#!/bin/sh
#----------------------------------------------------------------------------
# /var/install/bin/config_shlib - 
#                      shell library for advanced configfile handling
#
# Copyright (c) 2001-2003 Ansgar Püster <Ansgar.Puester@T-Online.de>
#
# Creation:     24.12.2003  ap
# Last Update:  $Id$
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#----------------------------------------------------------------------------
#
# This library is used by
#
#    /var/install/bin/edit
#    /var/install/bin/template-backup-config and all it's links
#    /var/install/bin/template-restore-bconf and all it's links
#    /var/install/bin/template-restore-dconf and all it's links
#    /var/install/bin/master-diff-config     and all it's links
#

# include eislib
. /var/install/include/eislib


defaultd=/etc/default.d
configd=/etc/config.d
backupd=/etc/backup.d
fmask='*[0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9]-[0-9][0-9]-[0-9][0-9]-[0-9][0-9]'

#debug='true'
#trace='true'

gotoyx () { echo -e "\033[$1;$2H\c"; }

#
# check_backupdir
# ===============
#
# Parameters:      $1    name of backup directory
#
# Returns:         0     success
#                  1     failure
#
check_backupdir()
{
    dir=$1

    if [ ! -d $dir ]
    then
        mkdir $dir
        [ $? != 0 ] && return 1
        chmod og-rw $dir
        [ $? != 0 ] && return 1
    fi
    return 0
}

#
# check_config_files
# ==================
#
#  Parameters:     $1    package name
#
#  Returns:        0     success
#                  1     failure
#
check_config_files()
{
    [ "$debug" = 'true' ] && mecho "call check_config_files: $*"
    [ "$trace" = 'true' ] && set -x
    package=$1

    # count files
    fcount=`find $backupd -type f -maxdepth 1 -name "$package.$fmask" 2>/dev/null | wc -l`
    fcount=`echo $fcount`

    # verify environment variable MAX_BACKUP_CONFIG
    [ "$MAX_BACKUP_CONFIG" = '' ] && MAX_BACKUP_CONFIG=10

    # check number of files
    if [ "$fcount" -gt "$MAX_BACKUP_CONFIG" ]
    then
        # number of files to remove
        rmcount=`expr $fcount - $MAX_BACKUP_CONFIG`
        count=0
        # find files in sorted order
        for file in `find $backupd -type f -maxdepth 1 -name "$package.$fmask" | sort`
        do
            # remove obsolete files
            if [ "$count" -lt "$rmcount" ]
            then
                rm $file
                count=`expr $count + 1`
            else
                break
            fi
        done
        mecho -info "Backup directory contained $fcount files for package $package ($rmcount removed)."
    fi

  set +x
}

#
# backup_config
# =============
#
#  Parameters:     $1    package name
#                  $2    file to backup
#                  $3    individal backup suffix
#                  $4    'quiet' - disable screen output
#
#  Returns:        0     backup O.K.
#                  1     failure
#
backup_config()
{
    [ "$debug" = 'true' ] && mecho "call backup_config: $*"
    [ "$trace" = 'true' ] && set -x
    package=$1
    file=$2
    suffix=$3
    quiet=$4

    # check backup directory
    if ! check_backupdir $backupd
    then
        mecho -error "Error creating backup directory $backupd ..."
        return 1
    fi

    if [ "$suffix" = "" ]
    then
        # timestamp to add to filename
        stamp=`date +%Y-%m-%d-%H-%M-%S`
    else
        # individual suffix to add to filename
        stamp=$suffix
    fi

    # do the backup
    if [ -f $file ]
    then
        cp -p $file $backupd/$package.$stamp
        chmod og-rw $backupd/$package.$stamp

        if [ "$quiet" != "quiet" ]
        then
            mecho -info "Configuration file was saved as $package.$stamp in $backupd."
        fi
    else
        if [ "$quiet" != "quiet" ]
        then
            mecho -warn "File $file not found - no backup done"
        fi
    fi

    # check if files have to be deleted
    check_config_files $package

  set +x
}

activate_hint()
{
    mecho -info "Configuration file $configd/$package was overwritten."
    mecho -info "You have to activate the configuration in order to"
    mecho -info "let the changes take effect."
    mecho -info "For most packages an 'Edit Configuration' without any"
    mecho -info "changes followed by an answer 'yes' to the question"
    mecho -info "'Activate the new configuration now (y/n)?' will do"
    mecho -info "this job."
}

select_file()
{
    # count files
    fcount=`find $backupd -type f -maxdepth 1 -name "$package.$fmask" 2>/dev/null | wc -l`
    fcount=`echo $fcount`
    [ "$omit_file" != '' ] && fcount=`expr $fcount - 1`

    selected='false'

    act_count=1
    header

    if [ $fcount -gt 0 ]
    then
        row=4
        # find files in sorted order
        for file in `find $backupd -type f -maxdepth 1 -name "$package.$fmask" | sort`
        do
            [ "$file" = "$omit_file" ] && continue
            eval bfile[$act_count]=\$file
            gotoyx $row 3
            mecho $act_count
            gotoyx $row 8
            mecho $file

            selected='false'
          # if [ $row = 21 ]
            if [ $row = 13 ]
            then
                while [ $selected = 'false' ]
                do
                    gotoyx $row 1
                    question
                    fnumber=""
                    read fnumber
                    case $fnumber in
                        [0-9]*)
                            if [ $fnumber -gt $act_count -o $fnumber -le 0 ]
                            then
                                mecho -error "wrong number: $fnumber"
                            else
                                selected='true'
                            fi
                            ;;
                        Q|q)
                            selected='quit'
                            break
                            ;;
                        '')
                            header
                            row=4
                            break
                            ;;
                        *)
                            mecho -error "wrong value: $fnumber"
                            ;;
                    esac
                done
            fi
            if [ $selected != 'false' ]; then
                break
            fi
            row=`expr $row + 1`
            act_count=`expr $act_count + 1`
        done

        if [ $selected = 'false' ]; then
            if [ $row -gt 4 ]; then
                while [ $selected = 'false' ]
                do
                    gotoyx $row 1
                    question
                    fnumber=""
                    read fnumber
                    case $fnumber in
                        [0-9]*)
                            if [ $fnumber -ge $act_count -o $fnumber -le 0 ]; then
                                mecho -error "wrong number: $fnumber"
                            else
                                selected='true'
                            fi
                            ;;
                        Q|q)  break;;
                        '')  break;;
                        *)
                            mecho -error "wrong value: $fnumber"
                            ;;
                    esac
                done
            fi
        fi
    else
        if [ "$omit_file" = '' ]; then
            mecho -warn "No files for $package found in $backupd."
        else
            mecho -warn "Only one file for $package found in $backupd."
        fi
    fi
}