[Bug 1011603] Re: LXC-unshare network namespace segfaulting

[Serge Hallyn]

** 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 at ubuntu:~# lxc-unshare -s NETWORK
- root at ubuntu:~# tail -1 /var/log/syslog 
+ root at 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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