wic: get rid of scripts/lib/image

Moved content of scripts/lib/image/ to scripts/lib/wic as
one directory with the same name as a tool is self-explanatory
and less confusing than two.

Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 826 insertions, 0 deletions

diff --git a/scripts/lib/wic/help.py b/scripts/lib/wic/help.py
new file mode 100644
index 0000000000..cd2176d151
--- /dev/null
+++ b/scripts/lib/wic/help.py
@@ -0,0 +1,826 @@
+# ex:ts=4:sw=4:sts=4:et
+# -*- tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*-
+#
+# Copyright (c) 2013, Intel Corporation.
+# All rights reserved.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+#
+# DESCRIPTION
+# This module implements some basic help invocation functions along
+# with the bulk of the help topic text for the OE Core Image Tools.
+#
+# AUTHORS
+# Tom Zanussi <tom.zanussi (at] linux.intel.com>
+#
+
+import subprocess
+import logging
+
+from wic.plugin import pluginmgr, PLUGIN_TYPES
+
+def subcommand_error(args):
+    logging.info("invalid subcommand %s" % args[0])
+
+
+def display_help(subcommand, subcommands):
+    """
+    Display help for subcommand.
+    """
+    if subcommand not in subcommands:
+        return False
+
+    hlp = subcommands.get(subcommand, subcommand_error)[2]
+    if callable(hlp):
+        hlp = hlp()
+    pager = subprocess.Popen('less', stdin=subprocess.PIPE)
+    pager.communicate(hlp)
+
+    return True
+
+
+def wic_help(args, usage_str, subcommands):
+    """
+    Subcommand help dispatcher.
+    """
+    if len(args) == 1 or not display_help(args[1], subcommands):
+        print usage_str
+
+
+def get_wic_plugins_help():
+    """
+    Combine wic_plugins_help with the help for every known
+    source plugin.
+    """
+    result = wic_plugins_help
+    for plugin_type in PLUGIN_TYPES:
+        result += '\n\n%s PLUGINS\n\n' % plugin_type.upper()
+        for name, plugin in pluginmgr.get_plugins(plugin_type).iteritems():
+            result += "\n %s plugin:\n" % name
+            if plugin.__doc__:
+                result += plugin.__doc__
+            else:
+                result += "\n    %s is missing docstring\n" % plugin
+    return result
+
+
+def invoke_subcommand(args, parser, main_command_usage, subcommands):
+    """
+    Dispatch to subcommand handler borrowed from combo-layer.
+    Should use argparse, but has to work in 2.6.
+    """
+    if not args:
+        logging.error("No subcommand specified, exiting")
+        parser.print_help()
+        return 1
+    elif args[0] == "help":
+        wic_help(args, main_command_usage, subcommands)
+    elif args[0] not in subcommands:
+        logging.error("Unsupported subcommand %s, exiting\n" % (args[0]))
+        parser.print_help()
+        return 1
+    else:
+        usage = subcommands.get(args[0], subcommand_error)[1]
+        subcommands.get(args[0], subcommand_error)[0](args[1:], usage)
+
+
+##
+# wic help and usage strings
+##
+
+wic_usage = """
+
+ Create a customized OpenEmbedded image
+
+ usage: wic [--version] | [--help] | [COMMAND [ARGS]]
+
+ Current 'wic' commands are:
+    help              Show help for command or one of the topics (see below)
+    create            Create a new OpenEmbedded image
+    list              List available values for options and image properties
+
+ Help topics:
+    overview          wic overview - General overview of wic
+    plugins           wic plugins - Overview and API
+    kickstart         wic kickstart - wic kickstart reference
+"""
+
+wic_help_usage = """
+
+ usage: wic help <subcommand>
+
+ This command displays detailed help for the specified subcommand.
+"""
+
+wic_create_usage = """
+
+ Create a new OpenEmbedded image
+
+ usage: wic create <wks file or image name> [-o <DIRNAME> | --outdir <DIRNAME>]
+            [-i <JSON PROPERTY FILE> | --infile <JSON PROPERTY_FILE>]
+            [-e | --image-name] [-s, --skip-build-check] [-D, --debug]
+            [-r, --rootfs-dir] [-b, --bootimg-dir]
+            [-k, --kernel-dir] [-n, --native-sysroot] [-f, --build-rootfs]
+
+ This command creates an OpenEmbedded image based on the 'OE kickstart
+ commands' found in the <wks file>.
+
+ The -o option can be used to place the image in a directory with a
+ different name and location.
+
+ See 'wic help create' for more detailed instructions.
+"""
+
+wic_create_help = """
+
+NAME
+    wic create - Create a new OpenEmbedded image
+
+SYNOPSIS
+    wic create <wks file or image name> [-o <DIRNAME> | --outdir <DIRNAME>]
+        [-e | --image-name] [-s, --skip-build-check] [-D, --debug]
+        [-r, --rootfs-dir] [-b, --bootimg-dir]
+        [-k, --kernel-dir] [-n, --native-sysroot] [-f, --build-rootfs]
+        [-c, --compress-with]
+
+DESCRIPTION
+    This command creates an OpenEmbedded image based on the 'OE
+    kickstart commands' found in the <wks file>.
+
+    In order to do this, wic needs to know the locations of the
+    various build artifacts required to build the image.
+
+    Users can explicitly specify the build artifact locations using
+    the -r, -b, -k, and -n options.  See below for details on where
+    the corresponding artifacts are typically found in a normal
+    OpenEmbedded build.
+
+    Alternatively, users can use the -e option to have 'wic' determine
+    those locations for a given image.  If the -e option is used, the
+    user needs to have set the appropriate MACHINE variable in
+    local.conf, and have sourced the build environment.
+
+    The -e option is used to specify the name of the image to use the
+    artifacts from e.g. core-image-sato.
+
+    The -r option is used to specify the path to the /rootfs dir to
+    use as the .wks rootfs source.
+
+    The -b option is used to specify the path to the dir containing
+    the boot artifacts (e.g. /EFI or /syslinux dirs) to use as the
+    .wks bootimg source.
+
+    The -k option is used to specify the path to the dir containing
+    the kernel to use in the .wks bootimg.
+
+    The -n option is used to specify the path to the native sysroot
+    containing the tools to use to build the image.
+
+    The -f option is used to build rootfs by running "bitbake <image>"
+
+    The -s option is used to skip the build check.  The build check is
+    a simple sanity check used to determine whether the user has
+    sourced the build environment so that the -e option can operate
+    correctly.  If the user has specified the build artifact locations
+    explicitly, 'wic' assumes the user knows what he or she is doing
+    and skips the build check.
+
+    The -D option is used to display debug information detailing
+    exactly what happens behind the scenes when a create request is
+    fulfilled (or not, as the case may be).  It enumerates and
+    displays the command sequence used, and should be included in any
+    bug report describing unexpected results.
+
+    When 'wic -e' is used, the locations for the build artifacts
+    values are determined by 'wic -e' from the output of the 'bitbake
+    -e' command given an image name e.g. 'core-image-minimal' and a
+    given machine set in local.conf.  In that case, the image is
+    created as if the following 'bitbake -e' variables were used:
+
+    -r:        IMAGE_ROOTFS
+    -k:        STAGING_KERNEL_DIR
+    -n:        STAGING_DIR_NATIVE
+    -b:        empty (plugin-specific handlers must determine this)
+
+    If 'wic -e' is not used, the user needs to select the appropriate
+    value for -b (as well as -r, -k, and -n).
+
+    The -o option can be used to place the image in a directory with a
+    different name and location.
+
+    The -c option is used to specify compressor utility to compress
+    an image. gzip, bzip2 and xz compressors are supported.
+
+    The set of properties available for a given image type can be
+    listed using the 'wic list' command.
+"""
+
+wic_list_usage = """
+
+ List available OpenEmbedded image properties and values
+
+ usage: wic list images
+        wic list <image> help
+        wic list source-plugins
+        wic list properties
+        wic list properties <wks file>
+        wic list property <property>
+                [-o <JSON PROPERTY FILE> | --outfile <JSON PROPERTY_FILE>]
+
+ This command enumerates the set of available canned images as well as
+ help for those images.  It also can be used to enumerate the complete
+ set of possible values for a specified option or property needed by
+ the image creation process.
+
+ The first form enumerates all the available 'canned' images.
+
+ The second form lists the detailed help information for a specific
+ 'canned' image.
+
+ The third form enumerates all the available --sources (source
+ plugins).
+
+ The fourth form enumerates all the possible values that exist and can
+ be specified in an OE kickstart (wks) file.
+
+ The fifth form enumerates all the possible options that exist for the
+ set of properties specified in a given OE kickstart (ks) file.
+
+ The final form enumerates all the possible values that exist and can
+ be specified for any given OE kickstart (wks) property.
+
+ See 'wic help list' for more details.
+"""
+
+wic_list_help = """
+
+NAME
+    wic list - List available OpenEmbedded image properties and values
+
+SYNOPSIS
+    wic list images
+    wic list <image> help
+    wic list source-plugins
+    wic list properties
+    wic list properties <wks file>
+    wic list property <property>
+            [-o <JSON PROPERTY FILE> | --outfile <JSON PROPERTY_FILE>]
+
+DESCRIPTION
+    This command enumerates the complete set of possible values for a
+    specified option or property needed by the image creation process.
+
+    This command enumerates the set of available canned images as well
+    as help for those images.  It also can be used to enumerate the
+    complete set of possible values for a specified option or property
+    needed by the image creation process.
+
+    The first form enumerates all the available 'canned' images.
+    These are actually just the set of .wks files that have been moved
+    into the /scripts/lib/wic/canned-wks directory).
+
+    The second form lists the detailed help information for a specific
+    'canned' image.
+
+    The third form enumerates all the available --sources (source
+    plugins).  The contents of a given partition are driven by code
+    defined in 'source plugins'.  Users specify a specific plugin via
+    the --source parameter of the partition .wks command.  Normally
+    this is the 'rootfs' plugin but can be any of the more specialized
+    sources listed by the 'list source-plugins' command.  Users can
+    also add their own source plugins - see 'wic help plugins' for
+    details.
+
+    The third form enumerates all the possible values that exist and
+    can be specified in a OE kickstart (wks) file.  The output of this
+    can be used by the third form to print the description and
+    possible values of a specific property.
+
+    The fourth form enumerates all the possible options that exist for
+    the set of properties specified in a given OE kickstart (wks)
+    file.  If the -o option is specified, the list of properties, in
+    addition to being displayed, will be written to the specified file
+    as a JSON object.  In this case, the object will consist of the
+    set of name:value pairs corresponding to the (possibly nested)
+    dictionary of properties defined by the input statements used by
+    the image.  Some example output for the 'list <wks file>' command:
+
+    $ wic list test.ks
+    "part" : {
+        "mountpoint" : "/"
+        "fstype" : "ext3"
+    }
+    "part" : {
+        "mountpoint" : "/home"
+        "fstype" : "ext3"
+        "offset" : "10000"
+    }
+    "bootloader" : {
+        "type" : "efi"
+    }
+    .
+    .
+    .
+
+    Each entry in the output consists of the name of the input element
+    e.g. "part", followed by the properties defined for that
+    element enclosed in braces.  This information should provide
+    sufficient information to create a complete user interface with.
+
+    The final form enumerates all the possible values that exist and
+    can be specified for any given OE kickstart (wks) property.  If
+    the -o option is specified, the list of values for the given
+    property, in addition to being displayed, will be written to the
+    specified file as a JSON object.  In this case, the object will
+    consist of the set of name:value pairs corresponding to the array
+    of property values associated with the property.
+
+    $ wic list property part
+        ["mountpoint", "where the partition should be mounted"]
+        ["fstype", "filesytem type of the partition"]
+            ["ext3"]
+            ["ext4"]
+            ["btrfs"]
+            ["swap"]
+        ["offset", "offset of the partition within the image"]
+
+"""
+
+wic_plugins_help = """
+
+NAME
+    wic plugins - Overview and API
+
+DESCRIPTION
+    plugins allow wic functionality to be extended and specialized by
+    users.  This section documents the plugin interface, which is
+    currently restricted to 'source' plugins.
+
+    'Source' plugins provide a mechanism to customize various aspects
+    of the image generation process in wic, mainly the contents of
+    partitions.
+
+    Source plugins provide a mechanism for mapping values specified in
+    .wks files using the --source keyword to a particular plugin
+    implementation that populates a corresponding partition.
+
+    A source plugin is created as a subclass of SourcePlugin (see
+    scripts/lib/wic/pluginbase.py) and the plugin file containing it
+    is added to scripts/lib/wic/plugins/source/ to make the plugin
+    implementation available to the wic implementation.
+
+    Source plugins can also be implemented and added by external
+    layers - any plugins found in a scripts/lib/wic/plugins/source/
+    directory in an external layer will also be made available.
+
+    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 bootimg-pcbios .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.
+
+    The SourcePlugin class defines the following methods, which is the
+    current set of methods that can be implemented/overridden by
+    --source plugins.  Any methods not implemented by a SourcePlugin
+    subclass inherit the implementations present in the SourcePlugin
+    class (see the SourcePlugin source for details):
+
+      do_prepare_partition()
+          Called to do the actual content population for a
+          partition. In other words, it 'prepares' the final partition
+          image which will be incorporated into the disk image.
+
+      do_configure_partition()
+          Called before do_prepare_partition(), typically used to
+          create custom configuration files for a partition, for
+          example syslinux or grub config files.
+
+      do_install_disk()
+          Called after all partitions have been prepared and assembled
+          into a disk image.  This provides a hook to allow
+          finalization of a disk image, for example to write an MBR to
+          it.
+
+      do_stage_partition()
+          Special content-staging hook called before
+          do_prepare_partition(), normally empty.
+
+          Typically, a partition will just use the passed-in
+          parameters, for example the unmodified value of bootimg_dir.
+          In some cases however, things may need to be more tailored.
+          As an example, certain files may additionally need to be
+          take from bootimg_dir + /boot.  This hook allows those files
+          to be staged in a customized fashion.  Note that
+          get_bitbake_var() allows you to access non-standard
+          variables that you might want to use for these types of
+          situations.
+
+    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 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 method names of interest - on success, these will be filled in
+    with the actual methods. Please see the implementation for
+    examples and details.
+"""
+
+wic_overview_help = """
+
+NAME
+    wic overview - General overview of wic
+
+DESCRIPTION
+    The 'wic' command generates partitioned images from existing
+    OpenEmbedded build artifacts.  Image generation is driven by
+    partitioning commands contained in an 'Openembedded kickstart'
+    (.wks) file (see 'wic help kickstart') specified either directly
+    on the command-line or as one of a selection of canned .wks files
+    (see 'wic list images').  When applied to a given set of build
+    artifacts, the result is an image or set of images that can be
+    directly written onto media and used on a particular system.
+
+    The 'wic' command and the infrastructure it's based on is by
+    definition incomplete - its purpose is to allow the generation of
+    customized images, and as such was designed to be completely
+    extensible via a plugin interface (see 'wic help plugins').
+
+  Background and Motivation
+
+    wic is meant to be a completely independent standalone utility
+    that initially provides easier-to-use and more flexible
+    replacements for a couple bits of existing functionality in
+    oe-core: directdisk.bbclass and mkefidisk.sh.  The difference
+    between wic and those examples is that with wic the functionality
+    of those scripts is implemented by a general-purpose partitioning
+    'language' based on Redhat kickstart syntax).
+
+    The initial motivation and design considerations that lead to the
+    current tool are described exhaustively in Yocto Bug #3847
+    (https://bugzilla.yoctoproject.org/show_bug.cgi?id=3847).
+
+  Implementation and Examples
+
+    wic can be used in two different modes, depending on how much
+    control the user needs in specifying the Openembedded build
+    artifacts that will be used in creating the image: 'raw' and
+    'cooked'.
+
+    If used in 'raw' mode, artifacts are explicitly specified via
+    command-line arguments (see example below).
+
+    The more easily usable 'cooked' mode uses the current MACHINE
+    setting and a specified image name to automatically locate the
+    artifacts used to create the image.
+
+    OE kickstart files (.wks) can of course be specified directly on
+    the command-line, but the user can also choose from a set of
+    'canned' .wks files available via the 'wic list images' command
+    (example below).
+
+    In any case, the prerequisite for generating any image is to have
+    the build artifacts already available.  The below examples assume
+    the user has already build a 'core-image-minimal' for a specific
+    machine (future versions won't require this redundant step, but
+    for now that's typically how build artifacts get generated).
+
+    The other prerequisite is to source the build environment:
+
+      $ source oe-init-build-env
+
+    To start out with, we'll generate an image from one of the canned
+    .wks files.  The following generates a list of availailable
+    images:
+
+      $ wic list images
+        mkefidisk             Create an EFI disk image
+        directdisk            Create a 'pcbios' direct disk image
+
+    You can get more information about any of the available images by
+    typing 'wic list xxx help', where 'xxx' is one of the image names:
+
+      $ wic list mkefidisk help
+
+    Creates a partitioned EFI disk image that the user can directly dd
+    to boot media.
+
+    At any time, you can get help on the 'wic' command or any
+    subcommand (currently 'list' and 'create').  For instance, to get
+    the description of 'wic create' command and its parameters:
+
+      $ wic create
+
+       Usage:
+
+       Create a new OpenEmbedded image
+
+       usage: wic create <wks file or image name> [-o <DIRNAME> | ...]
+            [-i <JSON PROPERTY FILE> | --infile <JSON PROPERTY_FILE>]
+            [-e | --image-name] [-s, --skip-build-check] [-D, --debug]
+            [-r, --rootfs-dir] [-b, --bootimg-dir] [-k, --kernel-dir]
+            [-n, --native-sysroot] [-f, --build-rootfs]
+
+       This command creates an OpenEmbedded image based on the 'OE
+       kickstart commands' found in the <wks file>.
+
+       The -o option can be used to place the image in a directory
+       with a different name and location.
+
+       See 'wic help create' for more detailed instructions.
+       ...
+
+    As mentioned in the command, you can get even more detailed
+    information by adding 'help' to the above:
+
+      $ wic help create
+
+    So, the easiest way to create an image is to use the -e option
+    with a canned .wks file.  To use the -e option, you need to
+    specify the image used to generate the artifacts and you actually
+    need to have the MACHINE used to build them specified in your
+    local.conf (these requirements aren't necessary if you aren't
+    using the -e options.)  Below, we generate a directdisk image,
+    pointing the process at the core-image-minimal artifacts for the
+    current MACHINE:
+
+      $ wic create directdisk -e core-image-minimal
+
+      Checking basic build environment...
+      Done.
+
+      Creating image(s)...
+
+      Info: The new image(s) can be found here:
+      /var/tmp/wic/build/directdisk-201309252350-sda.direct
+
+      The following build artifacts were used to create the image(s):
+
+      ROOTFS_DIR:      ...
+      BOOTIMG_DIR:     ...
+      KERNEL_DIR:      ...
+      NATIVE_SYSROOT:  ...
+
+      The image(s) were created using OE kickstart file:
+        .../scripts/lib/wic/canned-wks/directdisk.wks
+
+    The output shows the name and location of the image created, and
+    so that you know exactly what was used to generate the image, each
+    of the artifacts and the kickstart file used.
+
+    Similarly, you can create a 'mkefidisk' image in the same way
+    (notice that this example uses a different machine - because it's
+    using the -e option, you need to change the MACHINE in your
+    local.conf):
+
+      $ wic create mkefidisk -e core-image-minimal
+      Checking basic build environment...
+      Done.
+
+      Creating image(s)...
+
+      Info: The new image(s) can be found here:
+         /var/tmp/wic/build/mkefidisk-201309260027-sda.direct
+
+      ...
+
+    Here's an example that doesn't take the easy way out and manually
+    specifies each build artifact, along with a non-canned .wks file,
+    and also uses the -o option to have wic create the output
+    somewhere other than the default /var/tmp/wic:
+
+      $ wic create ./test.wks -o ./out --rootfs-dir
+      tmp/work/qemux86_64-poky-linux/core-image-minimal/1.0-r0/rootfs
+      --bootimg-dir tmp/sysroots/qemux86-64/usr/share
+      --kernel-dir tmp/deploy/images/qemux86-64
+      --native-sysroot tmp/sysroots/x86_64-linux
+
+     Creating image(s)...
+
+     Info: The new image(s) can be found here:
+           out/build/test-201507211313-sda.direct
+
+     The following build artifacts were used to create the image(s):
+       ROOTFS_DIR:                   tmp/work/qemux86_64-poky-linux/core-image-minimal/1.0-r0/rootfs
+       BOOTIMG_DIR:                  tmp/sysroots/qemux86-64/usr/share
+       KERNEL_DIR:                   tmp/deploy/images/qemux86-64
+       NATIVE_SYSROOT:               tmp/sysroots/x86_64-linux
+
+     The image(s) were created using OE kickstart file:
+     ./test.wks
+
+     Here is a content of test.wks:
+
+     part /boot --source bootimg-pcbios --ondisk sda --label boot --active --align 1024
+     part / --source rootfs --ondisk sda --fstype=ext3 --label platform --align 1024
+
+     bootloader  --timeout=0  --append="rootwait rootfstype=ext3 video=vesafb vga=0x318 console=tty0"
+
+
+    Finally, here's an example of the actual partition language
+    commands used to generate the mkefidisk image i.e. these are the
+    contents of the mkefidisk.wks OE kickstart file:
+
+      # short-description: Create an EFI disk image
+      # long-description: Creates a partitioned EFI disk image that the user
+      # can directly dd to boot media.
+
+      part /boot --source bootimg-efi --ondisk sda --fstype=efi --active
+
+      part / --source rootfs --ondisk sda --fstype=ext3 --label platform
+
+      part swap --ondisk sda --size 44 --label swap1 --fstype=swap
+
+      bootloader  --timeout=10  --append="rootwait console=ttyPCH0,115200"
+
+    You can get a complete listing and description of all the
+    kickstart commands available for use in .wks files from 'wic help
+    kickstart'.
+"""
+
+wic_kickstart_help = """
+
+NAME
+    wic kickstart - wic kickstart reference
+
+DESCRIPTION
+    This section provides the definitive reference to the wic
+    kickstart language.  It also provides documentation on the list of
+    --source plugins available for use from the 'part' command (see
+    the 'Platform-specific Plugins' section below).
+
+    The current wic implementation supports only the basic kickstart
+    partitioning commands: partition (or part for short) and
+    bootloader.
+
+    The following is a listing of the commands, their syntax, and
+    meanings. The commands are based on the Fedora kickstart
+    documentation but with modifications to reflect wic capabilities.
+
+      http://fedoraproject.org/wiki/Anaconda/Kickstart#part_or_partition
+      http://fedoraproject.org/wiki/Anaconda/Kickstart#bootloader
+
+  Commands
+
+    * 'part' or 'partition'
+
+       This command creates a partition on the system and uses the
+       following syntax:
+
+         part <mountpoint>
+
+       The <mountpoint> is where the partition will be mounted and
+       must take of one of the following forms:
+
+         /<path>: For example: /, /usr, or /home
+
+         swap: The partition will be used as swap space.
+
+       The following are supported 'part' options:
+
+         --size: The minimum partition size. Specify an integer value
+                 such as 500. Multipliers k, M ang G can be used. If
+                 not specified, the size is in MB.
+                 You do not need this option if you use --source.
+
+         --source: This option is a wic-specific option that names the
+                   source of the data that will populate the
+                   partition.  The most common value for this option
+                   is 'rootfs', but can be any value which maps to a
+                   valid 'source plugin' (see 'wic help plugins').
+
+                   If '--source rootfs' is used, it tells the wic
+                   command to create a partition as large as needed
+                   and to fill it with the contents of the root
+                   filesystem pointed to by the '-r' wic command-line
+                   option (or the equivalent rootfs derived from the
+                   '-e' command-line option).  The filesystem type
+                   that will be used to create the partition is driven
+                   by the value of the --fstype option specified for
+                   the partition (see --fstype below).
+
+                   If --source <plugin-name>' is used, it tells the
+                   wic command to create a partition as large as
+                   needed and to fill with the contents of the
+                   partition that will be generated by the specified
+                   plugin name using the data pointed to by the '-r'
+                   wic command-line option (or the equivalent rootfs
+                   derived from the '-e' command-line option).
+                   Exactly what those contents and filesystem type end
+                   up being are dependent on the given plugin
+                   implementation.
+
+                   If --source option is not used, the wic command
+                   will create empty partition. --size parameter has
+                   to be used to specify size of empty partition.
+
+         --ondisk or --ondrive: Forces the partition to be created on
+                                a particular disk.
+
+         --fstype: Sets the file system type for the partition.  These
+           apply to partitions created using '--source rootfs' (see
+           --source above).  Valid values are:
+
+             ext2
+             ext3
+             ext4
+             btrfs
+             squashfs
+             swap
+
+         --fsoptions: Specifies a free-form string of options to be
+                      used when mounting the filesystem. This string
+                      will be copied into the /etc/fstab file of the
+                      installed system and should be enclosed in
+                      quotes.  If not specified, the default string is
+                      "defaults".
+
+         --label label: Specifies the label to give to the filesystem
+                        to be made on the partition. If the given
+                        label is already in use by another filesystem,
+                        a new label is created for the partition.
+
+         --active: Marks the partition as active.
+
+         --align (in KBytes): This option is specific to wic and says
+                              to start a partition on an x KBytes
+                              boundary.
+
+         --no-table: This option is specific to wic. Space will be
+                     reserved for the partition and it will be
+                     populated but it will not be added to the
+                     partition table. It may be useful for
+                     bootloaders.
+
+         --extra-space: This option is specific to wic. It adds extra
+                        space after the space filled by the content
+                        of the partition. The final size can go
+                        beyond the size specified by --size.
+                        By default, 10MB.
+
+         --overhead-factor: This option is specific to wic. The
+                            size of the partition is multiplied by
+                            this factor. It has to be greater than or
+                            equal to 1.
+                            The default value is 1.3.
+
+         --part-type: This option is specific to wic. It specifies partition
+                      type GUID for GPT partitions.
+                      List of partition type GUIDS can be found here:
+                      http://en.wikipedia.org/wiki/GUID_Partition_Table#Partition_type_GUIDs
+
+         --use-uuid: This option is specific to wic. It makes wic to generate
+                     random globally unique identifier (GUID) for the partition
+                     and use it in bootloader configuration to specify root partition.
+
+         --uuid: This option is specific to wic. It specifies partition UUID.
+                 It's useful if preconfigured partition UUID is added to kernel command line
+                 in bootloader configuration before running wic. In this case .wks file can
+                 be generated or modified to set preconfigured parition UUID using this option.
+
+    * bootloader
+
+      This command allows the user to specify various bootloader
+      options.  The following are supported 'bootloader' options:
+
+        --timeout: Specifies the number of seconds before the
+                   bootloader times out and boots the default option.
+
+        --append: Specifies kernel parameters. These will be added to
+                  bootloader command-line - for example, the syslinux
+                  APPEND or grub kernel command line.
+
+      Note that bootloader functionality and boot partitions are
+      implemented by the various --source plugins that implement
+      bootloader functionality; the bootloader command essentially
+      provides a means of modifying bootloader configuration.
+"""