[Bug 1331814] Re: Warning messages for handlers are never called

[Hamilton Turner]

Also, I added a "reference" file for kickstart that lists all commands
with all command options. By doing

    $ ./test-kickseed tests/full-full-06-2014.ks

we can see which kickstart options are not currently supported, as they will print out "LOG" messages. It's 
not exactly test driven dev, but it's something ;-)

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https://bugs.launchpad.net/bugs/1331814

Title:
  Warning messages for handlers are never called

Status in “kickseed” package in Ubuntu:
  Fix Committed

Bug description:
  Multiple handlers use the following syntax:

       eval set -- "$(getopt -o '' -l interpreter: -- "$@")" || {
  warn_getopt %pre; return; }

  As mentioned in "/usr/share/doc/util-linux-ng-2.17.2/getopt-parse.bash", this will never
  call the warning:

      # We need TEMP as the `eval set --' would nuke the return value of getopt.
     TEMP=`getopt -o ab:c:: --long a-long,b-long:,c-long:: \
        -n 'example.bash' -- "$@"`

  Here is a simple example to prove this:

      #!/bin/sh
      trap 'echo ERROR happened' ERR
      echo begin
      eval set -- "$(false)"
      echo end

  Because of this, almost every bug report mentions something along the
  lines of "getopt printed an error". This is getout outputting to
  stderr, but the non-zero exit code is being swallowed and errexit is
  not happening.

  This coding was probably designed intentionally to disable automatic
  exit whenever getopt found an unexpected argument, due to the fact
  that this (currently) happens on almost every kickstart file as our
  syntax support is quite limited.

  However, it also hides the warning from the user, which I believe is
  the real bug. Moreover, the only error is printed briefly to a
  terminal and then never seen again, which makes it tough for people to
  put in bug reports.

  Perhaps a better solution would be to use set +x and set -e to
  temporarily disable errexit, and use a trap on ERR to ensure that
  these errors are caught and printed to both syslog and the current
  TTY.

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