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This bug was fixed in the package drbd-utils - 8.9.10-2ubuntu1

---------------
drbd-utils (8.9.10-2ubuntu1) cosmic; urgency=medium

  * Fix creation of drbd symlinks with newer udev.
    (LP: #1673255)

 -- Dan Streetman <ddstreet@xxxxxxxxxxxxx>  Fri, 25 May 2018 11:17:50
-0400

** Changed in: drbd-utils (Ubuntu Cosmic)
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1673255

Title:
  drbd udev rule with multiple symlinks fails

Status in drbd-utils package in Ubuntu:
  Fix Released
Status in drbd-utils source package in Trusty:
  Invalid
Status in drbd-utils source package in Xenial:
  In Progress
Status in drbd-utils source package in Artful:
  In Progress
Status in drbd-utils source package in Bionic:
  In Progress
Status in drbd-utils source package in Cosmic:
  Fix Released
Status in drbd-utils package in Debian:
  New

Bug description:
  The drbd udev rule creates multiple symlinks with a single udev rule, by space-separating them inside an env var.  However, recent udev changes no longer allow doing that:
  https://github.com/systemd/systemd/issues/4833

  Now, recent versions of udev will, by default, replace any whitespace
  introduced into SYMLINK values by variable substitution, so the drbd
  udev rule that does this breaks:

  ENV{SYMLINK}!="", SYMLINK="$env{SYMLINK}", GOTO="have_symlink"

  when that SYMLINK env variable contains multiple symlinks, they are
  combined into a single symlink with an underscore joining them.
  Instead, since it's desired to leave all spaces in the env var in
  order to create multiple symlinks, the rule needs to use the
  "string_escape=none" option which prevents whitespace replacement:

  ENV{SYMLINK}!="", SYMLINK="$env{SYMLINK}",
  OPTIONS+="string_escape=none", GOTO="have_symlink"

  
  Related ubuntu bug that introduced the new udev default whitespace replacement behavior:
  https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1647485

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