Provide configure option to disable tests

Building the tests is enabled by default, but because the test suite
requires root privileges to run at the moment, people should have to
option to disable the tests entirely.

Signed-off-by: Patrick McCarty <patrick.mccarty@intel.com>

Makefile.am

@@ -103,9 +103,11 @@ install-exec-hook:
 	perl findstatic.pl */*.o | grep -v Checking ||:
 
 TEST_EXTENSIONS = .sh
+if ENABLE_TESTS
 TESTS = $(dist_check_SCRIPTS)
 dist_check_SCRIPTS = \
 	test/run.sh
+endif
 
 release:
 	@git rev-parse v$(PACKAGE_VERSION) &> /dev/null; \

configure.ac

@@ -33,6 +33,11 @@ AS_IF([test "$enable_lzma" != "no"], [
 ])
 AM_CONDITIONAL([ENABLE_LZMA], [test "$enable_lzma" != "no"])
 
+AC_ARG_ENABLE(
+  [tests],
+  [AS_HELP_STRING([--disable-tests], [Do not enable functional tests (enabled by default)])]
+)
+
 have_coverage=no
 AC_ARG_ENABLE(coverage, AS_HELP_STRING([--enable-coverage], [enable test coverage]))
 if test "x$enable_coverage" = "xyes" ; then
@@ -52,6 +57,13 @@ if test "x$enable_coverage" = "xyes" ; then
 fi
 AM_CONDITIONAL([COVERAGE], [test "$have_coverage" = "yes"])
 
+AS_IF([test "$enable_tests" != "no"], [
+  AC_PATH_PROG([have_valgrind], [valgrind])
+  AS_IF([test -z "${have_valgrind}"], [
+    AC_MSG_ERROR([Must have valgrind installed to run functional tests])
+  ])
+])
+AM_CONDITIONAL([ENABLE_TESTS], [test "$enable_tests" != "no"])
 
 AC_CONFIG_FILES([Makefile data/bsdiff.pc])
 AC_OUTPUT