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# vi: ts=4 expandtab
#
from cloudinit import log as logging
from cloudinit import templater
from cloudinit import util
from cloudinit.settings import PER_INSTANCE
import glob
import six
import tempfile
import os
LOG = logging.getLogger(__name__)
frequency = PER_INSTANCE
SNAPPY_CMD = "snappy"
BUILTIN_CFG = {
'packages': [],
'packages_dir': '/writable/user-data/cloud-init/click_packages',
'ssh_enabled': False,
'system_snappy': "auto",
'configs': {},
}
"""
snappy:
system_snappy: auto
ssh_enabled: True
packages:
- etcd
- pkg2
configs:
pkgname: config-blob
pkgname2: config-blob
"""
def get_fs_package_ops(fspath):
if not fspath:
return []
ops = []
for snapfile in glob.glob(os.path.sep.join([fspath, '*.snap'])):
cfg = snapfile.rpartition(".")[0] + ".config"
name = os.path.basename(snapfile).rpartition(".")[0]
if not os.path.isfile(cfg):
cfg = None
ops.append(makeop('install', name, config=None,
path=snapfile, cfgfile=cfg))
return ops
def makeop(op, name, config=None, path=None, cfgfile=None):
return({'op': op, 'name': name, 'config': config, 'path': path,
'cfgfile': cfgfile})
def get_package_ops(packages, configs, installed=None, fspath=None):
# get the install an config operations that should be done
if installed is None:
installed = read_installed_packages()
if not packages:
packages = []
if not configs:
configs = {}
ops = []
ops += get_fs_package_ops(fspath)
for name in packages:
ops.append(makeop('install', name, configs.get('name')))
to_install = [f['name'] for f in ops]
for name in configs:
if name in installed and name not in to_install:
ops.append(makeop('config', name, config=configs[name]))
# prefer config entries to filepath entries
for op in ops:
name = op['name']
if name in configs and op['op'] == 'install' and 'cfgfile' in op:
LOG.debug("preferring configs[%s] over '%s'", name, op['cfgfile'])
op['cfgfile'] = None
op['config'] = configs[op['name']]
return ops
def render_snap_op(op, name, path=None, cfgfile=None, config=None):
if op not in ('install', 'config'):
raise ValueError("cannot render op '%s'" % op)
try:
cfg_tmpf = None
if config is not None:
if isinstance(config, six.binary_type):
cfg_bytes = config
elif isinstance(config, six.text_type):
cfg_bytes = config.encode()
else:
cfg_bytes = util.yaml_dumps(config)
(fd, cfg_tmpf) = tempfile.mkstemp()
os.write(fd, cfg_bytes)
os.close(fd)
cfgfile = cfg_tmpf
cmd = [SNAPPY_CMD, op]
if op == 'install':
if cfgfile:
cmd.append('--config=' + cfgfile)
if path:
cmd.append(path)
else:
cmd.append(name)
elif op == 'config':
cmd += [name, cfgfile]
util.subp(cmd)
finally:
if cfg_tmpf:
os.unlink(cfg_tmpf)
def read_installed_packages():
return [p[0] for p in read_pkg_data()]
def read_pkg_data():
out, err = util.subp([SNAPPY_CMD, "list"])
for line in out.splitlines()[1:]:
toks = line.split(sep=None, maxsplit=3)
if len(toks) == 3:
(name, date, version) = toks
dev = None
else:
(name, date, version, dev) = toks
pkgs.append((name, date, version, dev,))
def disable_enable_ssh(enabled):
LOG.debug("setting enablement of ssh to: %s", enabled)
# do something here that would enable or disable
not_to_be_run = "/etc/ssh/sshd_not_to_be_run"
if enabled:
util.del_file(not_to_be_run)
# this is an indempotent operation
util.subp(["systemctl", "start", "ssh"])
else:
# this is an indempotent operation
util.subp(["systemctl", "stop", "ssh"])
util.write_file(not_to_be_run, "cloud-init\n")
def system_is_snappy():
# channel.ini is configparser loadable.
# snappy will move to using /etc/system-image/config.d/*.ini
# this is certainly not a perfect test, but good enough for now.
content = util.load_file("/etc/system-image/channel.ini", quiet=True)
if 'ubuntu-core' in content.lower():
return True
if os.path.isdir("/etc/system-image/config.d/"):
return True
return False
def handle(name, cfg, cloud, log, args):
cfgin = cfg.get('snappy')
if not cfgin:
cfgin = {}
mycfg = util.mergemanydict([cfgin, BUILTIN_CFG])
sys_snappy = str(mycfg.get("system_snappy", "auto"))
if util.is_false(sys_snappy):
LOG.debug("%s: System is not snappy. disabling", name)
return
if sys_snappy.lower() == "auto" and not(system_is_snappy()):
LOG.debug("%s: 'auto' mode, and system not snappy", name)
return
pkg_ops = get_package_ops(packages=mycfg['packages'],
configs=mycfg['configs'],
fspath=mycfg['packages_dir'])
fails = []
for pkg_op in pkg_ops:
try:
render_snap_op(op=pkg_op['op'], name=pkg_op['name'],
cfgfile=pkg_op['cfgfile'], config=pkg_op['config'])
except Exception as e:
fails.append((pkg_op, e,))
LOG.warn("'%s' failed for '%s': %s",
pkg_op['op'], pkg_op['name'], e)
disable_enable_ssh(mycfg.get('ssh_enabled', False))
if fails:
raise Exception("failed to install/configure snaps")
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