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The variable should only exist in snf-image-update-helper. If the
user wants to overwrite the value, he should create it in
/etc/default/snf-image-update-helper

Rename snf-image-create-fixed-helper script to snf-image-create-helper.
Also remove the command that will create a tar archive of the helper
files under /tmp

When you run snf-image-create-fixed-helper an archive of the fixed
helper is created under /tmp

Move the old snf-image-update-helper to snf-image-create-fixed-helper
and make the new snf-image-update-helper download a fixed helper image
specified by the HELPER_URL variable.

* Add custom vif script for the helper VM
* Cleanup helper code

Change HELPER_SIZE to 600 and HELPER_SOFT_TIMEOUT to 120

Add a new HELPER_SIZE variable for this purpose. Default size is
hardcoded to 400MB

Remove:
	HELPER_CACHE_DIR
	HELPER_IMG
	HELPER_KERNEL
	HELPER_INITRD
 	TIMELIMIT
Add:
	TIMEOUT

In configure, remove:
	--enable-network-backend
	--with-helper-img
	--with-helper-kernel
	--with-helper-initrd

snf-image-update-helper will only install a pkg retrieved from the
apt unless -p option is specified.

This can be used to enable or disable the version check between
snf-image-host and snf-image-helper at the end of the update-helper
script.

The files hosted in this directory will be added in the
/etc/apt/preferences.d directory of the helper image before multistrap
runs.

By default this directory is $(LOCALSTATEDIR)/cache/snf-image/helper

Signed-off-by: Dimitris Aragiorgis <dimara@grnet.gr>

Helper gets a dummy interface and communication between helper
and host is done via socat STDIO INTERFACE:eth0/vif$helperid.0
Signed-off-by: Dimitris Aragiorgis <dimara@grnet.gr>

Signed-off-by: Dimitris Aragiorgis <dimara@grnet.gr>

Support launching helper domain on top of Xen hypervisor under PV mode.

Helper VM becomes hypervisor aware by passing hypervisor=$HYPERVISOR
in the kernel command line and thus acts accordingly (which logging
devices to use, what disk/floppy devices to expect, etc)

We separate all hypervisor specific functions and vars and source them
according to $HYPERVISOR env var.

Due to the fact that multiconsole for PV domains is supported only after
linux kernel 3.2 (Stefano Stabellini tree - branch 3.2-multiconsole-2
git://xenbits.xen.org/people/sstabellini/linux-pvhvm.git

) all
output/error report and logging is done via hvc0.

Helper domain is debootstraped with 2 kernels (linux-image-amd64,
linux-image-xen-amd64) and is booted accordingly.

Floppy is not supported in PV so floppy is passed as another disk.

The images created can run on top of xen-hvm and xen-pvm hypervisor.

Change logging to start with HELPER_MONITOR_ in order to parse it when
having only one console.
Signed-off-by: Dimitris Aragiorgis <dimara@grnet.gr>

multistrap is more flexible allows as to define more that one
repository to retrieve packages from.

if this is set, then snf-image will run in debug mode.

The latter is part of gnu coreutils.

Add a utility initially written by vkoukis for monitoring the image
copy. This utility outputs notifications to a named pipe. An external
program can get informed for the image deployment progress by reading
the notifications from this named pipe. The monitoring mechanism
will be extended in the future to have other snf-image subparts
output notification to this named pipe too.

snf-image-helper by default uses it's own version of unattend.xml file,
but if UNATTEND variable is specified then it will use the one provided
by snf-image-host.

snf-image-host will make use the external progress monitor program
if the PROGRESS_MONITOR variable is not empty. This way progress
monitor can be enable or disabled by just overwriting the aforementioned
variable in the defaults file.

This file is used to check if the cache file contains every package
defined in HELPER_EXTRA_PKGS.

Now FixPartitionTable task can enlarge logical partitions

 * Drop "custom" image format type. The same functionality is provided
   by network-hosted images.
 * Images with id that starts with "http:", "https:", "ftp:", "ftps:"
   are considered to be network hosted and are downloaded via cURL.
 * Images with id that starts with "pithos:" are considered to be
   pithos-hosted.
 * Support for pithos and network hosted images is disabled by default.
   You may enable it when configuring the project  using
   --enable-pithos-backend and --enable-network-backend respectively.

Since curl is needed to find remote file sizes, lets do the whole
downloading with curl.

* Add code to compute the remote filesize
* Check for wget and curl in the configuration phase

 * Make all "local" variables lowercase.
 * Move HELPER_EXTRA_PKGS from snf-image-update-helper to common.sh
 * Protect all variables from spaces and other special chars
 * Remove extra X's from mktemp template names (only 6 are supported).
 * Make sure pipelines fail if any command (not only the rightmost)
   fails