filter_ref: make a copy of extra "sought" entries

diff --git a/t/t0021-conversion.sh b/t/t0021-conversion.sh
index f890c54d137aab021e6d6a61c5741af872555c1f..ca7d2a630a8442d8812b444708d6f28f2e45fb32 100755 (executable)
--- a/t/t0021-conversion.sh
+++ b/t/t0021-conversion.sh
@@ -153,17 +153,23 @@ test_expect_success 'filter shell-escaped filenames' '
        :
 '
 
-test_expect_success 'required filter success' '
-       git config filter.required.smudge cat &&
-       git config filter.required.clean cat &&
+test_expect_success 'required filter should filter data' '
+       git config filter.required.smudge ./rot13.sh &&
+       git config filter.required.clean ./rot13.sh &&
        git config filter.required.required true &&
 
        echo "*.r filter=required" >.gitattributes &&
 
-       echo test >test.r &&
+       cat test.o >test.r &&
        git add test.r &&
+
        rm -f test.r &&
-       git checkout -- test.r
+       git checkout -- test.r &&
+       cmp test.o test.r &&
+
+       ./rot13.sh <test.o >expected &&
+       git cat-file blob :test.r >actual &&
+       cmp expected actual
 '
 
 test_expect_success 'required filter smudge failure' '
@@ -190,6 +196,14 @@ test_expect_success 'required filter clean failure' '
        test_must_fail git add test.fc
 '
 
+test_expect_success 'filtering large input to small output should use little memory' '
+       git config filter.devnull.clean "cat >/dev/null" &&
+       git config filter.devnull.required true &&
+       for i in $(test_seq 1 30); do printf "%1048576d" 1; done >30MB &&
+       echo "30MB filter=devnull" >.gitattributes &&
+       GIT_MMAP_LIMIT=1m GIT_ALLOC_LIMIT=1m git add 30MB
+'
+
 test_expect_success EXPENSIVE 'filter large file' '
        git config filter.largefile.smudge cat &&
        git config filter.largefile.clean cat &&