discover/grub2: Fix handling of positional parameters

Positional parameters are set in the environment with '$' prepended to
the name.  This causes lookups to fail because parameter lookups don't
include the '$'.

TESTED:
 Added a test that covers positional parameters in GRUB2 parser.
 Build succeeds, tests pass.

Bootstrapped-by: Nancy Yuen <yuenn@google.com>
Signed-off-by: Alan Dunn <amdunn@google.com>
Signed-off-by: Sam Mendoza-Jonas <sam@mendozajonas.com>

2 files changed, 36 insertions, 0 deletions

diff --git a/test/parser/Makefile.am b/test/parser/Makefile.am
index e4f9b9c..9a6be6d 100644
--- a/test/parser/Makefile.am
+++ b/test/parser/Makefile.am
@@ -26,6 +26,7 @@ parser_TESTS = \
 	test/parser/test-grub2-multiple-resolve \
 	test/parser/test-grub2-multiple-id \
 	test/parser/test-grub2-single-line-if \
+	test/parser/test-grub2-pos-param \
 	test/parser/test-grub2-load-env \
 	test/parser/test-grub2-save-env \
 	test/parser/test-grub2-save-env-dash-f \
diff --git a/test/parser/test-grub2-pos-param.c b/test/parser/test-grub2-pos-param.c
new file mode 100644
index 0000000..09ac8fc
--- /dev/null
+++ b/test/parser/test-grub2-pos-param.c
@@ -0,0 +1,35 @@
+
+#include "parser-test.h"
+
+#if 0 /* PARSER_EMBEDDED_CONFIG */
+
+function set_params_var {
+	params="$1 $2"
+}
+menuentry 'Linux' {
+	set_params_var abc 123
+	linux   test_kernel $params
+}
+
+#endif
+
+void run_test(struct parser_test *test)
+{
+	struct discover_boot_option *opt;
+	struct discover_context *ctx;
+
+	test_read_conf_embedded(test, "/boot/grub/grub.cfg");
+
+	test_run_parser(test, "grub2");
+
+	ctx = test->ctx;
+
+	check_boot_option_count(ctx, 1);
+	opt = get_boot_option(ctx, 0);
+
+	check_name(opt, "Linux");
+	/* The linux command, $params is expected to have been set when
+	 * set_params was called in menuentry.
+	 */
+	check_args(opt, "abc 123");
+}