def start_container(ctx, container_root, manifest):
"""Treadmill container boot process.
"""
_LOGGER.info('Initializing container: %s', container_root)
app = app_manifest.read(manifest)
cgroup = ctx.obj.get('CGROUP')
try:
# if cgroups set, we need to remount cgroup path
# so that from cgroup directory we only see container pids
# <container_root>/sys/fs/cgroup/memory =>
# /sys/fs/cgroup/memory/treadmill/apps/<app-inst-unique>/services
if cgroup:
remount_cgroup(container_root, cgroup, ctx.obj['ROOT_CGROUP'])
pivot_root.make_root(container_root)
os.chdir('/')
except Exception as err: # pylint: disable=broad-except
event = traceevents.AbortedTraceEvent(
instanceid=app['name'],
why=app_abort.AbortedReason.PIVOT_ROOT.value,
payload=str(err),
)
_abort(event, container_root)
# reraise err to exit start_container
raise err
# XXX: Debug info
_LOGGER.debug('Current mounts: %s',
pprint.pformat(fs_linux.list_mounts()))
subproc.safe_exec(['/services/{}'.format(supervisor.SVC_INIT_FILE)])
def start_container(container_root, manifest):
"""Treadmill container boot process.
"""
_LOGGER.info('Initializing container: %s', container_root)
app = app_manifest.read(manifest)
try:
pivot_root.make_root(container_root)
os.chdir('/')
except Exception as err: # pylint: disable=broad-except
event = traceevents.AbortedTraceEvent(
instanceid=app['name'],
why=app_abort.AbortedReason.PIVOT_ROOT.value,
payload=str(err),
)
_abort(event, container_root)
# reraise err to exit start_container
raise err
# XXX: Debug info
_LOGGER.debug('Current mounts: %s',
pprint.pformat(fs_linux.list_mounts()))
# Clean the environ
# TODO: Remove me once clean environment management is merged in.
os.environ.pop('PYTHONPATH', None)
os.environ.pop('LC_ALL', None)
os.environ.pop('LANG', None)
# Clear aliases path.
os.environ.pop('TREADMILL_ALIASES_PATH', None)
subproc.safe_exec(['s6_svscan', '-s', '/services'])
def start_container(container_root):
"""Treadmill container boot process.
"""
_LOGGER.info('Initializing container: %s', container_root)
# We only preserve anything mounted on the container root.
fs_linux.cleanup_mounts([container_root + '*'], ignore_exc=True)
# Mount a proc in the new namespaces
fs_linux.mount_procfs(container_root)
# remount current proc to /proc
# new process entering container namespace can see the correct /proc
fs_linux.mount_procfs('/')
# Chroot into the container
os.chroot(container_root)
os.chdir('/')
# XXX: Debug info
_LOGGER.debug('Current mounts: %s',
pprint.pformat(fs_linux.list_mounts()))
# Clean the environ
# TODO: Remove me once clean environment management is merged in.
del os.environ['PYTHONPATH']
del os.environ['LC_ALL']
del os.environ['LANG']
subproc.safe_exec(['s6_svscan', '-s', '/services'])
def read_mounted_cgroups(filter_by=CGROOT):
"""Read all the currently mounted cgroups and their mount points.
:params ``str`` filter_by:
Filter out cgroups mounted outside of this path. Set the None/'' to
obtain all mountpoints.
:returns:
``dict`` - Map of cgroup subsystems to their mountpoints list.
"""
availables = _available_subsystems()
mounts = fs_linux.list_mounts()
subsys2mnt = {}
for mount_entry in mounts:
if mount_entry.fs_type != 'cgroup':
continue
for opt in mount_entry.mnt_opts:
if opt in availables:
if not filter_by or mount_entry.target.startswith(filter_by):
subsys2mnt.setdefault(opt, []).append(mount_entry.target)
return subsys2mnt