[ovirt-users] oVirt NGN image customization troubles

Hi all, I'm trying to modify the oVirt NGN image (to add RPMs, since imgbased rpmpersistence currently seems to have a bug: https://bugzilla.redhat.com/show_bug.cgi?id=1528468 ) but I'm unfortunately stuck at the very beginning: it seems that I'm unable to recreate even the standard 4.1 squashfs image. I'm following the instructions at https://gerrit.ovirt.org/gitweb?p=ovirt-node-ng.git;a=blob;f=README I'm working inside a CentOS7 fully-updated vm (hosted inside VMware, with nested virtualization enabled). I'm trying to work on the 4.1 branch, so I issued a: ./autogen.sh --with-ovirt-release-rpm-url=http://resources.ovirt.org/pub/yum-repo/ovirt-release41.rpm And after that I'm stuck in the "make squashfs" step: it never ends (keeps printing dots forever with no errors/warnings in log messages nor any apparent activity on the virtual disk image). Invoking it in debug mode and connecting to the VNC console shows the detailed Plymouth startup listing stuck (latest messages displayed: "Starting udev Wait for Complete Device Initialization..." and "Starting Device-Mapper Multipath Device Controller...") I wonder if it's actually supposed to be run only from a recent Fedora (the "dnf" reference seems a good indicator): if so, which version? I kindly ask for advice: has anyone succeeded in modifying/reproducing NGN squash images recently? If so, how? :-) Many thanks in advance, Giuseppe