serv: add all initial detection, use bash directly

bin/serv

-#!/bin/sh
+#!/bin/bash
 #
-# Copyright (C) 2012-2013, 2016, 2020, 2021  Etersoft
-# Copyright (C) 2012-2013, 2016, 2020, 2021  Vitaly Lipatov <lav@etersoft.ru>
+# Copyright (C) 2012-2013, 2016, 2020, 2021, 2023  Etersoft
+# Copyright (C) 2012-2013, 2016, 2020, 2021, 2023  Vitaly Lipatov <lav@etersoft.ru>
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Affero General Public License as published by
@@ -17,11 +17,34 @@
 # along with this program. If not, see <http://www.gnu.org/licenses/>.
 #
 
-PROGDIR=$(dirname $0)
-[ "$PROGDIR" = "." ] && PROGDIR=$(pwd)
+PROGDIR=$(dirname "$0")
+PROGNAME=$(basename "$0")
+[ -n "$EPMCURDIR" ] || export EPMCURDIR="$(pwd)"
+CMDSHELL="/bin/bash"
+# TODO: pwd for ./epm and which for epm
+[ "$PROGDIR" = "." ] && PROGDIR="$EPMCURDIR"
+if [ "$0" = "/dev/stdin" ] || [ "$0" = "sh" ] ; then
+    PROGDIR=""
+    PROGNAME=""
+fi
+
+# will replaced with /usr/share/eepm during install
+SHAREDIR=$PROGDIR
+# will replaced with /etc/eepm during install
+CONFIGDIR=$PROGDIR/../etc
+
+EPMVERSION="@VERSION@"
+
+# package, single (file), pipe, git
+EPMMODE="package"
+[ "$SHAREDIR" = "$PROGDIR" ] && EPMMODE="single"
+[ "$EPMVERSION" = "@""VERSION""@" ] && EPMMODE="git"
+[ "$PROGNAME" = "" ] && EPMMODE="pipe"
+
+if [ "$EPMMODE" = "git" ] ; then
+    EPMVERSION=$(head $PROGDIR/../eepm.spec | grep "^Version: " | sed -e 's|Version: ||' )
+fi
 
-# will replaced to /usr/share/eepm during install
-SHAREDIR=$(dirname $0)
 
 load_helper()
 {
@@ -98,9 +121,9 @@ print_version()
         local on_text="(host system)"
         local virt="$($DISTRVENDOR -i)"
         [ "$virt" = "(unknown)" ] || [ "$virt" = "(host system)" ] || on_text="(under $virt)"
-        echo "Service manager version @VERSION@  https://wiki.etersoft.ru/Epm"
+        echo "Service manager version $EPMVERSION  https://wiki.etersoft.ru/Epm"
         echo "Running on $($DISTRVENDOR -e) $on_text with $SERVICETYPE"
-        echo "Copyright (c) Etersoft 2012-2021"
+        echo "Copyright (c) Etersoft 2012-2023"
         echo "This program may be freely redistributed under the terms of the GNU AGPLv3."
 }