[Bug 1618471] [NEW] udev: init script unconditionally writes to /sys/kernel/uevent_helper

[Torsten Krah]

Public bug reported:

The udev initramfs-tools script from trusty lts:

/usr/share/initramfs-tools/scripts/init-top/udev

does not check if uevent_helper does exist and fails to boot if it is
missing - which it is in recent kernels (e.g. 4.7.2 from the mainline
ppa or modern self build kernels where it is disabled per default
afaik).

See e.g.: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=756312

Its fixed in xenials version (latest LTS) but fails in current supported LTS trusty to boot.
Please backport those simple fix:

if [ -w /sys/kernel/uevent_helper ]; then
	echo > /sys/kernel/uevent_helper
fi

and maybe add

udevadm settle || true

at the end to support kernels without uevent_helper enabled.

** Affects: udev (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: udev (Debian)
     Importance: Unknown
         Status: Unknown


** Tags: trusty

** Bug watch added: Debian Bug tracker #756312
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=756312

** Also affects: udev (Debian) via
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=756312
   Importance: Unknown
       Status: Unknown

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https://bugs.launchpad.net/bugs/1618471

Title:
  udev: init script unconditionally writes to /sys/kernel/uevent_helper

Status in udev package in Ubuntu:
  New
Status in udev package in Debian:
  Unknown

Bug description:
  The udev initramfs-tools script from trusty lts:

  /usr/share/initramfs-tools/scripts/init-top/udev

  does not check if uevent_helper does exist and fails to boot if it is
  missing - which it is in recent kernels (e.g. 4.7.2 from the mainline
  ppa or modern self build kernels where it is disabled per default
  afaik).

  See e.g.: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=756312

  Its fixed in xenials version (latest LTS) but fails in current supported LTS trusty to boot.
  Please backport those simple fix:

  if [ -w /sys/kernel/uevent_helper ]; then
  	echo > /sys/kernel/uevent_helper
  fi

  and maybe add

  udevadm settle || true

  at the end to support kernels without uevent_helper enabled.

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