discover/grub2: implement 'source' command

This change add support for the grub2 'source' command, executing a
referenced script in the current parse context.

We impose a limit of 10 (concurrent) source commands, to prevent
infinite recursion.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>

1 files changed, 54 insertions, 0 deletions

diff --git a/test/parser/test-grub2-source.c b/test/parser/test-grub2-source.c
new file mode 100644
index 0000000..a14bef7
--- /dev/null
+++ b/test/parser/test-grub2-source.c
@@ -0,0 +1,54 @@
+
+/* check that we can source other scripts, and variables get passed
+ * in to and out of sourced scripts */
+
+#include "parser-test.h"
+
+#if 0 /* PARSER_EMBEDDED_CONFIG */
+
+menuentry a {
+	linux /a
+}
+
+# var: outer -> inner -> outer
+v=b
+
+source /grub/2.cfg
+
+menuentry $v {
+	linux /c
+}
+
+#endif
+
+void run_test(struct parser_test *test)
+{
+	struct discover_boot_option *opt;
+	struct discover_context *ctx;
+	struct discover_device *dev;
+
+	ctx = test->ctx;
+	dev = ctx->device;
+
+	test_read_conf_embedded(test, "/grub/grub.cfg");
+
+	test_add_file_string(test, dev,
+			"/grub/2.cfg",
+			"menuentry $v { linux /b }\nv=c\n");
+
+	test_run_parser(test, "grub2");
+
+	check_boot_option_count(ctx, 3);
+
+	opt = get_boot_option(ctx, 0);
+	check_name(opt, "a");
+	check_resolved_local_resource(opt->boot_image, dev, "/a");
+
+	opt = get_boot_option(ctx, 1);
+	check_name(opt, "b");
+	check_resolved_local_resource(opt->boot_image, dev, "/b");
+
+	opt = get_boot_option(ctx, 2);
+	check_name(opt, "c");
+	check_resolved_local_resource(opt->boot_image, dev, "/c");
+}