xen/xl-check-for-libvirt-managed-domain.patch

Index: xen-4.4.0-testing/tools/libxl/xl.c
===================================================================
--- xen-4.4.0-testing.orig/tools/libxl/xl.c
+++ xen-4.4.0-testing/tools/libxl/xl.c
@@ -282,6 +282,44 @@ static void xl_ctx_free(void)
     }
 }
 
+/*
+  Return 0 if domain is managed by libvirt
+*/
+static int xl_lookup_libvirt_managed_domains(int argc, char **argv)
+{
+    FILE *fp;
+    int i;
+    char line[1024];
+    char *libvirt_sock = "/run/libvirt/libvirt-sock";
+
+    /* Check for the libvirt socket file */
+    if (access(libvirt_sock, F_OK) != 0) {
+        return 1;
+    }
+
+    /* Run virsh to get a list of running domains managed by libvirt */
+    fp = popen("/usr/bin/virsh list --name 2>&1", "r");
+    if (fp == NULL) {
+        return 1;
+    }
+
+    /* Read the list of domains looking for each name in the xl command */
+    while (fgets(line, sizeof(line)-1, fp) != NULL) {
+        line[strlen(line)-1] = '\0';
+        for (i=0; i<argc && line[0]; ++i) {
+            if (!strcmp(argv[i], line)) {
+                pclose(fp);
+                return 0;
+            }
+        }
+    }
+
+    pclose(fp);
+
+    /* Not found */
+    return 1;
+}
+
 int main(int argc, char **argv)
 {
     int opt = 0;
@@ -345,6 +383,18 @@ int main(int argc, char **argv)
             goto xit;
         }
         if (cspec->modifies && !dryrun_only) {
+            if (!force_execution) {
+                if (!xl_lookup_libvirt_managed_domains(argc, argv)) {
+                    fprintf(stderr,
+"Warning: This domain is managed by libvirt. Using xl commands to modify this\n"
+"domain will result in errors when virsh or virt-manager is used.\n"
+"Please use only virsh or virt-manager to manage this domain.\n\n"
+"(This check can be overridden with the -f option.)\n"
+                            );
+                    ret = 1;
+                    goto xit;
+                }
+            }
             for (int i = 0; i < sizeof(locks)/sizeof(locks[0]); i++) {
                 if (!access(locks[i], F_OK) && !force_execution) {
                     fprintf(stderr,