[Bug 1669420] [NEW] udevadm unconfigured script leaks into initrd causing boot failure

[C Filorux]

Public bug reported:

If update-initramfs is run while udevadm is "unconfigured", then the
system is rendered unbootable.  Instead of containing a working version
of udevadm, the "initrd" is built with the wrapper script that reports
an error, and proceeds no further (as per code below).

Please incorporate the check for 'unconfigured' into the code for
udevadm, so that the udevadm binary can work correctly whether it is on
an unconfigured system, or an initrd.

This was a sticky problem, because no amount of 'dpkg-reconfigure udev'
did the required 'mv udevadm.upgrade udevadm'

#!/bin/sh

if [ "$1" = "trigger" ]; then
    echo "udevadm trigger is not permitted while udev is unconfigured." 1>&2
    exit 1
fi
# ... snip ...
exec /bin/bash -c "exec -a \"\$0\" /bin/udevadm.upgrade \"\$@\"" "$0" "$@"

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

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https://bugs.launchpad.net/bugs/1669420

Title:
  udevadm unconfigured script leaks into initrd causing boot failure

Status in udev package in Ubuntu:
  New

Bug description:
  If update-initramfs is run while udevadm is "unconfigured", then the
  system is rendered unbootable.  Instead of containing a working
  version of udevadm, the "initrd" is built with the wrapper script that
  reports an error, and proceeds no further (as per code below).

  Please incorporate the check for 'unconfigured' into the code for
  udevadm, so that the udevadm binary can work correctly whether it is
  on an unconfigured system, or an initrd.

  This was a sticky problem, because no amount of 'dpkg-reconfigure
  udev' did the required 'mv udevadm.upgrade udevadm'

  #!/bin/sh

  if [ "$1" = "trigger" ]; then
      echo "udevadm trigger is not permitted while udev is unconfigured." 1>&2
      exit 1
  fi
  # ... snip ...
  exec /bin/bash -c "exec -a \"\$0\" /bin/udevadm.upgrade \"\$@\"" "$0" "$@"

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