t/t5308-pack-detect-duplicates.sh

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