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"""Generic host utility functions.
Generic utility functions not specifc to a larger suite of tools.
For example, not specific to OCP, Gluster, Heketi, etc.
"""
import random
import re
import string
from glusto.core import Glusto as g
ONE_GB_BYTES = 1073741824.0
def get_device_size(host, device_name):
"""Gets device size for the given device name.
Args:
host (str): Node in command will be executed.
device_name (str): device name for which the size has to
be calculated.
Returns:
str : returns device size in GB on success
False otherwise
Example:
get_device_size(host, device_name)
"""
cmd = "fdisk -l %s " % device_name
ret, out, _ = g.run(host, cmd)
if ret != 0:
g.log.error("Failed to execute fdisk -l command "
"on node %s" % host)
return False
regex = 'Disk\s' + device_name + '.*?,\s(\d+)\sbytes\,.*'
match = re.search(regex, out)
if match is None:
g.log.error("Regex mismatch while parsing fdisk -l output")
return False
return str(int(int(match.group(1))/ONE_GB_BYTES))
def get_random_str(size=14):
chars = string.ascii_lowercase + string.digits
return ''.join(random.choice(chars) for _ in range(size))
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