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Define the SourcePlugin class, which is the class that should be
subclassed to create a 'source' plugin.
'Source' plugins provide a mechanism to customize various aspects of
the image generation process in wic, mainly the contents of
partitions.
The initial version of wic defined a --source param for partitions,
which was in the first revision hard-coded to two possible values:
rootfs and bootimg.
This patch essentially removes the hard-coded --bootimg param and
replaces it with a plugin system that maps the value specified as
--source to a particular 'source' plugin instead.
A 'source' plugin is created as a subclass of SourcePlugin and the
plugin file containing it is added to scriptsl/lib/mic/plugins/source/
to make the plugin implementation available to the wic implementation.
When the wic implementation needs to invoke a partition-specific
implementation, it looks for the plugin that has the same name as the
--source param given to that partition. For example, if the partition
is set up like this:
part /boot --source bootimg-pcbios ...
then the methods defined as class members of the plugin having the
matching .name class member would be used.
To be more concrete, here's the plugin definition that would match a
'--source bootimg-pcbios' usage, along with an example method that
would be called by the wic implementation when it needed to invoke an
implementation-specific partition-preparation function:
class BootimgPcbiosPlugin(SourcePlugin):
name = 'bootimg-pcbios'
@classmethod
def do_prepare_partition(self, part, ...)
If the subclass itself doesn't implement a function, a 'default'
version in a superclass will be located and used, which is why all
plugins must be derived from SourcePlugin.
This scheme is extensible - adding more hooks is a simple matter of
adding more plugin methods to SourcePlugin and derived classes. The
code that then needs to call the plugin methods the uses
plugin.get_source_plugin_methods() to find the method(s) needed by the
call; this is done by filling up a dict with keys containing the
methon names of interest - on success, these will be filled in with
the actual methods. fPlease see the implementation for examples and
details.
Note that a source plugin need not restrict itself to methods that
apply directly to partitions - methods can also be defined for higher
level processing such as at the 'disk' level. The
get_default_source_plugin() of DirectImageCreator allows the default
source plugin to be retrieved; by default this is set to be the same
plugin used for the /boot partition, but that can be overridden by
specifying a different --source and therefore different plugin on the
'bootloader' line. This isn't ideal, but it avoids forcing a new
high-level object to be defined for that purpose.
Note that the '--source rootfs' param remains as its current
hard-coded value, which is just the rootfs to be used to populate the
partition - by default, that's just the value of the bitbake
ROOTFS_DIR variable (or whatever was passed in using the -r param).
Note that this also could also be overridden by creating a source
plugin using a different name; at this point, unlike with bootimg,
there's been no need to do so.
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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Reuses the mic/livecd infrastructure but heavily subclasses and
modifies it to adapt to the special needs of building images from
existing OpenEmbedded build artifacts.
In addition to the OE-specific mic objects and modifications to the
underlying infrastructure, this adds a mechanism to allow OE kickstart
files to be 'canned' and made available to users via the 'wic list
images' command.
Two initial OE kickstart files have been added as canned .wks files:
directdisk, which implements the same thing as the images created by
directdisk.bbclass, and mkefidisk, which can essentially be used as a
replacement for mkefidisk.sh. Of course, since creation of these
images are now driven by .wks files rather than being hard-coded into
class files or scripts, they can be easily modified to generate
different variations on those images. They also don't require root
priveleges, since they don't use mount to create the images. They
don't however write to media like mkefidisk.sh does, but rather create
images that can be written onto media.
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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This is the starting point for the implemention described in [YOCTO
3847] which came to the conclusion that it would make sense to use
kickstart syntax to implement image creation in OpenEmbedded. I
subsequently realized that there was an existing tool that already
implemented image creation using kickstart syntax, the Tizen/Meego mic
tool. As such, it made sense to use that as a starting point - this
commit essentially just copies the relevant Python code from the MIC
tool to the scripts/lib dir, where it can be accessed by the
previously created wic tool.
Most of this will be removed or renamed by later commits, since we're
initially focusing on partitioning only. Care should be taken so that
we can easily add back any additional functionality should we decide
later to expand the tool, though (we may also want to contribute our
local changes to the mic tool to the Tizen project if it makes sense,
and therefore should avoid gratuitous changes to the original code if
possible).
Added the /mic subdir from Tizen mic repo as a starting point:
git clone git://review.tizen.org/tools/mic.git
For reference, the top commit:
commit 20164175ddc234a17b8a12c33d04b012347b1530
Author: Gui Chen <gui.chen@intel.com>
Date: Sun Jun 30 22:32:16 2013 -0400
bump up to 0.19.2
Also added the /plugins subdir, moved to under the /mic subdir (to
match the default plugin_dir location in mic.conf.in, which was
renamed to yocto-image.conf (moved and renamed by later patches) and
put into /scripts.
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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Tom Zanussi