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Refactor block_device: isolate the getval call

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Add a new getval call that allows to retrieve values
from the block device. Also isolating the block device
information into a 'blockdev' dictionary entry, to better
return it with the getval command.

This is a refactor from the original code at
I3600c6a3d663c697b59d91bd3fbb5e408af345e4.

Change-Id: I93d33669a3a0ae644eab9f9b955bb5a9470cadeb
Co-Authored-By: Andreas Florath <andreas@florath.net>
This commit is contained in:
Yolanda Robla 2017-05-01 09:19:49 +02:00
parent 803d40b0c6
commit 943f1ccf04
4 changed files with 50 additions and 25 deletions
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39
diskimage_builder/block_device/blockdevice.py
View File

@ -40,6 +40,10 @@ class BlockDevice(object):
call it is possible to e.g. query information from the (partially
automatic generated) internal state like root-label.
cmd_getval: retrieve information about the (internal) block device
state like the block image device (for bootloader) or the
root-label (for writing fstab).
cmd_create: creates all the different aspects of the block
device. When this call is successful, the complete block level
device is set up, filesystems are created and are mounted at
@ -209,6 +213,28 @@ class BlockDevice(object):
logger.info("Wrote final block device config to [%s]"
% self.config_json_file_name)
def cmd_getval(self):
"""Retrieve value from block device level
This is needed for backward compatibility (non python) access
to (internal) configuration.
"""
symbol = self.args.symbol
logger.info("Getting value for [%s]" % symbol)
if symbol == 'image-block-partition':
# If there is no partition needed, pass back directly the
# image.
if 'root' in self.state['blockdev']:
print("%s" % self.state['blockdev']['root']['device'])
else:
print("%s" % self.state['blockdev']['image0']['device'])
return 0
if symbol == 'image-path':
print("%s" % self.state['blockdev']['image0']['image'])
return 0
logger.error("Invalid symbol [%s] for getval" % symbol)
return 1
def cmd_create(self):
"""Creates the block device"""
@ -226,15 +252,6 @@ class BlockDevice(object):
rollback_cb()
sys.exit(1)
# To be compatible with the current implementation, echo the
# result to stdout.
# If there is no partition needed, pass back directly the
# image.
if 'root' in result:
print("%s" % result['root']['device'])
else:
print("%s" % result['image0']['device'])
self.write_state(result)
logger.info("create() finished")
@ -250,10 +267,6 @@ class BlockDevice(object):
for node in reverse_order:
node.umount(self.state)
# To be compatible with the current implementation, echo the
# result to stdout.
print("%s" % self.state['image0']['image'])
return 0
def cmd_cleanup(self):

11
diskimage_builder/block_device/level0/localloop.py
View File

@ -111,17 +111,20 @@ class LocalLoop(NodePluginBase):
block_device = self._loopdev_attach(self.filename)
rollback.append(lambda: self._loopdev_detach(block_device))
result[self.name] = {"device": block_device,
"image": self.filename}
if 'blockdev' not in result:
result['blockdev'] = {}
result['blockdev'][self.name] = {"device": block_device,
"image": self.filename}
logger.debug("Created loop name [%s] device [%s] image [%s]"
% (self.name, block_device, self.filename))
return
def umount(self, state):
self._loopdev_detach(state[self.name]['device'])
self._loopdev_detach(state['blockdev'][self.name]['device'])
def cleanup(self, state):
pass
def delete(self, state):
self._image_delete(state[self.name]['image'])
self._image_delete(state['blockdev'][self.name]['image'])

7
diskimage_builder/block_device/level1/partitioning.py
View File

@ -198,8 +198,8 @@ class Partitioning(PluginBase):
self._exec_sudo(["kpartx", "-avs", device_path])
def create(self, result, rollback):
image_path = result[self.base]['image']
device_path = result[self.base]['device']
image_path = result['blockdev'][self.base]['image']
device_path = result['blockdev'][self.base]['device']
logger.info("Creating partition on [%s] [%s]" %
(self.base, image_path))
@ -229,7 +229,8 @@ class Partitioning(PluginBase):
logger.debug("Create partition [%s] [%d]" %
(part_name, part_no))
partition_device_name = device_path + "p%d" % part_no
result[part_name] = {'device': partition_device_name}
result['blockdev'][part_name] \
= {'device': partition_device_name}
partition_devices.add(partition_device_name)
self.already_created = True

18
diskimage_builder/lib/disk-image-create
View File

@ -419,19 +419,24 @@ fi
DIB_BLOCK_DEVICE_SCRIPT=$(which dib-block-device)
if [ -z ${IMAGE_BLOCK_DEVICE} ] ; then
# For compatibily reasons in addition to the YAML configuration
# For compatibility reasons in addition to the YAML configuration
# there is the need to handle the old environment variables.
echo "image-size: ${DIB_IMAGE_SIZE}KiB" >> ${DIB_BLOCK_DEVICE_PARAMS_YAML}
# After changeing the parameters, there is the need to
# After changing the parameters, there is the need to
# re-run dib-block-device init because some value might
# change based on the new set parameters.
dib-block-device --phase=init \
--params="${DIB_BLOCK_DEVICE_PARAMS_YAML}"
# values to dib-block-device: using the YAML config and
IMAGE_BLOCK_DEVICE=$(dib-block-device --phase=create \
--params="${DIB_BLOCK_DEVICE_PARAMS_YAML}")
dib-block-device --phase=create \
--params="${DIB_BLOCK_DEVICE_PARAMS_YAML}"
# It's called 'DEVICE' but it's the partition.
IMAGE_BLOCK_DEVICE=$(dib-block-device \
--phase=getval --symbol=image-block-partition \
--params="${DIB_BLOCK_DEVICE_PARAMS_YAML}")
fi
export IMAGE_BLOCK_DEVICE
LOOPDEV=${IMAGE_BLOCK_DEVICE}
@ -496,10 +501,13 @@ fi
# space before converting the image to some other format.
export EXTRA_UNMOUNT=""
unmount_image
TMP_IMAGE_PATH=$(dib-block-device --phase=umount \
TMP_IMAGE_PATH=$(dib-block-device --phase=getval --symbol=image-path \
--params="${DIB_BLOCK_DEVICE_PARAMS_YAML}")
export TMP_IMAGE_PATH
dib-block-device --phase=umount \
--params="${DIB_BLOCK_DEVICE_PARAMS_YAML}"
dib-block-device --phase=cleanup \
--params="${DIB_BLOCK_DEVICE_PARAMS_YAML}"