t/t0021-conversion.sh - jrn/git - Git at Google

 #!/bin/sh

 test_description='blob conversion via gitattributes'

 . ./test-lib.sh

 TEST_ROOT="$PWD"
 PATH=$TEST_ROOT:$PATH

 write_script <<\EOF "$TEST_ROOT/rot13.sh"
 tr \
   'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ' \
   'nopqrstuvwxyzabcdefghijklmNOPQRSTUVWXYZABCDEFGHIJKLM'
 EOF

 write_script rot13-filter.pl "$PERL_PATH" \
 	<"$TEST_DIRECTORY"/t0021/rot13-filter.pl

 generate_random_characters () {
 	LEN=$1
 	NAME=$2
 	test-genrandom some-seed $LEN |
 		perl -pe "s/./chr((ord($&) % 26) + ord('a'))/sge" >"$TEST_ROOT/$NAME"
 }

 file_size () {
 	perl -e 'print -s $ARGV[0]' "$1"
 }

 filter_git () {
 	rm -f rot13-filter.log &&
 	git "$@"
 }

 # Compare two files and ensure that `clean` and `smudge` respectively are
 # called at least once if specified in the `expect` file. The actual
 # invocation count is not relevant because their number can vary.
 # c.f. http://public-inbox.org/git/xmqqshv18i8i.fsf@gitster.mtv.corp.google.com/
 test_cmp_count () {
 	expect=$1
 	actual=$2
 	for FILE in "$expect" "$actual"
 	do
 		sort "$FILE" | uniq -c |
 		sed -e "s/^ *[0-9][0-9]*[ 	]*IN: /x IN: /" >"$FILE.tmp" &&
 		mv "$FILE.tmp" "$FILE" || return
 	done &&
 	test_cmp "$expect" "$actual"
 }

 # Compare two files but exclude all `clean` invocations because Git can
 # call `clean` zero or more times.
 # c.f. http://public-inbox.org/git/xmqqshv18i8i.fsf@gitster.mtv.corp.google.com/
 test_cmp_exclude_clean () {
 	expect=$1
 	actual=$2
 	for FILE in "$expect" "$actual"
 	do
 		grep -v "IN: clean" "$FILE" >"$FILE.tmp" &&
 		mv "$FILE.tmp" "$FILE"
 	done &&
 	test_cmp "$expect" "$actual"
 }

 # Check that the contents of two files are equal and that their rot13 version
 # is equal to the committed content.
 test_cmp_committed_rot13 () {
 	test_cmp "$1" "$2" &&
 	rot13.sh <"$1" >expected &&
 	git cat-file blob :"$2" >actual &&
 	test_cmp expected actual
 }

 test_expect_success setup '
 	git config filter.rot13.smudge ./rot13.sh &&
 	git config filter.rot13.clean ./rot13.sh &&

 	{
 	    echo "*.t filter=rot13"
 	    echo "*.i ident"
 	} >.gitattributes &&

 	{
 	    echo a b c d e f g h i j k l m
 	    echo n o p q r s t u v w x y z
 	    echo '\''$Id$'\''
 	} >test &&
 	cat test >test.t &&
 	cat test >test.o &&
 	cat test >test.i &&
 	git add test test.t test.i &&
 	rm -f test test.t test.i &&
 	git checkout -- test test.t test.i &&

 	echo "content-test2" >test2.o &&
 	echo "content-test3 - filename with special characters" >"test3 '\''sq'\'',\$x=.o"
 '

 script='s/^\$Id: \([0-9a-f]*\) \$/\1/p'

 test_expect_success check '

 	test_cmp test.o test &&
 	test_cmp test.o test.t &&

 	# ident should be stripped in the repository
 	git diff --raw --exit-code :test :test.i &&
 	id=$(git rev-parse --verify :test) &&
 	embedded=$(sed -ne "$script" test.i) &&
 	test "z$id" = "z$embedded" &&

 	git cat-file blob :test.t >test.r &&

 	./rot13.sh <test.o >test.t &&
 	test_cmp test.r test.t
 '

 # If an expanded ident ever gets into the repository, we want to make sure that
 # it is collapsed before being expanded again on checkout
 test_expect_success expanded_in_repo '
 	{
 		echo "File with expanded keywords"
 		echo "\$Id\$"
 		echo "\$Id:\$"
 		echo "\$Id: 0000000000000000000000000000000000000000 \$"
 		echo "\$Id: NoSpaceAtEnd\$"
 		echo "\$Id:NoSpaceAtFront \$"
 		echo "\$Id:NoSpaceAtEitherEnd\$"
 		echo "\$Id: NoTerminatingSymbol"
 		echo "\$Id: Foreign Commit With Spaces \$"
 	} >expanded-keywords.0 &&

 	{
 		cat expanded-keywords.0 &&
 		printf "\$Id: NoTerminatingSymbolAtEOF"
 	} >expanded-keywords &&
 	cat expanded-keywords >expanded-keywords-crlf &&
 	git add expanded-keywords expanded-keywords-crlf &&
 	git commit -m "File with keywords expanded" &&
 	id=$(git rev-parse --verify :expanded-keywords) &&

 	{
 		echo "File with expanded keywords"
 		echo "\$Id: $id \$"
 		echo "\$Id: $id \$"
 		echo "\$Id: $id \$"
 		echo "\$Id: $id \$"
 		echo "\$Id: $id \$"
 		echo "\$Id: $id \$"
 		echo "\$Id: NoTerminatingSymbol"
 		echo "\$Id: Foreign Commit With Spaces \$"
 	} >expected-output.0 &&
 	{
 		cat expected-output.0 &&
 		printf "\$Id: NoTerminatingSymbolAtEOF"
 	} >expected-output &&
 	{
 		append_cr <expected-output.0 &&
 		printf "\$Id: NoTerminatingSymbolAtEOF"
 	} >expected-output-crlf &&
 	{
 		echo "expanded-keywords ident"
 		echo "expanded-keywords-crlf ident text eol=crlf"
 	} >>.gitattributes &&

 	rm -f expanded-keywords expanded-keywords-crlf &&

 	git checkout -- expanded-keywords &&
 	test_cmp expanded-keywords expected-output &&

 	git checkout -- expanded-keywords-crlf &&
 	test_cmp expanded-keywords-crlf expected-output-crlf
 '

 # The use of %f in a filter definition is expanded to the path to
 # the filename being smudged or cleaned.  It must be shell escaped.
 # First, set up some interesting file names and pet them in
 # .gitattributes.
 test_expect_success 'filter shell-escaped filenames' '
 	cat >argc.sh <<-EOF &&
 	#!$SHELL_PATH
 	cat >/dev/null
 	echo argc: \$# "\$@"
 	EOF
 	normal=name-no-magic &&
 	special="name  with '\''sq'\'' and \$x" &&
 	echo some test text >"$normal" &&
 	echo some test text >"$special" &&
 	git add "$normal" "$special" &&
 	git commit -q -m "add files" &&
 	echo "name* filter=argc" >.gitattributes &&

 	# delete the files and check them out again, using a smudge filter
 	# that will count the args and echo the command-line back to us
 	test_config filter.argc.smudge "sh ./argc.sh %f" &&
 	rm "$normal" "$special" &&
 	git checkout -- "$normal" "$special" &&

 	# make sure argc.sh counted the right number of args
 	echo "argc: 1 $normal" >expect &&
 	test_cmp expect "$normal" &&
 	echo "argc: 1 $special" >expect &&
 	test_cmp expect "$special" &&

 	# do the same thing, but with more args in the filter expression
 	test_config filter.argc.smudge "sh ./argc.sh %f --my-extra-arg" &&
 	rm "$normal" "$special" &&
 	git checkout -- "$normal" "$special" &&

 	# make sure argc.sh counted the right number of args
 	echo "argc: 2 $normal --my-extra-arg" >expect &&
 	test_cmp expect "$normal" &&
 	echo "argc: 2 $special --my-extra-arg" >expect &&
 	test_cmp expect "$special" &&
 	:
 '

 test_expect_success 'required filter should filter data' '
 	test_config filter.required.smudge ./rot13.sh &&
 	test_config filter.required.clean ./rot13.sh &&
 	test_config filter.required.required true &&

 	echo "*.r filter=required" >.gitattributes &&

 	cat test.o >test.r &&
 	git add test.r &&

 	rm -f test.r &&
 	git checkout -- test.r &&
 	test_cmp test.o test.r &&

 	./rot13.sh <test.o >expected &&
 	git cat-file blob :test.r >actual &&
 	test_cmp expected actual
 '

 test_expect_success 'required filter smudge failure' '
 	test_config filter.failsmudge.smudge false &&
 	test_config filter.failsmudge.clean cat &&
 	test_config filter.failsmudge.required true &&

 	echo "*.fs filter=failsmudge" >.gitattributes &&

 	echo test >test.fs &&
 	git add test.fs &&
 	rm -f test.fs &&
 	test_must_fail git checkout -- test.fs
 '

 test_expect_success 'required filter clean failure' '
 	test_config filter.failclean.smudge cat &&
 	test_config filter.failclean.clean false &&
 	test_config filter.failclean.required true &&

 	echo "*.fc filter=failclean" >.gitattributes &&

 	echo test >test.fc &&
 	test_must_fail git add test.fc
 '

 test_expect_success 'filtering large input to small output should use little memory' '
 	test_config filter.devnull.clean "cat >/dev/null" &&
 	test_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 'filter that does not read is fine' '
 	test-genrandom foo $((128 * 1024 + 1)) >big &&
 	echo "big filter=epipe" >.gitattributes &&
 	test_config filter.epipe.clean "echo xyzzy" &&
 	git add big &&
 	git cat-file blob :big >actual &&
 	echo xyzzy >expect &&
 	test_cmp expect actual
 '

 test_expect_success EXPENSIVE 'filter large file' '
 	test_config filter.largefile.smudge cat &&
 	test_config filter.largefile.clean cat &&
 	for i in $(test_seq 1 2048); do printf "%1048576d" 1; done >2GB &&
 	echo "2GB filter=largefile" >.gitattributes &&
 	git add 2GB 2>err &&
 	test_must_be_empty err &&
 	rm -f 2GB &&
 	git checkout -- 2GB 2>err &&
 	test_must_be_empty err
 '

 test_expect_success "filter: clean empty file" '
 	test_config filter.in-repo-header.clean  "echo cleaned && cat" &&
 	test_config filter.in-repo-header.smudge "sed 1d" &&

 	echo "empty-in-worktree    filter=in-repo-header" >>.gitattributes &&
 	>empty-in-worktree &&

 	echo cleaned >expected &&
 	git add empty-in-worktree &&
 	git show :empty-in-worktree >actual &&
 	test_cmp expected actual
 '

 test_expect_success "filter: smudge empty file" '
 	test_config filter.empty-in-repo.clean "cat >/dev/null" &&
 	test_config filter.empty-in-repo.smudge "echo smudged && cat" &&

 	echo "empty-in-repo filter=empty-in-repo" >>.gitattributes &&
 	echo dead data walking >empty-in-repo &&
 	git add empty-in-repo &&

 	echo smudged >expected &&
 	git checkout-index --prefix=filtered- empty-in-repo &&
 	test_cmp expected filtered-empty-in-repo
 '

 test_expect_success 'disable filter with empty override' '
 	test_config_global filter.disable.smudge false &&
 	test_config_global filter.disable.clean false &&
 	test_config filter.disable.smudge false &&
 	test_config filter.disable.clean false &&

 	echo "*.disable filter=disable" >.gitattributes &&

 	echo test >test.disable &&
 	git -c filter.disable.clean= add test.disable 2>err &&
 	test_must_be_empty err &&
 	rm -f test.disable &&
 	git -c filter.disable.smudge= checkout -- test.disable 2>err &&
 	test_must_be_empty err
 '

 test_expect_success 'diff does not reuse worktree files that need cleaning' '
 	test_config filter.counter.clean "echo . >>count; sed s/^/clean:/" &&
 	echo "file filter=counter" >.gitattributes &&
 	test_commit one file &&
 	test_commit two file &&

 	>count &&
 	git diff-tree -p HEAD &&
 	test_line_count = 0 count
 '

 test_expect_success PERL 'required process filter should filter data' '
 	test_config_global filter.protocol.process "rot13-filter.pl clean smudge" &&
 	test_config_global filter.protocol.required true &&
 	rm -rf repo &&
 	mkdir repo &&
 	(
 		cd repo &&
 		git init &&

 		echo "*.r filter=protocol" >.gitattributes &&
 		git add . &&
 		git commit -m "test commit 1" &&
 		git branch empty-branch &&

 		cp "$TEST_ROOT/test.o" test.r &&
 		cp "$TEST_ROOT/test2.o" test2.r &&
 		mkdir testsubdir &&
 		cp "$TEST_ROOT/test3 '\''sq'\'',\$x=.o" "testsubdir/test3 '\''sq'\'',\$x=.r" &&
 		>test4-empty.r &&

 		S=$(file_size test.r) &&
 		S2=$(file_size test2.r) &&
 		S3=$(file_size "testsubdir/test3 '\''sq'\'',\$x=.r") &&

 		filter_git add . &&
 		cat >expected.log <<-EOF &&
 			START
 			init handshake complete
 			IN: clean test.r $S [OK] -- OUT: $S . [OK]
 			IN: clean test2.r $S2 [OK] -- OUT: $S2 . [OK]
 			IN: clean test4-empty.r 0 [OK] -- OUT: 0  [OK]
 			IN: clean testsubdir/test3 '\''sq'\'',\$x=.r $S3 [OK] -- OUT: $S3 . [OK]
 			STOP
 		EOF
 		test_cmp_count expected.log rot13-filter.log &&

 		git commit -m "test commit 2" &&
 		rm -f test2.r "testsubdir/test3 '\''sq'\'',\$x=.r" &&

 		filter_git checkout --quiet --no-progress . &&
 		cat >expected.log <<-EOF &&
 			START
 			init handshake complete
 			IN: smudge test2.r $S2 [OK] -- OUT: $S2 . [OK]
 			IN: smudge testsubdir/test3 '\''sq'\'',\$x=.r $S3 [OK] -- OUT: $S3 . [OK]
 			STOP
 		EOF
 		test_cmp_exclude_clean expected.log rot13-filter.log &&

 		filter_git checkout --quiet --no-progress empty-branch &&
 		cat >expected.log <<-EOF &&
 			START
 			init handshake complete
 			IN: clean test.r $S [OK] -- OUT: $S . [OK]
 			STOP
 		EOF
 		test_cmp_exclude_clean expected.log rot13-filter.log &&

 		filter_git checkout --quiet --no-progress master &&
 		cat >expected.log <<-EOF &&
 			START
 			init handshake complete
 			IN: smudge test.r $S [OK] -- OUT: $S . [OK]
 			IN: smudge test2.r $S2 [OK] -- OUT: $S2 . [OK]
 			IN: smudge test4-empty.r 0 [OK] -- OUT: 0  [OK]
 			IN: smudge testsubdir/test3 '\''sq'\'',\$x=.r $S3 [OK] -- OUT: $S3 . [OK]
 			STOP
 		EOF
 		test_cmp_exclude_clean expected.log rot13-filter.log &&

 		test_cmp_committed_rot13 "$TEST_ROOT/test.o" test.r &&
 		test_cmp_committed_rot13 "$TEST_ROOT/test2.o" test2.r &&
 		test_cmp_committed_rot13 "$TEST_ROOT/test3 '\''sq'\'',\$x=.o" "testsubdir/test3 '\''sq'\'',\$x=.r"
 	)
 '

 test_expect_success PERL 'required process filter takes precedence' '
 	test_config_global filter.protocol.clean false &&
 	test_config_global filter.protocol.process "rot13-filter.pl clean" &&
 	test_config_global filter.protocol.required true &&
 	rm -rf repo &&
 	mkdir repo &&
 	(
 		cd repo &&
 		git init &&

 		echo "*.r filter=protocol" >.gitattributes &&
 		cp "$TEST_ROOT/test.o" test.r &&
 		S=$(file_size test.r) &&

 		# Check that the process filter is invoked here
 		filter_git add . &&
 		cat >expected.log <<-EOF &&
 			START
 			init handshake complete
 			IN: clean test.r $S [OK] -- OUT: $S . [OK]
 			STOP
 		EOF
 		test_cmp_count expected.log rot13-filter.log
 	)
 '

 test_expect_success PERL 'required process filter should be used only for "clean" operation only' '
 	test_config_global filter.protocol.process "rot13-filter.pl clean" &&
 	rm -rf repo &&
 	mkdir repo &&
 	(
 		cd repo &&
 		git init &&

 		echo "*.r filter=protocol" >.gitattributes &&
 		cp "$TEST_ROOT/test.o" test.r &&
 		S=$(file_size test.r) &&

 		filter_git add . &&
 		cat >expected.log <<-EOF &&
 			START
 			init handshake complete
 			IN: clean test.r $S [OK] -- OUT: $S . [OK]
 			STOP
 		EOF
 		test_cmp_count expected.log rot13-filter.log &&

 		rm test.r &&

 		filter_git checkout --quiet --no-progress . &&
 		# If the filter would be used for "smudge", too, we would see
 		# "IN: smudge test.r 57 [OK] -- OUT: 57 . [OK]" here
 		cat >expected.log <<-EOF &&
 			START
 			init handshake complete
 			STOP
 		EOF
 		test_cmp_exclude_clean expected.log rot13-filter.log
 	)
 '

 test_expect_success PERL 'required process filter should process multiple packets' '
 	test_config_global filter.protocol.process "rot13-filter.pl clean smudge" &&
 	test_config_global filter.protocol.required true &&

 	rm -rf repo &&
 	mkdir repo &&
 	(
 		cd repo &&
 		git init &&

 		# Generate data requiring 1, 2, 3 packets
 		S=65516 && # PKTLINE_DATA_MAXLEN -> Maximal size of a packet
 		generate_random_characters $(($S    )) 1pkt_1__.file &&
 		generate_random_characters $(($S  +1)) 2pkt_1+1.file &&
 		generate_random_characters $(($S*2-1)) 2pkt_2-1.file &&
 		generate_random_characters $(($S*2  )) 2pkt_2__.file &&
 		generate_random_characters $(($S*2+1)) 3pkt_2+1.file &&

 		for FILE in "$TEST_ROOT"/*.file
 		do
 			cp "$FILE" . &&
 			rot13.sh <"$FILE" >"$FILE.rot13"
 		done &&

 		echo "*.file filter=protocol" >.gitattributes &&
 		filter_git add *.file .gitattributes &&
 		cat >expected.log <<-EOF &&
 			START
 			init handshake complete
 			IN: clean 1pkt_1__.file $(($S    )) [OK] -- OUT: $(($S    )) . [OK]
 			IN: clean 2pkt_1+1.file $(($S  +1)) [OK] -- OUT: $(($S  +1)) .. [OK]
 			IN: clean 2pkt_2-1.file $(($S*2-1)) [OK] -- OUT: $(($S*2-1)) .. [OK]
 			IN: clean 2pkt_2__.file $(($S*2  )) [OK] -- OUT: $(($S*2  )) .. [OK]
 			IN: clean 3pkt_2+1.file $(($S*2+1)) [OK] -- OUT: $(($S*2+1)) ... [OK]
 			STOP
 		EOF
 		test_cmp_count expected.log rot13-filter.log &&

 		rm -f *.file &&

 		filter_git checkout --quiet --no-progress -- *.file &&
 		cat >expected.log <<-EOF &&
 			START
 			init handshake complete
 			IN: smudge 1pkt_1__.file $(($S    )) [OK] -- OUT: $(($S    )) . [OK]
 			IN: smudge 2pkt_1+1.file $(($S  +1)) [OK] -- OUT: $(($S  +1)) .. [OK]
 			IN: smudge 2pkt_2-1.file $(($S*2-1)) [OK] -- OUT: $(($S*2-1)) .. [OK]
 			IN: smudge 2pkt_2__.file $(($S*2  )) [OK] -- OUT: $(($S*2  )) .. [OK]
 			IN: smudge 3pkt_2+1.file $(($S*2+1)) [OK] -- OUT: $(($S*2+1)) ... [OK]
 			STOP
 		EOF
 		test_cmp_exclude_clean expected.log rot13-filter.log &&

 		for FILE in *.file
 		do
 			test_cmp_committed_rot13 "$TEST_ROOT/$FILE" $FILE
 		done
 	)
 '

 test_expect_success PERL 'required process filter with clean error should fail' '
 	test_config_global filter.protocol.process "rot13-filter.pl clean smudge" &&
 	test_config_global filter.protocol.required true &&
 	rm -rf repo &&
 	mkdir repo &&
 	(
 		cd repo &&
 		git init &&

 		echo "*.r filter=protocol" >.gitattributes &&

 		cp "$TEST_ROOT/test.o" test.r &&
 		echo "this is going to fail" >clean-write-fail.r &&
 		echo "content-test3-subdir" >test3.r &&

 		test_must_fail git add .
 	)
 '

 test_expect_success PERL 'process filter should restart after unexpected write failure' '
 	test_config_global filter.protocol.process "rot13-filter.pl clean smudge" &&
 	rm -rf repo &&
 	mkdir repo &&
 	(
 		cd repo &&
 		git init &&

 		echo "*.r filter=protocol" >.gitattributes &&

 		cp "$TEST_ROOT/test.o" test.r &&
 		cp "$TEST_ROOT/test2.o" test2.r &&
 		echo "this is going to fail" >smudge-write-fail.o &&
 		cp smudge-write-fail.o smudge-write-fail.r &&

 		S=$(file_size test.r) &&
 		S2=$(file_size test2.r) &&
 		SF=$(file_size smudge-write-fail.r) &&

 		git add . &&
 		rm -f *.r &&

 		rm -f rot13-filter.log &&
 		git checkout --quiet --no-progress . 2>git-stderr.log &&

 		grep "smudge write error at" git-stderr.log &&
 		grep "error: external filter" git-stderr.log &&

 		cat >expected.log <<-EOF &&
 			START
 			init handshake complete
 			IN: smudge smudge-write-fail.r $SF [OK] -- OUT: $SF [WRITE FAIL]
 			START
 			init handshake complete
 			IN: smudge test.r $S [OK] -- OUT: $S . [OK]
 			IN: smudge test2.r $S2 [OK] -- OUT: $S2 . [OK]
 			STOP
 		EOF
 		test_cmp_exclude_clean expected.log rot13-filter.log &&

 		test_cmp_committed_rot13 "$TEST_ROOT/test.o" test.r &&
 		test_cmp_committed_rot13 "$TEST_ROOT/test2.o" test2.r &&

 		# Smudge failed
 		! test_cmp smudge-write-fail.o smudge-write-fail.r &&
 		rot13.sh <smudge-write-fail.o >expected &&
 		git cat-file blob :smudge-write-fail.r >actual &&
 		test_cmp expected actual
 	)
 '

 test_expect_success PERL 'process filter should not be restarted if it signals an error' '
 	test_config_global filter.protocol.process "rot13-filter.pl clean smudge" &&
 	rm -rf repo &&
 	mkdir repo &&
 	(
 		cd repo &&
 		git init &&

 		echo "*.r filter=protocol" >.gitattributes &&

 		cp "$TEST_ROOT/test.o" test.r &&
 		cp "$TEST_ROOT/test2.o" test2.r &&
 		echo "this will cause an error" >error.o &&
 		cp error.o error.r &&

 		S=$(file_size test.r) &&
 		S2=$(file_size test2.r) &&
 		SE=$(file_size error.r) &&

 		git add . &&
 		rm -f *.r &&

 		filter_git checkout --quiet --no-progress . &&
 		cat >expected.log <<-EOF &&
 			START
 			init handshake complete
 			IN: smudge error.r $SE [OK] -- OUT: 0 [ERROR]
 			IN: smudge test.r $S [OK] -- OUT: $S . [OK]
 			IN: smudge test2.r $S2 [OK] -- OUT: $S2 . [OK]
 			STOP
 		EOF
 		test_cmp_exclude_clean expected.log rot13-filter.log &&

 		test_cmp_committed_rot13 "$TEST_ROOT/test.o" test.r &&
 		test_cmp_committed_rot13 "$TEST_ROOT/test2.o" test2.r &&
 		test_cmp error.o error.r
 	)
 '

 test_expect_success PERL 'process filter abort stops processing of all further files' '
 	test_config_global filter.protocol.process "rot13-filter.pl clean smudge" &&
 	rm -rf repo &&
 	mkdir repo &&
 	(
 		cd repo &&
 		git init &&

 		echo "*.r filter=protocol" >.gitattributes &&

 		cp "$TEST_ROOT/test.o" test.r &&
 		cp "$TEST_ROOT/test2.o" test2.r &&
 		echo "error this blob and all future blobs" >abort.o &&
 		cp abort.o abort.r &&

 		SA=$(file_size abort.r) &&

 		git add . &&
 		rm -f *.r &&

 		# Note: This test assumes that Git filters files in alphabetical
 		# order ("abort.r" before "test.r").
 		filter_git checkout --quiet --no-progress . &&
 		cat >expected.log <<-EOF &&
 			START
 			init handshake complete
 			IN: smudge abort.r $SA [OK] -- OUT: 0 [ABORT]
 			STOP
 		EOF
 		test_cmp_exclude_clean expected.log rot13-filter.log &&

 		test_cmp "$TEST_ROOT/test.o" test.r &&
 		test_cmp "$TEST_ROOT/test2.o" test2.r &&
 		test_cmp abort.o abort.r
 	)
 '

 test_expect_success PERL 'invalid process filter must fail (and not hang!)' '
 	test_config_global filter.protocol.process cat &&
 	test_config_global filter.protocol.required true &&
 	rm -rf repo &&
 	mkdir repo &&
 	(
 		cd repo &&
 		git init &&

 		echo "*.r filter=protocol" >.gitattributes &&

 		cp "$TEST_ROOT/test.o" test.r &&
 		test_must_fail git add . 2>git-stderr.log &&
 		grep "does not support filter protocol version" git-stderr.log
 	)
 '

 test_done
	#!/bin/sh

	test_description='blob conversion via gitattributes'

	. ./test-lib.sh

	TEST_ROOT="$PWD"
	PATH=$TEST_ROOT:$PATH

	write_script <<\EOF "$TEST_ROOT/rot13.sh"
	tr \
	'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ' \
	'nopqrstuvwxyzabcdefghijklmNOPQRSTUVWXYZABCDEFGHIJKLM'
	EOF

	write_script rot13-filter.pl "$PERL_PATH" \
	<"$TEST_DIRECTORY"/t0021/rot13-filter.pl

	generate_random_characters () {
	LEN=$1
	NAME=$2
	test-genrandom some-seed $LEN \|
	perl -pe "s/./chr((ord($&) % 26) + ord('a'))/sge" >"$TEST_ROOT/$NAME"
	}

	file_size () {
	perl -e 'print -s $ARGV[0]' "$1"
	}

	filter_git () {
	rm -f rot13-filter.log &&
	git "$@"
	}

	# Compare two files and ensure that `clean` and `smudge` respectively are
	# called at least once if specified in the `expect` file. The actual
	# invocation count is not relevant because their number can vary.
	# c.f. http://public-inbox.org/git/xmqqshv18i8i.fsf@gitster.mtv.corp.google.com/
	test_cmp_count () {
	expect=$1
	actual=$2
	for FILE in "$expect" "$actual"
	do
	sort "$FILE" \| uniq -c \|
	sed -e "s/^ [0-9][0-9][ ]*IN: /x IN: /" >"$FILE.tmp" &&
	mv "$FILE.tmp" "$FILE" \|\| return
	done &&
	test_cmp "$expect" "$actual"
	}

	# Compare two files but exclude all `clean` invocations because Git can
	# call `clean` zero or more times.
	# c.f. http://public-inbox.org/git/xmqqshv18i8i.fsf@gitster.mtv.corp.google.com/
	test_cmp_exclude_clean () {
	expect=$1
	actual=$2
	for FILE in "$expect" "$actual"
	do
	grep -v "IN: clean" "$FILE" >"$FILE.tmp" &&
	mv "$FILE.tmp" "$FILE"
	done &&
	test_cmp "$expect" "$actual"
	}

	# Check that the contents of two files are equal and that their rot13 version
	# is equal to the committed content.
	test_cmp_committed_rot13 () {
	test_cmp "$1" "$2" &&
	rot13.sh <"$1" >expected &&
	git cat-file blob :"$2" >actual &&
	test_cmp expected actual
	}

	test_expect_success setup '
	git config filter.rot13.smudge ./rot13.sh &&
	git config filter.rot13.clean ./rot13.sh &&

	{
	echo "*.t filter=rot13"
	echo "*.i ident"
	} >.gitattributes &&

	{
	echo a b c d e f g h i j k l m
	echo n o p q r s t u v w x y z
	echo '\''$Id$'\''
	} >test &&
	cat test >test.t &&
	cat test >test.o &&
	cat test >test.i &&
	git add test test.t test.i &&
	rm -f test test.t test.i &&
	git checkout -- test test.t test.i &&

	echo "content-test2" >test2.o &&
	echo "content-test3 - filename with special characters" >"test3 '\''sq'\'',\$x=.o"
	'

	script='s/^\$Id: \([0-9a-f]*\) \$/\1/p'

	test_expect_success check '

	test_cmp test.o test &&
	test_cmp test.o test.t &&

	# ident should be stripped in the repository
	git diff --raw --exit-code :test :test.i &&
	id=$(git rev-parse --verify :test) &&
	embedded=$(sed -ne "$script" test.i) &&
	test "z$id" = "z$embedded" &&

	git cat-file blob :test.t >test.r &&

	./rot13.sh <test.o >test.t &&
	test_cmp test.r test.t
	'

	# If an expanded ident ever gets into the repository, we want to make sure that
	# it is collapsed before being expanded again on checkout
	test_expect_success expanded_in_repo '
	{
	echo "File with expanded keywords"
	echo "\$Id\$"
	echo "\$Id:\$"
	echo "\$Id: 0000000000000000000000000000000000000000 \$"
	echo "\$Id: NoSpaceAtEnd\$"
	echo "\$Id:NoSpaceAtFront \$"
	echo "\$Id:NoSpaceAtEitherEnd\$"
	echo "\$Id: NoTerminatingSymbol"
	echo "\$Id: Foreign Commit With Spaces \$"
	} >expanded-keywords.0 &&

	{
	cat expanded-keywords.0 &&
	printf "\$Id: NoTerminatingSymbolAtEOF"
	} >expanded-keywords &&
	cat expanded-keywords >expanded-keywords-crlf &&
	git add expanded-keywords expanded-keywords-crlf &&
	git commit -m "File with keywords expanded" &&
	id=$(git rev-parse --verify :expanded-keywords) &&

	{
	echo "File with expanded keywords"
	echo "\$Id: $id \$"
	echo "\$Id: $id \$"
	echo "\$Id: $id \$"
	echo "\$Id: $id \$"
	echo "\$Id: $id \$"
	echo "\$Id: $id \$"
	echo "\$Id: NoTerminatingSymbol"
	echo "\$Id: Foreign Commit With Spaces \$"
	} >expected-output.0 &&
	{
	cat expected-output.0 &&
	printf "\$Id: NoTerminatingSymbolAtEOF"
	} >expected-output &&
	{
	append_cr <expected-output.0 &&
	printf "\$Id: NoTerminatingSymbolAtEOF"
	} >expected-output-crlf &&
	{
	echo "expanded-keywords ident"
	echo "expanded-keywords-crlf ident text eol=crlf"
	} >>.gitattributes &&

	rm -f expanded-keywords expanded-keywords-crlf &&

	git checkout -- expanded-keywords &&
	test_cmp expanded-keywords expected-output &&

	git checkout -- expanded-keywords-crlf &&
	test_cmp expanded-keywords-crlf expected-output-crlf
	'

	# The use of %f in a filter definition is expanded to the path to
	# the filename being smudged or cleaned. It must be shell escaped.
	# First, set up some interesting file names and pet them in
	# .gitattributes.
	test_expect_success 'filter shell-escaped filenames' '
	cat >argc.sh <<-EOF &&
	#!$SHELL_PATH
	cat >/dev/null
	echo argc: \$# "\$@"
	EOF
	normal=name-no-magic &&
	special="name with '\''sq'\'' and \$x" &&
	echo some test text >"$normal" &&
	echo some test text >"$special" &&
	git add "$normal" "$special" &&
	git commit -q -m "add files" &&
	echo "name* filter=argc" >.gitattributes &&

	# delete the files and check them out again, using a smudge filter
	# that will count the args and echo the command-line back to us
	test_config filter.argc.smudge "sh ./argc.sh %f" &&
	rm "$normal" "$special" &&
	git checkout -- "$normal" "$special" &&

	# make sure argc.sh counted the right number of args
	echo "argc: 1 $normal" >expect &&
	test_cmp expect "$normal" &&
	echo "argc: 1 $special" >expect &&
	test_cmp expect "$special" &&

	# do the same thing, but with more args in the filter expression
	test_config filter.argc.smudge "sh ./argc.sh %f --my-extra-arg" &&
	rm "$normal" "$special" &&
	git checkout -- "$normal" "$special" &&

	# make sure argc.sh counted the right number of args
	echo "argc: 2 $normal --my-extra-arg" >expect &&
	test_cmp expect "$normal" &&
	echo "argc: 2 $special --my-extra-arg" >expect &&
	test_cmp expect "$special" &&
	:
	'

	test_expect_success 'required filter should filter data' '
	test_config filter.required.smudge ./rot13.sh &&
	test_config filter.required.clean ./rot13.sh &&
	test_config filter.required.required true &&

	echo "*.r filter=required" >.gitattributes &&

	cat test.o >test.r &&
	git add test.r &&

	rm -f test.r &&
	git checkout -- test.r &&
	test_cmp test.o test.r &&

	./rot13.sh <test.o >expected &&
	git cat-file blob :test.r >actual &&
	test_cmp expected actual
	'

	test_expect_success 'required filter smudge failure' '
	test_config filter.failsmudge.smudge false &&
	test_config filter.failsmudge.clean cat &&
	test_config filter.failsmudge.required true &&

	echo "*.fs filter=failsmudge" >.gitattributes &&

	echo test >test.fs &&
	git add test.fs &&
	rm -f test.fs &&
	test_must_fail git checkout -- test.fs
	'

	test_expect_success 'required filter clean failure' '
	test_config filter.failclean.smudge cat &&
	test_config filter.failclean.clean false &&
	test_config filter.failclean.required true &&

	echo "*.fc filter=failclean" >.gitattributes &&

	echo test >test.fc &&
	test_must_fail git add test.fc
	'

	test_expect_success 'filtering large input to small output should use little memory' '
	test_config filter.devnull.clean "cat >/dev/null" &&
	test_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 'filter that does not read is fine' '
	test-genrandom foo $((128 * 1024 + 1)) >big &&
	echo "big filter=epipe" >.gitattributes &&
	test_config filter.epipe.clean "echo xyzzy" &&
	git add big &&
	git cat-file blob :big >actual &&
	echo xyzzy >expect &&
	test_cmp expect actual
	'

	test_expect_success EXPENSIVE 'filter large file' '
	test_config filter.largefile.smudge cat &&
	test_config filter.largefile.clean cat &&
	for i in $(test_seq 1 2048); do printf "%1048576d" 1; done >2GB &&
	echo "2GB filter=largefile" >.gitattributes &&
	git add 2GB 2>err &&
	test_must_be_empty err &&
	rm -f 2GB &&
	git checkout -- 2GB 2>err &&
	test_must_be_empty err
	'

	test_expect_success "filter: clean empty file" '
	test_config filter.in-repo-header.clean "echo cleaned && cat" &&
	test_config filter.in-repo-header.smudge "sed 1d" &&

	echo "empty-in-worktree filter=in-repo-header" >>.gitattributes &&
	>empty-in-worktree &&

	echo cleaned >expected &&
	git add empty-in-worktree &&
	git show :empty-in-worktree >actual &&
	test_cmp expected actual
	'

	test_expect_success "filter: smudge empty file" '
	test_config filter.empty-in-repo.clean "cat >/dev/null" &&
	test_config filter.empty-in-repo.smudge "echo smudged && cat" &&

	echo "empty-in-repo filter=empty-in-repo" >>.gitattributes &&
	echo dead data walking >empty-in-repo &&
	git add empty-in-repo &&

	echo smudged >expected &&
	git checkout-index --prefix=filtered- empty-in-repo &&
	test_cmp expected filtered-empty-in-repo
	'

	test_expect_success 'disable filter with empty override' '
	test_config_global filter.disable.smudge false &&
	test_config_global filter.disable.clean false &&
	test_config filter.disable.smudge false &&
	test_config filter.disable.clean false &&

	echo "*.disable filter=disable" >.gitattributes &&

	echo test >test.disable &&
	git -c filter.disable.clean= add test.disable 2>err &&
	test_must_be_empty err &&
	rm -f test.disable &&
	git -c filter.disable.smudge= checkout -- test.disable 2>err &&
	test_must_be_empty err
	'

	test_expect_success 'diff does not reuse worktree files that need cleaning' '
	test_config filter.counter.clean "echo . >>count; sed s/^/clean:/" &&
	echo "file filter=counter" >.gitattributes &&
	test_commit one file &&
	test_commit two file &&

	>count &&
	git diff-tree -p HEAD &&
	test_line_count = 0 count
	'

	test_expect_success PERL 'required process filter should filter data' '
	test_config_global filter.protocol.process "rot13-filter.pl clean smudge" &&
	test_config_global filter.protocol.required true &&
	rm -rf repo &&
	mkdir repo &&
	(
	cd repo &&
	git init &&

	echo "*.r filter=protocol" >.gitattributes &&
	git add . &&
	git commit -m "test commit 1" &&
	git branch empty-branch &&

	cp "$TEST_ROOT/test.o" test.r &&
	cp "$TEST_ROOT/test2.o" test2.r &&
	mkdir testsubdir &&
	cp "$TEST_ROOT/test3 '\''sq'\'',\$x=.o" "testsubdir/test3 '\''sq'\'',\$x=.r" &&
	>test4-empty.r &&

	S=$(file_size test.r) &&
	S2=$(file_size test2.r) &&
	S3=$(file_size "testsubdir/test3 '\''sq'\'',\$x=.r") &&

	filter_git add . &&
	cat >expected.log <<-EOF &&
	START
	init handshake complete
	IN: clean test.r $S [OK] -- OUT: $S . [OK]
	IN: clean test2.r $S2 [OK] -- OUT: $S2 . [OK]
	IN: clean test4-empty.r 0 [OK] -- OUT: 0 [OK]
	IN: clean testsubdir/test3 '\''sq'\'',\$x=.r $S3 [OK] -- OUT: $S3 . [OK]
	STOP
	EOF
	test_cmp_count expected.log rot13-filter.log &&

	git commit -m "test commit 2" &&
	rm -f test2.r "testsubdir/test3 '\''sq'\'',\$x=.r" &&

	filter_git checkout --quiet --no-progress . &&
	cat >expected.log <<-EOF &&
	START
	init handshake complete
	IN: smudge test2.r $S2 [OK] -- OUT: $S2 . [OK]
	IN: smudge testsubdir/test3 '\''sq'\'',\$x=.r $S3 [OK] -- OUT: $S3 . [OK]
	STOP
	EOF
	test_cmp_exclude_clean expected.log rot13-filter.log &&

	filter_git checkout --quiet --no-progress empty-branch &&
	cat >expected.log <<-EOF &&
	START
	init handshake complete
	IN: clean test.r $S [OK] -- OUT: $S . [OK]
	STOP
	EOF
	test_cmp_exclude_clean expected.log rot13-filter.log &&

	filter_git checkout --quiet --no-progress master &&
	cat >expected.log <<-EOF &&
	START
	init handshake complete
	IN: smudge test.r $S [OK] -- OUT: $S . [OK]
	IN: smudge test2.r $S2 [OK] -- OUT: $S2 . [OK]
	IN: smudge test4-empty.r 0 [OK] -- OUT: 0 [OK]
	IN: smudge testsubdir/test3 '\''sq'\'',\$x=.r $S3 [OK] -- OUT: $S3 . [OK]
	STOP
	EOF
	test_cmp_exclude_clean expected.log rot13-filter.log &&

	test_cmp_committed_rot13 "$TEST_ROOT/test.o" test.r &&
	test_cmp_committed_rot13 "$TEST_ROOT/test2.o" test2.r &&
	test_cmp_committed_rot13 "$TEST_ROOT/test3 '\''sq'\'',\$x=.o" "testsubdir/test3 '\''sq'\'',\$x=.r"
	)
	'

	test_expect_success PERL 'required process filter takes precedence' '
	test_config_global filter.protocol.clean false &&
	test_config_global filter.protocol.process "rot13-filter.pl clean" &&
	test_config_global filter.protocol.required true &&
	rm -rf repo &&
	mkdir repo &&
	(
	cd repo &&
	git init &&

	echo "*.r filter=protocol" >.gitattributes &&
	cp "$TEST_ROOT/test.o" test.r &&
	S=$(file_size test.r) &&

	# Check that the process filter is invoked here
	filter_git add . &&
	cat >expected.log <<-EOF &&
	START
	init handshake complete
	IN: clean test.r $S [OK] -- OUT: $S . [OK]
	STOP
	EOF
	test_cmp_count expected.log rot13-filter.log
	)
	'

	test_expect_success PERL 'required process filter should be used only for "clean" operation only' '
	test_config_global filter.protocol.process "rot13-filter.pl clean" &&
	rm -rf repo &&
	mkdir repo &&
	(
	cd repo &&
	git init &&

	echo "*.r filter=protocol" >.gitattributes &&
	cp "$TEST_ROOT/test.o" test.r &&
	S=$(file_size test.r) &&

	filter_git add . &&
	cat >expected.log <<-EOF &&
	START
	init handshake complete
	IN: clean test.r $S [OK] -- OUT: $S . [OK]
	STOP
	EOF
	test_cmp_count expected.log rot13-filter.log &&

	rm test.r &&

	filter_git checkout --quiet --no-progress . &&
	# If the filter would be used for "smudge", too, we would see
	# "IN: smudge test.r 57 [OK] -- OUT: 57 . [OK]" here
	cat >expected.log <<-EOF &&
	START
	init handshake complete
	STOP
	EOF
	test_cmp_exclude_clean expected.log rot13-filter.log
	)
	'

	test_expect_success PERL 'required process filter should process multiple packets' '
	test_config_global filter.protocol.process "rot13-filter.pl clean smudge" &&
	test_config_global filter.protocol.required true &&

	rm -rf repo &&
	mkdir repo &&
	(
	cd repo &&
	git init &&

	# Generate data requiring 1, 2, 3 packets
	S=65516 && # PKTLINE_DATA_MAXLEN -> Maximal size of a packet
	generate_random_characters $(($S )) 1pkt_1__.file &&
	generate_random_characters $(($S +1)) 2pkt_1+1.file &&
	generate_random_characters $(($S*2-1)) 2pkt_2-1.file &&
	generate_random_characters $(($S*2 )) 2pkt_2__.file &&
	generate_random_characters $(($S*2+1)) 3pkt_2+1.file &&

	for FILE in "$TEST_ROOT"/*.file
	do
	cp "$FILE" . &&
	rot13.sh <"$FILE" >"$FILE.rot13"
	done &&

	echo "*.file filter=protocol" >.gitattributes &&
	filter_git add *.file .gitattributes &&
	cat >expected.log <<-EOF &&
	START
	init handshake complete
	IN: clean 1pkt_1__.file $(($S )) [OK] -- OUT: $(($S )) . [OK]
	IN: clean 2pkt_1+1.file $(($S +1)) [OK] -- OUT: $(($S +1)) .. [OK]
	IN: clean 2pkt_2-1.file $(($S2-1)) [OK] -- OUT: $(($S2-1)) .. [OK]
	IN: clean 2pkt_2__.file $(($S2 )) [OK] -- OUT: $(($S2 )) .. [OK]
	IN: clean 3pkt_2+1.file $(($S2+1)) [OK] -- OUT: $(($S2+1)) ... [OK]
	STOP
	EOF
	test_cmp_count expected.log rot13-filter.log &&

	rm -f *.file &&

	filter_git checkout --quiet --no-progress -- *.file &&
	cat >expected.log <<-EOF &&
	START
	init handshake complete
	IN: smudge 1pkt_1__.file $(($S )) [OK] -- OUT: $(($S )) . [OK]
	IN: smudge 2pkt_1+1.file $(($S +1)) [OK] -- OUT: $(($S +1)) .. [OK]
	IN: smudge 2pkt_2-1.file $(($S2-1)) [OK] -- OUT: $(($S2-1)) .. [OK]
	IN: smudge 2pkt_2__.file $(($S2 )) [OK] -- OUT: $(($S2 )) .. [OK]
	IN: smudge 3pkt_2+1.file $(($S2+1)) [OK] -- OUT: $(($S2+1)) ... [OK]
	STOP
	EOF
	test_cmp_exclude_clean expected.log rot13-filter.log &&

	for FILE in *.file
	do
	test_cmp_committed_rot13 "$TEST_ROOT/$FILE" $FILE
	done
	)
	'

	test_expect_success PERL 'required process filter with clean error should fail' '
	test_config_global filter.protocol.process "rot13-filter.pl clean smudge" &&
	test_config_global filter.protocol.required true &&
	rm -rf repo &&
	mkdir repo &&
	(
	cd repo &&
	git init &&

	echo "*.r filter=protocol" >.gitattributes &&

	cp "$TEST_ROOT/test.o" test.r &&
	echo "this is going to fail" >clean-write-fail.r &&
	echo "content-test3-subdir" >test3.r &&

	test_must_fail git add .
	)
	'

	test_expect_success PERL 'process filter should restart after unexpected write failure' '
	test_config_global filter.protocol.process "rot13-filter.pl clean smudge" &&
	rm -rf repo &&
	mkdir repo &&
	(
	cd repo &&
	git init &&

	echo "*.r filter=protocol" >.gitattributes &&

	cp "$TEST_ROOT/test.o" test.r &&
	cp "$TEST_ROOT/test2.o" test2.r &&
	echo "this is going to fail" >smudge-write-fail.o &&
	cp smudge-write-fail.o smudge-write-fail.r &&

	S=$(file_size test.r) &&
	S2=$(file_size test2.r) &&
	SF=$(file_size smudge-write-fail.r) &&

	git add . &&
	rm -f *.r &&

	rm -f rot13-filter.log &&
	git checkout --quiet --no-progress . 2>git-stderr.log &&

	grep "smudge write error at" git-stderr.log &&
	grep "error: external filter" git-stderr.log &&

	cat >expected.log <<-EOF &&
	START
	init handshake complete
	IN: smudge smudge-write-fail.r $SF [OK] -- OUT: $SF [WRITE FAIL]
	START
	init handshake complete
	IN: smudge test.r $S [OK] -- OUT: $S . [OK]
	IN: smudge test2.r $S2 [OK] -- OUT: $S2 . [OK]
	STOP
	EOF
	test_cmp_exclude_clean expected.log rot13-filter.log &&

	test_cmp_committed_rot13 "$TEST_ROOT/test.o" test.r &&
	test_cmp_committed_rot13 "$TEST_ROOT/test2.o" test2.r &&

	# Smudge failed
	! test_cmp smudge-write-fail.o smudge-write-fail.r &&
	rot13.sh <smudge-write-fail.o >expected &&
	git cat-file blob :smudge-write-fail.r >actual &&
	test_cmp expected actual
	)
	'

	test_expect_success PERL 'process filter should not be restarted if it signals an error' '
	test_config_global filter.protocol.process "rot13-filter.pl clean smudge" &&
	rm -rf repo &&
	mkdir repo &&
	(
	cd repo &&
	git init &&

	echo "*.r filter=protocol" >.gitattributes &&

	cp "$TEST_ROOT/test.o" test.r &&
	cp "$TEST_ROOT/test2.o" test2.r &&
	echo "this will cause an error" >error.o &&
	cp error.o error.r &&

	S=$(file_size test.r) &&
	S2=$(file_size test2.r) &&
	SE=$(file_size error.r) &&

	git add . &&
	rm -f *.r &&

	filter_git checkout --quiet --no-progress . &&
	cat >expected.log <<-EOF &&
	START
	init handshake complete
	IN: smudge error.r $SE [OK] -- OUT: 0 [ERROR]
	IN: smudge test.r $S [OK] -- OUT: $S . [OK]
	IN: smudge test2.r $S2 [OK] -- OUT: $S2 . [OK]
	STOP
	EOF
	test_cmp_exclude_clean expected.log rot13-filter.log &&

	test_cmp_committed_rot13 "$TEST_ROOT/test.o" test.r &&
	test_cmp_committed_rot13 "$TEST_ROOT/test2.o" test2.r &&
	test_cmp error.o error.r
	)
	'

	test_expect_success PERL 'process filter abort stops processing of all further files' '
	test_config_global filter.protocol.process "rot13-filter.pl clean smudge" &&
	rm -rf repo &&
	mkdir repo &&
	(
	cd repo &&
	git init &&

	echo "*.r filter=protocol" >.gitattributes &&

	cp "$TEST_ROOT/test.o" test.r &&
	cp "$TEST_ROOT/test2.o" test2.r &&
	echo "error this blob and all future blobs" >abort.o &&
	cp abort.o abort.r &&

	SA=$(file_size abort.r) &&

	git add . &&
	rm -f *.r &&

	# Note: This test assumes that Git filters files in alphabetical
	# order ("abort.r" before "test.r").
	filter_git checkout --quiet --no-progress . &&
	cat >expected.log <<-EOF &&
	START
	init handshake complete
	IN: smudge abort.r $SA [OK] -- OUT: 0 [ABORT]
	STOP
	EOF
	test_cmp_exclude_clean expected.log rot13-filter.log &&

	test_cmp "$TEST_ROOT/test.o" test.r &&
	test_cmp "$TEST_ROOT/test2.o" test2.r &&
	test_cmp abort.o abort.r
	)
	'

	test_expect_success PERL 'invalid process filter must fail (and not hang!)' '
	test_config_global filter.protocol.process cat &&
	test_config_global filter.protocol.required true &&
	rm -rf repo &&
	mkdir repo &&
	(
	cd repo &&
	git init &&

	echo "*.r filter=protocol" >.gitattributes &&

	cp "$TEST_ROOT/test.o" test.r &&
	test_must_fail git add . 2>git-stderr.log &&
	grep "does not support filter protocol version" git-stderr.log
	)
	'

	test_done