virt-install: If virt-viewer will fail, default to --wait -1

This can happen if user requests explicit --graphics, but they are on
a headless display. We had a few reports of this recently.

virt-convert

@@ -96,7 +96,6 @@ def main(conn=None):
         options.dry = True
         options.quiet = True
 
-    conscb = options.autoconsole and cli.show_console_for_guest or None
     print_cb = print_stdout
     if options.quiet:
         print_cb = None
@@ -109,6 +108,10 @@ def main(conn=None):
 
         guest = converter.get_guest()
 
+        conscb = None
+        if options.autoconsole:
+            conscb = cli.get_console_cb(guest) or None
+
         if options.xmlonly:
             print_stdout(guest.start_install(return_xml=True)[1],
                 do_force=True)

virt-install

@@ -675,9 +675,10 @@ def start_install(guest, continue_inst, options):
     # waiting.  Otherwise, we can exit before the domain has finished
     # installing. Passing --wait will give the above semantics.
     #
+    if options.wait is None:
         wait_on_install = continue_inst
         wait_time = -1
-    if options.wait is not None:
+    else:
         wait_on_install = True
         wait_time = options.wait * 60
 
@@ -686,10 +687,25 @@ def start_install(guest, continue_inst, options):
     # expires
     wait_on_console = not wait_on_install
 
+    if wait_time == 0:
         # --wait 0 implies --noautoconsole
-    options.autoconsole = (wait_time != 0) and options.autoconsole or False
+        autoconsole = False
+    else:
+        autoconsole = options.autoconsole
+
+    conscb = None
+    if autoconsole:
+        conscb = cli.get_console_cb(guest)
+        if not conscb:
+            # If there isn't any console to actually connect up,
+            # default to --wait -1 to get similarish behavior
+            autoconsole = False
+            if options.wait is None:
+                logging.warning(_("No console to launch for the guest, "
+                    "defaulting to --wait -1"))
+                wait_on_install = True
+                wait_time = -1
 
-    conscb = options.autoconsole and cli.show_console_for_guest or None
     meter = (options.quiet and
              progress.BaseMeter() or
              progress.TextMeter(fo=sys.stdout))

virtinst/cli.py

@@ -383,12 +383,8 @@ def _gfx_console(guest):
             "--connect", guest.conn.uri,
             "--wait", guest.name]
 
-    if not os.path.exists(args[0]):
-        logging.warn(_("Unable to connect to graphical console: "
-                       "virt-viewer not installed. Please install "
-                       "the 'virt-viewer' package."))
-        return None
-
+    logging.debug("Launching virt-viewer for graphics type '%s'",
+        guest.get_devices("graphics")[0].type)
     return _run_console(args)
 
 
@@ -397,6 +393,7 @@ def _txt_console(guest):
             "--connect", guest.conn.uri,
             "console", guest.name]
 
+    logging.debug("Connecting to text console")
     return _run_console(args)
 
 
@@ -419,22 +416,31 @@ def connect_console(guest, consolecb, wait):
         logging.debug("waitpid: %s: %s", e.errno, e.message)
 
 
-def show_console_for_guest(guest):
-    gdev = guest.get_devices("graphics")
-    if not gdev:
-        logging.debug("Connecting to text console")
-        return _txt_console(guest)
+def get_console_cb(guest):
+    gdevs = guest.get_devices("graphics")
+    if not gdevs:
+        return _txt_console
 
-    gtype = gdev[0].type
-    if gtype in ["default",
+    gtype = gdevs[0].type
+    if gtype not in ["default",
         VirtualGraphics.TYPE_VNC,
         VirtualGraphics.TYPE_SPICE]:
-        logging.debug("Launching virt-viewer for graphics type '%s'", gtype)
-        return _gfx_console(guest)
-    else:
         logging.debug("No viewer to launch for graphics type '%s'", gtype)
+        return
+
+    if not os.path.exists("/usr/bin/virt-viewer"):
+        logging.warn(_("Unable to connect to graphical console: "
+                       "virt-viewer not installed. Please install "
+                       "the 'virt-viewer' package."))
         return None
 
+    if not os.environ.get("DISPLAY", ""):
+        logging.warn(_("Graphics requested but DISPLAY is not set. "
+                       "Not running virt-viewer."))
+        return None
+
+    return _gfx_console
+
 
 ###########################
 # Common CLI option/group #