Package diff : cdimage package list vs Debian snapshot repository

pkgdiff.sh

#!/bin/bash
TIMESTAMP=$1
SCORE=0
mkdir -p tmp
rm -rf tmp/*

echo Fetching snapshot $1 / main ...
wget -O tmp/main-packages.gz http://snapshot.debian.org/archive/debian/$1/dists/sid/main/binary-amd64/Packages.gz
gunzip -c tmp/main-packages.gz > tmp/main-packages.txt
rm -rf tmp/main-packages.gz

echo Fetching snapshot $1 / contrib ...
wget -O tmp/contrib-packages.gz http://snapshot.debian.org/archive/debian/$1/dists/sid/contrib/binary-amd64/Packages.gz
gunzip -c tmp/contrib-packages.gz > tmp/contrib-packages.txt
rm -rf tmp/contrib-packages.gz

echo Fetching snapshot $1 / non-free ...
wget -O tmp/non-free-packages.gz http://snapshot.debian.org/archive/debian/$1/dists/sid/non-free/binary-amd64/Packages.gz
gunzip -c tmp/non-free-packages.gz > tmp/non-free-packages.txt
rm -rf tmp/non-free-packages.gz

cat tmp/main-packages.txt tmp/contrib-packages.txt tmp/non-free-packages.txt | sed -n -e '/Package:\|Version:/p' | sed ':a;N;$!ba;s/\nVersion://g' | sed 's/Package: //g' > tmp/all-packages.txt

if [ "$(wc -l tmp/all-packages.txt | cut -d' ' -f1)" -lt 1 ];then
  echo "Packages log is empty. Please try another timestamp."
  exit 1;
fi
while read str; do
    read -ra arr <<< "$str"
    #arr=($str)
    PKG=${arr[0]}
    TAMBORA_VER=${arr[1]}
    SID_PKG=$(cat tmp/all-packages.txt | grep "^$PKG " | cut -d' ' -f1)
    SID_VER=$(cat tmp/all-packages.txt | grep "^$PKG " | cut -d' ' -f2)
    echo -n "compare for $PKG $TAMBORA_VER vs $SID_PKG $SID_VER"
    if [ "x$SID_PKG" == "x$PKG" ];then
        if [ "x$SID_VER" == "x$TAMBORA_VER" ];then
            SCORE=$((SCORE+1))
            echo " MATCHED"
        else
            echo " MEH"
        fi
    fi
done <$2
rm -rf *-$1.result
touch $SCORE-$1.result
echo ""
echo "Score : $SCORE of $(wc -l $2 | cut -d' ' -f1)"
exit 0