Postfix init.d scripts malfunction in an unprivilleged Docker container

[Ernestas]

It would be beneficial to change 52 line in /etc/init.d/postfix from:
        dir=$(ls -l /proc/$pid/exe 2>/dev/null | sed 's/.* -> //; s/\/[^\/]*$//')
to:
        dir=$(cat /proc/$pid/task/$pid/cmdline 2>/dev/null)

First, it's obviously shorter. Second, it would work in Docker. It does require additional kernel capabilities for looking into /proc/$pid/exe. By default, Docker (and I presume that the same situation is with LXC containers as well) does not give permission to /proc/$pid/exe, but does provide access to contents of cmdline.

[Scott Kitterman (kitterman)]

This was fixed in 3.4.7-2.