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Description of problem:
When NetworkManager service is stopped, nmcli hangs in multiple situations after raising an exception to stdout.

Such a hang is very unpleasant for tools or scripts running nmcli command and expecting (prompt) output.


Version-Release number of selected component (if applicable):
NetworkManager-0.8.1-66.el6.x86_64


How reproducible:
100%


Steps to Reproduce:
1. service NetworkManager stop
2. nmcli con status
3. nmcli con show
4. nmcli con --help
5. nmcli con whateverWrong


Actual results:
commands 2. to 5. hung after raising:

** (process:18982): WARNING **: get_all_cb: couldn't retrieve system settings properties: (2) The name org.freedesktop.NetworkManagerSystemSettings was not provided by any .service files.

** (process:18982): WARNING **: fetch_connections_done: error fetching system connections: (2) The name org.freedesktop.NetworkManagerSystemSettings was not provided by any .service files.


Expected results:
Commands should not hung.


Additional info:

nmcli only hangs when neither NetworkManager nor nm-applet is running. NetworkManager 0.8 (in RHEL 6) has two setting services supplying connections: one is NetworkManager itself handling system connections, and the other is a user service handling user connections - usually nm-applet. From NetworkManager 0.9 upwards all connections are managed by NetworkManager itself.

Also note that nmcli commands in RHEL6 differ from RHEL7. For example:
List all connections:
nmcli con [show]                - RHEL7
nmcli con list [user | system]  - RHEL6

Active connections:
nmcli con show -a               - RHEL7
nmcli con status                - RHEL6 

But, of course, the nmcli freeze is a bug and I will post a patch to fix it.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-1257.html