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+#!/bin/sh
+
+test_description='handling of duplicate objects in incoming packfiles'
+. ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-pack.sh
+
+# The sha1s we have in our pack. It's important that these have the same
+# starting byte, so that they end up in the same fanout section of the index.
+# That lets us make sure we are exercising the binary search with both sets.
+LO_SHA1=e68fe8129b546b101aee9510c5328e7f21ca1d18
+HI_SHA1=e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
+
+# And here's a "missing sha1" which will produce failed lookups. It must also
+# be in the same fanout section, and should be between the two (so that during
+# our binary search, we are sure to end up looking at one or the other of the
+# duplicate runs).
+MISSING_SHA1='e69d000000000000000000000000000000000000'
+
+# git will never intentionally create packfiles with
+# duplicate objects, so we have to construct them by hand.
+#
+# $1 is the name of the packfile to create
+#
+# $2 is the number of times to duplicate each object
+create_pack () {
+ pack_header "$((2 * $2))" >"$1" &&
+ for i in $(test_seq 1 "$2"); do
+ pack_obj $LO_SHA1 &&
+ pack_obj $HI_SHA1
+ done >>"$1" &&
+ pack_trailer "$1"
+}
+
+# double-check that create_pack actually works
+test_expect_success 'pack with no duplicates' '
+ create_pack no-dups.pack 1 &&
+ git index-pack --stdin <no-dups.pack
+'
+
+test_expect_success 'index-pack will allow duplicate objects by default' '
+ clear_packs &&
+ create_pack dups.pack 100 &&
+ git index-pack --stdin <dups.pack
+'
+
+test_expect_success 'create batch-check test vectors' '
+ cat >input <<-EOF &&
+ $LO_SHA1
+ $HI_SHA1
+ $MISSING_SHA1
+ EOF
+ cat >expect <<-EOF
+ $LO_SHA1 blob 2
+ $HI_SHA1 blob 0
+ $MISSING_SHA1 missing
+ EOF
+'
+
+test_expect_success 'lookup in duplicated pack (binary search)' '
+ git cat-file --batch-check <input >actual &&
+ test_cmp expect actual
+'
+
+test_expect_success 'lookup in duplicated pack (GIT_USE_LOOKUP)' '
+ (
+ GIT_USE_LOOKUP=1 &&
+ export GIT_USE_LOOKUP &&
+ git cat-file --batch-check <input >actual
+ ) &&
+ test_cmp expect actual
+'
+
+test_expect_success 'index-pack can reject packs with duplicates' '
+ clear_packs &&
+ create_pack dups.pack 2 &&
+ test_must_fail git index-pack --strict --stdin <dups.pack &&
+ test_expect_code 1 git cat-file -e $LO_SHA1
+'
+
+test_done