** Description changed:

+ ============ SRU justification ============
+ Impact: lxc-unshare segfaults when run with no command
+ Development fix: exit with a failure message if no command is givne.
+ Stable fix: same as development fix
+ Test case:
+       sudo lxc-unshare -s MOUNT
+       dmesg | tail
+       without the fix, the command will silently return, while dmesg
+       will show a segfault.  With the fix, lxc-unshare will warn that
+       a command is required.
+ Regression potential:
+       None.
+ 
+ ================================
+ 
  root@ubuntu:~# lxc-unshare -s NETWORK
- root@ubuntu:~# tail -1 /var/log/syslog 
+ root@ubuntu:~# tail -1 /var/log/syslog
  Jun 11 14:54:07 ubuntu kernel: [ 9386.305870] lxc-unshare[21539]: segfault at 
0 ip 00007f0fc03aea52 sp 00007fff63819f00 error 4 in 
libc-2.15.so[7f0fc02f0000+1b3000]
  
  and is not creating a new network namespace

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https://bugs.launchpad.net/bugs/1011603

Title:
  LXC-unshare network namespace segfaulting

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