bmaptool support

Hi,

This patchset adds ability to use bmaptool to flash images faster than using traditional methods. It contains bmap-tools recipe and generation of .bmap files for the images generated by bitbake and wic.

Bmaptool is a generic tool for creating the block map (bmap) for a file and and copying files using the block map. The idea is that large file containing unused blocks, like raw system image files, can be copied or flashed a lot faster with bmaptool than with traditional tools like "dd" or "cp".

Here is an example of flashing image using dd and bmaptool showing around 25% performance gain in flashing time:

19M -rw-r--r-- 1 ed ed 26M Apr 26 11:36 core-image-minimal-qemux86-64-20160426083554.rootfs.ext4
4.0K -rw-r--r-- 1 ed ed 2.7K Apr 26 11:36 core-image-minimal-qemux86-64-20160426083554.rootfs.ext4.bmap

52302+0 records in
52302+0 records out
26778624 bytes (27 MB) copied, 2.51183 s, 10.7 MB/s

real    0m2.515s
user    0m0.014s
sys     0m0.329s

bmaptool: info: discovered bmap file 'core-image-minimal-qemux86-64-20160426083554.rootfs.ext4.bmap'
bmaptool: info: block map format version 2.0
bmaptool: info: 6538 blocks of size 4096 (25.5 MiB), mapped 4799 blocks (18.7 MiB or 73.4%)
bmaptool: info: copying image 'core-image-minimal-qemux86-64-20160426083554.rootfs.ext4' to block device '/dev/sdb' using bmap file 'core-image-minimal-qemux86-64-20160426083554.rootfs.ext4.bmap'
bmaptool: info: 100% copied
bmaptool: info: synchronizing '/dev/sdb'
bmaptool: info: copying time: 1.8s, copying speed 10.3 MiB/sec

real    0m1.909s
user    0m0.226s
sys     0m0.052s

The test was repeated 5 times with the same image and the same usb stick device.

Changes in v2: Combined Alexander's and my bmap-tools recipes.
Got rid of generating standalone script as it breaks build of bmap-tools-native.

Changes in v3: Returned back generation of standalone bmaptool script
Implemented --bmap option for wic
Added test case to test bmap generation by wic --bmap

The following changes since commit f7b520878babbaa7527151f22c031ae160512753:

poky: Switch to post release name/version (2016-04-29 07:58:46 +0100)

are available in the git repository at:

git://git.yoctoproject.org/poky-contrib ed/oe-core/bmap-tools-9414
http://git.yoctoproject.org/cgit.cgi/poky-contrib/log/?h=ed/oe-core/bmap-tools-9414

Alexander D. Kanevskiy (1):
image types: add bmap generation option

Ed Bartosh (5):
bmap-tools: initial commit, version 3.2
selftest: add bmap test
bmap-tools: generate standalone script
wic: implement --bmap option
oe-selftest: wic: add test_bmap test case

 meta/classes/image_types.bbclass                  |  4 ++-
 meta/lib/oeqa/selftest/imagefeatures.py           | 27 +++++++++++++++
 meta/lib/oeqa/selftest/wic.py                     |  8 +++++
 meta/recipes-support/bmap-tools/bmap-tools_3.2.bb | 42 +++++++++++++++++++++++
 scripts/lib/wic/creator.py                        |  1 +
 scripts/lib/wic/engine.py                         | 11 ++++--
 scripts/lib/wic/imager/direct.py                  | 23 ++++++++-----
 scripts/lib/wic/plugins/imager/direct_plugin.py   |  3 +-
 scripts/wic                                       |  3 +-
 9 files changed, 108 insertions(+), 14 deletions(-)
 create mode 100644 meta/recipes-support/bmap-tools/bmap-tools_3.2.bb

2.1.4