Commits on Sep 27, 2019

1. WIP: compose: Add experimental/sysusers option …

   First, we add support for a new `experimental:` key.  Then
   there's a new `sysusers` key underneath that.
   
   When enabled, we drop all of the other previous passwd handling.
   In practice the only one that was used was having static files.
   That is a pain to maintain.
   
   However, we need to statically assign non-zero uid/gid for any
   files that come from a base ostree commit.  Anything else
   would mean the user/groups could be unpredictably assigned in different
   rpm-ostree runs.
   
   This code now checks for an errors out on that.
   
   In order to convert *fully* to sysusers, we install an interceptor for
   `useradd/groupadd` that talk back via a pipe to the compose process.
   These invocations then get translated to drop into a new`
   `sysusers.d/rpmostree-auto.conf` file.
   
   This way we don't need to require that every RPM have ported to
   sysusers.d.
   
   At the end, we drop everything in `/etc/passwd` and `/etc/group`
   except for the `root:` entries, relying on `systemd-sysusers` to
   readd everything at boot time.
   
   Closes: coreos#49

   

   cgwalters committed Sep 27, 2019
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