[Bug 1444968] [NEW] Postfix init.d scripts malfunction in an unprivilleged Docker container

[Ernestas]

Public bug reported:

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.

** Affects: postfix (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1444968

Title:
  Postfix init.d scripts malfunction in an unprivilleged Docker
  container

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