t/t5616-partial-clone.sh

   1 #!/bin/sh
   2
   3 test_description='git partial clone'
   4
   5 GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
   6 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
   7
   8 . ./test-lib.sh
   9
  10 # create a normal "src" repo where we can later create new commits.
  11 # expect_1.oids will contain a list of the OIDs of all blobs.
  12 test_expect_success 'setup normal src repo' '
  13         echo "{print \$1}" >print_1.awk &&
  14         echo "{print \$2}" >print_2.awk &&
  15
  16         git init src &&
  17         for n in 1 2 3 4
  18         do
  19                 echo "This is file: $n" > src/file.$n.txt
  20                 git -C src add file.$n.txt
  21                 git -C src commit -m "file $n"
  22                 git -C src ls-files -s file.$n.txt >>temp
  23         done &&
  24         awk -f print_2.awk <temp | sort >expect_1.oids &&
  25         test_line_count = 4 expect_1.oids
  26 '
  27
  28 # bare clone "src" giving "srv.bare" for use as our server.
  29 test_expect_success 'setup bare clone for server' '
  30         git clone --bare "file://$(pwd)/src" srv.bare &&
  31         git -C srv.bare config --local uploadpack.allowfilter 1 &&
  32         git -C srv.bare config --local uploadpack.allowanysha1inwant 1
  33 '
  34
  35 # do basic partial clone from "srv.bare"
  36 # confirm we are missing all of the known blobs.
  37 # confirm partial clone was registered in the local config.
  38 test_expect_success 'do partial clone 1' '
  39         git clone --no-checkout --filter=blob:none "file://$(pwd)/srv.bare" pc1 &&
  40
  41         git -C pc1 rev-list --quiet --objects --missing=print HEAD >revs &&
  42         awk -f print_1.awk revs |
  43         sed "s/?//" |
  44         sort >observed.oids &&
  45
  46         test_cmp expect_1.oids observed.oids &&
  47         test "$(git -C pc1 config --local core.repositoryformatversion)" = "1" &&
  48         test "$(git -C pc1 config --local remote.origin.promisor)" = "true" &&
  49         test "$(git -C pc1 config --local remote.origin.partialclonefilter)" = "blob:none"
  50 '
  51
  52 test_expect_success 'verify that .promisor file contains refs fetched' '
  53         ls pc1/.git/objects/pack/pack-*.promisor >promisorlist &&
  54         test_line_count = 1 promisorlist &&
  55         git -C srv.bare rev-parse --verify HEAD >headhash &&
  56         grep "$(cat headhash) HEAD" $(cat promisorlist) &&
  57         grep "$(cat headhash) refs/heads/main" $(cat promisorlist)
  58 '
  59
  60 # checkout main to force dynamic object fetch of blobs at HEAD.
  61 test_expect_success 'verify checkout with dynamic object fetch' '
  62         git -C pc1 rev-list --quiet --objects --missing=print HEAD >observed &&
  63         test_line_count = 4 observed &&
  64         git -C pc1 checkout main &&
  65         git -C pc1 rev-list --quiet --objects --missing=print HEAD >observed &&
  66         test_line_count = 0 observed
  67 '
  68
  69 # create new commits in "src" repo to establish a blame history on file.1.txt
  70 # and push to "srv.bare".
  71 test_expect_success 'push new commits to server' '
  72         git -C src remote add srv "file://$(pwd)/srv.bare" &&
  73         for x in a b c d e
  74         do
  75                 echo "Mod file.1.txt $x" >>src/file.1.txt
  76                 git -C src add file.1.txt
  77                 git -C src commit -m "mod $x"
  78         done &&
  79         git -C src blame main -- file.1.txt >expect.blame &&
  80         git -C src push -u srv main
  81 '
  82
  83 # (partial) fetch in the partial clone repo from the promisor remote.
  84 # verify that fetch inherited the filter-spec from the config and DOES NOT
  85 # have the new blobs.
  86 test_expect_success 'partial fetch inherits filter settings' '
  87         git -C pc1 fetch origin &&
  88         git -C pc1 rev-list --quiet --objects --missing=print \
  89                 main..origin/main >observed &&
  90         test_line_count = 5 observed
  91 '
  92
  93 # force dynamic object fetch using diff.
  94 # we should only get 1 new blob (for the file in origin/main).
  95 test_expect_success 'verify diff causes dynamic object fetch' '
  96         git -C pc1 diff main..origin/main -- file.1.txt &&
  97         git -C pc1 rev-list --quiet --objects --missing=print \
  98                  main..origin/main >observed &&
  99         test_line_count = 4 observed
 100 '
 101
 102 # force full dynamic object fetch of the file's history using blame.
 103 # we should get the intermediate blobs for the file.
 104 test_expect_success 'verify blame causes dynamic object fetch' '
 105         git -C pc1 blame origin/main -- file.1.txt >observed.blame &&
 106         test_cmp expect.blame observed.blame &&
 107         git -C pc1 rev-list --quiet --objects --missing=print \
 108                 main..origin/main >observed &&
 109         test_line_count = 0 observed
 110 '
 111
 112 # create new commits in "src" repo to establish a history on file.2.txt
 113 # and push to "srv.bare".
 114 test_expect_success 'push new commits to server for file.2.txt' '
 115         for x in a b c d e f
 116         do
 117                 echo "Mod file.2.txt $x" >>src/file.2.txt
 118                 git -C src add file.2.txt
 119                 git -C src commit -m "mod $x"
 120         done &&
 121         git -C src push -u srv main
 122 '
 123
 124 # Do FULL fetch by disabling inherited filter-spec using --no-filter.
 125 # Verify we have all the new blobs.
 126 test_expect_success 'override inherited filter-spec using --no-filter' '
 127         git -C pc1 fetch --no-filter origin &&
 128         git -C pc1 rev-list --quiet --objects --missing=print \
 129                 main..origin/main >observed &&
 130         test_line_count = 0 observed
 131 '
 132
 133 # create new commits in "src" repo to establish a history on file.3.txt
 134 # and push to "srv.bare".
 135 test_expect_success 'push new commits to server for file.3.txt' '
 136         for x in a b c d e f
 137         do
 138                 echo "Mod file.3.txt $x" >>src/file.3.txt
 139                 git -C src add file.3.txt
 140                 git -C src commit -m "mod $x"
 141         done &&
 142         git -C src push -u srv main
 143 '
 144
 145 # Do a partial fetch and then try to manually fetch the missing objects.
 146 # This can be used as the basis of a pre-command hook to bulk fetch objects
 147 # perhaps combined with a command in dry-run mode.
 148 test_expect_success 'manual prefetch of missing objects' '
 149         git -C pc1 fetch --filter=blob:none origin &&
 150
 151         git -C pc1 rev-list --quiet --objects --missing=print \
 152                  main..origin/main >revs &&
 153         awk -f print_1.awk revs |
 154         sed "s/?//" |
 155         sort >observed.oids &&
 156
 157         test_line_count = 6 observed.oids &&
 158         git -C pc1 fetch-pack --stdin "file://$(pwd)/srv.bare" <observed.oids &&
 159
 160         git -C pc1 rev-list --quiet --objects --missing=print \
 161                 main..origin/main >revs &&
 162         awk -f print_1.awk revs |
 163         sed "s/?//" |
 164         sort >observed.oids &&
 165
 166         test_line_count = 0 observed.oids
 167 '
 168
 169 test_expect_success 'partial clone with transfer.fsckobjects=1 works with submodules' '
 170         test_create_repo submodule &&
 171         test_commit -C submodule mycommit &&
 172
 173         test_create_repo src_with_sub &&
 174         test_config -C src_with_sub uploadpack.allowfilter 1 &&
 175         test_config -C src_with_sub uploadpack.allowanysha1inwant 1 &&
 176
 177         git -C src_with_sub submodule add "file://$(pwd)/submodule" mysub &&
 178         git -C src_with_sub commit -m "commit with submodule" &&
 179
 180         git -c transfer.fsckobjects=1 \
 181                 clone --filter="blob:none" "file://$(pwd)/src_with_sub" dst &&
 182         test_when_finished rm -rf dst
 183 '
 184
 185 test_expect_success 'partial clone with transfer.fsckobjects=1 uses index-pack --fsck-objects' '
 186         git init src &&
 187         test_commit -C src x &&
 188         test_config -C src uploadpack.allowfilter 1 &&
 189         test_config -C src uploadpack.allowanysha1inwant 1 &&
 190
 191         GIT_TRACE="$(pwd)/trace" git -c transfer.fsckobjects=1 \
 192                 clone --filter="blob:none" "file://$(pwd)/src" dst &&
 193         grep "git index-pack.*--fsck-objects" trace
 194 '
 195
 196 test_expect_success 'use fsck before and after manually fetching a missing subtree' '
 197         # push new commit so server has a subtree
 198         mkdir src/dir &&
 199         echo "in dir" >src/dir/file.txt &&
 200         git -C src add dir/file.txt &&
 201         git -C src commit -m "file in dir" &&
 202         git -C src push -u srv main &&
 203         SUBTREE=$(git -C src rev-parse HEAD:dir) &&
 204
 205         rm -rf dst &&
 206         git clone --no-checkout --filter=tree:0 "file://$(pwd)/srv.bare" dst &&
 207         git -C dst fsck &&
 208
 209         # Make sure we only have commits, and all trees and blobs are missing.
 210         git -C dst rev-list --missing=allow-any --objects main \
 211                 >fetched_objects &&
 212         awk -f print_1.awk fetched_objects |
 213         xargs -n1 git -C dst cat-file -t >fetched_types &&
 214
 215         sort -u fetched_types >unique_types.observed &&
 216         echo commit >unique_types.expected &&
 217         test_cmp unique_types.expected unique_types.observed &&
 218
 219         # Auto-fetch a tree with cat-file.
 220         git -C dst cat-file -p $SUBTREE >tree_contents &&
 221         grep file.txt tree_contents &&
 222
 223         # fsck still works after an auto-fetch of a tree.
 224         git -C dst fsck &&
 225
 226         # Auto-fetch all remaining trees and blobs with --missing=error
 227         git -C dst rev-list --missing=error --objects main >fetched_objects &&
 228         test_line_count = 70 fetched_objects &&
 229
 230         awk -f print_1.awk fetched_objects |
 231         xargs -n1 git -C dst cat-file -t >fetched_types &&
 232
 233         sort -u fetched_types >unique_types.observed &&
 234         test_write_lines blob commit tree >unique_types.expected &&
 235         test_cmp unique_types.expected unique_types.observed
 236 '
 237
 238 test_expect_success 'implicitly construct combine: filter with repeated flags' '
 239         GIT_TRACE=$(pwd)/trace git clone --bare \
 240                 --filter=blob:none --filter=tree:1 \
 241                 "file://$(pwd)/srv.bare" pc2 &&
 242         grep "trace:.* git pack-objects .*--filter=combine:blob:none+tree:1" \
 243                 trace &&
 244         git -C pc2 rev-list --objects --missing=allow-any HEAD >objects &&
 245
 246         # We should have gotten some root trees.
 247         grep " $" objects &&
 248         # Should not have gotten any non-root trees or blobs.
 249         ! grep " ." objects &&
 250
 251         xargs -n 1 git -C pc2 cat-file -t <objects >types &&
 252         sort -u types >unique_types.actual &&
 253         test_write_lines commit tree >unique_types.expected &&
 254         test_cmp unique_types.expected unique_types.actual
 255 '
 256
 257 test_expect_success 'upload-pack complains of bogus filter config' '
 258         printf 0000 |
 259         test_must_fail git \
 260                 -c uploadpackfilter.tree.maxdepth \
 261                 upload-pack . >/dev/null 2>err &&
 262         test_i18ngrep "unable to parse.*tree.maxdepth" err
 263 '
 264
 265 test_expect_success 'upload-pack fails banned object filters' '
 266         test_config -C srv.bare uploadpackfilter.blob:none.allow false &&
 267         test_must_fail ok=sigpipe git clone --no-checkout --filter=blob:none \
 268                 "file://$(pwd)/srv.bare" pc3 2>err &&
 269         test_i18ngrep "filter '\''blob:none'\'' not supported" err
 270 '
 271
 272 test_expect_success 'upload-pack fails banned combine object filters' '
 273         test_config -C srv.bare uploadpackfilter.allow false &&
 274         test_config -C srv.bare uploadpackfilter.combine.allow true &&
 275         test_config -C srv.bare uploadpackfilter.tree.allow true &&
 276         test_config -C srv.bare uploadpackfilter.blob:none.allow false &&
 277         test_must_fail ok=sigpipe git clone --no-checkout --filter=tree:1 \
 278                 --filter=blob:none "file://$(pwd)/srv.bare" pc3 2>err &&
 279         test_i18ngrep "filter '\''blob:none'\'' not supported" err
 280 '
 281
 282 test_expect_success 'upload-pack fails banned object filters with fallback' '
 283         test_config -C srv.bare uploadpackfilter.allow false &&
 284         test_must_fail ok=sigpipe git clone --no-checkout --filter=blob:none \
 285                 "file://$(pwd)/srv.bare" pc3 2>err &&
 286         test_i18ngrep "filter '\''blob:none'\'' not supported" err
 287 '
 288
 289 test_expect_success 'upload-pack limits tree depth filters' '
 290         test_config -C srv.bare uploadpackfilter.allow false &&
 291         test_config -C srv.bare uploadpackfilter.tree.allow true &&
 292         test_config -C srv.bare uploadpackfilter.tree.maxDepth 0 &&
 293         test_must_fail ok=sigpipe git clone --no-checkout --filter=tree:1 \
 294                 "file://$(pwd)/srv.bare" pc3 2>err &&
 295         test_i18ngrep "tree filter allows max depth 0, but got 1" err &&
 296
 297         git clone --no-checkout --filter=tree:0 "file://$(pwd)/srv.bare" pc4 &&
 298
 299         test_config -C srv.bare uploadpackfilter.tree.maxDepth 5 &&
 300         git clone --no-checkout --filter=tree:5 "file://$(pwd)/srv.bare" pc5 &&
 301         test_must_fail ok=sigpipe git clone --no-checkout --filter=tree:6 \
 302                 "file://$(pwd)/srv.bare" pc6 2>err &&
 303         test_i18ngrep "tree filter allows max depth 5, but got 6" err
 304 '
 305
 306 test_expect_success 'partial clone fetches blobs pointed to by refs even if normally filtered out' '
 307         rm -rf src dst &&
 308         git init src &&
 309         test_commit -C src x &&
 310         test_config -C src uploadpack.allowfilter 1 &&
 311         test_config -C src uploadpack.allowanysha1inwant 1 &&
 312
 313         # Create a tag pointing to a blob.
 314         BLOB=$(echo blob-contents | git -C src hash-object --stdin -w) &&
 315         git -C src tag myblob "$BLOB" &&
 316
 317         git clone --filter="blob:none" "file://$(pwd)/src" dst 2>err &&
 318         ! grep "does not point to a valid object" err &&
 319         git -C dst fsck
 320 '
 321
 322 test_expect_success 'fetch what is specified on CLI even if already promised' '
 323         rm -rf src dst.git &&
 324         git init src &&
 325         test_commit -C src foo &&
 326         test_config -C src uploadpack.allowfilter 1 &&
 327         test_config -C src uploadpack.allowanysha1inwant 1 &&
 328
 329         git hash-object --stdin <src/foo.t >blob &&
 330
 331         git clone --bare --filter=blob:none "file://$(pwd)/src" dst.git &&
 332         git -C dst.git rev-list --objects --quiet --missing=print HEAD >missing_before &&
 333         grep "?$(cat blob)" missing_before &&
 334         git -C dst.git fetch origin $(cat blob) &&
 335         git -C dst.git rev-list --objects --quiet --missing=print HEAD >missing_after &&
 336         ! grep "?$(cat blob)" missing_after
 337 '
 338
 339 test_expect_success 'setup src repo for sparse filter' '
 340         git init sparse-src &&
 341         git -C sparse-src config --local uploadpack.allowfilter 1 &&
 342         git -C sparse-src config --local uploadpack.allowanysha1inwant 1 &&
 343         test_commit -C sparse-src one &&
 344         test_commit -C sparse-src two &&
 345         echo /one.t >sparse-src/only-one &&
 346         git -C sparse-src add . &&
 347         git -C sparse-src commit -m "add sparse checkout files"
 348 '
 349
 350 test_expect_success 'partial clone with sparse filter succeeds' '
 351         rm -rf dst.git &&
 352         git clone --no-local --bare \
 353                   --filter=sparse:oid=main:only-one \
 354                   sparse-src dst.git &&
 355         (
 356                 cd dst.git &&
 357                 git rev-list --objects --missing=print HEAD >out &&
 358                 grep "^$(git rev-parse HEAD:one.t)" out &&
 359                 grep "^?$(git rev-parse HEAD:two.t)" out
 360         )
 361 '
 362
 363 test_expect_success 'partial clone with unresolvable sparse filter fails cleanly' '
 364         rm -rf dst.git &&
 365         test_must_fail git clone --no-local --bare \
 366                                  --filter=sparse:oid=main:no-such-name \
 367                                  sparse-src dst.git 2>err &&
 368         test_i18ngrep "unable to access sparse blob in .main:no-such-name" err &&
 369         test_must_fail git clone --no-local --bare \
 370                                  --filter=sparse:oid=main \
 371                                  sparse-src dst.git 2>err &&
 372         test_i18ngrep "unable to parse sparse filter data in" err
 373 '
 374
 375 setup_triangle () {
 376         rm -rf big-blob.txt server client promisor-remote &&
 377
 378         printf "line %d\n" $(test_seq 1 100) >big-blob.txt &&
 379
 380         # Create a server with 2 commits: a commit with a big tree and a child
 381         # commit with an incremental change. Also, create a partial clone
 382         # client that only contains the first commit.
 383         git init server &&
 384         git -C server config --local uploadpack.allowfilter 1 &&
 385         for i in $(test_seq 1 100)
 386         do
 387                 echo "make the tree big" >server/file$i &&
 388                 git -C server add file$i
 389         done &&
 390         git -C server commit -m "initial" &&
 391         git clone --bare --filter=tree:0 "file://$(pwd)/server" client &&
 392         echo another line >>server/file1 &&
 393         git -C server commit -am "incremental change" &&
 394
 395         # Create a promisor remote that only contains the tree and blob from
 396         # the first commit.
 397         git init promisor-remote &&
 398         git -C server config --local uploadpack.allowanysha1inwant 1 &&
 399         TREE_HASH=$(git -C server rev-parse HEAD~1^{tree}) &&
 400         git -C promisor-remote fetch --keep "file://$(pwd)/server" "$TREE_HASH" &&
 401         git -C promisor-remote count-objects -v >object-count &&
 402         test_i18ngrep "count: 0" object-count &&
 403         test_i18ngrep "in-pack: 2" object-count &&
 404
 405         # Set it as the promisor remote of client. Thus, whenever
 406         # the client lazy fetches, the lazy fetch will succeed only if it is
 407         # for this tree or blob.
 408         test_commit -C promisor-remote one && # so that ref advertisement is not empty
 409         git -C promisor-remote config --local uploadpack.allowanysha1inwant 1 &&
 410         git -C client remote set-url origin "file://$(pwd)/promisor-remote"
 411 }
 412
 413 # NEEDSWORK: The tests beginning with "fetch lazy-fetches" below only
 414 # test that "fetch" avoid fetching trees and blobs, but not commits or
 415 # tags. Revisit this if Git is ever taught to support partial clones
 416 # with commits and/or tags filtered out.
 417
 418 test_expect_success 'fetch lazy-fetches only to resolve deltas' '
 419         setup_triangle &&
 420
 421         # Exercise to make sure it works. Git will not fetch anything from the
 422         # promisor remote other than for the big tree (because it needs to
 423         # resolve the delta).
 424         GIT_TRACE_PACKET="$(pwd)/trace" git -C client \
 425                 fetch "file://$(pwd)/server" main &&
 426
 427         # Verify the assumption that the client needed to fetch the delta base
 428         # to resolve the delta.
 429         git -C server rev-parse HEAD~1^{tree} >hash &&
 430         grep "want $(cat hash)" trace
 431 '
 432
 433 test_expect_success 'fetch lazy-fetches only to resolve deltas, protocol v2' '
 434         setup_triangle &&
 435
 436         git -C server config --local protocol.version 2 &&
 437         git -C client config --local protocol.version 2 &&
 438         git -C promisor-remote config --local protocol.version 2 &&
 439
 440         # Exercise to make sure it works. Git will not fetch anything from the
 441         # promisor remote other than for the big blob (because it needs to
 442         # resolve the delta).
 443         GIT_TRACE_PACKET="$(pwd)/trace" git -C client \
 444                 fetch "file://$(pwd)/server" main &&
 445
 446         # Verify that protocol version 2 was used.
 447         grep "fetch< version 2" trace &&
 448
 449         # Verify the assumption that the client needed to fetch the delta base
 450         # to resolve the delta.
 451         git -C server rev-parse HEAD~1^{tree} >hash &&
 452         grep "want $(cat hash)" trace
 453 '
 454
 455 test_expect_success 'fetch does not lazy-fetch missing targets of its refs' '
 456         rm -rf server client trace &&
 457
 458         test_create_repo server &&
 459         test_config -C server uploadpack.allowfilter 1 &&
 460         test_config -C server uploadpack.allowanysha1inwant 1 &&
 461         test_commit -C server foo &&
 462
 463         git clone --filter=blob:none "file://$(pwd)/server" client &&
 464         # Make all refs point to nothing by deleting all objects.
 465         rm client/.git/objects/pack/* &&
 466
 467         test_commit -C server bar &&
 468         GIT_TRACE_PACKET="$(pwd)/trace" git -C client fetch \
 469                 --no-tags --recurse-submodules=no \
 470                 origin refs/tags/bar &&
 471         FOO_HASH=$(git -C server rev-parse foo) &&
 472         ! grep "want $FOO_HASH" trace
 473 '
 474
 475 # The following two tests must be in this order. It is important that
 476 # the srv.bare repository did not have tags during clone, but has tags
 477 # in the fetch.
 478
 479 test_expect_success 'verify fetch succeeds when asking for new tags' '
 480         git clone --filter=blob:none "file://$(pwd)/srv.bare" tag-test &&
 481         for i in I J K
 482         do
 483                 test_commit -C src $i &&
 484                 git -C src branch $i || return 1
 485         done &&
 486         git -C srv.bare fetch --tags origin +refs/heads/*:refs/heads/* &&
 487         git -C tag-test -c protocol.version=2 fetch --tags origin
 488 '
 489
 490 test_expect_success 'verify fetch downloads only one pack when updating refs' '
 491         git clone --filter=blob:none "file://$(pwd)/srv.bare" pack-test &&
 492         ls pack-test/.git/objects/pack/*pack >pack-list &&
 493         test_line_count = 2 pack-list &&
 494         for i in A B C
 495         do
 496                 test_commit -C src $i &&
 497                 git -C src branch $i || return 1
 498         done &&
 499         git -C srv.bare fetch origin +refs/heads/*:refs/heads/* &&
 500         git -C pack-test fetch origin &&
 501         ls pack-test/.git/objects/pack/*pack >pack-list &&
 502         test_line_count = 3 pack-list
 503 '
 504
 505 test_expect_success 'single-branch tag following respects partial clone' '
 506         git clone --single-branch -b B --filter=blob:none \
 507                 "file://$(pwd)/srv.bare" single &&
 508         git -C single rev-parse --verify refs/tags/B &&
 509         git -C single rev-parse --verify refs/tags/A &&
 510         test_must_fail git -C single rev-parse --verify refs/tags/C
 511 '
 512
 513 test_expect_success 'fetch from a partial clone, protocol v0' '
 514         rm -rf server client trace &&
 515
 516         # Pretend that the server is a partial clone
 517         git init server &&
 518         git -C server remote add a_remote "file://$(pwd)/" &&
 519         test_config -C server core.repositoryformatversion 1 &&
 520         test_config -C server extensions.partialclone a_remote &&
 521         test_config -C server protocol.version 0 &&
 522         test_commit -C server foo &&
 523
 524         # Fetch from the server
 525         git init client &&
 526         test_config -C client protocol.version 0 &&
 527         test_commit -C client bar &&
 528         GIT_TRACE_PACKET="$(pwd)/trace" git -C client fetch "file://$(pwd)/server" &&
 529         ! grep "version 2" trace
 530 '
 531
 532 test_expect_success 'fetch from a partial clone, protocol v2' '
 533         rm -rf server client trace &&
 534
 535         # Pretend that the server is a partial clone
 536         git init server &&
 537         git -C server remote add a_remote "file://$(pwd)/" &&
 538         test_config -C server core.repositoryformatversion 1 &&
 539         test_config -C server extensions.partialclone a_remote &&
 540         test_config -C server protocol.version 2 &&
 541         test_commit -C server foo &&
 542
 543         # Fetch from the server
 544         git init client &&
 545         test_config -C client protocol.version 2 &&
 546         test_commit -C client bar &&
 547         GIT_TRACE_PACKET="$(pwd)/trace" git -C client fetch "file://$(pwd)/server" &&
 548         grep "version 2" trace
 549 '
 550
 551 . "$TEST_DIRECTORY"/lib-httpd.sh
 552 start_httpd
 553
 554 # Converts bytes into their hexadecimal representation. For example,
 555 # "printf 'ab\r\n' | hex_unpack" results in '61620d0a'.
 556 hex_unpack () {
 557         perl -e '$/ = undef; $input = <>; print unpack("H2" x length($input), $input)'
 558 }
 559
 560 # Inserts $1 at the start of the string and every 2 characters thereafter.
 561 intersperse () {
 562         sed 's/\(..\)/'$1'\1/g'
 563 }
 564
 565 # Create a one-time-perl command to replace the existing packfile with $1.
 566 replace_packfile () {
 567         # The protocol requires that the packfile be sent in sideband 1, hence
 568         # the extra \x01 byte at the beginning.
 569         cp $1 "$HTTPD_ROOT_PATH/one-time-pack" &&
 570         echo 'if (/packfile/) {
 571                 print;
 572                 my $length = -s "one-time-pack";
 573                 printf "%04x\x01", $length + 5;
 574                 print `cat one-time-pack` . "0000";
 575                 last
 576         }' >"$HTTPD_ROOT_PATH/one-time-perl"
 577 }
 578
 579 test_expect_success 'upon cloning, check that all refs point to objects' '
 580         SERVER="$HTTPD_DOCUMENT_ROOT_PATH/server" &&
 581         rm -rf "$SERVER" repo &&
 582         test_create_repo "$SERVER" &&
 583         test_commit -C "$SERVER" foo &&
 584         test_config -C "$SERVER" uploadpack.allowfilter 1 &&
 585         test_config -C "$SERVER" uploadpack.allowanysha1inwant 1 &&
 586
 587         # Create a tag pointing to a blob.
 588         BLOB=$(echo blob-contents | git -C "$SERVER" hash-object --stdin -w) &&
 589         git -C "$SERVER" tag myblob "$BLOB" &&
 590
 591         # Craft a packfile not including that blob.
 592         git -C "$SERVER" rev-parse HEAD |
 593         git -C "$SERVER" pack-objects --stdout >incomplete.pack &&
 594
 595         # Replace the existing packfile with the crafted one. The protocol
 596         # requires that the packfile be sent in sideband 1, hence the extra
 597         # \x01 byte at the beginning.
 598         replace_packfile incomplete.pack &&
 599
 600         # Use protocol v2 because the perl command looks for the "packfile"
 601         # section header.
 602         test_config -C "$SERVER" protocol.version 2 &&
 603         test_must_fail git -c protocol.version=2 clone \
 604                 --filter=blob:none $HTTPD_URL/one_time_perl/server repo 2>err &&
 605
 606         test_i18ngrep "did not send all necessary objects" err &&
 607
 608         # Ensure that the one-time-perl script was used.
 609         ! test -e "$HTTPD_ROOT_PATH/one-time-perl"
 610 '
 611
 612 test_expect_success 'when partial cloning, tolerate server not sending target of tag' '
 613         SERVER="$HTTPD_DOCUMENT_ROOT_PATH/server" &&
 614         rm -rf "$SERVER" repo &&
 615         test_create_repo "$SERVER" &&
 616         test_commit -C "$SERVER" foo &&
 617         test_config -C "$SERVER" uploadpack.allowfilter 1 &&
 618         test_config -C "$SERVER" uploadpack.allowanysha1inwant 1 &&
 619
 620         # Create an annotated tag pointing to a blob.
 621         BLOB=$(echo blob-contents | git -C "$SERVER" hash-object --stdin -w) &&
 622         git -C "$SERVER" tag -m message -a myblob "$BLOB" &&
 623
 624         # Craft a packfile including the tag, but not the blob it points to.
 625         # Also, omit objects referenced from HEAD in order to force a second
 626         # fetch (to fetch missing objects) upon the automatic checkout that
 627         # happens after a clone.
 628         printf "%s\n%s\n--not\n%s\n%s\n" \
 629                 $(git -C "$SERVER" rev-parse HEAD) \
 630                 $(git -C "$SERVER" rev-parse myblob) \
 631                 $(git -C "$SERVER" rev-parse HEAD^{tree}) \
 632                 $(git -C "$SERVER" rev-parse myblob^{blob}) |
 633                 git -C "$SERVER" pack-objects --thin --stdout >incomplete.pack &&
 634
 635         # Replace the existing packfile with the crafted one. The protocol
 636         # requires that the packfile be sent in sideband 1, hence the extra
 637         # \x01 byte at the beginning.
 638         replace_packfile incomplete.pack &&
 639
 640         # Use protocol v2 because the perl command looks for the "packfile"
 641         # section header.
 642         test_config -C "$SERVER" protocol.version 2 &&
 643
 644         # Exercise to make sure it works.
 645         git -c protocol.version=2 clone \
 646                 --filter=blob:none $HTTPD_URL/one_time_perl/server repo 2> err &&
 647         ! grep "missing object referenced by" err &&
 648
 649         # Ensure that the one-time-perl script was used.
 650         ! test -e "$HTTPD_ROOT_PATH/one-time-perl"
 651 '
 652
 653 test_expect_success 'tolerate server sending REF_DELTA against missing promisor objects' '
 654         SERVER="$HTTPD_DOCUMENT_ROOT_PATH/server" &&
 655         rm -rf "$SERVER" repo &&
 656         test_create_repo "$SERVER" &&
 657         test_config -C "$SERVER" uploadpack.allowfilter 1 &&
 658         test_config -C "$SERVER" uploadpack.allowanysha1inwant 1 &&
 659
 660         # Create a commit with 2 blobs to be used as delta bases.
 661         for i in $(test_seq 10)
 662         do
 663                 echo "this is a line" >>"$SERVER/foo.txt" &&
 664                 echo "this is another line" >>"$SERVER/have.txt"
 665         done &&
 666         git -C "$SERVER" add foo.txt have.txt &&
 667         git -C "$SERVER" commit -m bar &&
 668         git -C "$SERVER" rev-parse HEAD:foo.txt >deltabase_missing &&
 669         git -C "$SERVER" rev-parse HEAD:have.txt >deltabase_have &&
 670
 671         # Clone. The client has deltabase_have but not deltabase_missing.
 672         git -c protocol.version=2 clone --no-checkout \
 673                 --filter=blob:none $HTTPD_URL/one_time_perl/server repo &&
 674         git -C repo hash-object -w -- "$SERVER/have.txt" &&
 675
 676         # Sanity check to ensure that the client does not have
 677         # deltabase_missing.
 678         git -C repo rev-list --objects --ignore-missing \
 679                 -- $(cat deltabase_missing) >objlist &&
 680         test_line_count = 0 objlist &&
 681
 682         # Another commit. This commit will be fetched by the client.
 683         echo "abcdefghijklmnopqrstuvwxyz" >>"$SERVER/foo.txt" &&
 684         echo "abcdefghijklmnopqrstuvwxyz" >>"$SERVER/have.txt" &&
 685         git -C "$SERVER" add foo.txt have.txt &&
 686         git -C "$SERVER" commit -m baz &&
 687
 688         # Pack a thin pack containing, among other things, HEAD:foo.txt
 689         # delta-ed against HEAD^:foo.txt and HEAD:have.txt delta-ed against
 690         # HEAD^:have.txt.
 691         printf "%s\n--not\n%s\n" \
 692                 $(git -C "$SERVER" rev-parse HEAD) \
 693                 $(git -C "$SERVER" rev-parse HEAD^) |
 694                 git -C "$SERVER" pack-objects --thin --stdout >thin.pack &&
 695
 696         # Ensure that the pack contains one delta against HEAD^:foo.txt. Since
 697         # the delta contains at least 26 novel characters, the size cannot be
 698         # contained in 4 bits, so the object header will take up 2 bytes. The
 699         # most significant nybble of the first byte is 0b1111 (0b1 to indicate
 700         # that the header continues, and 0b111 to indicate REF_DELTA), followed
 701         # by any 3 nybbles, then the OID of the delta base.
 702         printf "f.,..%s" $(intersperse "," <deltabase_missing) >want &&
 703         hex_unpack <thin.pack | intersperse "," >have &&
 704         grep $(cat want) have &&
 705
 706         # Ensure that the pack contains one delta against HEAD^:have.txt,
 707         # similar to the above.
 708         printf "f.,..%s" $(intersperse "," <deltabase_have) >want &&
 709         hex_unpack <thin.pack | intersperse "," >have &&
 710         grep $(cat want) have &&
 711
 712         replace_packfile thin.pack &&
 713
 714         # Use protocol v2 because the perl command looks for the "packfile"
 715         # section header.
 716         test_config -C "$SERVER" protocol.version 2 &&
 717
 718         # Fetch the thin pack and ensure that index-pack is able to handle the
 719         # REF_DELTA object with a missing promisor delta base.
 720         GIT_TRACE_PACKET="$(pwd)/trace" git -C repo -c protocol.version=2 fetch &&
 721
 722         # Ensure that the missing delta base was directly fetched, but not the
 723         # one that the client has.
 724         grep "want $(cat deltabase_missing)" trace &&
 725         ! grep "want $(cat deltabase_have)" trace &&
 726
 727         # Ensure that the one-time-perl script was used.
 728         ! test -e "$HTTPD_ROOT_PATH/one-time-perl"
 729 '
 730
 731 # DO NOT add non-httpd-specific tests here, because the last part of this
 732 # test script is only executed when httpd is available and enabled.
 733
 734 test_done