add subcommand schema for storage-config validation
Introduce curtin feature 'STORAGE_CONFIG_SCHEMA' and a subcommand,
'schema' which accepts a path to a storage configuration file and
will validate the configuration against the storage schema.
Add some exception handling logic to decode the schema errors and
print useful pointers to users on where the error occurred.
clear-holders: wipe raid members at data offsets when not assembled
RAID5 arrays are assembled in degraded mode for speed[1]. If an
array is INACTIVE, then curtin cannot wipe the array through the
md device. Instead, examine the array members and find the mdadm
superblock and data offsets and wipe members at those locations.
This wipes the array contents without requiring it to be runnable.
ChrootableTarget: add /run to mounts for redhat targets
Recent updates to redhat target images appear to require
/run to be mounted. Update ChrootableTarget to allow callers
to specify a list of mounts needed. In curthooks.setup_grub
if target is redhat, then ensure that /run is in the list.
vmtest: consolidate vm mem config, defaults via release, env override
vmtest has a few hard-coded places which specify vm ram size of 1G.
Consolidate this configuration and allow the environment to override
the value as needed. Finally, set the default vm ram size in the the
releases and tune Disco release to 2048.
Support for multi-layers images fsimage-layered:// URI
Curtin can now download and mount a layered filesystem image for use
as a source image. Local file or url are supported. Filesystem can be
any filesystem type mountable by the running kernel.
A "fsimage-layered" install source is a string representing one or
more mountable images from a single local or remote directory. The
string is dot-separated where each value between the dots represents a
particular image and the location of the name within the string
encodes the order in which it is to be mounted. The resulting list of
images are downloaded (if needed) then mounted and overlayed into a
single directory which is used as the source for installation.
