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#!/bin/bash
#/**
#@file ogfunctions.sh
#@brief Generic functions for OpenGnsys Server and OpenGnsys Repository.
#@version 1.1.1 - Initial version
#@author Ramón M. Gómez, ETSII Universidad de Sevilla
#@date 2017-10-08
#*/
# Showing an error message.
function raiseError() {
case "$1" in
usage)
echo "$PROG: Usage error: Type \"$PROG help\"" >&2
exit 1 ;;
notfound)
echo "$PROG: Resource not found: $2" >&2
exit 2 ;;
access)
echo "$PROG: Access error: $2" >&2
exit 3 ;;
download)
echo "$PROG: Download error: $2" >&2
exit 4 ;;
cancel)
echo "$PROG: Operation cancelled: $2" >&2
exit 5 ;;
*)
echo "$PROG: Unknown error" >&2
exit 1 ;;
esac
}
# Showing help message.
function help() {
[ -n "$1" ] && DESCRIPTION="$1" || DESCRIPTION=$(grep "^#@brief" "$0" | cut -f2- -d" ")
shift
if [ -n "$1" ]; then
USAGE="$1"
shift
else
USAGE=$(grep "^#@usage" "$0" | cut -f2- -d" ")
[ -n "$USAGE" ] && PARAMS=$(awk '$1=="#@param" {sub($1,""); print "\t",$0}' "$0")
fi
# Showing help.
echo "$PROG: ${DESCRIPTION:-"no description"}"
echo "Usage: ${USAGE:-"no usage info"}"
[ -n "$PARAMS" ] && echo -e "$PARAMS"
if [ -n "$*" ]; then
echo "Examples:"
while (( "$#" )); do
echo -e "\t$1"
shift
done
fi
exit 0
}
# Functions to manage a service.
function restart() {
_service restart "$1"
}
function start() {
_service start "$1"
}
function stop() {
_service stop "$1"
}
### Meta-functions and private functions.
# Metafunction to check if JSON result exists.
JQ=$(which jq 2>/dev/null) || raiseError notfound "Need to install \"jq\"."
function jq() {
local OUTPUT
OUTPUT=$($JQ "$@") || return $?
[[ "$OUTPUT" = "null" ]] && return 1
echo "$OUTPUT"
}
# Private function to acts on a service (do not use directly).
function _service() {
local ACTION="$1"
local SERVICE="$2"
if which systemctl 2>/dev/null; then
systemctl "$ACTION" "$SERVICE"
elif which service 2>/dev/null; then
service "$SERVICE" "$ACTION"
elif [ -x /etc/init.d/"$SERVICE" ]; then
/etc/init.d/"$SERVICE" "$ACTION"
else
raiseError notfound "Service $SERVICE"
fi
}
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