core: add offline mode to qvm-create, qvm-prefs

This is required to create VMs in process of building Live system, where
libvirt isn't running.

Additionally there is no udev in the build environment, so needs to
manually create /dev/loop*p* based on sysfs info.

core-modules/000QubesVm.py

@@ -848,6 +848,8 @@ class QubesVm(object):
         return True
 
     def is_running(self):
+        if vmm.offline_mode:
+            return False
         try:
             if self.libvirt_domain.isActive():
                 return True
@@ -1192,7 +1194,10 @@ class QubesVm(object):
             shutil.copy(self.label.icon_path, self.icon_path)
 
         # Make sure that we have UUID allocated
-        self._update_libvirt_domain()
+        if not vmm.offline_mode:
+            self._update_libvirt_domain()
+        else:
+            self.uuid = uuid.uuid4()
 
         # fire hooks
         for hook in self.hooks_create_on_disk:

core-modules/006QubesProxyVm.py

@@ -58,6 +58,8 @@ class QubesProxyVm(QubesNetVm):
     def _set_netvm(self, new_netvm):
         old_netvm = self.netvm
         super(QubesProxyVm, self)._set_netvm(new_netvm)
+        if vmm.offline_mode:
+            return
         if self.netvm is not None:
             self.netvm.add_external_ip_permission(self.get_xid())
         self.write_netvm_domid_entry()

linux/aux-tools/prepare-volatile-img.sh

@@ -29,6 +29,18 @@ EOF
 
 loopdev=`losetup -f --show --partscan "$FILENAME"`
 udevadm settle
+created=
+if [ ! -e ${loopdev}p1 ]; then
+	# device wasn't created automatically, probably udev isn't running;
+	# create devs manually
+	for partdev in /sys/block/$(basename ${loopdev})/loop*p*; do
+		mknod /dev/$(basename ${partdev}) b $(cat ${partdev}/dev | tr : ' ')
+	done
+	created=yes
+fi
 mkswap -f ${loopdev}p1 > /dev/null
+if [ "$created" = "yes" ]; then
+	rm -f ${loopdev}p*
+fi
 losetup -d ${loopdev} || :
 chown --reference `dirname "$FILENAME"` "$FILENAME"

qvm-tools/qubes-prefs

@@ -28,6 +28,8 @@ from optparse import OptionParser
 import subprocess
 import os
 import sys
+from qubes.qubes import vmm
+
 
 def handle_vm(vms, label, new_value = None):
     functions = { # label: [ getter, setter ],
@@ -116,6 +118,8 @@ def main():
         else:
             options.do_set = True
 
+    vmm.offline_mode = True
+
     if options.do_set:
         qvm_collection = QubesVmCollection()
         qvm_collection.lock_db_for_writing()

qvm-tools/qvm-create

@@ -29,6 +29,8 @@ import subprocess
 import re
 import os
 import sys
+from qubes.qubes import vmm
+
 
 def main():
     usage = "usage: %prog [options] <vm-name>"
@@ -55,6 +57,9 @@ def main():
                         help="Initial memory size (in MB)")
     parser.add_option ("-c", "--vcpus", dest="vcpus", default=None,
                         help="VCPUs count")
+    parser.add_option ("--offline-mode", dest="offline_mode",
+                       action="store_true", default=False,
+                       help="Offline mode")
     parser.add_option ("-i", "--internal", action="store_true", dest="internal", default=False,
                         help="Create VM for internal use only (hidden in qubes-manager, no appmenus)")
     parser.add_option ("--force-root", action="store_true", dest="force_root", default=False,
@@ -118,6 +123,9 @@ def main():
         print >> sys.stderr, "File specified as root.img does not exists"
         exit (1)
 
+    if options.offline_mode:
+        vmm.offline_mode = True
+
     qvm_collection = QubesVmCollection()
     qvm_collection.lock_db_for_writing()
     qvm_collection.load()

qvm-tools/qvm-prefs

@@ -30,6 +30,8 @@ import subprocess
 import os
 import sys
 import re
+from qubes.qubes import vmm
+
 
 def do_list(vm):
     label_width = 19
@@ -541,6 +543,9 @@ def main():
     parser.add_option("--force-root", action="store_true", dest="force_root",
                       default=False,
                       help="Force to run, even with root privileges")
+    parser.add_option ("--offline-mode", dest="offline_mode",
+                       action="store_true", default=False,
+                       help="Offline mode")
 
     (options, args) = parser.parse_args ()
     if (len (args) < 1):
@@ -560,6 +565,9 @@ def main():
                              "the same time!"
         exit(1)
 
+    if options.offline_mode:
+        vmm.offline_mode = True
+
     if options.do_set:
         qvm_collection = QubesVmCollection()
         qvm_collection.lock_db_for_writing()