tests: introduce strip_header() helper function

This means that we can avoid hardcoding the number of headers we expect
CGit to generate in test cases and simply remove whatever headers happen
to by there when we are checking body content.

Signed-off-by: John Keeping <john@keeping.me.uk>

tests/setup.sh

@@ -98,4 +98,12 @@ cgit_url()
 	CGIT_CONFIG="$PWD/cgitrc" QUERY_STRING="url=$1" cgit
 }
 
+strip_headers () {
+	while read -r line
+	do
+		test -z "$line" && break
+	done
+	cat
+}
+
 test -z "$CGIT_TEST_NO_CREATE_REPOS" && setup_repos

tests/t0107-snapshot.sh

@@ -16,7 +16,7 @@ test_expect_success 'check html headers' '
 '
 
 test_expect_success 'strip off the header lines' '
-	tail -n +6 tmp > master.tar.gz
+	strip_headers <tmp >master.tar.gz
 '
 
 test_expect_success 'verify gzip format' '
@@ -51,7 +51,7 @@ test_expect_success 'check HTML headers (zip)' '
 '
 
 test_expect_success 'strip off the header lines (zip)' '
-	tail -n +6 tmp >master.zip
+	strip_headers <tmp >master.zip
 '
 
 if test -n "$(which unzip 2>/dev/null)"; then