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docs/devel/testing: Add -a option to usermod command on docker setup 

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>
This commit is contained in:
Murilo Opsfelder Araujo 2019-02-07 16:43:46 -02:00 committed by Alex Bennée
parent 2d4e4c01b1
commit 29c33cc107
1 changed files with 1 additions and 1 deletions
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docs/devel/testing.rst
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@ -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