discover: Reimplement native-parser as a Bison parser

Occasionally you look at some code and realise that a) this never gets
built, and b) even if it did it would never compile. Today's example is
native-parser.c which we must have just assumed worked for quite a
while.

The native parser has bitrotted entirely and needs to be brought up to
date. While we're here, lets take the chance to implement a proper
grammar for it. This helps us reason more effectively about the parser,
lets us extend it easily in the future, and.. I wanted to write a Bison
parser too.

This implements most of the old functionality, but drops off some
smaller details like settings icons which needs some separate attention
to bring up to date.

Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com>

1 files changed, 55 insertions, 0 deletions

diff --git a/discover/native/native.c b/discover/native/native.c
new file mode 100644
index 0000000..964ad1d
--- /dev/null
+++ b/discover/native/native.c
@@ -0,0 +1,55 @@
+#include <assert.h>
+#include <string.h>
+#include <i18n/i18n.h>
+
+#include <talloc/talloc.h>
+#include <url/url.h>
+
+#include <discover/resource.h>
+#include <discover/parser.h>
+#include <discover/parser-utils.h>
+
+#include "native.h"
+
+static const char *const native_conf_files[] = {
+	"/boot/petitboot.conf",
+	"/petitboot.conf",
+	NULL
+};
+
+static int native_parse(struct discover_context *dc)
+{
+	const char * const *filename;
+	struct native_parser *parser;
+	int len, rc;
+	char *buf;
+
+	/* Support block device boot only at present */
+	if (dc->event)
+		return -1;
+
+	for (filename = native_conf_files; *filename; filename++) {
+		rc = parser_request_file(dc, dc->device, *filename, &buf, &len);
+		if (rc)
+			continue;
+
+		parser = native_parser_create(dc);
+		native_parser_parse(parser, *filename, buf, len);
+		device_handler_status_dev_info(dc->handler, dc->device,
+				_("Parsed native configuration from %s"),
+				*filename);
+		talloc_free(buf);
+		talloc_free(parser);
+		break;
+	}
+
+	return 0;
+}
+
+static struct parser native_parser = {
+	.name			= "native",
+	.parse			= native_parse,
+	.resolve_resource	= resolve_devpath_resource,
+};
+
+register_parser(native_parser);