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[Alkis Georgopoulos <1492546@xxxxxxxxxxxxxxxxxx>]

This also affects LTSP, e.g. Wily clients can't shutdown because
/sbin/poweroff is no longer accessible once ifup@.service unmounts
/dev/nbd0.

If systemd is fixed in Ubuntu before 15.10 is released, problem solved,
otherwise we'll need to commit the following in upstream LTSP.

Script /usr/share/ltsp/init-ltsp.d/50-systemd-ifup:

if [ -f /lib/systemd/system/ifup@.service ]; then
    mkdir -p /etc/systemd/system/ifup@$DEVICE.service.d
    cat > /etc/systemd/system/ifup@$DEVICE.service.d/ltsp.conf <<EOF
[Service]
ExecStop=
EOF
fi

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https://bugs.launchpad.net/bugs/1492546

Title:
  Systemd runs ifdown on shutdown even when it shouldn't

Status in ltsp package in Ubuntu:
  New
Status in systemd package in Ubuntu:
  New

Bug description:
  The unit /lib/systemd/system/ifup@.service is Debian and Ubuntu specific, it's not part of upstream systemd.
  On shutdown, it unconditionally ifdowns all interfaces:
    ExecStop=/sbin/ifdown %I

  This is a regression from previous init systems (sysvinit and upstart)
  which cared so that when a network file system was in use, they didn't
  ifdown the interfaces.

  Specifically, both /etc/init.d/networking and /etc/init/networking contain these functions:
    check_network_file_systems()
    check_network_swaps()
  which output the message "not deconfiguring network interfaces: network file systems still mounted" and exit.

  So, please call the same functions in the ExecStop= part of
  ifup@.service.

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