Set SHELL since the generic jabber user used on Gentoo for jabber servers
doesn't have a valid shell set by default and fix EXEC_CMD otherwise it fails
with "This account is currently not available" again due to jabber not having
a valid shell.

Also, workaround the assumption that jabber's $HOME is a directory when instead
it defaults to /dev/null on Gentoo.

--- ejabberd-15.03/ejabberdctl.template
+++ ejabberd-15.03/ejabberdctl.template
@@ -15,6 +15,7 @@
 IEX={{bindir}}/iex
 EPMD={{bindir}}/epmd
 INSTALLUSER={{installuser}}
+SHELL=/bin/sh
 
 # Compatibility in ZSH
 #setopt shwordsplit 2>/dev/null
@@ -25,11 +26,11 @@
     for GID in `id -G`; do
         if [ $GID -eq 0 ] ; then
             INSTALLUSER_HOME=$(getent passwd "$INSTALLUSER" | cut -d: -f6)
-            if [ -n "$INSTALLUSER_HOME" ] && [ ! -d "$INSTALLUSER_HOME" ] ; then
+            if [ -n "$INSTALLUSER_HOME" ] && [ ! -e "$INSTALLUSER_HOME" ] ; then
                 mkdir -p "$INSTALLUSER_HOME"
                 chown "$INSTALLUSER" "$INSTALLUSER_HOME"
             fi
-            EXEC_CMD="su $INSTALLUSER -c"
+            EXEC_CMD="su $INSTALLUSER -p -c"
         fi
     done
     if [ `id -g` -eq `id -g $INSTALLUSER` ] ; then
@@ -111,6 +112,7 @@
 DATETIME=`date "+%Y%m%d-%H%M%S"`
 ERL_CRASH_DUMP=$LOGS_DIR/erl_crash_$DATETIME.dump
 ERL_INETRC=$ETC_DIR/inetrc
+HOME=$SPOOL_DIR
 
 # define erl parameters
 ERL_OPTIONS=$(echo $ERL_OPTIONS | sed 's/ /\\ /g')
@@ -167,6 +169,8 @@
 export ERL_INETRC
 export ERL_MAX_PORTS
 export ERL_MAX_ETS_TABLES
+export HOME
+export SHELL
 
 # start server
 start()