cvs tests: do not touch test CVS repositories shipped with source

Some tests in t96xx series (cvsimport) want to write into the control area
(CVSROOT) of their test CVS repositories, but this does not work well when
the source area is made read-only (test trash directories are moved via
--root=else/where option).

Copy the supplied test CVS repository to a scratch place at the beginning
of these tests.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/Makefile

@@ -29,7 +29,6 @@ pre-clean:
 
 clean:
 	$(RM) -r 'trash directory'.* test-results
-	$(RM) t????/cvsroot/CVSROOT/?*
 	$(RM) -r valgrind/bin
 	$(RM) .prove
 

t/lib-cvs.sh

@@ -30,6 +30,12 @@ case "$cvsps_version" in
 	;;
 esac
 
+setup_cvs_test_repository () {
+	CVSROOT="$(pwd)/.cvsroot" &&
+	cp -r "$TEST_DIRECTORY/$1/cvsroot" "$CVSROOT" &&
+	export CVSROOT
+}
+
 test_cvs_co () {
 	# Usage: test_cvs_co BRANCH_NAME
 	rm -rf module-cvs-"$1"

t/t9601-cvsimport-vendor-branch.sh

@@ -34,10 +34,7 @@
 test_description='git cvsimport handling of vendor branches'
 . ./lib-cvs.sh
 
-test_expect_success PERL 'setup CVSROOT' '
-	CVSROOT="$TEST_DIRECTORY"/t9601/cvsroot &&
-	export CVSROOT
-'
+setup_cvs_test_repository t9601
 
 test_expect_success PERL 'import a module with a vendor branch' '
 

t/t9602-cvsimport-branches-tags.sh

@@ -6,10 +6,7 @@
 test_description='git cvsimport handling of branches and tags'
 . ./lib-cvs.sh
 
-test_expect_success PERL 'setup CVSROOT' '
-	CVSROOT="$TEST_DIRECTORY"/t9602/cvsroot &&
-	export CVSROOT
-'
+setup_cvs_test_repository t9602
 
 test_expect_success PERL 'import module' '
 

t/t9603-cvsimport-patchsets.sh

@@ -14,8 +14,7 @@
 test_description='git cvsimport testing for correct patchset estimation'
 . ./lib-cvs.sh
 
-CVSROOT="$TEST_DIRECTORY"/t9603/cvsroot
-export CVSROOT
+setup_cvs_test_repository t9603
 
 test_expect_failure 'import with criss cross times on revisions' '