download accelerated ISO download

[ghat]

hi


I happened to write a script, so I want to share it...if anyone is interested....



$#> cat get-ubuntu-iso
#!/bin/bash
starttime=$(date +%s)
mirror1=http://mirror.mcs.anl.gov/pub/ubuntu-iso/CDs
mirror2=http://mirrors.kernel.org/ubuntu-releases
mirror3=http://mirror.pnl.gov/releases
mirror4=http://mirrors.easynews.com/linux/ubuntu-releases

isolocation=$1
isofile=$(basename $isolocation)
targetmd5sum=$(wget -q -O - http://us.releases.ubuntu.com/10.10/MD5SUMS | grep $isofile| awk '{print $1}')
fileprefix=.tmp-$$

( /usr/bin/curl -s --range 0-199999999 -o ${fileprefix}-${isofile}-part1 ${mirror1}/${isolocation} ; md5sum ${fileprefix}-${isofile}-part1 > ${fileprefix}-${isofile}-part1.done )&
( /usr/bin/curl -s --range 200000000-399999999 -o ${fileprefix}-${isofile}-part2 ${mirror2}/${isolocation} ; md5sum ${fileprefix}-${isofile}-part2 > ${fileprefix}-${isofile}-part2.done )&
( /usr/bin/curl -s --range 400000000-599999999 -o ${fileprefix}-${isofile}-part3 ${mirror3}/${isolocation} ; md5sum ${fileprefix}-${isofile}-part3 > ${fileprefix}-${isofile}-part3.done )&
( /usr/bin/curl -s --range 600000000- -o ${fileprefix}-${isofile}-part4 ${mirror4}/${isolocation} ; md5sum ${fileprefix}-${isofile}-part4 > ${fileprefix}-${isofile}-part4.done )&

until test -s ${fileprefix}-${isofile}-part1.done -a -s ${fileprefix}-${isofile}-part2.done -a -s ${fileprefix}-${isofile}-part3.done -a -s ${fileprefix}-${isofile}-part4.done ;
do
sleep 10
echo " "
date
ls -l ${fileprefix}-${isofile}-part* ;
runtime=$(expr $(date +%s) - $starttime )
csum=$(\ls -l ${fileprefix}-${isofile}-part? | awk 'BEGIN{s=0}{s+=$5}END{print s}' )
echo Cumulative/Average download speed $(expr $(expr $csum / $runtime) / 1024) KB/s
done

if test -s ${fileprefix}-${isofile}-part1.done -a -s ${fileprefix}-${isofile}-part2.done -a -s ${fileprefix}-${isofile}-part3.done -a -s ${fileprefix}-${isofile}-part4.done ; then
cat ${fileprefix}-${isofile}-part1 ${fileprefix}-${isofile}-part2 ${fileprefix}-${isofile}-part3 ${fileprefix}-${isofile}-part4 > $isofile ;
fi

finalmd5sum=$(md5sum $isofile| awk '{print $1}')
if test "$targetmd5sum" = "$finalmd5sum" ; then
echo "Download succeeded"
ls -l $isofile
echo md5sum $finalmd5sum ;
rm -f ${fileprefix}-${isofile}-part1 ${fileprefix}-${isofile}-part2 ${fileprefix}-${isofile}-part3 ${fileprefix}-${isofile}-part4 \
${fileprefix}-${isofile}-part1.done ${fileprefix}-${isofile}-part2.done ${fileprefix}-${isofile}-part3.done ${fileprefix}-${isofile}-part4.done
else
echo "md5 mismatch"
echo expected $targetmd5sum
echo found $finalmd5sum ;
fi
Usage would be...


get-ubuntu-iso 10.10/ubuntu-10.10-desktop-amd64.iso

[aNDoz]

have you tested this?

[ghat]

have you tested this?
yes.. just downloaded a file... and the md5sum matched also...