add --no-filters option to git hash-object

The new option allows the contents to be hashed as is, ignoring any input
filter that would have been chosen by the attributes mechanism.

This option is incompatible with --path and --stdin-paths options.

Signed-off-by: Dmitry Potapov <dpotapov@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/t/t1007-hash-object.sh b/t/t1007-hash-object.sh
index f3972a7..fcdd15a 100755
--- a/t/t1007-hash-object.sh
+++ b/t/t1007-hash-object.sh
@@ -65,6 +65,14 @@
 	echo example | test_must_fail git hash-object --stdin-paths --path=foo
 '
 
+test_expect_success "Can't use --stdin-paths with --no-filters" '
+	echo example | test_must_fail git hash-object --stdin-paths --no-filters
+'
+
+test_expect_success "Can't use --path with --no-filters" '
+	test_must_fail git hash-object --no-filters --path=foo
+'
+
 # Behavior
 
 push_repo
@@ -117,6 +125,22 @@
 	git config --unset core.autocrlf
 '
 
+test_expect_success 'check that --no-filters option works' '
+	echo fooQ | tr Q "\\015" >file0 &&
+	cp file0 file1 &&
+	echo "file0 -crlf" >.gitattributes &&
+	echo "file1 crlf" >>.gitattributes &&
+	git config core.autocrlf true &&
+	file0_sha=$(git hash-object file0) &&
+	file1_sha=$(git hash-object file1) &&
+	test "$file0_sha" != "$file1_sha" &&
+	nofilters_file1=$(git hash-object --no-filters file1) &&
+	test "$file0_sha" = "$nofilters_file1" &&
+	nofilters_file1=$(cat file1 | git hash-object --stdin) &&
+	test "$file0_sha" = "$nofilters_file1" &&
+	git config --unset core.autocrlf
+'
+
 pop_repo
 
 for args in "-w --stdin" "--stdin -w"; do