def _before_link_dm_node(self, e):
"""Links the volume using the device mapper
This allows us to create a 'window' into the volume that acts like a volum in itself.
Mainly it is used to fool grub into thinking that it is working with a real volume,
rather than a loopback device or a network block device.
Args:
e (_e_obj): Event object containing arguments to create()
Arguments are:
logical_start_sector (int): The sector the volume should start at in the new volume
start_sector (int): The offset at which the volume should begin to be mapped in the new volume
sectors (int): The number of sectors that should be mapped
Read more at: http://manpages.debian.org/cgi-bin/man.cgi?query=dmsetup&apropos=0&sektion=0&manpath=Debian+7.0+wheezy&format=html&locale=en
Raises:
VolumeError
"""
import os.path
from common.fs import get_partitions
# Fetch information from /proc/partitions
proc_partitions = get_partitions()
device_name = os.path.basename(self.device_path)
device_partition = proc_partitions[device_name]
# The sector the volume should start at in the new volume
logical_start_sector = getattr(e, 'logical_start_sector', 0)
# The offset at which the volume should begin to be mapped in the new volume
start_sector = getattr(e, 'start_sector', 0)
# The number of sectors that should be mapped
sectors = getattr(e, 'sectors', int(self.size / 512) - start_sector)
# This is the table we send to dmsetup, so that it may create a decie mapping for us.
table = ('{log_start_sec} {sectors} linear {major}:{minor} {start_sec}'
.format(log_start_sec=logical_start_sector,
sectors=sectors,
major=device_partition['major'],
minor=device_partition['minor'],
start_sec=start_sector))
import string
import os.path
# Figure out the device letter and path
for letter in string.ascii_lowercase:
dev_name = 'vd' + letter
dev_path = os.path.join('/dev/mapper', dev_name)
if not os.path.exists(dev_path):
self.dm_node_name = dev_name
self.dm_node_path = dev_path
break
if not hasattr(self, 'dm_node_name'):
raise VolumeError('Unable to find a free block device path for mounting the bootstrap volume')
# Create the device mapping
log_check_call(['dmsetup', 'create', self.dm_node_name], table)
# Update the device_path but remember the old one for when we unlink the volume again
self.unlinked_device_path = self.device_path
self.device_path = self.dm_node_path
def _before_link_dm_node(self, e):
import os.path
from common.fs import get_partitions
proc_partitions = get_partitions()
device_name = os.path.basename(self.device_path)
device_partition = proc_partitions[device_name]
# The sector the volume should start at in the new volume
logical_start_sector = getattr(e, 'logical_start_sector', 0)
# The offset at which the volume should begin to be mapped in the new volume
start_sector = getattr(e, 'start_sector', 0)
sectors = getattr(e, 'sectors', int(self.size / 512) - start_sector)
table = ('{log_start_sec} {sectors} linear {major}:{minor} {start_sec}'
.format(log_start_sec=logical_start_sector,
sectors=sectors,
major=device_partition['major'],
minor=device_partition['minor'],
start_sec=start_sector))
import string
import os.path
for letter in string.ascii_lowercase:
dev_name = 'vd' + letter
dev_path = os.path.join('/dev/mapper', dev_name)
if not os.path.exists(dev_path):
self.dm_node_name = dev_name
self.dm_node_path = dev_path
break
if not hasattr(self, 'dm_node_name'):
raise VolumeError('Unable to find a free block device path for mounting the bootstrap volume')
log_check_call(['/sbin/dmsetup', 'create', self.dm_node_name], table)
self.unlinked_device_path = self.device_path
self.device_path = self.dm_node_path
def _before_link_dm_node(self, e):
"""Links the volume using the device mapper
This allows us to create a 'window' into the volume that acts like a volum in itself.
Mainly it is used to fool grub into thinking that it is working with a real volume,
rather than a loopback device or a network block device.
Args:
e (_e_obj): Event object containing arguments to create()
Arguments are:
logical_start_sector (int): The sector the volume should start at in the new volume
start_sector (int): The offset at which the volume should begin to be mapped in the new volume
sectors (int): The number of sectors that should be mapped
Read more at: http://manpages.debian.org/cgi-bin/man.cgi?query=dmsetup&apropos=0&sektion=0&manpath=Debian+7.0+wheezy&format=html&locale=en
Raises:
VolumeError
"""
import os.path
from common.fs import get_partitions
# Fetch information from /proc/partitions
proc_partitions = get_partitions()
device_name = os.path.basename(self.device_path)
device_partition = proc_partitions[device_name]
# The sector the volume should start at in the new volume
logical_start_sector = getattr(e, 'logical_start_sector', 0)
# The offset at which the volume should begin to be mapped in the new volume
start_sector = getattr(e, 'start_sector', 0)
# The number of sectors that should be mapped
sectors = getattr(e, 'sectors', int(self.size / 512) - start_sector)
# This is the table we send to dmsetup, so that it may create a decie mapping for us.
table = ('{log_start_sec} {sectors} linear {major}:{minor} {start_sec}'
.format(log_start_sec=logical_start_sector,
sectors=sectors,
major=device_partition['major'],
minor=device_partition['minor'],
start_sec=start_sector))
import string
import os.path
# Figure out the device letter and path
for letter in string.ascii_lowercase:
dev_name = 'vd' + letter
dev_path = os.path.join('/dev/mapper', dev_name)
if not os.path.exists(dev_path):
self.dm_node_name = dev_name
self.dm_node_path = dev_path
break
if not hasattr(self, 'dm_node_name'):
raise VolumeError(
'Unable to find a free block device path for mounting the bootstrap volume'
)
# Create the device mapping
log_check_call(['dmsetup', 'create', self.dm_node_name], table)
# Update the device_path but remember the old one for when we unlink the volume again
self.unlinked_device_path = self.device_path
self.device_path = self.dm_node_path
def _is_nbd_used(self, device_name): return device_name in get_partitions()
def _is_nbd_used(self, device_name): return device_name in get_partitions()