Create a minimal Fedora Rawhide guest

Create a Fedora 20 guest from scratch using virt-builder , fully update it, and install a couple of packages:

$ virt-builder fedora-20 -o rawhide.qcow2 --format qcow2 \
  --update --selinux-relabel --size 40G\
  --install "fedora-release-rawhide yum-utils"

[UPDATE: Starting Fedora-21, fedora-release-rawhide package is renamed by fedora-repos-rawhide.]

Import the disk image into libvirt:

$ virt-install --name rawhide --ram 4096 --disk \
  path=/home/kashyapc/rawhide.qcow2,format=qcow2,cache=none \
  --import

Login via serial console into the guest, upgrade to Rawhide:

$ yum-config-manager --disable fedora updates updates-testing
$ yum-config-manager --enable rawhide
$ yum --releasever=rawhide distro-sync --nogpgcheck
$ reboot

Optionally, create a QCOW2 internal snapshot (live or offline) of the guest:

$ virsh snapshot-create-as rawhide snap1 \
  "Clean Rawhide 19MAR2014"

Here are a couple of methods on how to upgrade to Rawhide

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