Using "xl create" without domain config file

["W. Michael Petullo" <mike@flyn.org>]

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I found it useful to use xm without a domain configuration file:

	xm create /dev/null kernel=...

The xl command does not support this. See a previous thread I started:

	http://lists.xen.org/archives/html/xen-devel/2011-08/msg00330.html

I just found the time to modify xl so that it works without a domain
configuration file. For example:

	xl create kernel=\"...\" ...

Would it be possible to add this feature? The xl command already supports
augmenting a domain configuration file with additional information
from the command line. My changes just modify xl so that the entire
configuration may be specified on the command line.

To test this patch, run:

	1. xl create -c /path/to/config

	2. xl create -c /path/to/config someAdditionalDomainParam=\"value\"

	3. xl create -c kernel=\"/path/to/kernel\"

The third test covers the new case.

-- 
Mike

:wq

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diff -u --recursive --new-file xen-4.1.2-vanilla/tools/libxl/xl_cmdimpl.c xen-4.1.2/tools/libxl/xl_cmdimpl.c
--- xen-4.1.2-vanilla/tools/libxl/xl_cmdimpl.c	2011-10-20 12:05:43.000000000 -0500
+++ xen-4.1.2/tools/libxl/xl_cmdimpl.c	2012-05-30 23:37:51.261948881 -0500
@@ -1442,30 +1442,32 @@
                                        &config_data, &config_len);
         if (ret) { fprintf(stderr, "Failed to read config file: %s: %s\n",
                            config_file, strerror(errno)); return ERROR_FAIL; }
-        if (!restore_file && extra_config && strlen(extra_config)) {
-            if (config_len > INT_MAX - (strlen(extra_config) + 2 + 1)) {
-                fprintf(stderr, "Failed to attach extra configration\n");
-                return ERROR_FAIL;
-            }
-            /* allocate space for the extra config plus two EOLs plus \0 */
-            config_data = realloc(config_data, config_len
-                + strlen(extra_config) + 2 + 1);
-            if (!config_data) {
-                fprintf(stderr, "Failed to realloc config_data\n");
-                return ERROR_FAIL;
-            }
-            config_len += sprintf(config_data + config_len, "\n%s\n",
-                extra_config);
-        }
     } else {
-        if (!config_data) {
-            fprintf(stderr, "Config file not specified and"
+        if (!config_data && !extra_config) {
+            fprintf(stderr, "Domain config file not specified,"
+	            " none on command line, and"
                     " none in save file\n");
             return ERROR_INVAL;
         }
         config_file = "<saved>";
     }
 
+    if (!restore_file && extra_config && strlen(extra_config)) {
+        if (config_len > INT_MAX - (strlen(extra_config) + 2 + 1)) {
+            fprintf(stderr, "Failed to attach extra configration\n");
+            return ERROR_FAIL;
+        }
+        /* allocate space for the extra config plus two EOLs plus \0 */
+        config_data = realloc(config_data, config_len
+            + strlen(extra_config) + 2 + 1);
+        if (!config_data) {
+            fprintf(stderr, "Failed to realloc config_data\n");
+            return ERROR_FAIL;
+        }
+        config_len += sprintf(config_data + config_len, "\n%s\n",
+            extra_config);
+    }
+
     if (!dom_info->quiet)
         printf("Parsing config file %s\n", config_file);
 

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