[Bug 1235169] Re: Fails to read files in /etc/network/interfaces.d/

[TJ]

My proposed patch concats the dir name and filename before calling
read_interfaces_defn() as a result of a "source-dir" directive. It adds
additional messages when "--verbose" is set to aid in assuring the
correct path is being used.

** Patch added: "Proposed fix to config.c"
   https://bugs.launchpad.net/ubuntu/+source/ifupdown/+bug/1235169/+attachment/3859364/+files/bugfix.patch

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Title:
  Fails to read files in /etc/network/interfaces.d/

Status in “ifupdown” package in Ubuntu:
  New

Bug description:
  0.7.44ubuntu3 on Saucy 13.10 amd64.

  On a multi-homed server with five ethernet interfaces we have 6
  'interfaces' files in '/etc/network/interfaces.d/' for 'lo' and 'eth0'
  through 'eth4'.

  ifup -a fails to include the contents of these files and consequently
  the interfaces are ignored.

  
  "strace" reveals that when scanning the 'interfaces.d' directory ifupdown is using the "openat()" function which does an integral change-directory. It gets the list of files correctly and "closes()" the directory. It then does "open()" on each validly named file but gets  -ENOENT result because it forgets to prefix the file-name with the 'interfaces.d/' directory - so it is looking in '/etc/network/' rather than '/etc/network/interfaces.d/'.

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