t/t5616-partial-clone.sh

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