emerge-webrsync replacer

#!/bin/bash

TARGET=/usr/portage
TMP_TARGET=${TARGET}_tmp
FILENAME=/usr/portage.sqfs
PORTAGE_USER_GROUP='portage:portage'
USE_TMPFS=1
TMPFS_OPT='size=2G,nr_inodes=500k,mode=0700'
SQUASHFS_OPT='-force-uid portage -force-gid portage -no-duplicates -b 65536'

RED='\e[1;31m'
NC='\e[0m'
MOUNTED=0
TMPFS_MOUNTED=0

function redexit {
    echo -e "${RED}${1}${NC}"
    exit
}

function quit {
    if [ $MOUNTED == 1 ]
    then
        if [ umount $TMP_TARGET ]
        then
            rm -rf $TMP_TARGET
        else
            echo -e "${RED}Failed to unmount $FILENAME on ${TMP_TARGET}${NC}"
        fi
    fi
    if [ $TMPFS_MOUNTED == 1 ]
    then
        umount $TARGET || echo -e "${RED}Failed to unmount tmpfs on ${TARGET}${NC}"
    fi
    exit
}

# Unmount 1st.
for NAME in $TARGET $TARGET $TARGET $TMP_TARGET $TMP_TARGET $TMP_TARGET
do
    if mount | grep -q " on $NAME type"
    then
        echo -e "Unmouting $NAME"
        umount $NAME || redexit "Failed to unmount $FILENAME on $NAME"
    fi
done




[ -d $TMP_TARGET ] && rm -rf $TMP_TARGET
# if we have .sqfs - use it
if [ -f $FILENAME ]
then
    mkdir $TMP_TARGET
    chown $PORTAGE_USER_GROUP $TMP_TARGET
    echo -e "$FILENAME found, remount..."
    mount -t squashfs -o loop,ro $FILENAME $TMP_TARGET || redexit "Failed to mount $FILENAME on ${TMP_TARGET}"
    MOUNTED=1
fi

[ -d $TARGET ] && rm -rf $TARGET
mkdir $TARGET
chown $PORTAGE_USER_GROUP $TARGET

if [ $USE_TMPFS == "1" ] && [ $MOUNTED == "1" ]
then
    echo -e "Mounting TMPFS...";
    mount -t tmpfs -o $TMPFS_OPT tmpfs $TARGET || redexit "Failed to mount tmpfs on ${TARGET}"
    cp $TMP_TARGET/* $TARGET -a
    TMPFS_MOUNTED=1
fi

if [ $MOUNTED == "1" ]
then
    umount $TMP_TARGET || quit
    rm -rf $TMP_TARGET
    MOUNTED=0
fi

[ -f ${TARGET}/metadata/timestamp.x ] && rm $TARGET/metadata/timestamp.x
/usr/lib/portage/bin/emerge-webrsync

# Building squashfs
[ -f $FILENAME ] && rm $FILENAME;

mksquashfs $TARGET $FILENAME $SQUASHFS_OPT || redexit "Making $TARGET fails"

if [ $TMPFS_MOUNTED == 1 ]
then
    umount $TARGET || redexit "Failed to unmount tmpfs on ${TARGET}"
fi

mount -t squashfs -o loop,ro $FILENAME $TARGET || redexit "Failed to mount $FILENAME on ${TARGET}"
rm /var/tmp/portage/* -rf
echo "All done"