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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

** Affects: drbd-utils (Ubuntu)
     Importance: Undecided
     Assignee: Dan Streetman (ddstreet)
         Status: In Progress

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drbd udev rule with multiple symlinks fails
https://bugs.launchpad.net/bugs/1673255
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