xentaur

annotate xentaur.py @ 40:10444acb35f4

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author igor
date Fri Oct 12 17:31:34 2007 +0300 (2007-10-12)
parents 54b7c7ae50ec
children 8c00f233a1d4
rev   line source
igor@0 1 #!/usr/bin/python
igor@0 2
igor@0 3
igor@2 4 import sys,os,time
igor@35 5
igor@35 6 xentaur_path=os.environ['HOME']+"/xentaur"
igor@35 7
igor@0 8 sys.path.append('/etc/xen')
igor@35 9 sys.path.append(xentaur_path)
igor@11 10
igor@40 11 network='snrs_ipsec_preshared_1'
igor@40 12 domain='qua1'
igor@35 13 from xendomain import *
igor@35 14
igor@29 15 bridges_turned_down=[]
igor@29 16
igor@0 17 from IPython.Shell import IPShellEmbed
igor@0 18
igor@2 19
igor@2 20 screenrc=os.environ['HOME']+"/.screenrc_xentaur"
igor@2 21
igor@10 22 def run(program, *args):
igor@10 23 pid = os.fork()
igor@10 24 if not pid:
igor@10 25 os.execvp(program, (program,) + args)
igor@10 26 return os.wait()[0]
igor@10 27
igor@10 28 def run_command(line):
igor@10 29 #cmds=line.split()
igor@10 30 #run(cmds[0],*cmds[1:])
igor@10 31 run("/bin/sh", "-c", line)
igor@10 32
igor@23 33 def run_command_return_stdout(line):
igor@23 34 p = os.popen(line)
igor@23 35 output = p.read()
igor@23 36 p.close()
igor@23 37 return output
igor@23 38
igor@0 39 def create_bridges_script():
igor@38 40 unbound_bridges=set(bridges)-set(real_bridges)
igor@40 41 create_unbound_bridges="\n".join(map(lambda x: "sudo /usr/sbin/brctl show | awk '{print $1}' | grep -qx "+x+" || sudo /usr/sbin/brctl addbr "+x, unbound_bridges))
igor@4 42 create_unbound_bridges+="\n"+"\n".join(map(lambda x: "sudo /bin/ip link set "+x+" up", unbound_bridges))
igor@0 43
igor@0 44 print """#!/bin/sh
igor@0 45 # create unbound bridges
igor@0 46 %(create_unbound_bridges)s
igor@0 47 """ % {'create_unbound_bridges' : create_unbound_bridges}
igor@0 48
igor@0 49
igor@0 50 def create_domains_script():
igor@35 51 for domain in domains:
igor@38 52 if not domain in real_nodes:
igor@38 53 print "sudo /usr/sbin/xm create "+xentaur_path+"/xendomain.py "+" domain="+domain+" network="+network+" && sleep 1 && sudo /usr/sbin/xm sched-credit -d $(sudo /usr/sbin/xm list | grep "+domain+" | awk '{print $2}') -c 10 && sleep 1"
igor@0 54
igor@0 55 def destroy_domains_script():
igor@35 56 for domain in domains:
igor@38 57 if not domain in real_nodes:
igor@38 58 print "sudo /usr/sbin/xm shutdown "+domain
igor@0 59
igor@0 60 def create_screens_script():
igor@7 61 N=1
igor@0 62 screens=[]
igor@0 63 for domain in domains:
igor@11 64 screens.append("screen -t "+domain+" "+str(N)+" sh -c 'while true; do sudo xm console "+domain+" ; echo Retrying in 5 seconds...; sleep 5; done'")
igor@0 65 N+=1
igor@0 66 screenlist="\n".join(screens)
igor@0 67
igor@11 68 #
igor@11 69 # Previous terminal acccess commands:
igor@11 70 # ip="192.168.80."+str(200+N)
igor@11 71 # screens.append("screen -t "+domain+" "+str(N)+" sh -c 'while true; do ssh root@"+ip+" ; done'")
igor@11 72 #
igor@11 73
igor@4 74 #hardstatus string "\%{gk}\%c \%{yk}\%M\%d \%{wk}\%?\%-Lw\%?\%{bw}\%n*\%f\%t\%?(\%u)\%?\%{wk}\%?\%+Lw\%?"
igor@10 75
igor@11 76 f=open(screenrc, "w");
igor@10 77 f.write("""
igor@2 78 hardstatus on
igor@2 79 hardstatus alwayslastline
igor@2 80
igor@0 81 screen -t console 0 bash
igor@10 82 %s
igor@10 83 """ % (screenlist))
igor@10 84 f.close()
igor@0 85
igor@0 86 def graph_node(node):
igor@0 87 i=0
igor@0 88 domain_type={}
igor@0 89 for domain in domains:
igor@0 90 domain_type[domain]=domain_types[i]
igor@0 91 i+=1
nata@31 92 return node+" [label=\" "+node+"\",shapefile=\"shapes/all/"+domain_type[node]+".png\",fontcolor=black,fontsize=16]"
igor@0 93
igor@29 94 def graph_bridge(bridge):
igor@29 95 if bridge in hidden_bridges:
igor@29 96 return ""
igor@38 97 if bridge in real_bridges:
igor@38 98 return "%s [shape=none,shapefile=\"shapes/all/real_switch.png\"]" % (bridge)
igor@38 99 elif bridge in bridges_turned_down:
igor@29 100 return "%s [shape=none,shapefile=\"shapes/all/switch_turned_down.png\"]" % (bridge)
igor@29 101 else:
igor@29 102 return "%s [shape=none,shapefile=\"shapes/all/switch.png\"]" % (bridge)
igor@29 103
igor@29 104
igor@0 105 def graph():
igor@0 106 nodelist=""
igor@0 107 bridgelist=""
igor@0 108 linklist=""
igor@0 109 physicallist=""
igor@0 110 networklist=""
igor@0 111
igor@0 112 nodelist=";\n ".join(map(graph_node,nodes))
igor@0 113 if nodelist: nodelist += ";"
igor@0 114
igor@29 115 bridgelist=";\n ".join(map(graph_bridge,bridges))
igor@0 116 if bridgelist: bridgelist += ";"
igor@0 117
igor@0 118 links=[]
igor@0 119 for host, bridges_raw in vbridges_table.iteritems():
igor@0 120 i=0
igor@0 121 for this_bridge in bridges_raw:
igor@27 122 if this_bridge in hidden_bridges or not this_bridge:
igor@0 123 continue
igor@28 124 if not [ host, bridges_raw.index(this_bridge), this_bridge ] in temporary_links:
igor@28 125 links.append(host+" -- "+this_bridge+" [taillabel=\"fa"+str(bridges_raw.index(this_bridge))+"/0\"]")
igor@27 126 i+=1
igor@0 127
igor@0 128 for link in temporary_links:
igor@28 129 links.append(link[0]+" -- "+link[2]+" [taillabel=\"fa"+str(link[1])+"/0\",color=blue,len=10,w=5,weight=5]")
igor@0 130
igor@27 131 for link in broken_links:
igor@28 132 links.append(link[0]+" -- "+link[2]+" [taillabel=\"fa"+str(link[1])+"/0\",style=dashed]")
igor@27 133
igor@39 134
igor@39 135 # bridge-bridge links
igor@39 136 for host, bridges_raw in bridge_bridge_table.iteritems():
igor@39 137 i=0
igor@39 138 for this_bridge in bridges_raw:
igor@39 139 if this_bridge in hidden_bridges or not this_bridge:
igor@39 140 continue
igor@39 141 if not [ host, bridges_raw.index(this_bridge), this_bridge ] in temporary_links:
igor@39 142 links.append(host+" -- "+this_bridge)
igor@39 143 i+=1
igor@39 144
igor@39 145
igor@39 146
igor@0 147 linklist=";\n ".join(links)
igor@0 148
igor@0 149 graph_dot = {
igor@0 150 'nodelist' : nodelist,
igor@0 151 'bridgelist' : bridgelist,
igor@0 152 'linklist' : linklist,
igor@0 153 'physicallist' : physicallist,
igor@0 154 'networklist' : networklist,
igor@0 155 }
igor@0 156
igor@10 157 f = open("xenomips.dot", "w");
igor@10 158 f.write ("""
igor@0 159 graph G {
igor@0 160 edge [len=1.25];
igor@0 161 splines=true;
igor@0 162 // nodes
igor@0 163
igor@0 164 node [shape=plaintext,color=white,shapefile="shapes/cisco.bmp/router.png"];
igor@0 165 %(nodelist)s
igor@0 166
igor@0 167 // bridges
igor@0 168
igor@6 169 node [shape=none,shapefile="shapes/all/switch.png"];
igor@0 170 %(bridgelist)s
igor@0 171
igor@0 172 // physical
igor@0 173
igor@0 174 node [shape=rectangle,color=blue];
igor@0 175 %(physicallist)s
igor@0 176
igor@0 177 // networks (not bridges, not physical)
igor@0 178 node [shape=rectangle,color=green];
igor@0 179 %(networklist)s
igor@0 180
igor@0 181 // links (between nodes and bridges)
igor@0 182 %(linklist)s
igor@0 183
igor@0 184 };
igor@10 185 """ % graph_dot)
igor@10 186 f.close()
igor@10 187 run_command("neato -Tpng -o xenomips.png xenomips.dot ")
igor@40 188 run_command("neato -Tsvg -o xenomips.svg xenomips.dot ")
igor@0 189
igor@27 190 def autoredraw():
igor@27 191 graph()
igor@27 192
igor@0 193 def start_all():
igor@0 194 create_bridges_script()
igor@0 195 create_screens_script()
igor@0 196 create_domains_script()
igor@0 197 graph()
igor@0 198 print """
igor@0 199 cat <<NOTE_FOR_USER
igor@0 200 # To view virtual network map, run:
igor@0 201 gqview xenomips.png
igor@0 202 # To attach to VM consoles, run:
igor@0 203 screen -c screenrc
igor@0 204 NOTE_FOR_USER
igor@0 205 """
igor@0 206
igor@0 207 def shell():
nata@31 208 autoredraw()
igor@0 209 ipshell = IPShellEmbed()
igor@0 210 ipshell()
igor@0 211
igor@0 212 def stop_all():
igor@4 213 destroy_domains_script()
igor@0 214
igor@0 215 def show_usage():
igor@0 216 print """Usage:
igor@0 217 xentaur {start|stop|start-bridges|start-domains|stop-domains|screen|graph}
igor@0 218 """
igor@0 219
igor@33 220 def save():
igor@33 221 print "network =", xen_config_name
igor@33 222 print "domains =", domains
igor@33 223 print "domain_types =", domain_types
igor@33 224 print "bridges =", bridges
igor@33 225 print "vbridges_table =", vbridges_table
igor@33 226 print "hidden_bridges =", hidden_bridges
igor@33 227 print "broken_links =", broken_links
igor@33 228 print "temporary_links =", temporary_links
igor@33 229 print "bridges_turned_down =", bridges_turned_down
igor@33 230
igor@33 231 #-----------------------------------------------------------------------
igor@33 232 # CLASSES
igor@33 233
igor@33 234 class Bridge:
igor@33 235 def __init__ (self,name):
igor@33 236 self.name=name
igor@33 237 def up(self):
igor@33 238 bridge_up(self.name)
igor@33 239 def down(self):
igor@33 240 bridge_down(self.name)
igor@33 241 def show(self):
igor@33 242 show_bridge(self.name)
igor@33 243 def dump_start(self,filter=""):
igor@33 244 dump_start(self.name,filter)
igor@33 245
igor@33 246
igor@38 247 class Domain:
igor@38 248 def __init__ (self,name):
igor@38 249 self.name=name
igor@38 250 def start(self):
igor@38 251 return ""
igor@38 252 def stop(self):
igor@38 253 return ""
igor@38 254 def start_commandline(self):
igor@38 255 return ""
igor@38 256 def graphviz(self):
igor@38 257 return ""
igor@38 258 def get_domain_id(self):
igor@38 259 return get_domain_id(self.name)
igor@38 260
igor@23 261 #-----------------------------------------------------------------------
igor@23 262 # DOMAINS
igor@23 263
igor@23 264 def get_domain_id(domain):
igor@23 265 return run_command_return_stdout("sudo xm list | awk '{if ($1 == \"'%s'\") print $2}'" % domain).rstrip("\n")
igor@23 266
igor@22 267
igor@22 268 #-----------------------------------------------------------------------
igor@22 269 # BRIDGES and IFACES
igor@22 270
igor@22 271 def bridge_down(bridge):
igor@22 272 """
igor@22 273 Turn the bridge <bridge> down
igor@22 274 """
igor@38 275 if bridge in real_bridges:
igor@38 276 print "Bridge %s is a real bridge" % (bridge)
igor@38 277 return -1
igor@29 278 if bridge in bridges_turned_down:
igor@29 279 print "Bridge %s is turned down already" % (bridge)
igor@29 280 else:
igor@29 281 bridges_turned_down.append(bridge)
igor@29 282 run_command("sudo ip link set %s down" % bridge)
igor@29 283 autoredraw()
igor@22 284
igor@22 285 def bridge_up(bridge):
igor@22 286 """
igor@22 287 Turn the bridge <bridge> up
igor@22 288 """
igor@38 289 if bridge in real_bridges:
igor@38 290 print "Bridge %s is a real bridge" % (bridge)
igor@38 291 return -1
igor@29 292 if not (bridge in bridges_turned_down):
igor@29 293 print "Bridge %s is turned up already" % (bridge)
igor@29 294 else:
igor@29 295 bridges_turned_down.remove(bridge)
igor@29 296 run_command("sudo ip link set %s up" % bridge)
igor@29 297 autoredraw()
igor@22 298
igor@22 299 def show_bridge(bridge):
igor@22 300 """
igor@22 301 Show the state of the bridge <bridge>
igor@22 302 """
igor@38 303 if bridge in real_bridges:
igor@38 304 print "Bridge %s is a real bridge" % (bridge)
igor@38 305 return -1
igor@22 306 run_command("sudo ip link show %s" % bridge)
igor@22 307
igor@23 308
igor@23 309 def int_disconnect(domain, int_number):
igor@23 310 """
igor@23 311 Disconnect the interface with the number <int_number>
igor@23 312 of the domain <domain> from the bridge to which
igor@23 313 it is connected
igor@23 314 """
igor@23 315 dom_id=get_domain_id(domain)
igor@23 316 bridge=vbridges_table[domain][int_number]
igor@23 317 if not bridge:
igor@23 318 print "Interface %s of the %s domain is not connected" % (int_number, domain)
igor@23 319 return 1
igor@23 320 run_command("sudo brctl delif %s vif%s.%s" % (bridge, dom_id, int_number))
igor@23 321 vbridges_table[domain][int_number]=''
igor@28 322 if [ domain, int_number, bridge ] in temporary_links:
igor@28 323 temporary_links.remove([ domain, int_number, bridge ])
igor@27 324 else:
igor@28 325 broken_links.append([ domain, int_number, bridge ])
igor@27 326 autoredraw()
igor@23 327
igor@23 328 def int_connect(domain, int_number, bridge):
igor@23 329 """
igor@23 330 Connect the interface with the number <int_number>
igor@24 331 of the domain <domain> to the bridge <bridge>
igor@23 332 """
igor@38 333 if bridge in real_bridges:
igor@38 334 print "Bridge %s is a real bridge" % (bridge)
igor@38 335 return -1
igor@38 336
igor@23 337 dom_id=get_domain_id(domain)
igor@23 338 if vbridges_table[domain][int_number]:
igor@23 339 print "Interface %s of the %s domain is connected already to the %s bridge" % (int_number, domain, vbridges_table[domain][int_number])
igor@23 340 return 1
igor@23 341 run_command("sudo brctl addif %s vif%s.%s" % (bridge, dom_id, int_number))
igor@23 342 vbridges_table[domain][int_number]=bridge
igor@28 343 if [ domain, int_number, bridge ] in broken_links:
igor@28 344 broken_links.remove([ domain, int_number, bridge ])
igor@27 345 else:
igor@28 346 temporary_links.append([ domain, int_number, bridge ])
igor@27 347 autoredraw()
igor@23 348
igor@24 349 def int_reconnect(domain, int_number, bridge):
igor@24 350 """
igor@24 351 Reconnect the interface with the number <int_number>
igor@24 352 of the domain <domain> from the bridge to which
igor@24 353 it is connected to the bridge <bridge>
igor@24 354 """
igor@38 355 if bridge in real_bridges:
igor@38 356 print "Bridge %s is a real bridge" % (bridge)
igor@38 357 return -1
igor@38 358
igor@24 359 int_disconnect(domain, int_number)
igor@24 360 int_connect(domain, int_number, bridge)
igor@24 361
igor@24 362 def show_int(domain, int_number):
igor@25 363 """
igor@25 364 Show information about the interface <int_nuber>
igor@25 365 of the domain <domain>
igor@25 366 """
igor@26 367 return vbridges_table[domain][int_number]
igor@24 368
igor@28 369
igor@28 370 def dump_start(bridge, filter=""):
igor@38 371 if bridge in real_bridges:
igor@38 372 print "Bridge %s is a real bridge" % (bridge)
igor@38 373 return -1
igor@32 374 try:
igor@32 375 print "Writing dump... (press Ctrl-C to stop)"
igor@32 376 run_command("sudo tcpdump -w xentaur.dump -i %s %s > /dev/null 2>&1 " % (bridge,filter))
igor@32 377 except:
igor@32 378 print "Done.\n Dump is written to xentaur.dump"
igor@28 379 return 0
igor@28 380
igor@28 381 def dump_stop():
igor@28 382 return 0
igor@33 383
igor@33 384
igor@33 385 #-----------------------------------------------------------------------
igor@33 386 # CONFIGURATION TEMPLATES
igor@33 387
igor@33 388
igor@33 389 def configure_ip_addresses(doms=domains):
igor@40 390
igor@40 391 cisco_set_ip_on_int="""
igor@40 392 \n\n\n
igor@40 393 int fa%s/0
igor@40 394 no ip address
igor@40 395 ip address %s 255.255.255.0
igor@40 396 no shutdown
igor@40 397 exit
igor@40 398 """
igor@40 399
igor@40 400 quagga_set_ip_on_int="""
igor@40 401 int eth%s
igor@40 402 no ip address
igor@40 403 ip address %s/24
igor@40 404 no shutdown
igor@40 405 exit
igor@40 406 """
igor@40 407
igor@40 408 for dom in doms:
igor@40 409 i=domains.index(dom)+1
igor@40 410 if domain_types[domains.index(dom)] == 'quagga':
igor@40 411 command = quagga_set_ip_on_int
igor@40 412 write_to(i,"\nconf t\n")
igor@40 413 j=0
igor@40 414 for br in vbridges_table[dom]:
igor@40 415 write_to(i,command % (j, "192.168.%s.%s"%(bridges.index(br)+1,i)))
igor@40 416 j+=1
igor@40 417 write_to(i,"\nend\n")
igor@40 418 else:
igor@40 419 command = cisco_set_ip_on_int
igor@40 420 write_to(i,"\nena\nconf t\n")
igor@40 421 j=0
igor@40 422 for br in vbridges_table[dom]:
igor@40 423 write_to(i,command % (j, "192.168.%s.%s"%(bridges.index(br)+1,i)))
igor@40 424 j+=1
igor@40 425 write_to(i,"\nend\n")
igor@40 426 return 0
igor@40 427
igor@40 428 def configure_no_ip_addresses(doms=domains):
igor@40 429
igor@40 430 cisco_set_ip_on_int="""
igor@40 431 \n\n\n
igor@40 432 int fa%s/0
igor@40 433 no ip address %s 255.255.255.0
igor@40 434 exit
igor@40 435 """
igor@40 436
igor@40 437 quagga_set_ip_on_int="""
igor@40 438 int eth%s
igor@40 439 no ip address %s/24
igor@40 440 exit
igor@40 441 """
igor@40 442
igor@40 443 for dom in doms:
igor@40 444 i=domains.index(dom)+1
igor@40 445 if domain_types[domains.index(dom)] == 'quagga':
igor@40 446 command = quagga_set_ip_on_int
igor@40 447 write_to(i,"\nconf t\n")
igor@40 448 j=0
igor@40 449 for br in vbridges_table[dom]:
igor@40 450 write_to(i,command % (j, "192.168.%s.%s"%(bridges.index(br)+1,i)))
igor@40 451 j+=1
igor@40 452 write_to(i,"\nend\n")
igor@40 453 else:
igor@40 454 command = cisco_set_ip_on_int
igor@40 455 write_to(i,"\nena\nconf t\n")
igor@40 456 j=0
igor@40 457 for br in vbridges_table[dom]:
igor@40 458 write_to(i,command % (j, "192.168.%s.%s"%(bridges.index(br)+1,i)))
igor@40 459 j+=1
igor@40 460 write_to(i,"\nend\n")
igor@33 461 return 0
igor@33 462
igor@33 463 def configure_ospf(doms=domains):
igor@40 464 for dom in doms:
igor@40 465 if domain_types[domains.index(dom)] == 'quagga':
igor@40 466 write_to(dom,"\n\nconf t\nrouter ospf\nnetwork 192.168.0.0/16 area 0\nend\n")
igor@40 467 else:
igor@40 468 write_to(dom,"\n\nena\nconf t\nrouter ospf 1\nnetwork 192.168.0.0 0.0.255.255 area 0\nend\n")
igor@33 469 return 0
igor@33 470
igor@33 471 def configure_save(doms=domains):
igor@33 472 write_to(doms,"\nwr\n")
igor@33 473
igor@0 474 #-----------------------------------------------------------------------
igor@0 475
igor@0 476
igor@0 477 def add_domain(name,type):
igor@0 478 domains.append(name)
igor@0 479 domain_types.append(type)
igor@0 480
igor@0 481 def brake_link(domain,bridge):
igor@0 482 broken_links.append([domain,bridge])
igor@0 483
igor@4 484 wt_timeout=0.5
igor@8 485 def write_to(screen,string,return_to_screen=""):
igor@2 486 """
igor@2 487 write_to(screen,string):
igor@2 488
igor@8 489 Type *string* to the specified screen(s).
igor@8 490 Screen may be specified with the number *screen*,
igor@8 491 with array of numbers,
igor@8 492 with array of names.
igor@2 493
igor@2 494 """
igor@5 495 screen_numbers=[] # number of the screens to write to
igor@5 496 if type(screen) == list:
igor@5 497 screen_numbers=map(lambda x: domains.index(x)+1, screen)
igor@5 498 elif type(screen) == int:
igor@5 499 screen_numbers=[screen]
igor@5 500 else:
igor@5 501 screen_numbers=[domains.index(screen)+1]
igor@5 502
igor@5 503 for screen_number in screen_numbers:
igor@5 504 run_command("screen -X select "+str(screen_number))
igor@5 505 time.sleep(wt_timeout)
igor@5 506 for line in string.splitlines():
igor@5 507 f=open('/tmp/xentaurbuf', 'w')
igor@5 508 f.write(line+"\n")
igor@5 509 f.close()
igor@5 510 run_command("screen -X readreg p /tmp/xentaurbuf")
igor@5 511 time.sleep(wt_timeout)
igor@5 512 run_command("nohup screen -X paste p >& /dev/null")
igor@5 513 time.sleep(wt_timeout)
igor@5 514
igor@8 515 if return_to_screen != "":
igor@8 516 run_command("screen -X select %s" % (return_to_screen))
igor@8 517 time.sleep(wt_timeout)
igor@0 518
igor@0 519 #-----------------------------------------------------------------------
igor@0 520
igor@5 521 cisco_fa01_up="""
igor@5 522 ena
igor@5 523 conf t
igor@5 524 int fa0/0
igor@5 525 no shutdown
igor@5 526 exit
igor@5 527 int fa1/0
igor@5 528 no shutdown
igor@5 529 exit
igor@5 530 exit
igor@5 531 exit
igor@5 532 """
igor@5 533
igor@5 534 cisco_set_ip_on_int="""
igor@5 535 interface fa%s/0
igor@5 536 no ip address
igor@5 537 ip address %s 255.255.255.0
igor@5 538 exit
igor@5 539 """
igor@5 540
igor@33 541
igor@0 542
igor@0 543 nodes=domains
igor@0 544
igor@0 545 if len(sys.argv) > 1:
igor@0 546 if sys.argv[1] == 'start':
igor@0 547 start_all()
igor@0 548 if sys.argv[1] == 'stop':
igor@0 549 stop_all()
igor@0 550 if sys.argv[1] == 'start-bridges':
igor@3 551 create_bridges_script()
igor@0 552 if sys.argv[1] == 'start-domains':
igor@3 553 create_domains_script()
igor@0 554 if sys.argv[1] == 'stop-domains':
igor@3 555 destroy_domains_script()
igor@0 556 elif sys.argv[1] == 'screen':
igor@3 557 create_screens_script()
igor@0 558 elif sys.argv[1] == 'graph':
igor@0 559 graph()
igor@0 560 elif sys.argv[1] == 'shell':
igor@0 561 shell()
igor@0 562
igor@0 563 else:
igor@0 564 show_usage()
igor@0 565 sys.exit(1)
igor@0 566
igor@0 567 sys.exit(0)
igor@0 568
igor@0 569