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ceph-volume util.disk add a PART_ENTRY_TYPE detection utility

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Signed-off-by: Alfredo Deza <adeza@redhat.com>
This commit is contained in:
Alfredo Deza 2018-01-30 09:19:06 -05:00
parent d59b087e50
commit cdb812438d
1 changed files with 21 additions and 0 deletions
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21
src/ceph-volume/ceph_volume/util/disk.py
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@ -3,6 +3,13 @@ import stat
from ceph_volume import process
# The blkid CLI tool has some oddities which prevents having one common call
# to extract the information instead of having separate utilities. The `udev`
# type of output is needed in older versions of blkid (v 2.23) that will not
# work correctly with just the ``-p`` flag to bypass the cache for example.
# Xenial doesn't have this problem as it uses a newer blkid version.
def get_partuuid(device):
"""
If a device is a partition, it will probably have a PARTUUID on it that
@ -15,6 +22,20 @@ def get_partuuid(device):
return ' '.join(out).strip()
def get_part_entry_type(device):
"""
Parses the ``ID_PART_ENTRY_TYPE`` from the "low level" (bypasses the cache)
output that uses the ``udev`` type of output. This output is intended to be
used for udev rules, but it is useful in this case as it is the only
consistent way to retrieve the GUID used by ceph-disk to identify devices.
"""
out, err, rc = process.call(['blkid', '-p', '-o', 'udev', device])
for line in out:
if 'ID_PART_ENTRY_TYPE=' in line:
return line.split('=')[-1].strip()
return ''
def get_device_from_partuuid(partuuid):
"""
If a device has a partuuid, query blkid so that it can tell us what that