treecompose: Add ability to automatically detect atomic host IP

When creating imagefactory images, we now detect if there is a "default"
KVM network and if so, we grab its IP and dynamically substitute it into
the KS file.  This prevents a difficult to debug error for users who
use a different IP/subnet scheme on their KVM networks.

If we cannot detect the network and IP, we suggest the user static define
it in the KS file.

packaging/rpm-ostree-toolbox.spec.in: Added libvirt-python as a runtime
dependancy.

packaging/rpm-ostree-toolbox.spec.in

@@ -26,6 +26,7 @@ Requires: python
 Requires: python-iniparse
 Requires: pygobject2
 Requires: gjs
+Requires: libvirt-python
 Requires: libguestfs-tools-c
 Requires: libguestfs-gobject
 # Needed for libguests

scripts/ostree-ls-big-files.js

@@ -63,10 +63,19 @@ sizes.sort(function(a,b) {
 	return 0;
 });
 
-for (let i = 0; i < 100 && i < sizes.length; i++) {
+let total = 0;
+let max = 500;
+let i;
+for (i = 0; i < sizes.length; i++) {
     let [path,size] = sizes[i];
-    print("" + size + " " + path.get_path());
+    total += size;
+    if (i < max)
+	print("" + size + " " + path.get_path());
 }
+let rest = sizes.length - max;
+if (rest > 0)
+    print("...and " + rest + " more");
+print("total: " + total);
 
 
 

src/py/rpmostreecompose/imagefactory.py

@@ -26,6 +26,9 @@
 import distutils.spawn
 from gi.repository import Gio, OSTree, GLib
 from iniparse import INIConfig
+import libvirt
+import xml.etree.ElementTree as ET
+
 
 from imgfac.PersistentImageManager import PersistentImageManager
 
@@ -189,9 +192,11 @@ def create(self, outputdir, name, ksfile, tdl, imageouttypes):
 
         # TODO: Pull kickstart from separate git repo
         ksdata = open(flattened_ks).read()
+        host_ip = getDefaultIP() 
         substitutions = { 'OSTREE_PORT': httpd_port,
                           'OSTREE_REF':  self.ref,
-                          'OSTREE_OSNAME':  self.os_name }
+                          'OSTREE_OSNAME':  self.os_name,
+                          'OSTREE_HOST_IP': host_ip }
         for subname, subval in substitutions.iteritems():
             ksdata = ksdata.replace('@%s@' % (subname, ), subval)
 
@@ -257,6 +262,22 @@ def builder(self):
 
 ## End Composer
 
+def getDefaultIP():
+    """
+    This method determines returns the IP of the atomic host, which
+    is used by the kickstart file to find the atomic repository. If it
+    cannot determine it via the default KVM network, it will fatally
+    die and suggest the user define it in the KS file.
+    """
+    conn=libvirt.open()
+    try:
+        interface = conn.networkLookupByName("default")
+    except:
+        print "Unable to automatically determine your default KVM network. You can define the IP address of your atomic host repository in the kickstart file.  Simply replace @OSTREE_HOST_IP@ with the IP you want to use."
+        exit(1)
+    root = ET.fromstring(interface.XMLDesc())
+    ip = root.find("ip").get('address')
+    return ip
 
 def checkoz():
     """