discover: Change parsers to explicitly request configuration files

Add a new function parser_request_url() to read the data from
configuration files present remotely. We deprecate
iterate_parser_files() and download_config() functions along with the
'filenames' and 'method' members of the 'parser' structure so that
individual parsers would now require to request the configuration files
data from the parser code and doesn't necessarily export the list of
configuration files.

Add the support to handle incoming DHCP event, done by passing all the
relevant environment variables of the udhcpc to the discover code.
Also, update the pxe parser code to populate the list of configuration
file names as per PXELINUX convention of fallback names using mac and ip
addresses of the booting machine.

Signed-off-by: Neelesh Gupta <neelegup@linux.vnet.ibm.com>
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>

1 files changed, 18 insertions, 6 deletions

diff --git a/discover/grub2/grub2.c b/discover/grub2/grub2.c
index 22d42df..9a46127 100644
--- a/discover/grub2/grub2.c
+++ b/discover/grub2/grub2.c
@@ -86,24 +86,36 @@ bool resolve_grub2_resource(struct device_handler *handler,
 	return true;
 }
 
-static int grub2_parse(struct discover_context *dc, char *buf, int len)
-{
+static int grub2_parse(struct discover_context *dc)
+	{
+	const char * const *filename;
 	struct grub2_parser *parser;
+	int len, rc;
+	char *buf;
+
+	/* Support block device boot only at present */
+	if (dc->event)
+		return -1;
 
 	parser = grub2_parser_create(dc);
 
-	grub2_parser_parse(parser, buf, len);
+	for (filename = grub2_conf_files; *filename; filename++) {
+		rc = parser_request_file(dc, dc->device, *filename, &buf, &len);
+		if (rc)
+			continue;
+
+		grub2_parser_parse(parser, buf, len);
+		talloc_free(buf);
+	}
 
 	talloc_free(parser);
 
-	return 1;
+	return 0;
 }
 
 static struct parser grub2_parser = {
 	.name			= "grub2",
-	.method			= CONF_METHOD_LOCAL_FILE,
 	.parse			= grub2_parse,
-	.filenames		= grub2_conf_files,
 	.resolve_resource	= resolve_grub2_resource,
 };