[Qemu-devel] [PULL 17/18] docs/devel/testing: Add -a option to usermod command on docker setup

["Alex Bennée" <alex.bennee@linaro.org>]

From: Murilo Opsfelder Araujo <muriloo@linux.ibm.com>

The option -G of usermod command will remove user from other groups
not listed, i.e.: $USER will belong only to group 'docker' after
following the documentation as is.

>From usermod(8) manual page:

    If the user is currently a member of a group which is not listed,
    the user will be removed from the group. This behaviour can be
    changed via the -a option, which appends the user to the current
    supplementary group list.

This patch improves the situation by adding the -a option to the
usermod command, which will just append user to the supplementary
group list.

Cc: qemu-trivial@nongnu.org
Signed-off-by: Murilo Opsfelder Araujo <muriloo@linux.ibm.com>
Message-Id: <20190207184346.6840-1-muriloo@linux.ibm.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>

diff --git a/docs/devel/testing.rst b/docs/devel/testing.rst
index 18e2c0868a..135743a2bf 100644
--- a/docs/devel/testing.rst
+++ b/docs/devel/testing.rst
@@ -301,7 +301,7 @@ An alternative method to set up permissions is by adding the current user to
 .. code::
 
   $ sudo groupadd docker
-  $ sudo usermod $USER -G docker
+  $ sudo usermod $USER -a -G docker
   $ sudo chown :docker /var/run/docker.sock
 
 Note that any one of above configurations makes it possible for the user to
-- 
2.20.1