discover: Use device_handler_status_dev_* for device-specific status

[petitboot] / discover / parser.h

diff --git a/discover/parser.h b/discover/parser.h
index 9f98368b5ca417640e9c097d50674f3a71c924e5..fc165c5aeda494a9051b368a86f633d83dd4c0d8 100644 (file)
--- a/discover/parser.h
+++ b/discover/parser.h
@@ -1,11 +1,39 @@
 #ifndef _PARSER_H
 #define _PARSER_H
 
+#include <stdbool.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include "device-handler.h"
+
 struct discover_context;
+struct device_handler;
+struct resource;
 
+/**
+ * Our config parser.
+ *
+ * Each parser is responsible for creating discover_boot_options from config
+ * files found on new devices. The boot items discovered during parse will have
+ * 'resources' attached (see @discover_boot_option), which may already be
+ * resolved (in the case of a device-local filename, or a URL), or unresolved
+ * (in the case of a filename on another device).
+ *
+ * If the boot option contains references to unresolved resources, the
+ * device handler will not inform clients about the boot options, as
+ * they're not properly "available" at this stage. The handler will attempt to
+ * resolve them whenever new devices are discovered, by calling the parser's
+ * resolve_resource function. Once a boot option's resources are full resolved,
+ * the option can be sent to clients.
+ */
 struct parser {
-       char *name;
-       int (*parse)(struct discover_context *ctx);
+       char                    *name;
+       int                     (*parse)(struct discover_context *ctx);
+       bool                    (*resolve_resource)(
+                                               struct device_handler *handler,
+                                               struct resource *res);
 };
 
 enum generic_icon_type {
@@ -23,4 +51,30 @@ void parser_init(void);
 void iterate_parsers(struct discover_context *ctx);
 int parse_user_event(struct discover_context *ctx, struct event *event);
 
+/* File IO functions for parsers; these should be the only interface that
+ * parsers use to access a device's filesystem.
+ *
+ * These are intended for small amounts of data, typically text
+ * configuration and state files.  Note that parser_request_file,
+ * and parser_replace_file work only on non-directories.
+ */
+int parser_request_file(struct discover_context *ctx,
+               struct discover_device *dev, const char *filename,
+               char **buf, int *len);
+int parser_replace_file(struct discover_context *ctx,
+               struct discover_device *dev, const char *filename,
+               char *buf, int len);
+int parser_request_url(struct discover_context *ctx, struct pb_url *url,
+               char **buf, int *len);
+/* parser_stat_path returns 0 if path can be stated on dev by the
+ * running user.  Note that this function follows symlinks, like the
+ * stat system call.  When the function returns 0, also fills in
+ * statbuf for the path.  Returns non-zero on error.  This function
+ * does not have the limitations on file size that the functions above
+ * do.  Unlike some of the functions above, this function also works
+ * on directories. */
+int parser_stat_path(struct discover_context *ctx,
+               struct discover_device *dev, const char *path,
+               struct stat *statbuf);
+
 #endif /* _PARSER_H */