Fix QEMU ARGV detection with kvm >= 85

ChangeLog

+Mon May 11 16:15:22 BST 2009 Daniel P. Berrange <berrange@redhat.com>
+
+	Fix QEMU ARGV detection with kvm >= 85
+	* src/qemu_conf.c: Increase limit on QEMU -help output size.
+	Improve error reporting when handling help output
+	* src/qemu_driver.c: Don't overwrite errors when extracting
+	QEMU versio ninfo
+
 Mon May 11 15:55:22 BST 2009 Daniel P. Berrange <berrange@redhat.com>
 
 	* src/virsh.c: Report detailed error if initial connection open

src/qemu_conf.c

@@ -431,18 +431,28 @@ int qemudExtractVersionInfo(const char *qemu,
         return -1;
 
     char *help = NULL;
-    enum { MAX_HELP_OUTPUT_SIZE = 8192 };
+    enum { MAX_HELP_OUTPUT_SIZE = 1024*64 };
     int len = virFileReadLimFD(newstdout, MAX_HELP_OUTPUT_SIZE, &help);
-    if (len < 0)
+    if (len < 0) {
+        virReportSystemError(NULL, errno, "%s",
+                             _("Unable to read QEMU help output"));
         goto cleanup2;
+    }
 
     if (sscanf(help, "QEMU PC emulator version %u.%u.%u (kvm-%u)",
                &major, &minor, &micro, &kvm_version) != 4)
         kvm_version = 0;
 
-    if (!kvm_version && sscanf(help, "QEMU PC emulator version %u.%u.%u",
-               &major, &minor, &micro) != 3)
+    if (!kvm_version &&
+        sscanf(help, "QEMU PC emulator version %u.%u.%u",
+               &major, &minor, &micro) != 3) {
+        char *eol = strchr(help, '\n');
+        if (eol) *eol = '\0';
+        qemudReportError(NULL, NULL, NULL, VIR_ERR_INTERNAL_ERROR,
+                         _("cannot parse QEMU version number in '%s'"),
+                         help);
         goto cleanup2;
+    }
 
     version = (major * 1000 * 1000) + (minor * 1000) + micro;
 

src/qemu_driver.c

@@ -1391,12 +1391,8 @@ static int qemudStartVMDaemon(virConnectPtr conn,
 
     if (qemudExtractVersionInfo(emulator,
                                 NULL,
-                                &qemuCmdFlags) < 0) {
-        qemudReportError(conn, NULL, NULL, VIR_ERR_INTERNAL_ERROR,
-                         _("Cannot determine QEMU argv syntax %s"),
-                         emulator);
+                                &qemuCmdFlags) < 0)
         goto cleanup;
-    }
 
     if (qemuPrepareHostDevices(conn, vm->def) < 0)
         goto cleanup;
@@ -3715,12 +3711,8 @@ static int qemudDomainChangeEjectableMedia(virConnectPtr conn,
 
     if (qemudExtractVersionInfo(vm->def->emulator,
                                 NULL,
-                                &qemuCmdFlags) < 0) {
-        qemudReportError(conn, dom, NULL, VIR_ERR_INTERNAL_ERROR,
-                         _("Cannot determine QEMU argv syntax %s"),
-                         vm->def->emulator);
+                                &qemuCmdFlags) < 0)
         return -1;
-    }
 
     if (qemuCmdFlags & QEMUD_CMD_FLAG_DRIVE) {
         if (!(devname = qemudDiskDeviceName(conn, newdisk)))