utils/parse_directives

   1 #!/bin/sh
   2
   3 # Parse directive names out of Nagios' xdata/xodtemplate.c.
   4
   5 EXIT_USAGE=1
   6 EXIT_INPUT_FILE_DOESNT_EXIST=2
   7
   8 posix_mktemp(){
   9   # Securely create a temporary file under ${TMPDIR} using the
  10   # template "tmpXXXXXX", and echo the result to stdout. This works
  11   # around the absence of "mktemp" in the POSIX standard.
  12   printf 'mkstemp(template)' | m4 -D template="${TMPDIR:-/tmp}/tmpXXXXXX"
  13 }
  14
  15 if [ $# -lt 1 ]; then
  16     echo "Usage: $0 <path-to-xodtemplate.c>"
  17     exit $EXIT_USAGE
  18 fi
  19
  20
  21 INFILE="${1}"
  22 TEMPFILE="$(posix_mktemp)"
  23
  24 if [ ! -f "$INFILE" ]; then
  25     echo "Error: input file $INFILE doesn't exist."
  26     exit $EXIT_INPUT_FILE_DOESNT_EXIST
  27 fi
  28
  29 # The list of weekday names, taken from xdata/xodtemplate.c. The
  30 # Nagios strcmp parser doesn't look for them individually. Since
  31 # they're unlikely to change, appending them manually sounds
  32 # reasonable to me.
  33 printf '"sunday"
  34 "monday"
  35 "tuesday"
  36 "wednesday"
  37 "thursday"
  38 "friday"
  39 "saturday"
  40 ' >> "${TEMPFILE}"
  41
  42 # This grabs all of the variable names that are explicitly checked for
  43 # with strcmp in xdata/xodtemplate.c. We include these because some
  44 # valid variable names (e.g. "hostgroups") are implicitly mapped to
  45 # "real" variables whose names differ.
  46 #
  47 # The "name", "register", and "use" directives are special (literally,
  48 # they get the "special" font in nagios-mode.el), so we drop them from
  49 # the list.
  50 #
  51 # Before we parse the names, though, we move each !strcmp to its own
  52 # line, which greatly simplifies the parsing.
  53 VARCMP_REGEX='.*!strcmp(variable,[[:space:]]*"\([A-Za-z_]\{1,\}\)").*'
  54 sed "s/\!strcmp(/\n\!strcmp(/g" < "${INFILE}" \
  55   | sed -n "s/${VARCMP_REGEX}/\"\1\"/p"       \
  56   | sed '/^"name\|use\|register"$/d'          \
  57   >> "${TEMPFILE}"
  58
  59 # Finally, sort the list and print it.
  60 sort < "${TEMPFILE}" | uniq
  61
  62 # ... and clean up
  63 rm "${TEMPFILE}"