Public bug reported:

[Impact]

Currently, the official Ubuntu docker images are based on the core rootfs 
tarballs from https://partner-images.canonical.com/core/ .
We want to switch to the newly created OCI tarballs from 
(https://partner-images.canonical.com/oci). See also LP:#1926732 for details 
about the OCI rootfs tarballs.

While trying to switch the official ubuntu docker images on dockerhub to
the newly created OCI rootfs tarballs, it poped up that for the bionic
containers, there are device node entries in the rootfs (/dev files).

The diff (see https://github.com/docker-library/official-
images/pull/10287) looks like:

--- a/ubuntu_bionic/ubuntu-bionic-core-cloudimg-amd64-root.tar.gz  'tar -t'     
+++ b/ubuntu_bionic/ubuntu-bionic-oci-amd64-root.tar.gz  'tar -t'       
@@ -86,6 +86,19 @@ bin/zmore
 bin/znew
 boot/
 dev/
+dev/fd
+dev/full
+dev/null
+dev/ptmx
+dev/pts/
+dev/random
+dev/shm/
+dev/stderr
+dev/stdin
+dev/stdout
+dev/tty
+dev/urandom
+dev/zero


This causes problems (see 
https://github.com/tianon/docker-brew-ubuntu-core/issues/62 ) and would be a 
regression when switching from the core rootfs tarballs to the oci rootfs 
tarball.

Expected is that there are not /dev files in the rootfs tarball.

[Test Plan]

1) build ubuntu-oci project with launchpad
2) do some basic tests with the rootfs tarball:
cat << EOF > Dockerfile
FROM scratch
ADD hirsute-minimal-cloudimg-amd64-root.tar.gz /
CMD ["/bin/bash"]
EOF
$ docker build .
docker run -it $image-id uname -a
3) check the tarball size (should not change significantly)
4) check that there are not /dev files in the tarball


[Where problems could occur]
This change could break other livecd-rootfs projects which might lead to failed 
builds. But beside that, there is nothing I can think of that would be affected 
by this change. And it's very unlikely to break other livecd-rootfs builds.

[Other Info]
None

** Affects: livecd-rootfs (Ubuntu)
     Importance: Undecided
     Assignee: Thomas Bechtold (toabctl)
         Status: In Progress

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https://bugs.launchpad.net/bugs/1930686

Title:
  Do not include /dev device node filles in OCI rootfs tarballs

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