[Xen-changelog] [xen-unstable] xl: Allow use of /dev/null with xl create to enable command-line definition

[Xen patchbot-unstable <patchbot@xxxxxxx>]

# HG changeset patch
# User W. Michael Petullo <mike@xxxxxxxx>
# Date 1341413175 -3600
# Node ID 328f466f9ee6b8748c8af50090bb7ed12bf83ca5
# Parent  bb250383a4f57c4cd8a0b16bae8cacc686c16825
xl: Allow use of /dev/null with xl create to enable command-line definition

xm allows specifying /dev/null as the domain configuration argument to its
create option; add same functionality to xl. xl treats the configuration
argument /dev/null as a special case.  This allows specifying an entire
domain configuration on the command line.

Signed-off-by: W. Michael Petullo <mike@xxxxxxxx>
Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
[ ijc -- ported to xen-unstable from 4.1 ]
Committed-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---


diff -r bb250383a4f5 -r 328f466f9ee6 tools/libxl/xl_cmdimpl.c
--- a/tools/libxl/xl_cmdimpl.c  Wed Jul 04 15:46:14 2012 +0100
+++ b/tools/libxl/xl_cmdimpl.c  Wed Jul 04 15:46:15 2012 +0100
@@ -1697,10 +1697,15 @@ static int create_domain(struct domain_c
 
     if (config_file) {
         free(config_data);  config_data = 0;
-        ret = libxl_read_file_contents(ctx, config_file,
-                                       &config_data, &config_len);
-        if (ret) { fprintf(stderr, "Failed to read config file: %s: %s\n",
-                           config_file, strerror(errno)); return ERROR_FAIL; }
+        /* /dev/null represents special case (read config. from command line) 
*/
+        if (!strcmp(config_file, "/dev/null")) {
+            config_len = 0;
+        } else {
+            ret = libxl_read_file_contents(ctx, config_file,
+                                           &config_data, &config_len);
+            if (ret) { fprintf(stderr, "Failed to read config file: %s: %s\n",
+                               config_file, strerror(errno)); return 
ERROR_FAIL; }
+        }
         if (!restoring && extra_config && strlen(extra_config)) {
             if (config_len > INT_MAX - (strlen(extra_config) + 2 + 1)) {
                 fprintf(stderr, "Failed to attach extra configration\n");

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