/usr/lib/python3/dist-packages/UbuntuSystemService/backend.py is in ubuntu-system-service 0.3.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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import dbus
import dbus.service
import dbus.mainloop.glib
dbus.mainloop.glib.DBusGMainLoop(set_as_default=True)
import os
import subprocess
import apt_pkg
import struct
import fcntl
from UbuntuSystemService.utils import *
class ServiceBackend(dbus.service.Object):
"""
the main backend class that supports various system settings like
proxy and keyboard
"""
# some class properties
DBUS_INTERFACE_NAME = "com.ubuntu.SystemService"
SUPPORTED_PROXIES = ("http","ftp", "https", "socks")
# default files
DPKG_LOCK = "/var/lib/dpkg/lock"
APT_ARCHIVES_LOCK = "/var/cache/apt/archives/lock"
APT_LISTS_LOCK = "/var/lib/apt/lists/lock"
UNATTENDED_UPGRADES_LOCK = "/var/run/unattended-upgrades.lock"
def __init__(self, bus=None):
if bus is None:
bus = dbus.SystemBus()
bus_name = dbus.service.BusName(self.DBUS_INTERFACE_NAME,
bus=bus)
dbus.service.Object.__init__(self, bus_name, '/')
apt_pkg.init_config()
# proxy stuff ---------------------------------------------------
def _etc_environment_proxy(self, proxy_type):
" internal that returns the /etc/environment proxy "
if not os.path.exists("/etc/environment"):
return ""
for line in open("/etc/environment"):
if line.startswith("%s_proxy=" % proxy_type):
(key, value) = line.strip().split("=")
value = value.strip('"')
return value
return ""
def _http_proxy(self):
" internal helper that returns the current http proxy "
apt_proxy = self._apt_proxy("http")
env_proxy = self._etc_environment_proxy("http")
# FIXME: what to do if both proxies are differnet?
return env_proxy
def _apt_proxy(self, proxy_type):
" internal helper that returns the configured apt proxy"
apt_pkg.init_config()
proxy = apt_pkg.config.find("Acquire::%s::proxy" % proxy_type)
return proxy
def _ftp_proxy(self):
apt_proxy = self._apt_proxy("ftp")
env_proxy = self._etc_environment_proxy("ftp")
# FIXME: what to do if both proxies are differnet?
return env_proxy
def _socks_proxy(self):
env_proxy = self._etc_environment_proxy("socks")
return env_proxy
def _ftp_apt_proxy(self):
" internal helper that returns the configured apt proxy"
apt_pkg.init_config()
http_proxy = apt_pkg.config.find("Acquire::ftp::proxy")
return http_proxy
def _https_proxy(self):
" internal helper that returns the current https proxy "
env_proxy = self._etc_environment_proxy("https")
return env_proxy
def _verify_proxy(self, proxy_type, proxy):
" internal helper, verify that the proxy string is valid "
return verify_proxy(proxy_type, proxy)
def _verify_no_proxy(self, proxy):
" internal helper, verify that the no_proxy string is valid "
return verify_no_proxy(proxy)
@dbus.service.method(DBUS_INTERFACE_NAME,
in_signature='s',
out_signature='s',
sender_keyword='sender',
connection_keyword='conn')
def get_proxy(self, proxy_type, sender=None, conn=None):
"""
Get the current system-wide proxy for type "proxy_type"
This function will look in the apt configuration to
find the current http proxy.
"""
if proxy_type == "http":
return self._http_proxy()
if proxy_type == "https":
return self._https_proxy()
elif proxy_type == "ftp":
return self._ftp_proxy()
elif proxy_type == "socks":
return self._socks_proxy()
raise UnknownProxyTypeError("proxy_type '%s' is unknown in get_proxy" % proxy_type)
def _write_apt_proxy(self, proxy_type, new_proxy):
" helper that writes the new apt proxy "
confdir = apt_pkg.config.find_dir("Dir::Etc")
if not self._verify_proxy(proxy_type, new_proxy):
return False
# now the difficult case (search the apt configuration files)
# build the list of apt configuration files first
apt_conffiles = [os.path.join(confdir,"apt.conf.d",n) for n in
os.listdir(os.path.join(confdir,"apt.conf.d"))]
apt_conffiles.insert(0, os.path.join(confdir,"apt.conf"))
# then scan them for the content
already_saved = False
for f in apt_conffiles:
new_content = []
found = False
try:
file = open(f)
for line in file:
# Only replace the Acquire::%s::proxy entry, not other more
# complicated forms of the proxy settings
if line.lower().startswith("acquire::%s::proxy " % proxy_type):
if already_saved:
continue
found = True
line = "Acquire::%s::proxy \"%s\";\n" % (proxy_type, new_proxy)
already_saved = True
new_content.append(line)
except Exception:
pass
# if we didn't find the proxy, write it out now
if not found and not already_saved:
new_content.append("Acquire::%s::proxy \"%s\";\n" % (proxy_type, new_proxy))
already_saved = True
open(f,"w").write("".join(new_content))
return True
def _write_etc_environment_proxy(self, proxy_type, new_proxy):
if not self._verify_proxy(proxy_type, new_proxy):
return False
found=False
new_content=[]
new_proxy_line = '%s_proxy="%s"\n' % (proxy_type, new_proxy)
for line in open("/etc/environment"):
if line.startswith("%s_proxy=" % proxy_type):
line=new_proxy_line
found = True
new_content.append(line)
if found:
open("/etc/environment","w").write("".join(new_content))
else:
open("/etc/environment","a").write(new_proxy_line)
return True
def _clear_etc_environment_proxy(self, proxy_type):
found=False
new_content=[]
for line in open("/etc/environment"):
if line.startswith("%s_proxy=" % proxy_type):
found = True
else:
new_content.append(line)
if found:
open("/etc/environment","w").write("".join(new_content))
return True
def _clear_apt_proxy(self, proxy_type):
" helper that clears the apt proxy "
confdir = apt_pkg.config.find_dir("Dir::Etc")
apt_conffiles = [os.path.join(confdir,"apt.conf.d",n) for n in
os.listdir(os.path.join(confdir,"apt.conf.d"))]
apt_conffiles.insert(0, os.path.join(confdir,"apt.conf"))
for f in apt_conffiles:
new_content = []
found = False
for line in open(f):
# Only remove the Acquire::%s::proxy entry, not other more
# complicated forms of the proxy settings
if line.lower().startswith("acquire::%s::proxy " % proxy_type):
found = True
else:
new_content.append(line)
# if we found/replaced the proxy, write it out now
if found:
open(f,"w").write("".join(new_content))
return True
@dbus.service.method(DBUS_INTERFACE_NAME,
in_signature='ss',
out_signature='b',
sender_keyword='sender',
connection_keyword='conn')
def set_proxy(self, proxy_type, new_proxy, sender=None, conn=None):
"""
Set a new system-wide proxy that looks like e.g.:
http://proxy.host.net:port/
This function will set a new apt configuration and
modify /etc/environment
"""
if not authWithPolicyKit(sender, conn,
"com.ubuntu.systemservice.setproxy"):
if not authWithPolicyKit(sender, conn,
"org.gnome.gconf.defaults.set-system"):
raise PermissionDeniedError("Permission denied by policy")
# check if something supported is set
if not proxy_type in self.SUPPORTED_PROXIES:
raise UnknownProxyTypeError("proxy_type '%s' is unknown in set_proxy" % proxy_type)
# set (or reset)
if new_proxy == "" or new_proxy is None:
res = self._clear_apt_proxy(proxy_type)
res &= self._clear_etc_environment_proxy(proxy_type)
else:
res = self._write_apt_proxy(proxy_type, new_proxy)
res &= self._write_etc_environment_proxy(proxy_type, new_proxy)
return res
def _clear_etc_environment_no_proxy(self):
found=False
new_content=[]
for line in open("/etc/environment"):
if line.startswith("no_proxy="):
found = True
else:
new_content.append(line)
if found:
open("/etc/environment","w").write("".join(new_content))
return True
def _write_etc_environment_no_proxy(self, new_proxy):
if not self._verify_no_proxy(new_proxy):
return False
found=False
new_content=[]
new_proxy_line = 'no_proxy="%s"\n' % new_proxy
for line in open("/etc/environment"):
if line.startswith("no_proxy="):
line=new_proxy_line
found = True
new_content.append(line)
if found:
open("/etc/environment","w").write("".join(new_content))
else:
open("/etc/environment","a").write(new_proxy_line)
return True
@dbus.service.method(DBUS_INTERFACE_NAME,
in_signature='s',
out_signature='b',
sender_keyword='sender',
connection_keyword='conn')
def set_no_proxy(self, new_no_proxy, sender=None, conn=None):
"""
Set a new system-wide no_proxy list that looks like e.g.:
localhost,foo.com
This function will modify /etc/environment
"""
if not authWithPolicyKit(sender, conn,
"com.ubuntu.systemservice.setnoproxy"):
if not authWithPolicyKit(sender, conn,
"org.gnome.gconf.defaults.set-system"):
raise PermissionDeniedError("Permission denied by policy")
# set (or reset)
if new_no_proxy == "" or new_no_proxy is None:
res = self._clear_no_proxy()
else:
res = self._write_etc_environment_no_proxy(new_no_proxy)
return res
# keyboard stuff ---------------------------------------------------
@dbus.service.method(DBUS_INTERFACE_NAME,
in_signature='',
out_signature='ssss',
sender_keyword='sender',
connection_keyword='conn')
def get_keyboard(self, sender=None, conn=None):
"""
Set the system default keyboard configuration.
It expects four input arguments (strings):
model -- the model (evdev, pc105, ...)
layout -- the layout (de, us, ...)
variant -- the variant (nodeadkeys, ..)
options -- keyboard options (nocaps, ...)
It returns True on sucess
"""
(model, layout, variant, options) = get_keyboard_from_etc()
return (model, layout, variant, options)
@dbus.service.method(DBUS_INTERFACE_NAME,
in_signature='ssss',
out_signature='b',
sender_keyword='sender',
connection_keyword='conn')
def set_keyboard(self, model, layout, variant, options, sender=None, conn=None):
"""
Get the current keyboard configuration. This returns four
strings: (model, layout, variant, options)
"""
#print ("set_keyboard: ", model, layout, variant, options)
if not authWithPolicyKit(sender, conn,
"com.ubuntu.systemservice.setkeyboard"):
if not authWithPolicyKit(sender, conn,
"org.gnome.gconf.defaults.set-system"):
raise PermissionDeniedError("Permission denied by policy")
# apply
if not set_keyboard_to_etc(model, layout, variant, options):
print ("could not write keyboard to /etc")
return False
return True
@dbus.service.method(DBUS_INTERFACE_NAME,
in_signature='',
out_signature='b',
sender_keyword='sender',
connection_keyword='conn')
def is_reboot_required(self, sender=None, conn=None):
"""
Check if a reboot is required to finish installing
updates
"""
REBOOT_REQUIRED="/var/run/reboot-required"
# do not show reboot required if there is a transaction in
# progress as the reboot required file may be created during
# the transaction plus we don't want to show "please reboot"
# while a transaction is running
return (not self._is_package_system_locked() and
os.path.exists(REBOOT_REQUIRED))
def _is_package_system_locked(self):
# check for locks
for lock in [ self.DPKG_LOCK,
self.APT_LISTS_LOCK,
self.APT_ARCHIVES_LOCK,
self.UNATTENDED_UPGRADES_LOCK,
]:
if not os.path.exists(lock):
continue
# check for lock
flk=struct.pack('hhllhl',fcntl.F_WRLCK,0,0,0,0,0)
f=open(lock)
rv = fcntl.fcntl(f, fcntl.F_GETLK, flk)
lockv = struct.unpack('hhllhl', rv)[0]
f.close()
if lockv == fcntl.F_WRLCK:
return True
return False
@dbus.service.method(DBUS_INTERFACE_NAME,
in_signature='',
out_signature='b',
sender_keyword='sender',
connection_keyword='conn')
def is_package_system_locked(self, sender=None, conn=None):
"""
Check if the package system is locked
"""
#print ("set_keyboard: ", model, layout, variant, options)
if not authWithPolicyKit(sender, conn,
"com.ubuntu.systemservice.ispkgsystemlocked"):
raise PermissionDeniedError("Permission denied by policy")
return self._is_package_system_locked()
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