t/t5308-pack-detect-duplicates.sh

   1 #!/bin/sh
   2
   3 test_description='handling of duplicate objects in incoming packfiles'
   4
   5 TEST_PASSES_SANITIZE_LEAK=true
   6 . ./test-lib.sh
   7 . "$TEST_DIRECTORY"/lib-pack.sh
   8
   9 test_expect_success 'setup' '
  10         test_oid_cache <<-EOF
  11         lo_oid sha1:e68fe8129b546b101aee9510c5328e7f21ca1d18
  12         lo_oid sha256:471819e8c52bf11513f100b2810a8aa0622d5cd3d1c913758a071dd4b3bad8fe
  13
  14         missing_oid sha1:e69d000000000000000000000000000000000000
  15         missing_oid sha256:4720000000000000000000000000000000000000000000000000000000000000
  16         EOF
  17 '
  18
  19 # The sha1s we have in our pack. It's important that these have the same
  20 # starting byte, so that they end up in the same fanout section of the index.
  21 # That lets us make sure we are exercising the binary search with both sets.
  22 LO_SHA1=$(test_oid lo_oid)
  23 HI_SHA1=$EMPTY_BLOB
  24
  25 # And here's a "missing sha1" which will produce failed lookups. It must also
  26 # be in the same fanout section, and should be between the two (so that during
  27 # our binary search, we are sure to end up looking at one or the other of the
  28 # duplicate runs).
  29 MISSING_SHA1=$(test_oid missing_oid)
  30
  31 # git will never intentionally create packfiles with
  32 # duplicate objects, so we have to construct them by hand.
  33 #
  34 # $1 is the name of the packfile to create
  35 #
  36 # $2 is the number of times to duplicate each object
  37 create_pack () {
  38         pack_header "$((2 * $2))" >"$1" &&
  39         for i in $(test_seq 1 "$2"); do
  40                 pack_obj $LO_SHA1 &&
  41                 pack_obj $HI_SHA1
  42         done >>"$1" &&
  43         pack_trailer "$1"
  44 }
  45
  46 # double-check that create_pack actually works
  47 test_expect_success 'pack with no duplicates' '
  48         create_pack no-dups.pack 1 &&
  49         git index-pack --stdin <no-dups.pack
  50 '
  51
  52 test_expect_success 'index-pack will allow duplicate objects by default' '
  53         clear_packs &&
  54         create_pack dups.pack 100 &&
  55         git index-pack --stdin <dups.pack
  56 '
  57
  58 test_expect_success 'create batch-check test vectors' '
  59         cat >input <<-EOF &&
  60         $LO_SHA1
  61         $HI_SHA1
  62         $MISSING_SHA1
  63         EOF
  64         cat >expect <<-EOF
  65         $LO_SHA1 blob 2
  66         $HI_SHA1 blob 0
  67         $MISSING_SHA1 missing
  68         EOF
  69 '
  70
  71 test_expect_success 'lookup in duplicated pack' '
  72         git cat-file --batch-check <input >actual &&
  73         test_cmp expect actual
  74 '
  75
  76 test_expect_success 'index-pack can reject packs with duplicates' '
  77         clear_packs &&
  78         create_pack dups.pack 2 &&
  79         test_must_fail git index-pack --strict --stdin <dups.pack &&
  80         test_expect_code 1 git cat-file -e $LO_SHA1
  81 '
  82
  83 test_done