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[Bryce Harrington <1918209@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

apache2ctl detects if systemd is in use by looking at the owner of
/proc/1/exe.

Under docker, however, this cannot be relied on and may simply be the
command being run:

  $ docker run --rm --name "apache2-test" 26ff08910bcd ls -l /proc/1/exe
  lrwxrwxrwx 1 root root 0 Feb 23 22:07 /proc/1/exe -> /usr/bin/ls

This is seen as causing OCI build failures, with an error such as:

...
Enabling site 000-default.
update-rc.d: error: no runlevel symlinks to modify, aborting!
dpkg: error processing package apache2 (--configure):
 installed apache2 package post-installation script subprocess returned error exit status 1
Processing triggers for libc-bin (2.33-0ubuntu2) ...
Errors were encountered while processing:
 apache2
...

[Proposed Fix]
Another way to look for systemd is  [ -d /run/systemd/system ], which may be worth having as a fallback to check if /proc/1 is not systemd.

** Affects: apache2 (Ubuntu)
     Importance: High
     Assignee: Bryce Harrington (bryce)
         Status: In Progress

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https://bugs.launchpad.net/bugs/1918209

Title:
  Detection of systemd breaks building in docker

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