The rootfs image can't be used as base image

[mikma]

The Rootfs image can't be used as base image since any attempt to RUN commands fails with:

0.323 runc run failed: unable to start container process: error during container init: error mounting "/var/lib/docker/buildkit/executor/resolv.conf" to rootfs at "/etc/resolv.conf": create mountpoint for /etc/resolv.conf mount: make mountpoint "/etc/resolv.conf": file exists

Test case:

$ cat Dockerfile

FROM openwrt/rootfs

RUN mkdir /root/test

CMD [ "/sbin/init" ]

Test run:

$ docker build .

 > [2/2] RUN mkdir /root/test:                                                                                                                                                                
0.135 runc run failed: unable to start container process: error during container init: error mounting "/var/lib/docker/buildkit/executor/resolv.conf" to rootfs at "/etc/resolv.conf": create mountpoint for /etc/resolv.conf mount: make mountpoint "/etc/resolv.conf": file exists
------
Dockerfile:3
--------------------
   1 |     FROM openwrt/rootfs
   2 |     
   3 | >>> RUN mkdir /root/test
   4 |     
   5 |     CMD [ "/sbin/init" ]
--------------------
ERROR: failed to solve: process "/bin/sh -c mkdir /root/test" did not complete successfully: exit code: 1

Proposed solution: Don't include /etc/resolv.conf in the rootfs image. The file seems unnecessary since Docker mounts it's own version of the file anyway.