[OE-core] [PATCH v3 0/7] wic: Add --rootfs option to --source param

[João Henrique Ferreira de Freitas]

Hi, 

These patchs allows the user create the following directdisk-multi-rootfs.wks file:

  part /boot --source bootimg-pcbios --ondisk sda --fstype=msdos \
    --label boot --active --align 1024
  part / --source rootfs --ondisk sda --fstype=ext3 --label primary --align 1024

  part /standby --source rootfs --rootfs-dir=<special rootfs directory> \
    --ondisk sda --fstype=ext3 --label secondary --align 1024

  bootloader  --timeout=0  --append="rootwait rootfstype=ext3 video=vesafb vga=0x318 console=tty0"

The special thing is the /standby partition. Which using rootfs with
a extra '--rootfs' argument instruct the RootfsPlugin what should be
the rootfs directory to be used to create the partition.

Besides that, the user can specify a more generic connection
between wic command-line --rootfs-dir and what is describing in .wks file. Like this:

wic create ... --rootfs-dir rootfs1=/some/rootfs/dir --rootfs-dir rootfs2=/some/other/rootfs/dir

  part / --source rootfs --rootfs-dir="rootfs1" --ondisk sda --fstype=ext3 --label primary --align 1024

  part /standby --source rootfs --rootfs-dir="rootfs2" \
    --ondisk sda --fstype=ext3 --label secondary --align 1024

So no hard-coded path is used in .wks. The connection string could be any string that 
makes a link between the '--rootfs-dir'

It is a very simple features that let users to customize your partition
setup. I thought in the case where we have two rootfs (like active and
standby, e.g used to software update). Or the odd cases when a special
partition need to be create to hold whatever files.

The workflow of wic use remains the same. All the config needs to be done
in .wks file.

To test I used <special rootfs directory> as a rootfs created by 'bitbkae core-image-minimal-dev'
(e.g: /srv/build/yocto/master/tmp/work/genericx86-poky-linux/core-image-minimal-dev/1.0-r0/rootfs).

changes since previous version:
 v2: 
  - in .wks syntax change --rootfs to --rootfs-dir
  - reporting all extra partitions in the output
  - use a connection string between --rootfs-dir from wic command-line and .wks
 v3:
  - fix when wic -e command-line param is used and no --rootfs-dir was passed

João Henrique Ferreira de Freitas (7):
  wic: Add RootfsPlugin
  wic: Hook up RootfsPlugin plugin
  wic: Add rootfs_dir argument to do_prepare_partition() method
  wic: Use partition label to be part of rootfs filename
  wic: Add option --rootfs-dir to --source
  wic: Report all ROOTFS_DIR artifacts
  wic: Extend --rootfs-dir to connect rootfs-dirs

 scripts/lib/mic/imager/direct.py                   | 20 +++++--
 .../lib/mic/kickstart/custom_commands/partition.py | 51 ++++++++++------
 scripts/lib/mic/pluginbase.py                      |  2 +-
 scripts/lib/mic/plugins/imager/direct_plugin.py    | 17 +++++-
 scripts/lib/mic/plugins/source/bootimg-efi.py      |  2 +-
 scripts/lib/mic/plugins/source/bootimg-pcbios.py   |  2 +-
 scripts/lib/mic/plugins/source/rootfs.py           | 68 ++++++++++++++++++++++
 scripts/wic                                        | 36 +++++++++++-
 8 files changed, 169 insertions(+), 29 deletions(-)
 create mode 100644 scripts/lib/mic/plugins/source/rootfs.py

-- 
1.8.3.2