configure: we don't need mako any more.

And guard the mako-specific tests with a check instead.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

configure

@@ -77,20 +77,18 @@ default_pytest()
     done
 }
 
-require()
+check_command()
 {
     name="$1"
-    resolution="$2"
-    shift 2
+    shift 1
 
     echo -n "checking for $name... "
     if "$@" 2>/dev/null; then
 	echo 'found'
-	return
+	return 0
     fi
     echo 'not found'
-    echo "$resolution" >&2
-    exit 1
+    return 1
 }
 
 default_valgrind_setting()
@@ -235,9 +233,6 @@ if [ "$ASAN" = "1" ]; then
     fi
 fi
 
-# Doesn't set a var, but makes sure it exists
-require 'python3-mako' "You need the mako module for python3: see doc/INSTALL.md" python3 -c 'import mako'
-
 SQLITE3_CFLAGS=""
 SQLITE3_LDLIBS="-lsqlite3"
 if command -v "${PKG_CONFIG}" >/dev/null; then
@@ -362,6 +357,13 @@ int main(void)
 }
 /*END*/
 EOF
+
+if check_command 'python3-mako' python3 -c 'import mako'; then
+    HAVE_PYTHON3_MAKO=1
+else
+    HAVE_PYTHON3_MAKO=0
+fi
+
 mv $CONFIG_VAR_FILE.$$ $CONFIG_VAR_FILE
 
 # Now we can finally set our warning flags
@@ -389,6 +391,7 @@ add_var PYTEST "$PYTEST"
 add_var STATIC "$STATIC"
 add_var ASAN "$ASAN"
 add_var TEST_NETWORK "$TEST_NETWORK"
+add_var HAVE_PYTHON3_MAKO "$HAVE_PYTHON3_MAKO"
 
 # Hack to avoid sha256 name clash with libwally: will be fixed when that
 # becomes a standalone shared lib.

tools/test/Makefile

@@ -5,6 +5,9 @@
 #
 # We generate the files, and then we attempt to compile
 # and run a test case.
+
+# We don't run these at all unless mako is installed.
+ifeq ($(HAVE_PYTHON3_MAKO),1)
 check-units: check-tools
 
 TOOL_TEST_INCL_SRC := tools/test/enum.c
@@ -49,6 +52,7 @@ tools/test/gen_print.c: $(TOOLS_WIRE_DEPS)
 ALL_TEST_PROGRAMS += $(TOOL_TEST_PROGRAMS)
 
 check-tools: $(TOOL_TEST_PROGRAMS:%=unittest/%)
+endif # HAVE_PYTHON3_MAKO
 
 update-mocks: tools-update-mocks