# -*- mode: sh; sh-basic-offset: 3; indent-tabs-mode: nil; -*-

#####################################################
## VSERVERS RELATED FUNCTIONS FOR NINJAHELPER
##
## Depends on:
##    - easydialog library
##    - $conffile
##
## Global variables used and modified here:
##    - $vservers_are_available (yes/no)
##    - $found_vservers (list)
##    - $selected_vservers (list)
##    - $host_or_vservers (host/vservers/both)
##

##
## Get vservers-related variables.
## Then, if Vservers are enabled, check that:
##   - VROOTDIR is valid;
##   - at least one vserver can be found.
## If, and only if, the above conditions are all true:
##   - set $vservers_are_available to 'yes';
##   - set $found_vservers to the list of all vservers found on the system.
## This function has to be run once before a new helper is run.
## If the argument is "nodialog", use the backupninja's message functions
## instead of easydialog.
##
init_vservers() {
   local arg=$1
   # get global variables from the conffile
   setfile $conffile
   getconf vservers no
   getconf VSERVERINFO /usr/sbin/vserver-info
   getconf VSERVER /usr/sbin/vserver
   getconf VROOTDIR `if [ -x "$VSERVERINFO" ]; then $VSERVERINFO info SYSINFO | grep '^ *vserver-Rootdir' | awk '{print $2}'; fi`
   # canonicalize VROOTDIR
   [ -z "$VROOTDIR" ] || VROOTDIR=`readlink --canonicalize $VROOTDIR`
   # init this library's global variables
   vservers_are_available=no
   found_vservers=
   selected_vservers=
   host_or_vservers=host
   # check vservers real availability
   if [ $vservers = yes ]; then
      if [ ! -x "$VSERVERINFO" ]; then
         `if [ "$arg" = nodialog ]; then echo fatal; else echo "msgBox warning"; fi` \
            "vservers enabled in $conffile, but vserver-info command was not found. Please set the VSERVERINFO configuration variable to its full path."
            return
      fi
      if [ ! -x "$VSERVER" ]; then
         `if [ "$arg" = nodialog ]; then echo fatal; else echo "msgBox warning"; fi` \
            "vservers enabled in $conffile, but vserver command was not found. Please set the VSERVER configuration variable to its full path."
            return
      fi
      if [ -z "$VROOTDIR" ]; then
         `if [ "$arg" = nodialog ]; then echo fatal; else echo "msgBox warning"; fi` \
            "vservers enabled in $conffile, but VROOTDIR is not set and could not be guessed."
            return
      fi
      if [ ! -d "$VROOTDIR" ]; then
         `if [ "$arg" = nodialog ]; then echo fatal; else echo "msgBox warning"; fi` \
            "vservers enabled in $conffile, but VROOTDIR ($VROOTDIR) does not exist.";
            return
      fi
      found_vservers=`ls $VROOTDIR | grep -E -v "lost\+found|ARCHIVES" | tr "\n" " "`
      if [ -z "$found_vservers" ]; then
         `if [ "$arg" = nodialog ]; then echo warning; else echo "msgBox warning"; fi` \
            "vservers enabled in $conffile, but no vserver was found in $VROOTDIR.";      
            return
      fi
      vservers_are_available=yes
   fi
}

##
## If all the arguments are existing vservers names, returns 0.
## Else, returns 1. Also returns 1 if no argument is given.
##
vservers_exist() {
   [ $# -ge 1 ] || return 1
   local args="$1"
   local vserver i found
   for vserver in $args ; do
      found=no
      for i in $found_vservers ; do
         if [ $vserver = $i ]; then
            found=yes
            break
         fi
      done
      [ $found = yes ] || return 1
   done
   return 0
}

##
## If the argument is the name of a vserver selected by the current helper,
## echoes 'on' and returns 0.
## Else, echoes 'off' and returns 1.
##
vserver_is_selected() {
   local vserver=$1
   local vserver_is_selected=1
   local i
   for i in $selected_vservers ; do
      [ "$vserver" == "$i" ] && vserver_is_selected=0
   done
   if [ $vserver_is_selected = 0 ]; then
      echo on
   else
      echo off
   fi
   return $vserver_is_selected
}

##
## Have the user choose one Vserver among the existing ones.
## Set $selected_vservers to the chosen one's name.
## Returns 1 if cancelled or if Vservers are not available.
##
choose_one_vserver() {
   [ "$vservers_are_available" == "yes" ] || return 1
   local title=$1
   local i=
   local vserver=
   REPLY=
   while [ -z "$REPLY" ]; do
      [ -n "$selected_vservers" ] && setDefault $selected_vservers
      listBegin "$title" "Choose at least one Linux-Vserver to backup:"
            for vserver in $found_vservers; do
	       listItem "$vserver" "Backup $vserver vserver"
	    done
      listDisplay menu
      [ $? = 0 ] || return 1
   done
   selected_vservers=$REPLY
}

##
## If Vservers are not enabled, set host_or_vservers='host' and then return 
## Else, have the user choose if he/she wants to perform the backup on the host
## system or on one Vserver.
## Set, respectively, $host_or_vservers to 'host' or 'vservers'.
## Returns 1 if cancelled.
##
choose_host_or_one_vserver() {
   if [ "$vservers_are_available" != "yes" ] 
   then
       host_or_vservers='host'
       return
   fi
   local title=$1
   # if there is one, set the previously chosen item as the default
   [ -n "$host_or_vservers" ] && setDefault $host_or_vservers
   menuBox "$title - src" "Do you want to operate on the host system and/or on vservers?" \
      "host" "Host system" \
      "vserver" "One Vserver"
   [ $? = 0 ] || return 1
   case $REPLY in
      "host")
	 host_or_vservers='host'
	 ;;
      "vserver")
	 host_or_vservers='vservers'
	 ;;
   esac
}

##
## If Vservers are not enabled, set host_or_vservers='host' and then return
## Else, have the user choose the target he/she wants to perform the backup on:
##   - host system only;
##   - some vservers only;
##   - both the host system and some vservers.
## Set, respectively, $host_or_vservers to 'host', 'vservers', or 'both'
## Returns 1 if cancelled.
##
choose_host_or_vservers_or_both() {
   if [ "$vservers_are_available" != "yes" ] 
   then
       host_or_vservers='host'
       return
   fi
   local title=$1
   # if there is one, set the previously chosen item as the default
   [ -n "$host_or_vservers" ] && setDefault $host_or_vservers
   menuBox "$title - src" "Do you want to operate on the host system and/or on vservers?" \
      "host" "Host system only" \
      "vservers" "Vservers only" \
      "both" "Host system and Vservers"
   [ $? = 0 ] || return 1
   case $REPLY in
      "host")
	 host_or_vservers='host'
	 ;;
      "vservers")
	 host_or_vservers='vservers'
	 ;;
      "both")
	 host_or_vservers='both'
	 ;;
   esac
}

##
## Have the user choose among "all vservers" and a not-empty subset of these.
## Set $selected_vservers to 'all' or to a space-separated name list.
## Returns 1 if cancelled or if Vservers are not available.
##
choose_one_or_more_vservers() {
   [ "$vservers_are_available" == "yes" ] || return 1
   local title=$1
   local i=
   # UI
   booleanBox "$title" "Do you want to backup all vservers?" ` [ -z "$selected_vservers" -o "$selected_vservers" == "all" ] || echo no`
   if [ $? = 0 ]; then
      selected_vservers="all"
   else
      # choose among the existing vservers
      local vserver=
      local vserver_was_selected=
      REPLY=
      while [ -z "$REPLY" ]; do
	 listBegin "$title" "Choose at least one Linux-Vserver to backup:"
	    # list existing vservers, preselecting the previously selected ones
	    for vserver in $found_vservers; do
	       listItem "$vserver" "Backup $vserver vserver" `vserver_is_selected $vserver`
	    done
	 listDisplay checklist
	 [ $? = 0 ] || return 1
      done
      # remove quotes around each vserver name
      selected_vservers=`echo $REPLY | tr -d '"'`
   fi
}
