discover: Add support for checking directories in parser API
[petitboot] / discover / parser.c
index 6896075ed1742b82b4e9306a5b1072556c8463df..74b2559c8ab9776d138bddc7a8ea51ef9625351d 100644 (file)
@@ -22,113 +22,140 @@ struct p_item {
 STATIC_LIST(parsers);
 
 static char *local_path(struct discover_context *ctx,
+               struct discover_device *dev,
                const char *filename)
 {
-       return join_paths(ctx, ctx->device->mount_path, filename);
+       return join_paths(ctx, dev->mount_path, filename);
 }
 
-static int download_config(struct discover_context *ctx, char **buf, int *len)
+int parser_request_file(struct discover_context *ctx,
+               struct discover_device *dev, const char *filename,
+               char **buf, int *len)
+
 {
-       unsigned tempfile;
-       const char *file;
+       char *path;
        int rc;
 
-       file = load_url(ctx, ctx->conf_url, &tempfile);
-       if (!file)
+       /* we only support local files at present */
+       if (!dev->mount_path)
                return -1;
 
-       rc = read_file(ctx, file, buf, len);
-       if (rc)
-               goto out_clean;
+       path = local_path(ctx, dev, filename);
 
-       return 0;
+       rc = read_file(ctx, path, buf, len);
 
-out_clean:
-       if (tempfile)
-               unlink(file);
-       return -1;
+       talloc_free(path);
+
+       return rc;
 }
 
-static void iterate_parser_files(struct discover_context *ctx,
-               const struct parser *parser)
+int parser_check_dir(struct discover_context *ctx,
+               struct discover_device *dev, const char *dirname)
 {
-       const char * const *filename;
-       const char *path;
-
-       if (!parser->filenames)
-               return;
-
-       for (filename = parser->filenames; *filename; filename++) {
-               int rc, len;
-               char *buf;
-
-               path = local_path(ctx, *filename);
-               if (!path)
-                       continue;
-
-               rc = read_file(ctx, path, &buf, &len);
-               if (!rc) {
-                       pb_log("Running parser %s on file %s\n",
-                                       parser->name, *filename);
-                       parser->parse(ctx, buf, len);
-                       talloc_free(buf);
-               }
-       }
+       struct stat statbuf;
+       char *path;
+       int rc;
+
+       if (!dev->mount_path)
+               return -1;
+
+       path = local_path(ctx, dev, dirname);
+
+       rc = stat(path, &statbuf);
+       if (!rc)
+               return -1;
+
+       return S_ISDIR(statbuf.st_mode) ? 0 : -1;
 }
 
-void iterate_parsers(struct discover_context *ctx, enum conf_method method)
+int parser_replace_file(struct discover_context *ctx,
+               struct discover_device *dev, const char *filename,
+               char *buf, int len)
 {
-       struct p_item* i;
-       int rc, len;
-       char *buf;
+       bool release;
+       char *path;
+       int rc;
 
-       pb_log("trying parsers for %s\n", ctx->device->device->id);
+       if (!dev->mounted)
+               return -1;
 
-       switch (method) {
-       case CONF_METHOD_LOCAL_FILE:
-               list_for_each_entry(&parsers, i, list) {
-                       if (i->parser->method != CONF_METHOD_LOCAL_FILE)
-                               continue;
+       rc = device_request_write(dev, &release);
+       if (rc) {
+               pb_log("Can't write file %s: device doesn't allow write\n",
+                               dev->device_path);
+               return -1;
+       }
 
-                       pb_log("\ttrying parser '%s'\n", i->parser->name);
-                       ctx->parser = i->parser;
-                       iterate_parser_files(ctx, ctx->parser);
-               }
-               ctx->parser = NULL;
-               break;
+       path = local_path(ctx, dev, filename);
 
-       case CONF_METHOD_DHCP:
-               rc = download_config(ctx, &buf, &len);
-               if (rc) {
-                       pb_log("\tdownload failed, aborting\n");
-                       return;
-               }
+       rc = replace_file(path, buf, len);
 
-               list_for_each_entry(&parsers, i, list) {
-                       if (i->parser->method != method)
-                               continue;
+       talloc_free(path);
 
-                       pb_log("\ttrying parser '%s'\n", i->parser->name);
-                       ctx->parser = i->parser;
-                       i->parser->parse(ctx, buf, len);
-               }
+       device_release_write(dev, release);
 
-               break;
+       return rc;
+}
 
-       case CONF_METHOD_UNKNOWN:
-               break;
+int parser_request_url(struct discover_context *ctx, struct pb_url *url,
+               char **buf, int *len)
+{
+       struct load_url_result *result;
+       int rc;
+
+       result = load_url(ctx, url);
+       if (!result)
+               goto out;
 
+       rc = read_file(ctx, result->local, buf, len);
+       if (rc) {
+               pb_log("Read failed for the parser %s on file %s\n",
+                               ctx->parser->name, result->local);
+               goto out_clean;
        }
+
+       return 0;
+
+out_clean:
+       if (result->cleanup_local)
+               unlink(result->local);
+out:
+       return -1;
 }
 
+void iterate_parsers(struct discover_context *ctx)
+{
+       struct p_item* i;
+
+       pb_log("trying parsers for %s\n", ctx->device->device->id);
+
+       list_for_each_entry(&parsers, i, list) {
+               pb_debug("\ttrying parser '%s'\n", i->parser->name);
+               ctx->parser = i->parser;
+               i->parser->parse(ctx);
+       }
+       ctx->parser = NULL;
+}
+
+static void *parsers_ctx;
+
 void __register_parser(struct parser *parser)
 {
-       struct p_item* i = talloc(NULL, struct p_item);
+       struct p_item *i;
+
+       if (!parsers_ctx)
+               parsers_ctx = talloc_new(NULL);
 
+       i = talloc(parsers_ctx, struct p_item);
        i->parser = parser;
        list_add(&parsers, &i->list);
 }
 
+static __attribute__((destructor)) void cleanup_parsers(void)
+{
+       talloc_free(parsers_ctx);
+}
+
 void parser_init(void)
 {
 }