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From: Patrick Hess <patrickhess@gmx.net>
To: Matthias Apitz <guru@unixarea.de>, freebsd-questions@freebsd.org
Subject: Re: pkg installation && adduser
Date: Tue, 04 Aug 2015 20:42:25 +0200
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Matthias Apitz wrote:
> I'm trying to understand how the package command creates users during
> the installation of packages, for example the dbus-1.8.8.txz does not
> contain any file or script for creating the groups and user
> 'messagebus'. How this is done during 'pkg install dbus'.
> 
> [...]
>
> # tar tzf work/pkg/dbus-1.8.8.txz | fgrep +
> +COMPACT_MANIFEST
> +MANIFEST

Take a look at the contents of that +MANIFEST file (linebreaks added
here for better readability):

    # tar xvf dbus-1.8.20.txz
    x +COMPACT_MANIFEST
    x +MANIFEST
    [...]

    # cat +MANIFEST
    [...]
    "scripts":
      {"pre-install":
         "echo \"===> Creating users and/or groups.\"
         if ! /usr/sbin/pw groupshow messagebus >/dev/null 2>&1; then
            echo \"Creating group 'messagebus' with gid '556'.\" 
            /usr/sbin/pw groupadd messagebus -g 556
    [...]

Patrick