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