Add "procps" back for "rabbitmqctl wait"

[tianon]

Thanks @bfink13!

(This is a redo of #163, fixing #162, as pointed out in #297 (comment))

[bfink13]

Thanks for the super fast turnaround! Is the push to docker hub done automatically or manually on a schedule or what?

[tianon]

https://github.com/docker-library/rabbitmq#see-a-change-merged-here-that-doesnt-show-up-on-docker-hub-yet 😉

[gerhard]

rabbitmqctl wait relies on ps -p

In Ubuntu, this command works out of the box:

docker run --rm ubuntu:18.04 ps -p 1
  PID TTY          TIME CMD
    1 ?        00:00:00 ps

In Alpine, it doesn't:

docker run --rm alpine:3.8 ps -p 1
ps: unrecognized option: p
BusyBox v1.28.4 (2018-12-31 18:05:13 UTC) multi-call binary.

Usage: ps [-o COL1,COL2=HEADER]

Show list of processes

	-o COL1,COL2=HEADER	Select columns for display

Alpine with procps installed:

docker run --rm alpine:3.8 sh -c "apk add procps && ps -p 1"
fetch http://dl-cdn.alpinelinux.org/alpine/v3.8/main/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.8/community/x86_64/APKINDEX.tar.gz
(1/6) Installing libintl (0.19.8.1-r2)
(2/6) Installing ncurses-terminfo-base (6.1_p20180818-r1)
(3/6) Installing ncurses-terminfo (6.1_p20180818-r1)
(4/6) Installing ncurses-libs (6.1_p20180818-r1)
(5/6) Installing libproc (3.3.15-r0)
(6/6) Installing procps (3.3.15-r0)
Executing busybox-1.28.4-r3.trigger
OK: 12 MiB in 19 packages
  PID TTY          TIME CMD
    1 ?        00:00:00 ps

I propose we revert ff74887 and add procps to Alpine only.

[tianon]

Doh, sounds good!