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Description of problem:

I upgraded the package dokku yesterday, on a Debian system. After the upgrade, the users I had added in "dokku" group were removed.

Output of the following commands

Dokku report:

-----> uname: Linux btl-dev01 4.9.0-3-amd64 #1 SMP Debian 4.9.30-2+deb9u3 (2017-08-06) x86_64 GNU/Linux
-----> memory:
total used free shared buff/cache available
Mem: 3955 614 944 101 2396 2956
Swap: 1023 0 1023
-----> docker version:
Client:
Version: 17.05.0-ce
API version: 1.29
Go version: go1.7.5
Git commit: 89658be
Built: Thu May 4 22:09:06 2017
OS/Arch: linux/amd64

Server:
Version: 17.05.0-ce
API version: 1.29 (minimum version 1.12)
Go version: go1.7.5
Git commit: 89658be
Built: Thu May 4 22:09:06 2017
OS/Arch: linux/amd64
Experimental: false
-----> docker daemon info:
Containers: 5
Running: 3
Paused: 0
Stopped: 2
Images: 38
Server Version: 17.05.0-ce
Storage Driver: overlay2
Backing Filesystem: xfs
Supports d_type: true
Native Overlay Diff: true
Logging Driver: json-file
Cgroup Driver: cgroupfs
Plugins:
Volume: local
Network: bridge host macvlan null overlay
Swarm: inactive
Runtimes: runc
Default Runtime: runc
Init Binary: docker-init
containerd version: 9048e5e50717ea4497b757314bad98ea3763c145
runc version: 9c2d8d184e5da67c95d601382adf14862e4f2228
init version: 949e6fa
Security Options:
seccomp
Profile: default
Kernel Version: 4.9.0-3-amd64
Operating System: Debian GNU/Linux 9 (stretch)
OSType: linux
Architecture: x86_64
CPUs: 2
Total Memory: 3.863GiB
Name: btl-dev01
ID: M4DL:WXYP:OUYG:XLU4:YOII:RHYB:TFSH:JFSH:YAMY:NJE4:OOWX:NPGJ
Docker Root Dir: /var/lib/docker
Debug Mode (client): true
Debug Mode (server): false
Registry: https://index.docker.io/v1/
Experimental: false
Insecure Registries:
127.0.0.0/8
Live Restore Enabled: false

WARNING: No swap limit support
-----> sigil version: 0.4.0
-----> herokuish version:
herokuish: 0.3.32
buildpacks:
heroku-buildpack-multi v1.0.0
heroku-buildpack-ruby v168
heroku-buildpack-nodejs v99
heroku-buildpack-clojure v77
heroku-buildpack-python v99
heroku-buildpack-java v53
heroku-buildpack-gradle v23
heroku-buildpack-scala v78
heroku-buildpack-play v26
heroku-buildpack-php v122
heroku-buildpack-go v72
heroku-buildpack-erlang fa17af9
buildpack-nginx v8
-----> dokku version: 0.10.4
-----> dokku plugins:
plugn: 0.3.0
00_dokku-standard 0.10.4 enabled dokku core standard plugin
20_events 0.10.4 enabled dokku core events logging plugin
apps 0.10.4 enabled dokku core apps plugin
build-env 0.10.4 enabled dokku core build-env plugin
certs 0.10.4 enabled dokku core certificate management plugin
checks 0.10.4 enabled dokku core checks plugin
common 0.10.4 enabled dokku core common plugin
config 0.10.4 enabled dokku core config plugin
docker-options 0.10.4 enabled dokku core docker-options plugin
domains 0.10.4 enabled dokku core domains plugin
enter 0.10.4 enabled dokku core enter plugin
git 0.10.4 enabled dokku core git plugin
logs 0.10.4 enabled dokku core logs plugin
named-containers 0.10.4 enabled dokku core named containers plugin
nginx-vhosts 0.10.4 enabled dokku core nginx-vhosts plugin
plugin 0.10.4 enabled dokku core plugin plugin
postgres 1.0.0 enabled dokku postgres service plugin
proxy 0.10.4 enabled dokku core proxy plugin
ps 0.10.4 enabled dokku core ps plugin
repo 0.10.4 enabled dokku core repo plugin
shell 0.10.4 enabled dokku core shell plugin
ssh-keys 0.10.4 enabled dokku core ssh-keys plugin
storage 0.10.4 enabled dokku core storage plugin
tags 0.10.4 enabled dokku core tags plugin
tar 0.10.4 enabled dokku core tar plugin

How was Dokku installed?:

Using Debian package repository:

deb https://packagecloud.io/dokku/dokku/ubuntu/ trusty main

How reproducible:

I only have one server with dokku.

Steps to Reproduce:

1. aptitude upgrade

Actual Results:

Dokku group is empty:

# getent group dokku
dokku:x:1006:

And the following lines were found in /var/log/auth.log:

Sep 21 23:04:57 btl-dev01 gpasswd[18990]: user dokku added by root to group adm
Sep 21 23:04:57 btl-dev01 gpasswd[18995]: members of group dokku set by root to

Expected Results:

Dokku group contains previously added users:

# getent group dokku
dokku:x:1006:removedforprivacy

Additional info:

Adding user in dokku group is documented and upgrade should care about it:
https://github.com/dokku/dokku/blob/master/docs/deployment/user-management.md#granting-other-unix-user-accounts-dokku-access