#!/bin/sh (source)

#
# Functions to handle Resources/Requirements
#
# File syntax:
#
# required_groups=(
#    "groupname [gid=<num>]"
#    ...
# )
#
# required_users=(
#    "username [home=<homedir>] [groups=<groups>] [uid=<num>]"
#    ...
# )
#
# When supplied, <num> must be in the range 1..99
#

function Process_Requirements_File() {
   local reqfile="$1/Resources/Requirements"
   local nover="${1%/*}"
   local nopkg="${1%/*/*}"
   local package=`echo "$1" | sed "s,$nopkg/\(.*\)/.*,\1,g"`
   local version=`echo "$1" | sed "s,$nover/\(.*\),\1,g"`

   # We only allow hardcoded uid/gid's in the range [1..99]. These are reserved for
   # GoboLinux usage, as in scripts or daemons. All other uid/gid's should be generated
   # dynamically through get_next_system_id().
   function check_id_range() {
      id="$1"
      idtype="$2"
      name="$3"
      [ "$idtype" = "uid" ] && idtarget="user account" || idtarget="group"
      if [ $id -lt 1 -o $id -gt 99 ]
      then
         Log_Error "$idtype $id is out of range [1..99], will not create $idtarget '$name'"
         return 1
      fi
      return 0
   }
   # Ensures that only uid/gid's in the range [100..999] are created. Numbers below
   # that are reserved for GoboLinux usage, and the ones above are attributed to user
   # accounts only (user accounts should not be created using Resources/Requirements).
   function get_next_system_id() {
      unset next
      # search sequentially
      for num in `cat "$1" | cut -d: -f3 | sort -n`
      do
         [ $num -ge 100 -a $num -lt 999 ] && let next=num+1
      done
      if [ "$next" ] && ! cat "$1" | cut -d: -f3 | grep "^$next$"
      then
         echo "$next"
         return
      fi
      # get the first available slot
      for num in `seq 100 999`
      do
         if ! cat "$1" | cut -d: -f3 | grep -q "^$num$"
         then
            echo "$num"
            return
         fi
      done
   }
   if [ -f "$reqfile" ]
   then
      source "$reqfile"
      for entry in "${required_groups[@]}"
      do
         group=`echo "$entry" | cut -d" " -f1`
         grep -q "^$group:" $goboSettings/group && continue
         
         if echo "$entry" | grep -q "gid="
         then 
            gid="`echo $entry | sed 's,.*gid=\([^ ]*\).*,\1,g'`"
            check_id_range $gid "gid" "$group" || { unset gid; continue; }
         else
            gid="`get_next_system_id $goboSettings/group`"
            [ ! "$gid" ] && { Log_Error "Could not add group $group: no free slots"; continue; }
         fi
         if [ "$gid" ]
         then
            Log_Normal "Adding group $group..."
            $sudo_exec groupadd --gid $gid $group
            grep -q "^$group:" $goboSettings/group || Log_Error "Error adding group $group."
         fi
      done

      for entry in "${required_users[@]}"
      do
         user=`echo "$entry" | cut -d" " -f1`
         grep -q "^$user:" $goboSettings/passwd && continue
         
         if echo "$entry" | grep -q "home="
         then homedir="`echo $entry | sed 's,.*home=\([^ ]*\).*,\1,g'`"
         else homedir="$goboVariable/empty"
         fi
         if echo "$entry" | grep -q "groups="
         then groups="`echo $entry | sed 's,.*groups=\([^ ]*\).*,\1,g'`"
         else unset groups
         fi
         if echo "$entry" | grep -q "uid="
         then 
            uid="`echo $entry | sed 's,.*uid=\([^ ]*\).*,\1,g'`"
            check_id_range $uid "uid" "$user" || continue
         else
            uid="`get_next_system_id $goboSettings/passwd`"
            [ ! "$uid" ] && { Log_Error "Could not add user $user: no free slots"; continue; }
         fi
         grep -q "$user" "${goboSettings}/group" && maingroup="${user}"
         Log_Normal "Adding user $user..."
         [ -d "$homedir" ] && createhomedir= || createhomedir="-m"
         useraddmsg=$($sudo_exec useradd --uid $uid -c "Added by $package $version" $createhomedir -d "$homedir" -s "$goboExecutables/nologin" ${maingroup:+-g "${maingroup}"} $user 2>&1)
         [ "$groups" ] && $sudo_exec usermod -a -G "$groups" "$user"
         grep -q "^$user:" $goboSettings/passwd || {
	    Log_Error "Error adding user $user"
	    Log_Verbose "Reason: ${useraddmsg}"
	 }
      done
   fi
}