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An example on how to use pyparted to create partitions on disk
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#!/usr/bin/env python | |
# | |
# Requirements: | |
# - python | |
# - python-dev | |
# - pyparted | |
import parted | |
# Create a disk image then attach it to a loopback device (e.g. /dev/loop0) | |
''' | |
dd if=/dev/zero of=disk.img bs=512 count=2097152 | |
losetup -f disk.img | |
kpartx -a /dev/loop0 | |
''' | |
device = '/dev/loop0' | |
loop0 = parted.getDevice(device) | |
loop0.clobber() # destroy existing partition table | |
disk = parted.newDisk(loop0) | |
# create partition 1 | |
geometry1 = parted.Geometry(start=0, | |
length=parted.sizeToSectors(48, 'MiB', loop0.sectorSize), | |
device=loop0) | |
filesystem1 = parted.FileSystem(type='fat32', geometry=geometry1) | |
partition1 = parted.Partition(disk=disk, | |
type=parted.PARTITION_BOOT, | |
fs=filesystem1, | |
geometry=geometry1) | |
disk.addPartition(partition1, constraint=loop0.optimalAlignedConstraint) | |
disk.commit() | |
# partition 2 | |
geometry2 = parted.Geometry(start=partition1.geometry.end, | |
length=parted.sizeToSectors(256, 'MiB', loop0.sectorSize), | |
device=loop0) | |
filesystem2 = parted.FileSystem(type='ext4', geometry=geometry2) | |
partition2 = parted.Partition(disk=disk, | |
type=parted.PARTITION_NORMAL, | |
fs=filesystem2, | |
geometry=geometry2) | |
disk.addPartition(partition2, constraint=loop0.optimalAlignedConstraint) | |
disk.commit() | |
# partition 3 | |
geometry3 = parted.Geometry(start=partition2.geometry.end, | |
length=parted.sizeToSectors(256, 'MiB', loop0.sectorSize), | |
device=loop0) | |
filesystem3 = parted.FileSystem(type='ext4', geometry=geometry3) | |
partition3 = parted.Partition(disk=disk, | |
type=parted.PARTITION_NORMAL, | |
fs=filesystem3, | |
geometry=geometry3) | |
disk.addPartition(partition3, constraint=loop0.optimalAlignedConstraint) | |
disk.commit() | |
# partition 4: Extended | |
geometry4 = parted.Geometry(start=partition3.geometry.end, | |
end=loop0.length, | |
device=loop0) | |
partition4 = parted.Partition(disk=disk, | |
type=parted.PARTITION_EXTENDED, | |
geometry=geometry4) | |
disk.addPartition(partition4, constraint=loop0.optimalAlignedConstraint) | |
disk.commit() | |
# partition 5: Logical | |
geometry5 = parted.Geometry(start=partition4.geometry.start, | |
length=parted.sizeToSectors(48, 'MiB', loop0.sectorSize), | |
device=loop0) | |
filesystem5 = parted.FileSystem(type='btrfs', geometry=geometry5) | |
partition5 = parted.Partition(disk=disk, | |
type=parted.PARTITION_EXTENDED, | |
fs=filesystem5, | |
geometry=geometry5) | |
disk.addPartition(partition5, constraint=loop0.optimalAlignedConstraint) | |
disk.commit() | |
# partition 6: Logical | |
geometry6 = parted.Geometry(start=partition5.geometry.start, | |
end=partition4.geometry.end, | |
device=loop0) | |
filesystem6 = parted.FileSystem(type='btrfs', geometry=geometry6) | |
partition6 = parted.Partition(disk=disk, | |
type=parted.PARTITION_EXTENDED, | |
fs=filesystem6, | |
geometry=geometry6) | |
disk.addPartition(partition6, constraint=loop0.optimalAlignedConstraint) | |
disk.commit() | |
### Example of resizing a partition | |
### source: https://github.com/dcantrell/pyparted/issues/38 | |
''' | |
device = parted.Device(image) | |
disk = parted.Disk(device) | |
partition = disk.partitions[0] | |
start = partition.geometry.start | |
end = device.length | |
geom = parted.Geometry(device=device, start=start, length=end-start) | |
constraint = parted.Constraint(exactGeom=geom) | |
disk.maximizePartition(partition=partition, constraint=constraint) | |
disk.commit() | |
''' |
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This is a good starting example but (ignoring the extended partitions) it won't quite work for GPT partitions. You might need to use
disk.getFreeSpaceRegions()
to determine allowed starting/end positions.