X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=slicesu;h=dcbe850d7b2a6b59aad4d404d3d5a91641b6f918;hb=3d59d52c4a2b3247b2fe8498c79cd4d51829df69;hp=15e585405e27cf6cd95fc2c57d5844984c982542;hpb=958a51c139fd55a18d8ba07923801fdffcd91cbf;p=lxc-userspace.git diff --git a/slicesu b/slicesu old mode 100644 new mode 100755 index 15e5854..dcbe850 --- a/slicesu +++ b/slicesu @@ -1,9 +1,10 @@ -#!/usr/bin/python +#!/usr/bin/python3 import sys import os import setns import pdb +import re from argparse import ArgumentParser @@ -25,36 +26,60 @@ def getarch(f): def get_cgroup_subdirs_for_pid(pid): cgroup_info_file = '/proc/%s/cgroup'%pid cgroup_lines = open(cgroup_info_file).read().splitlines() - + subdirs = {} for line in cgroup_lines: try: _, cgroup_name, subdir = line.split(':') subdirs[cgroup_name] = subdir - except Exception, e: - print "Error reading cgroup info: %s"%str(e) + except Exception as e: + print("Error reading cgroup info: %s"%str(e)) pass - + return subdirs - - + + def umount(fs_dir, opts=''): output = os.popen('/bin/umount %s %s 2>&1'%(opts, fs_dir)).read() return ('device is busy' not in output) def kvmsu(slice_name, args): - # Find MAC address of virt interface - ifstr = os.popen('/usr/bin/virsh domiflist %s'%slice_name).read().strip() - mac_address = ifstr.split()[-1] - - # Find IP address of virt interface - ipaddr_str = os.popen('arp -an | grep %s'%'78:2b:cb:2d:f0:60').read().strip() - ip_addr_part = ipaddr_str.split()[1] - if (ip_addr_part[0]=='(' and ip_addr_part[-1]==')'): - ip_addr = ip_addr_part[1:len(ip_addr_part)-1] - - os.execv('/usr/bin/ssh',['/usr/bin/ssh','-o','StrictHostKeyChecking=no','root@%s'%ip_addr,'"$@"']) - + mac_addresses = [] + + # Find MAC addresses of virt interfaces + p = os.popen("virsh domiflist %s"%slice_name) + for line in p: + m = re.search(r'([0-9A-F]{2}[:-]){5}([0-9A-F]{2})', line, re.I) + if m: + mac_addresses.append(m.group()) + + # Find IP address of a reachable virt interface + # Here we're taking the one attached to br-nat, but this is specific to OpenCloud + ip_addr = None + try: + f = open('/var/lib/dnsmasq/br-nat.hosts', 'r') + for line in f: + for mac in mac_addresses: + m = re.search("^%s,[0-9.]+$"%mac, line, re.I) + if m: + ip_addr = m.group().split(',')[1] + break + f.close() + except: + pass + + if ip_addr: + # Need to login to a Ubuntu Cloud image as 'ubuntu' user + # Not sure how to make this more general + os.execv('/usr/bin/ssh', + ['/usr/bin/ssh','-o','StrictHostKeyChecking=no','ubuntu@%s'%ip_addr] + + args.command_to_run) + else: + # What should happen here? + print("Cannot map instance to IP address") + exit(1) + + def lxcsu(slice_name, args): # plain lxcsu @@ -81,14 +106,14 @@ def lxcsu(slice_name, args): # they chould be changed as well except: - print "Domain %s not found"%slice_name + print("Domain %s not found"%slice_name) exit(1) if not driver_pid or not init_pid: - print "Domain %s not started"%slice_name + print("Domain %s not started"%slice_name) exit(1) - if debug: print "Found driver_pid",driver_pid,'and init_pid=',init_pid + if debug: print("Found driver_pid",driver_pid,'and init_pid=',init_pid) # xxx probably init_pid here too arch = getarch('/proc/%s/exe'%driver_pid) @@ -106,7 +131,7 @@ def lxcsu(slice_name, args): sysctls.append((sysctl_file, sysctl_name, sysctl_val)) # xxx probably init_pid here too - subdirs = get_cgroup_subdirs_for_pid(driver_pid) + subdirs = get_cgroup_subdirs_for_pid(driver_pid) sysfs_root = '/sys/fs/cgroup' # If the slice is frozen, then we'll get an EBUSY when trying to write to the task @@ -127,12 +152,12 @@ def lxcsu(slice_name, args): subsystem_comps.reverse() subsystem_alt = ','.join(subsystem_comps) tasks_path_alt = [sysfs_root, subsystem_alt, subdirs[subsystem], 'tasks'] - except Exception,e: + except Exception as e: pass - + tasks_path = [sysfs_root,subsystem,subdirs[subsystem],'tasks'] tasks_path_str = '/'.join(tasks_path) - + try: f = open(tasks_path_str, 'w') except: @@ -143,19 +168,19 @@ def lxcsu(slice_name, args): if (subsystem=='freezer'): f.close() - except Exception,e: - if (not subdirs.has_key(subsystem)): + except Exception as e: + if (subsystem not in subdirs): pass else: - if debug: print e - print "Error assigning cgroup %s (pid=%s) for slice %s"%(current_cgroup,driver_pid, slice_name) + if debug: print(e) + print("Error assigning cgroup %s (pid=%s) for slice %s"%(current_cgroup,driver_pid, slice_name)) exit(1) def chcontext (path): retcod = setns.chcontext (path) if retcod != 0: - print 'WARNING - setns(%s)=>%s (ignored)'%(path,retcod) + print('WARNING - setns(%s)=>%s (ignored)'%(path,retcod)) return retcod # Use init_pid and not driver_pid to locate reference namespaces @@ -163,7 +188,7 @@ def lxcsu(slice_name, args): if True: chcontext(ref_ns+'uts') if True: chcontext(ref_ns+'ipc') - + if (not args.no_pidns): chcontext(ref_ns+'pid') if (not args.no_netns): chcontext(ref_ns+'net') if (not args.no_mntns): chcontext(ref_ns+'mnt') @@ -179,7 +204,7 @@ def lxcsu(slice_name, args): os.system('%s -w %s=%s >/dev/null 2>&1'%(fn, sysctl_name,sysctl_val)) break else: - print "Error: image does not have a sysctl binary" + print("Error: image does not have a sysctl binary") # cgroups is not yet LXC-safe, so we need to use the coarse grained access control # strategy of unmounting the filesystem @@ -188,14 +213,14 @@ def lxcsu(slice_name, args): for subsystem in ['cpuset','cpu,cpuacct','memory','devices','freezer','net_cls','blkio','perf_event','systemd']: fs_path = '/sys/fs/cgroup/%s'%subsystem if (not umount(fs_path,'-l')): - print 'WARNING - umount failed (ignored) with path=',fs_path + print('WARNING - umount failed (ignored) with path=',fs_path) pass # Leaving these comments for historical reference #print "Error disabling cgroup access" #exit(1) - Don't need this because failure here implies failure in the call to umount /sys/fs/cgroup if (not umount('/sys/fs/cgroup')): - print "Error disabling cgroup access" + print("Error disabling cgroup access") exit(1) fork_pid = os.fork() @@ -209,7 +234,7 @@ def lxcsu(slice_name, args): if (fork_pid == 0): if (not args.root): - setns.drop_caps() + setns.drop_caps() if (args.nosliceuid): # we still want to drop capabilities, but don't want to switch UIDs exec_args = [arch,'/bin/sh','--login',]+args.command_to_run @@ -218,7 +243,7 @@ def lxcsu(slice_name, args): # as a way of checking the existence of the slice account uid = getuid (slice_name) if not uid: - print "lxcsu could not spot %s in /etc/passwd - exiting"%slice_name + print("lxcsu could not spot %s in /etc/passwd - exiting"%slice_name) exit(1) exec_args = [arch,'/usr/bin/sudo','-u',slice_name,'/bin/sh','--login',]+args.command_to_run # once we can drop f12, it would be nicer to instead go for @@ -232,7 +257,7 @@ def lxcsu(slice_name, args): if not args.noslicehome: os.environ['HOME'] = '/home/%s'%slice_name os.chdir("/home/%s"%(slice_name)) - if debug: print 'lxcsu:execv:','/usr/bin/setarch',exec_args + if debug: print('lxcsu:execv:','/usr/bin/setarch',exec_args) os.execv('/usr/bin/setarch',exec_args) else: setns.proc_umount() @@ -297,7 +322,7 @@ def main (): ostype = pair[1].strip() break except: - print "Domain %s not found"%slice_name + print("Domain %s not found"%slice_name) is_kvm = ostype=='hvm'