[Libguestfs] Kernel panic with virt-builder etc.

[Richard W.M. Jones]

I've just built libguestfs (from git) on Ubuntu 13.10 and it
worked for me.  Here's what I did:

* Clone libguestfs from git:

git clone https://github.com/libguestfs/libguestfs.git
cd libguestfs

* Create a file called 'localconfigure' containing:

----------------------------------------------------------------------
. localenv
./autogen.sh \
  --prefix /usr \
  --libdir /usr/lib \
  --disable-static \
  --enable-gtk-doc \
  -C \
  "$@"
----------------------------------------------------------------------

* Create a file called 'localenv' containing:

----------------------------------------------------------------------
# NB: -*- Makefile -*- AND a shell script.

# Parallel test runs out of resources starting qemu, unclear why.
export SKIP_TEST_PARALLEL_MOUNT_LOCAL=1

# Fails under valgrind because cpio subprocess has a memory leak.
export SKIP_TEST_FILE_ARCHITECTURE_11=1
----------------------------------------------------------------------

* Ensure Ubuntu 13.10 is fully up to date:

  sudo apt-get update
  sudo apt-get dist-upgrade
  sudo apt-get builddep libguestfs
  # These are required for virt-builder and not included in the current
  # build deps on Ubuntu:
  sudo apt-get install flex bison curl gnupg

* Fix kernel permissions stupidity:

  sudo chmod go+r /boot/vmlinuz*

* Build libguestfs by doing:

  chmod +x localconfigure
  ./localconfigure
  make -C po-docs update-po
  make
  make quickcheck                       # check it works

* Run virt-builder against the public repo:

  # Have to set the environment variable because the ./run script
  # by default changes the virt-builder source:
  export VIRT_BUILDER_SOURCE=http://libguestfs.org/download/builder/index.asc
  ./run ./builder/virt-builder -l

* Demonstration showing virt-builder building a Debian 6 image
  (template is cached, but this is all running inside a VM which is
  why it's slower than it would be on baremetal):

$ ./run ./builder/virt-builder --version
virt-builder 1.25.6

$ ./run ./builder/virt-builder --print-cache
centos-6                 no
debian-6                 cached
debian-7                 no
fedora-18                no
fedora-19                no
scientificlinux-6        no
ubuntu-10.04             no
ubuntu-12.04             no
ubuntu-13.10             no

$ ./run ./builder/virt-builder debian-6 --size 10G
[   0.0] Downloading: http://libguestfs.org/download/builder/debian-6.xz
[   1.0] Creating disk image: debian-6.img
[   1.0] Uncompressing: http://libguestfs.org/download/builder/debian-6.xz
[  19.0] Running virt-resize to expand the disk to 10.0G
[ 104.0] Opening the new disk
[ 129.0] Setting a random seed
[ 129.0] Random root password: Q64PFtMoQ5oMN4iS [did you mean to use --root-password?]
[ 129.0] Finishing off
Output: debian-6.img
Total usable space: 9.6G
Free space: 9.0G (93%)

HTH,
Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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