1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
|
#!/usr/bin/python
# coding: utf-8
#
# pkgdistcache client v0.3.1
# by Alessio Bianchi <venator85@gmail.com>
#
import sys
import os
import os.path
import subprocess
import string
import avahi
import dbus
from gi.repository import GObject as gobject
import dbus.glib
import pickle
colors = {'none': '\033[0m',
'black': '\033[0;30m', 'bold_black': '\033[1;30m',
'red': '\033[0;31m', 'bold_red': '\033[1;31m',
'green': '\033[0;32m', 'bold_green': '\033[1;32m',
'yellow': '\033[0;33m', 'bold_yellow': '\033[1;33m',
'blue': '\033[0;34m', 'bold_blue': '\033[1;34m',
'magenta': '\033[0;35m', 'bold_magenta': '\033[1;35m',
'cyan': '\033[0;36m', 'bold_cyan': '\033[1;36m',
'white': '\033[0;37m', 'bold_white': '\033[1;37m'}
def printmsg(msg):
print("%s>> %s%s" % (colors['bold_blue'], msg, colors['none']))
def printerr(msg):
print("%s!! %s%s" % (colors['bold_red'], msg, colors['none']))
def printwarn(msg):
print("%s!! %s%s" % (colors['bold_yellow'], msg, colors['none']))
# Run a command synchronously, redirecting stdout and stderr to strings
def runcmd(cmd, cwd=None):
pipe = subprocess.Popen(cmd, shell=True, cwd=cwd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
(stdout, stderr) = pipe.communicate() # wait for process to terminate and return stdout and stderr
return {'stdout': stdout.strip(), 'stderr': stderr.strip(), 'retcode': pipe.returncode}
# Run a command synchronously, sending stdout and stderr to shell
def runcmd2(cmd, cwd=None):
pipe = subprocess.Popen(cmd, shell=True, cwd=cwd, stdout=None, stderr=None)
pipe.communicate() # wait for process to terminate
return pipe.returncode
class Service(object):
def __init__(self, service, host, ip, port):
self.service = service
self.host = host
self.ip = ip
self.port = port
def __str__(self):
return "(%s, %s, %s, %d)" % (self.service, self.host, self.ip, self.port)
def __repr__(self):
# il tostring sulle liste รจ repr
return self.__str__()
def __hash__(self):
return hash(self.__str__())
def __eq__(self, other):
return hash(self) == hash(other)
class AvahiBrowser(object):
def __init__(self):
# Connect to the system bus...
self.bus = dbus.SystemBus()
# Get a proxy to the object we want to talk to.
avahi_proxy = self.bus.get_object(avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER)
# Set the interface we want to use; server in this case.
self.server = dbus.Interface(avahi_proxy, avahi.DBUS_INTERFACE_SERVER)
self.version_string = self.server.GetVersionString()
self.domain = "local"
self.loop = gobject.MainLoop()
self.services = []
def browse(self, stype):
# Ask the server for a path to the browser object for the service we're interested in...
browser_path = self.server.ServiceBrowserNew(avahi.IF_UNSPEC, avahi.PROTO_UNSPEC, stype, self.domain, dbus.UInt32(0))
# Get it's proxy object...
browser_proxy = self.bus.get_object(avahi.DBUS_NAME, browser_path)
# And set the interface we want to use
browser = dbus.Interface(browser_proxy, avahi.DBUS_INTERFACE_SERVICE_BROWSER)
# Now connect the call backs to the relevant signals.
browser.connect_to_signal('ItemNew', self.new_service)
browser.connect_to_signal('AllForNow', self.all_for_now)
self.loop.run()
return self.services
def new_service(self, interface, protocol, name, stype, domain, flags):
try:
s = self.server.ResolveService(interface, protocol, name, stype, domain, avahi.PROTO_UNSPEC, dbus.UInt32(0))
service = Service(str(s[3]), str(s[2]), str(s[7]), int(s[8])) # service name, host, ip, port
self.services.append(service)
except TimeoutError:
printwarn("Timeout error during service resolution!")
def all_for_now(self):
self.loop.quit()
def main(argv):
# load configuration file
conf_file = '/etc/pkgdistcache.conf'
if os.path.isfile(conf_file):
config = eval(open(conf_file).read())
else:
printerr("Config file " + conf_file + " not found")
return 2
download_cmd_template = string.Template(config['download_cmd'])
pkg = os.path.basename(argv[1]) # argv[1] = %u passed by pacman
must_download = True
if not pkg.endswith('.db.tar.gz'):
# find first /tmp/pkgdistcache.* file modified less than CACHE_FILE_LIFE minutes ago
cmd = 'find /tmp -name "pkgdistcache.*" -mmin -' + str(config['cache_file_life'])
cache_file = runcmd(cmd)['stdout']
if len(cache_file) > 0:
# recent cache file found, use it
with open(cache_file, 'rb') as f:
pkgdistcache_clients = pickle.load(f)
else:
# recent cache file not found, discover other pkgdistcache capable hosts via avahi and save result to a new cache file
runcmd("rm -f /tmp/pkgdistcache.*") # remove any old cache file
cache_file = runcmd('mktemp /tmp/pkgdistcache.XXXXX')['stdout'] # create new cache file
hostname = runcmd('hostname')['stdout']
browser = AvahiBrowser()
clients = browser.browse("_pkgdistcache._tcp")
clients = set(clients) # remove duplicates (eg services offered on more than a network card etc.)
pkgdistcache_clients = []
for client in clients:
if client.host != hostname: # exclude current machine from results
pkgdistcache_clients.append(client)
with open(cache_file, 'wb') as f:
pickle.dump(pkgdistcache_clients, f, -1)
for client in pkgdistcache_clients:
clientip = client.ip
if ":" in clientip:
clientip = "[" + clientip + "]"
url = "http://" + clientip + ":" + str(client.port) + "/" + pkg
dst = argv[2]
printmsg("Downloading " + pkg + " from host '" + client.host + "'")
download_cmd = download_cmd_template.substitute({'u': url, 'o': dst})
try:
ret = runcmd2(download_cmd)
if ret == 0:
must_download = False
break
else:
printwarn("Host '%s' doesn't have %s in cache" % (client.host, pkg))
except KeyboardInterrupt:
printerr("Aborted")
return 1
# download package file from mirror if necessary
if must_download == True:
try:
download_cmd = download_cmd_template.substitute({'u': argv[1], 'o': argv[2]})
return runcmd2(download_cmd)
except KeyboardInterrupt:
printerr("Aborted")
return 1
else:
return 0
if __name__ == '__main__':
sys.exit(main(sys.argv))
|