx >actual &&
 236         test_must_be_empty actual
 237 '
 238
 239 test_expect_success 'pack reuse respects --local' '
 240         mv .git/objects/pack/* alt.git/objects/pack/ &&
 241         test_when_finished "mv alt.git/objects/pack/* .git/objects/pack/" &&
 242         reusable_pack --local >empty.pack &&
 243         git index-pack empty.pack &&
 244         git show-index <empty.idx >actual &&
 245         test_must_be_empty actual
 246 '
 247
 248 test_expect_success 'pack reuse respects --incremental' '
 249         reusable_pack --incremental >empty.pack &&
 250         git index-pack empty.pack &&
 251         git show-index <empty.idx >actual &&
 252         test_must_be_empty actual
 253 '
 254
 255 test_expect_success 'truncated bitmap fails gracefully (ewah)' '
 256         test_config pack.writebitmaphashcache false &&
 257         git repack -ad &&
 258         git rev-list --use-bitmap-index --count --all >expect &&
 259         bitmap=$(ls .git/objects/pack/*.bitmap) &&
 260         test_when_finished "rm -f $bitmap" &&
 261         test_copy_bytes 256 <$bitmap >$bitmap.tmp &&
 262         mv -f $bitmap.tmp $bitmap &&
 263         git rev-list --use-bitmap-index --count --all >actual 2>stderr &&
 264         test_cmp expect actual &&
 265         test_i18ngrep corrupt.ewah.bitmap stderr
 266 '
 267
 268 test_expect_success 'truncated bitmap fails gracefully (cache)' '
 269         git repack -ad &&
 270         git rev-list --use-bitmap-index --count --all >expect &&
 271         bitmap=$(ls .git/objects/pack/*.bitmap) &&
 272         test_when_finished "rm -f $bitmap" &&
 273         test_copy_bytes 512 <$bitmap >$bitmap.tmp &&
 274         mv -f $bitmap.tmp $bitmap &&
 275         git rev-list --use-bitmap-index --count --all >actual 2>stderr &&
 276         test_cmp expect actual &&
 277         test_i18ngrep corrupted.bitmap.index stderr
 278 '
 279
 280 # Create a state of history with these properties:
 281 #
 282 #  - refs that allow a client to fetch some new history, while sharing some old
 283 #    history with the server; we use branches delta-reuse-old and
 284 #    delta-reuse-new here
 285 #
 286 #  - the new history contains an object that is stored on the server as a delta
 287 #    against a base that is in the old history
 288 #
 289 #  - the base object is not immediately reachable from the tip of the old
 290 #    history; finding it would involve digging down through history we know the
 291 #    other side has
 292 #
 293 # This should result in a state where fetching from old->new would not
 294 # traditionally reuse the on-disk delta (because we'd have to dig to realize
 295 # that the client has it), but we will do so if bitmaps can tell us cheaply
 296 # that the other side has it.
 297 test_expect_success 'set up thin delta-reuse parent' '
 298         # This first commit contains the buried base object.
 299         test-tool genrandom delta 16384 >file &&
 300         git add file &&
 301         git commit -m "delta base" &&
 302         base=$(git rev-parse --verify HEAD:file) &&
 303
 304         # These intermediate commits bury the base back in history.
 305         # This becomes the "old" state.
 306         for i in 1 2 3 4 5
 307         do
 308                 echo $i >file &&
 309                 git commit -am "intermediate $i" || return 1
 310         done &&
 311         git branch delta-reuse-old &&
 312
 313         # And now our new history has a delta against the buried base. Note
 314         # that this must be smaller than the original file, since pack-objects
 315         # prefers to create deltas from smaller objects to larger.
 316         test-tool genrandom delta 16300 >file &&
 317         git commit -am "delta result" &&
 318         delta=$(git rev-parse --verify HEAD:file) &&
 319         git branch delta-reuse-new &&
 320
 321         # Repack with bitmaps and double check that we have the expected delta
 322         # relationship.
 323         git repack -adb &&
 324         have_delta $delta $base
 325 '
 326
 327 # Now we can sanity-check the non-bitmap behavior (that the server is not able
 328 # to reuse the delta). This isn't strictly something we care about, so this
 329 # test could be scrapped in the future. But it makes sure that the next test is
 330 # actually triggering the feature we want.
 331 #
 332 # Note that our tools for working with on-the-wire "thin" packs are limited. So
 333 # we actually perform the fetch, retain the resulting pack, and inspect the
 334 # result.
 335 test_expect_success 'fetch without bitmaps ignores delta against old base' '
 336         test_config pack.usebitmaps false &&
 337         test_when_finished "rm -rf client.git" &&
 338         git init --bare client.git &&
 339         (
 340                 cd client.git &&
 341                 git config transfer.unpackLimit 1 &&
 342                 git fetch .. delta-reuse-old:delta-reuse-old &&
 343                 git fetch .. delta-reuse-new:delta-reuse-new &&
 344                 have_delta $delta $ZERO_OID
 345         )
 346 '
 347
 348 # And do the same for the bitmap case, where we do expect to find the delta.
 349 test_expect_success 'fetch with bitmaps can reuse old base' '
 350         test_config pack.usebitmaps true &&
 351         test_when_finished "rm -rf client.git" &&
 352         git init --bare client.git &&
 353         (
 354                 cd client.git &&
 355                 git config transfer.unpackLimit 1 &&
 356                 git fetch .. delta-reuse-old:delta-reuse-old &&
 357                 git fetch .. delta-reuse-new:delta-reuse-new &&
 358                 have_delta $delta $base
 359         )
 360 '
 361
 362 test_expect_success 'pack.preferBitmapTips' '
 363         git init repo &&
 364         test_when_finished "rm -fr repo" &&
 365         (
 366                 cd repo &&
 367
 368                 # create enough commits that not all are receive bitmap
 369                 # coverage even if they are all at the tip of some reference.
 370                 test_commit_bulk --message="%s" 103 &&
 371
 372                 git rev-list HEAD >commits.raw &&
 373                 sort <commits.raw >commits &&
 374
 375                 git log --format="create refs/tags/%s %H" HEAD >refs &&
 376                 git update-ref --stdin <refs &&
 377
 378                 git repack -adb &&
 379                 test-tool bitmap list-commits | sort >bitmaps &&
 380
 381                 # remember which commits did not receive bitmaps
 382                 comm -13 bitmaps commits >before &&
 383                 test_file_not_empty before &&
 384
 385                 # mark the commits which did not receive bitmaps as preferred,
 386                 # and generate the bitmap again
 387                 perl -pe "s{^}{create refs/tags/include/$. }" <before |
 388                         git update-ref --stdin &&
 389                 git -c pack.preferBitmapTips=refs/tags/include repack -adb &&
 390
 391                 # finally, check that the commit(s) without bitmap coverage
 392                 # are not the same ones as before
 393                 test-tool bitmap list-commits | sort >bitmaps &&
 394                 comm -13 bitmaps commits >after &&
 395
 396                 ! test_cmp before after
 397         )
 398 '
 399
 400 test_done