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NetworkManager/examples/python/gi/ovs-external-ids.py
Thomas Haller c45041f1fc examples: extend "ovs-external-ids.py" to support nmcli device modify 
The python example is (also) used to test the feature. That is because
currently nmcli does not yet have support for ovs.external-ids and this
API is only accessible via D-Bus (or a tool like this example).
2020-11-17 19:49:03 +01:00

664 lines
18 KiB
Python
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#!/usr/bin/env python
# SPDX-License-Identifier: GPL-2.0+
#
# Copyright (C) 2017, 2020 Red Hat, Inc.
#
#
# set and show OVS external-ids for a connection:
#
import sys
import os
import re
import pprint
import subprocess
import gi
gi.require_version("NM", "1.0")
from gi.repository import GLib, NM
###############################################################################
MODE_GET = "get"
MODE_SET = "set"
MODE_APPLY = "apply"
def memoize0(f):
result = []
def helper():
if len(result) == 0:
result.append(f())
return result[0]
return helper
def memoize(f):
memo = {}
def helper(x):
if x not in memo:
memo[x] = f(x)
return memo[x]
return helper
def pr(v):
pprint.pprint(v, indent=4, depth=5, width=60)
@memoize0
def is_libnm_debug():
return os.getenv("LIBNM_CLIENT_DEBUG") is not None
@memoize0
def can_sudo():
try:
return (
subprocess.run(
["sudo", "-n", "true"],
stdout=subprocess.DEVNULL,
stderr=subprocess.DEVNULL,
).returncode
== 0
)
except:
return False
def _print(msg=""):
if is_libnm_debug():
# we want to use the same logging mechanism as libnm's debug
# logging with "LIBNM_CLIENT_DEBUG=trace,stdout".
NM.utils_print(0, msg + "\n")
return
print(msg)
def mainloop_run(timeout_msec=0, mainloop=None):
if mainloop is None:
mainloop = GLib.MainLoop()
timeout_id = None
timeout_reached = []
if timeout_msec > 0:
def _timeout_cb(unused):
# it can happen that the caller already quit the mainloop
# otherwise. In that case, we don't want to signal a timeout.
if mainloop.is_running():
timeout_reached.append(1)
mainloop.quit()
return True
timeout_id = GLib.timeout_add(timeout_msec, _timeout_cb, None)
mainloop.run()
if timeout_id:
GLib.source_remove(timeout_id)
return not timeout_reached
###############################################################################
def connection_update2(remote_connection, connection):
mainloop = GLib.MainLoop()
result_error = []
def cb(c, result):
try:
c.update2_finish(result)
except Exception as e:
result_error.append(e)
mainloop.quit()
remote_connection.update2(
connection.to_dbus(NM.ConnectionSerializationFlags.ALL),
NM.SettingsUpdate2Flags.NO_REAPPLY,
None,
None,
cb,
)
mainloop_run(mainloop=mainloop)
if result_error:
raise result_error[0]
def device_get_applied_connection(device):
mainloop = GLib.MainLoop()
rr = []
def cb(c, result):
try:
con, version_id = c.get_applied_connection_finish(result)
except Exception as e:
rr.append(e)
else:
rr.append(con)
rr.append(version_id)
mainloop.quit()
device.get_applied_connection_async(0, None, cb)
mainloop_run(mainloop=mainloop)
if len(rr) == 1:
raise rr[0]
return rr[0], rr[1]
def device_reapply(device, connection, version_id):
mainloop = GLib.MainLoop()
result_error = []
def cb(d, result):
try:
d.reapply_finish(result)
except Exception as e:
result_error.append(e)
mainloop.quit()
device.reapply_async(connection, version_id, 0, None, cb)
mainloop_run(mainloop=mainloop)
if len(result_error) == 1:
raise result_error[0]
def ovs_print_external_ids(prefix):
if not can_sudo():
_print(prefix + ": not running as root and cannot call ovs-vsctl")
return
cmds = [["ovs-vsctl", "show"]]
for typ in ["Bridge", "Port", "Interface"]:
cmds += [["ovs-vsctl", "--columns=name,external-ids", "list", typ]]
out = ""
for cmd in cmds:
p = subprocess.run(cmd, stdout=subprocess.PIPE, check=True,)
out += p.stdout.decode("utf-8") + "\n"
out = "\n".join([prefix + s for s in out.split("\n")])
_print(out)
###############################################################################
def usage():
_print("%s g[et] PROFILE [ GETTER ]" % (sys.argv[0]))
_print("%s s[et] PROFILE SETTER [--test]" % (sys.argv[0]))
_print("%s a[pply] DEVICE SETTER [--test]" % (sys.argv[0]))
_print(
" PROFILE := [id | uuid | type] STRING | [ ~id | ~type ] REGEX_STRING | STRING"
)
_print(" DEVICE := [iface] STRING")
_print(" GETTER := ( KEY | ~REGEX_KEY ) [... GETTER]")
_print(" SETTER := ( + | - | -KEY | [+]KEY VALUE ) [... SETTER]")
def die(msg, show_usage=False):
_print("FAILED: %s" % (msg))
if show_usage:
usage()
sys.exit(1)
def die_usage(msg):
die(msg, show_usage=True)
def parse_args(argv):
had_dash_dash = False
args = {
"mode": MODE_GET,
"select_arg": None,
"ids_arg": [],
"do_test": False,
}
i = 1
while i < len(argv):
a = argv[i]
if i == 1:
if a in ["s", "set"]:
args["mode"] = MODE_SET
elif a in ["g", "get"]:
args["mode"] = MODE_GET
elif a in ["a", "apply"]:
args["mode"] = MODE_APPLY
else:
die_usage("unexpected mode argument '%s'" % (a))
i += 1
continue
if a == "--test":
args["do_test"] = True
i += 1
continue
if args["select_arg"] is None:
if args["mode"] == MODE_APPLY:
possible_selects = ["iface"]
else:
possible_selects = ["id", "~id", "uuid", "type", "~type"]
if a in possible_selects:
if i + 1 >= len(argv):
die_usage("'%s' requires an argument'" % (a))
args["select_arg"] = (a, argv[i + 1])
i += 2
continue
if a == "*":
a = None
args["select_arg"] = ("*", a)
i += 1
continue
if args["mode"] == MODE_GET:
args["ids_arg"].append(a)
i += 1
continue
if not a:
die_usage("argument should specify a external-id but is empty string")
if a[0] == "-":
v = (a, None)
i += 1
elif a == "+":
v = (a, None)
i += 1
else:
if a[0] != "+":
a = "+" + a
if i + 1 >= len(argv):
die_usage("'%s' requires an argument'" % (a))
v = (a, argv[i + 1])
i += 2
args["ids_arg"].append(v)
if args["mode"] == MODE_SET:
if not args["ids_arg"]:
die_usage("Requires one or more external-ids to set or delete")
return args
def device_to_str(device, show_type=False):
if show_type:
return "%s (%s)" % (device.get_iface(), device.get_type_desc())
return "%s" % (device.get_iface(),)
def connection_to_str(connection, show_type=False):
if show_type:
return "%s (%s, %s)" % (
connection.get_id(),
connection.get_uuid(),
connection.get_connection_type(),
)
return "%s (%s)" % (connection.get_id(), connection.get_uuid())
def devices_filter(devices, select_arg):
devices = list(sorted(devices, key=device_to_str))
if not select_arg:
return devices
# we preserve the order of the selected devices. And
# if devices are selected multiple times, we return
# them multiple times.
l = []
f = select_arg
for d in devices:
if f[0] == "iface":
if f[1] == d.get_iface():
l.append(d)
else:
assert f[0] == "*"
if f[1] is None:
l.append(d)
else:
if f[1] in [d.get_iface()]:
l.append(d)
return l
def connections_filter(connections, select_arg):
connections = list(sorted(connections, key=connection_to_str))
if not select_arg:
return connections
# we preserve the order of the selected connections. And
# if connections are selected multiple times, we return
# them multiple times.
l = []
f = select_arg
for c in connections:
if f[0] == "id":
if f[1] == c.get_id():
l.append(c)
elif f[0] == "~id":
if re.match(f[1], c.get_id()):
l.append(c)
elif f[0] == "uuid":
if f[1] == c.get_uuid():
l.append(c)
elif f[0] == "type":
if f[1] == c.get_connection_type():
l.append(c)
elif f[0] == "~type":
if re.match(f[1], c.get_connection_type()):
l.append(c)
else:
assert f[0] == "*"
if f[1] is None:
l.append(c)
else:
if f[1] in [c.get_uuid(), c.get_id()]:
l.append(c)
return l
def ids_select(ids, mode, ids_arg):
ids = list(ids)
if not ids_arg:
return (ids, [])
keys = set()
requested = []
for d in ids_arg:
if mode == MODE_GET:
if d[0] == "~":
r = re.compile(d[1:])
keys.update([k for k in ids if r.match(k)])
else:
keys.update([k for k in ids if k == d])
if d not in requested:
requested.append(d)
else:
assert mode in [MODE_SET, MODE_APPLY]
d2 = d[0]
assert d2[0] in ["-", "+"]
d3 = d2[1:]
if d3 in ids:
keys.add(d3)
return (list([k for k in ids if k in keys]), requested)
def connection_print(connection, mode, ids_arg, dbus_path, prefix=""):
sett = connection.get_setting(NM.SettingOvsExternalIDs)
if sett is not None:
all_ids = list(sett.get_data_keys())
keys, requested = ids_select(all_ids, mode, ids_arg)
num_str = "%s" % (len(all_ids))
else:
keys = []
requested = []
num_str = "none"
_print(
"%s%s [%s]" % (prefix, connection_to_str(connection, show_type=True), num_str)
)
if dbus_path:
_print("%s %s" % (prefix, dbus_path))
if sett is not None:
dd = sett.get_property(NM.SETTING_OVS_EXTERNAL_IDS_DATA)
else:
dd = {}
for k in keys:
v = sett.get_data(k)
assert v is not None
assert v == dd.get(k, None)
_print('%s "%s" = "%s"' % (prefix, k, v))
for k in requested:
_print('%s "%s" = <unset>' % (prefix, k))
def sett_update(connection, ids_arg):
sett = connection.get_setting(NM.SettingOvsExternalIDs)
for d in ids_arg:
op = d[0][0]
key = d[0][1:]
val = d[1]
oldval = None
if sett is not None:
oldval = sett.get_data(key)
if op == "-":
assert val is None
if key == "":
if sett is None:
_print(" DEL: setting (ovs-external-ids group was not present)")
else:
connection.remove_setting(NM.SettingOvsExternalIDs)
sett = None
_print(" DEL: setting")
continue
if sett is None:
_print(' DEL: "%s" (ovs-external-ids group was not present)' % (key))
continue
if oldval is None:
_print(' DEL: "%s" (id was unset)' % (key))
continue
_print(' DEL: "%s" (id was set to"%s")' % (key, oldval))
sett.set_data(key, None)
continue
if key == "":
assert val is None
if sett is None:
sett = NM.SettingOvsExternalIDs.new()
connection.add_setting(sett)
_print(" SET: setting (external-ids group was added)")
continue
_print(" SET: setting (external-ids group was present)")
continue
assert val is not None
if sett is None:
sett = NM.SettingOvsExternalIDs.new()
connection.add_setting(sett)
_print(
' SET: "%s" = "%s" (external-ids group was not present)' % (key, val)
)
elif oldval is None:
_print(' SET: "%s" = "%s" (new)' % (key, val))
elif oldval != val:
_print(' SET: "%s" = "%s" (was "%s")' % (key, val, oldval))
else:
_print(' SET: "%s" = "%s" (unchanged)' % (key, val))
sett.set_data(key, val)
def do_get(connections, ids_arg):
first_line = True
for c in connections:
if first_line:
first_line = False
else:
_print()
connection_print(c, MODE_GET, ids_arg, dbus_path=c.get_path())
def do_set(nmc, connection, ids_arg, do_test):
remote_connection = connection
connection = NM.SimpleConnection.new_clone(remote_connection)
connection_print(
connection, MODE_SET, [], remote_connection.get_path(), prefix="BEFORE: "
)
_print()
sett_update(connection, ids_arg)
if do_test:
_print()
_print("Only show. Run without --test to set")
return
try:
connection_update2(remote_connection, connection)
except Exception as e:
_print()
_print("FAILURE to commit connection: %s" % (e))
return
# NMClient received the completion of Update2() call. It also received
# a property changed signal that the profile changed, and it is about
# to fetch the new value. However, that value is not yet here.
#
# libnm should provide a better API for this. For example, not signal
# completion of update2() until the profile was refetched. Or, indicate
# that the settings are dirty, so we would know how long to wait.
#
# Add an ugly workaround here and wait a bit.
_print()
_print("WORKAROUND: wait for connection to change")
mainloop_run(timeout_msec=500)
if remote_connection is not nmc.get_object_by_path(remote_connection.get_path()):
_print()
_print(
"Connection %s no longer exists after commit"
% (remote_connection.get_path())
)
return
_print()
connection_print(
remote_connection, MODE_SET, [], remote_connection.get_path(), prefix="AFTER: "
)
_print()
if remote_connection.compare(connection, NM.SettingCompareFlags.EXACT):
_print("resulting connection is as expected")
else:
_print("WARNING: resulting connection is not as expected")
def do_apply(nmc, device, ids_arg, do_test):
try:
connection_orig, version_id = device_get_applied_connection(device)
except Exception as e:
_print(
'failure to get applied connection for %s: %s"' % (device_to_str(device), e)
)
die("The device does not seem active? Nothing to reapply")
_print(
"REAPPLY device %s (%s) with connection %s (version-id = %s)"
% (
device_to_str(device),
NM.Object.get_path(device),
connection_to_str(connection_orig),
version_id,
)
)
_print()
ovs_print_external_ids("BEFORE-OVS-VSCTL: ")
_print()
connection = NM.SimpleConnection.new_clone(connection_orig)
connection_print(connection, MODE_APPLY, [], device.get_path(), prefix="BEFORE: ")
_print()
sett_update(connection, ids_arg)
if do_test:
_print()
_print("Only show. Run without --test to set")
return
_print()
_print("reapply...")
try:
device_reapply(device, connection, version_id)
except Exception as e:
_print()
_print("FAILURE to commit connection: %s" % (e))
return
try:
connection_after, version_id = device_get_applied_connection(device)
except Exception as e:
_print(
'failure to get applied connection after reapply for device %s: %s"'
% (device_to_str(device), e)
)
die("FAILURE to get applied connection after reapply")
_print()
connection_print(connection, MODE_APPLY, [], device.get_path(), prefix="AFTER: ")
_print()
ovs_print_external_ids("AFTER-OVS-VSCTL: ")
###############################################################################
if __name__ == "__main__":
args = parse_args(sys.argv)
nmc = NM.Client.new(None)
if args["mode"] == MODE_APPLY:
devices = devices_filter(nmc.get_devices(), args["select_arg"])
if len(devices) != 1:
_print(
"To apply the external-ids of a device, exactly one connection must be selected. Instead, %s devices matched ([%s])"
% (len(devices), ", ".join([device_to_str(c) for c in devices]),)
)
die_usage("Select unique device to apply")
do_apply(nmc, devices[0], args["ids_arg"], do_test=args["do_test"])
else:
connections = connections_filter(nmc.get_connections(), args["select_arg"])
if args["mode"] == MODE_SET:
if len(connections) != 1:
_print(
"To set the external-ids of a connection, exactly one connection must be selected via id|uuid. Instead, %s connection matched ([%s])"
% (
len(connections),
", ".join([connection_to_str(c) for c in connections]),
)
)
die_usage("Select unique connection to set")
do_set(nmc, connections[0], args["ids_arg"], do_test=args["do_test"])
else:
if len(connections) < 1:
_print("No connection selected for printing the external ids")
die_usage("Select connection to get")
do_get(connections, args["ids_arg"])
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