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import subprocess
from charmhelpers.core.strutils import BasicStringComparator
UBUNTU_RELEASES = (
'lucid',
'maverick',
'natty',
'oneiric',
'precise',
'quantal',
'raring',
'saucy',
'trusty',
'utopic',
'vivid',
'wily',
'xenial',
'yakkety',
'zesty',
'artful',
)
class CompareHostReleases(BasicStringComparator):
"""Provide comparisons of Ubuntu releases.
Use in the form of
if CompareHostReleases(release) > 'trusty':
# do something with mitaka
"""
_list = UBUNTU_RELEASES
def service_available(service_name):
"""Determine whether a system service is available"""
try:
subprocess.check_output(
['service', service_name, 'status'],
stderr=subprocess.STDOUT).decode('UTF-8')
except subprocess.CalledProcessError as e:
return b'unrecognized service' not in e.output
else:
return True
def add_new_group(group_name, system_group=False, gid=None):
cmd = ['addgroup']
if gid:
cmd.extend(['--gid', str(gid)])
if system_group:
cmd.append('--system')
else:
cmd.extend([
'--group',
])
cmd.append(group_name)
subprocess.check_call(cmd)
def lsb_release():
"""Return /etc/lsb-release in a dict"""
d = {}
with open('/etc/lsb-release', 'r') as lsb:
for l in lsb:
k, v = l.split('=')
d[k.strip()] = v.strip()
return d
def cmp_pkgrevno(package, revno, pkgcache=None):
"""Compare supplied revno with the revno of the installed package.
* 1 => Installed revno is greater than supplied arg
* 0 => Installed revno is the same as supplied arg
* -1 => Installed revno is less than supplied arg
This function imports apt_cache function from charmhelpers.fetch if
the pkgcache argument is None. Be sure to add charmhelpers.fetch if
you call this function, or pass an apt_pkg.Cache() instance.
"""
import apt_pkg
if not pkgcache:
from charmhelpers.fetch import apt_cache
pkgcache = apt_cache()
pkg = pkgcache[package]
return apt_pkg.version_compare(pkg.current_ver.ver_str, revno)
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