dom0: fallback to zenity when kdialog not available

This can be the case on Xfce.

dom0/restore/qfile-daemon-dvm

@@ -46,7 +46,10 @@ class QfileDaemonDvm:
             qmemman_client.close()
             errmsg = 'Not enough memory to create DVM. '
             errmsg +='Terminate some appVM and retry.'
+            if os.path.exists('/usr/bin/kdialog'):
                 subprocess.call(['/usr/bin/kdialog', '--sorry', errmsg])
+            else:
+                subprocess.call(['/usr/bin/zenity', '--warning', errmsg])
             return None
 
         self.tray_notify("Starting new DispVM...")
@@ -74,7 +77,10 @@ class QfileDaemonDvm:
             '-l', str(label.index)])
         qmemman_client.close()
         if retcode != 0:
+            if os.path.exists('/usr/bin/kdialog'):
                 subprocess.call(['/usr/bin/kdialog', '--sorry', 'DisposableVM creation failed, see qubes_restore.log'])
+            else:
+                subprocess.call(['/usr/bin/zenity', '--warning', 'DisposableVM creation failed, see qubes_restore.log'])
             qvm_collection.unlock_db()
             return None
         f = open('/var/run/qubes/dispVM_xid', 'r');

dom0/restore/qubes_update_dispvm_savefile_with_progress.sh

@@ -1,19 +1,29 @@
 #!/bin/sh
 
-ref=`kdialog --title="Updating default DispVM savefile" \
---progressbar \
+line1="<b>Please wait (up to 120s) while the DispVM savefile is being updated.</b>"
+line2="<i><small>This only happens when you have updated the template.</small></i>"
+line3="<i><small>Next time will be much faster.</small></i>"
+
+if type kdialog &> /dev/null; then
+    ref=`kdialog --title="Updating default DispVM savefile" \
+        --progressbar \
 "<center>
     <font>
-        <b>Please wait (up to 120s) while the DispVM savefile is being updated.</b>
-        <br>
-        <i><small>
-            This only happens when you have updated the template.<br>
-            Next time will be much faster.
-        </small></i>
+        $line1<br>
+        $line2<br>
+        $line3
     </font>
 </center>" 0`;
 
-trap "qdbus $ref close" EXIT
+    trap "qdbus $ref close" EXIT
+else
+    pipe=/tmp/qvm-create-default-dvm-$$.progress
+    mkfifo $pipe
+    zenity --progress --pulsate --auto-close --text "$line1\n$line2\n$line3" < $pipe &
+    exec 5>$pipe
+    echo 0 >&5
+    trap "echo 100 >&5" EXIT
+fi
 
 #qdbus $ref showCancelButton true;
 

qrexec/qrexec_daemon.c

@@ -94,10 +94,16 @@ int ask_on_connect_timeout(int xid, int timeout)
 {
 	char text[1024];
 	int ret;
+	struct stat buf;
+	ret=stat("/usr/bin/kdialog", &buf);
+#define KDIALOG_CMD "kdialog --title 'Qrexec daemon' --warningyesno "
+#define ZENITY_CMD "zenity --title 'Qrexec daemon' --question --text "
 	snprintf(text, sizeof(text),
-			"kdialog --title 'Qrexec daemon' --warningyesno "
+			ret==0 ? KDIALOG_CMD : ZENITY_CMD
 			"'Timeout while trying connecting to qrexec agent (Xen domain ID: %d). Do you want to wait next %d seconds?'",
 			xid, timeout);
+#undef KDIALOG_CMD
+#undef ZENITY_CMD
 	ret = system(text);
 	ret = WEXITSTATUS(ret);
 	//              fprintf(stderr, "ret=%d\n", ret);