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Let check_drupal_log read from stdin #13

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Let check_drupal_log read from stdin #13

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831bd05
Let check_drupal_log read from stdin
waoki Dec 29, 2016
61f229f
Document use of '-' to read from stdin
waoki Feb 2, 2017
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64 changes: 52 additions & 12 deletions bin/check_drupal_log
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Original file line number Diff line number Diff line change
Expand Up @@ -26,6 +26,8 @@ EXIT_OK=0
#EXIT_ERR=2
EXIT_UNKNOWN=3

# Need special behavior when reading from stdin
READING_STDIN=


################################################################################
Expand Down Expand Up @@ -62,6 +64,7 @@ print_version() {
# @return integer 0
print_usage() {
printf "Usage: %s -f <logfile>\n" "${INFO_NAME}"
printf "OR %s -f -\n" "${INFO_NAME}"
printf "OR %s --help\n" "${INFO_NAME}"
printf "OR %s --version\n\n" "${INFO_NAME}"
return 0
Expand All @@ -78,7 +81,8 @@ print_help() {
# Show help and details
printf "Nagios plugin that will parse the logfile created by 'check_drupal'.\n\n"

printf " -f <logfile> The full path to logfile created by 'check_drupal'\n\n"
printf " -f <logfile> The full path to logfile created by 'check_drupal'\n"
printf " Specify '-' to read from standard input\n\n"

printf " --help Show this help\n"
printf " --version Show version information.\n"
Expand Down Expand Up @@ -138,28 +142,60 @@ if [ -z "$LOGFILE" ]; then
exit $EXIT_UNKNOWN
fi

# Check if logfile exists
if [ ! -f "$LOGFILE" ]; then
echo "[UNKNOWN] Logfile does not exist: ${LOGFILE}."
exit $EXIT_UNKNOWN
fi

# Check if logfile is readable
if [ ! -r "$LOGFILE" ]; then
echo "[UNKNOWN] Logfile is not readable: ${LOGFILE}."
exit $EXIT_UNKNOWN
# Check if logfile is stdin
if [ "$LOGFILE" = "-" ]; then
READING_STDIN=1

# Generate random tmpfile
if ! command -v mktemp >/dev/null 2>&1; then
_rand="$(LC_ALL=C tr -dc 'a-z0-9' < /dev/urandom | head -c 32)"
LOGFILE="/tmp/.drushrc.${_rand}"
touch "${LOGFILE}"
_ret=$?
else
LOGFILE="$(mktemp)"
_ret=$?
fi

# Quit on error immediately
if [ ${_ret} -ne 0 ]; then
echo "[UNKNOWN] Can't create temporary file"
return $EXIT_UNKNOWN
fi

cat > "$LOGFILE"
else
# Check if logfile exists
if [ ! -f "$LOGFILE" ]; then
echo "[UNKNOWN] Logfile does not exist: ${LOGFILE}."
exit $EXIT_UNKNOWN
fi

# Check if logfile is readable
if [ ! -r "$LOGFILE" ]; then
echo "[UNKNOWN] Logfile is not readable: ${LOGFILE}."
exit $EXIT_UNKNOWN
fi
fi

# Check if last line contains error code
NAGIOS_EXIT="$(tail -n1 "$LOGFILE")"
if ! isint "${NAGIOS_EXIT}" > /dev/null 2>&1 ; then
if [ -n "$READING_STDIN" ]; then
rm -f "$LOGFILE"
fi
echo "[UNKNOWN] Logfile seems invalid: Does not contain exit code on last line."
exit $EXIT_UNKNOWN
fi

# Check if exit code is within bounds
if [ "$NAGIOS_EXIT" != "0" ] && [ "$NAGIOS_EXIT" != "1" ] && [ "$NAGIOS_EXIT" != "2" ] && [ "$NAGIOS_EXIT" != "3" ]; then
echo "[UNKNOWN] Exit code not within bounds in $LOGFILE"
if [ -n "$READING_STDIN" ]; then
rm -f "$LOGFILE"
echo "[UNKNOWN] Exit code not within bounds on stdin"
else
echo "[UNKNOWN] Exit code not within bounds in $LOGFILE"
fi
exit $EXIT_UNKNOWN
fi

Expand All @@ -170,6 +206,10 @@ NUM_LINES="$((NUM_LINES-1))" # Last line is exit code

OUTPUT="$(head -n${NUM_LINES} "$LOGFILE")"

if [ -n "$READING_STDIN" ]; then
rm -f "$LOGFILE"
fi

echo "$OUTPUT"
exit "$NAGIOS_EXIT"

Expand Down