#!/bin/sh
#----------------------------------------------------------------------------
# /etc/rc.d/rc099.persistent
#
# Last Update:  $Id$
#
# Copyright (c) 2000-2002 - Frank Meyer
# Copyright (c) 2002-2016 - fli4l-Team <team@fli4l.de>
#----------------------------------------------------------------------------

begin_script RC099_PERSISTENT "setup of persistent storage..."

SAVEPATH=/var/lib/persistent

# Checks whether a path variable contains the string "auto".
# If so, it is set to $SAVEPATH/$OPT$2, where $OPT is deduced from
# the SCRIPT variable set by begin_script(). Otherwise, the variable
# is left unchanged.
#
# $1 = name of path variable
# $2 = relative path lying under the persistent storage for current OPT;
#      can be empty but must begin with a slash if not
#
# Example:
#  SCRIPT="VBOX", VBOX_SPOOLPATH="auto"
#  => map2persistent "VBOX_SPOOLPATH" "/spool" results in
#     VBOX_SPOOLPATH="$SAVEPATH/vbox/spool"
map2persistent()
{
    eval local val=\$$1
    if [ "$val" = "auto" ]
    then
        local pkg=$(echo $SCRIPT | tr 'A-Z' 'a-z')
        eval $1=\$SAVEPATH/\$pkg\$2
    fi
}

# will be set if persistent storage is found
PERSISTENTVOLUME=
PERSISTENTPATH=

# search for directory for persistent storage
if [ -n "$FLI4L_UUID" ]
then
    # extract all devices that are mounted read-write
    set -- $(sed -n "s#^\(/dev/[^ ]\+\) \([^ ]\+\) [^ ]\+ rw,.*#\1 \2#p" /proc/mounts)

    while [ -n "$1" -a -n "$2" ]
    do
        dir=$(find "$2" -type d -name $FLI4L_UUID)
        if [ -n "$dir" ]
        then
            PERSISTENTVOLUME=$1
            PERSISTENTPATH="$dir"
            break
        fi
        shift 2
    done
fi

if [ -z "$PERSISTENTPATH" ]
then
    boot_dev=$(sed -n "s#^\(/dev/[^ ]\+\) /boot [^ ]\+ rw,.*#\1#p" /proc/mounts)
    if [ -n "$boot_dev" ]
    then
        PERSISTENTVOLUME=$boot_dev
        PERSISTENTPATH=/boot/persistent
        mkdir -p "$PERSISTENTPATH"
    fi
fi

mkdir -p "$SAVEPATH"

if [ -d "$PERSISTENTPATH" ]
then
    log_info "using $PERSISTENTPATH on $PERSISTENTVOLUME for persistent storage"
    mount -o bind "$PERSISTENTPATH" "$SAVEPATH"
    echo "SAVETYPE=persistent" >/var/run/persistent.conf
else
    log_warn "Could not find a suitable directory for persistent storage!"
    log_warn "All persistent settings will be gone after the next reboot!"
    log_warn "Please create a directory named $FLI4L_UUID on some medium mounted read-write or unset FLI4L_UUID!"
    echo "SAVETYPE=transient" >/var/run/persistent.conf
fi

end_script